1297 lines
56 KiB
C++
1297 lines
56 KiB
C++
/**
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* \file pk.h
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*
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* \brief Public Key abstraction layer
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*/
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/*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
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*/
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#ifndef MBEDTLS_PK_H
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#define MBEDTLS_PK_H
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#include "mbedtls/private_access.h"
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#include "mbedtls/build_info.h"
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#include "mbedtls/md.h"
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#if defined(MBEDTLS_RSA_C)
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#include "mbedtls/rsa.h"
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#endif
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#if defined(MBEDTLS_ECP_C)
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#include "mbedtls/ecp.h"
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#endif
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#if defined(MBEDTLS_ECDSA_C)
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#include "mbedtls/ecdsa.h"
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#endif
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#if defined(MBEDTLS_PSA_CRYPTO_CLIENT)
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#include "psa/crypto.h"
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#endif
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/** Memory allocation failed. */
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#define MBEDTLS_ERR_PK_ALLOC_FAILED -0x3F80
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/** Type mismatch, eg attempt to encrypt with an ECDSA key */
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#define MBEDTLS_ERR_PK_TYPE_MISMATCH -0x3F00
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/** Bad input parameters to function. */
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#define MBEDTLS_ERR_PK_BAD_INPUT_DATA -0x3E80
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/** Read/write of file failed. */
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#define MBEDTLS_ERR_PK_FILE_IO_ERROR -0x3E00
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/** Unsupported key version */
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#define MBEDTLS_ERR_PK_KEY_INVALID_VERSION -0x3D80
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/** Invalid key tag or value. */
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#define MBEDTLS_ERR_PK_KEY_INVALID_FORMAT -0x3D00
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/** Key algorithm is unsupported (only RSA and EC are supported). */
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#define MBEDTLS_ERR_PK_UNKNOWN_PK_ALG -0x3C80
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/** Private key password can't be empty. */
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#define MBEDTLS_ERR_PK_PASSWORD_REQUIRED -0x3C00
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/** Given private key password does not allow for correct decryption. */
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#define MBEDTLS_ERR_PK_PASSWORD_MISMATCH -0x3B80
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/** The pubkey tag or value is invalid (only RSA and EC are supported). */
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#define MBEDTLS_ERR_PK_INVALID_PUBKEY -0x3B00
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/** The algorithm tag or value is invalid. */
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#define MBEDTLS_ERR_PK_INVALID_ALG -0x3A80
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/** Elliptic curve is unsupported (only NIST curves are supported). */
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#define MBEDTLS_ERR_PK_UNKNOWN_NAMED_CURVE -0x3A00
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/** Unavailable feature, e.g. RSA disabled for RSA key. */
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#define MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE -0x3980
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/** The buffer contains a valid signature followed by more data. */
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#define MBEDTLS_ERR_PK_SIG_LEN_MISMATCH -0x3900
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/** The output buffer is too small. */
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#define MBEDTLS_ERR_PK_BUFFER_TOO_SMALL -0x3880
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief Public key types
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*/
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typedef enum {
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MBEDTLS_PK_NONE=0,
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MBEDTLS_PK_RSA,
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MBEDTLS_PK_ECKEY,
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MBEDTLS_PK_ECKEY_DH,
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MBEDTLS_PK_ECDSA,
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MBEDTLS_PK_RSA_ALT,
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MBEDTLS_PK_RSASSA_PSS,
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MBEDTLS_PK_OPAQUE,
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} mbedtls_pk_type_t;
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/**
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* \brief Options for RSASSA-PSS signature verification.
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* See \c mbedtls_rsa_rsassa_pss_verify_ext()
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*/
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typedef struct mbedtls_pk_rsassa_pss_options {
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/** The digest to use for MGF1 in PSS.
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*
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* \note When #MBEDTLS_USE_PSA_CRYPTO is enabled and #MBEDTLS_RSA_C is
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* disabled, this must be equal to the \c md_alg argument passed
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* to mbedtls_pk_verify_ext(). In a future version of the library,
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* this constraint may apply whenever #MBEDTLS_USE_PSA_CRYPTO is
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* enabled regardless of the status of #MBEDTLS_RSA_C.
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*/
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mbedtls_md_type_t mgf1_hash_id;
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/** The expected length of the salt, in bytes. This may be
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* #MBEDTLS_RSA_SALT_LEN_ANY to accept any salt length.
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*
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* \note When #MBEDTLS_USE_PSA_CRYPTO is enabled, only
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* #MBEDTLS_RSA_SALT_LEN_ANY is valid. Any other value may be
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* ignored (allowing any salt length).
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*/
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int expected_salt_len;
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} mbedtls_pk_rsassa_pss_options;
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/**
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* \brief Maximum size of a signature made by mbedtls_pk_sign().
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*/
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/* We need to set MBEDTLS_PK_SIGNATURE_MAX_SIZE to the maximum signature
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* size among the supported signature types. Do it by starting at 0,
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* then incrementally increasing to be large enough for each supported
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* signature mechanism.
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*
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* The resulting value can be 0, for example if MBEDTLS_ECDH_C is enabled
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* (which allows the pk module to be included) but neither MBEDTLS_ECDSA_C
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* nor MBEDTLS_RSA_C nor any opaque signature mechanism (PSA or RSA_ALT).
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*/
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#define MBEDTLS_PK_SIGNATURE_MAX_SIZE 0
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#if (defined(MBEDTLS_RSA_C) || defined(MBEDTLS_PK_RSA_ALT_SUPPORT)) && \
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MBEDTLS_MPI_MAX_SIZE > MBEDTLS_PK_SIGNATURE_MAX_SIZE
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/* For RSA, the signature can be as large as the bignum module allows.
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* For RSA_ALT, the signature size is not necessarily tied to what the
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* bignum module can do, but in the absence of any specific setting,
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* we use that (rsa_alt_sign_wrap in library/pk_wrap.h will check). */
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#undef MBEDTLS_PK_SIGNATURE_MAX_SIZE
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#define MBEDTLS_PK_SIGNATURE_MAX_SIZE MBEDTLS_MPI_MAX_SIZE
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#endif
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#if defined(MBEDTLS_ECDSA_C) && \
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MBEDTLS_ECDSA_MAX_LEN > MBEDTLS_PK_SIGNATURE_MAX_SIZE
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/* For ECDSA, the ecdsa module exports a constant for the maximum
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* signature size. */
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#undef MBEDTLS_PK_SIGNATURE_MAX_SIZE
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#define MBEDTLS_PK_SIGNATURE_MAX_SIZE MBEDTLS_ECDSA_MAX_LEN
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#endif
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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#if PSA_SIGNATURE_MAX_SIZE > MBEDTLS_PK_SIGNATURE_MAX_SIZE
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/* PSA_SIGNATURE_MAX_SIZE is the maximum size of a signature made
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* through the PSA API in the PSA representation. */
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#undef MBEDTLS_PK_SIGNATURE_MAX_SIZE
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#define MBEDTLS_PK_SIGNATURE_MAX_SIZE PSA_SIGNATURE_MAX_SIZE
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#endif
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#if PSA_VENDOR_ECDSA_SIGNATURE_MAX_SIZE + 11 > MBEDTLS_PK_SIGNATURE_MAX_SIZE
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/* The Mbed TLS representation is different for ECDSA signatures:
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* PSA uses the raw concatenation of r and s,
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* whereas Mbed TLS uses the ASN.1 representation (SEQUENCE of two INTEGERs).
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* Add the overhead of ASN.1: up to (1+2) + 2 * (1+2+1) for the
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* types, lengths (represented by up to 2 bytes), and potential leading
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* zeros of the INTEGERs and the SEQUENCE. */
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#undef MBEDTLS_PK_SIGNATURE_MAX_SIZE
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#define MBEDTLS_PK_SIGNATURE_MAX_SIZE (PSA_VENDOR_ECDSA_SIGNATURE_MAX_SIZE + 11)
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#endif
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#endif /* defined(MBEDTLS_USE_PSA_CRYPTO) */
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/* Internal helper to define which fields in the pk_context structure below
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* should be used for EC keys: legacy ecp_keypair or the raw (PSA friendly)
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* format. It should be noted that this only affects how data is stored, not
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* which functions are used for various operations. The overall picture looks
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* like this:
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* - if USE_PSA is not defined and ECP_C is defined then use ecp_keypair data
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* structure and legacy functions
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* - if USE_PSA is defined and
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* - if ECP_C then use ecp_keypair structure, convert data to a PSA friendly
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* format and use PSA functions
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* - if !ECP_C then use new raw data and PSA functions directly.
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*
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* The main reason for the "intermediate" (USE_PSA + ECP_C) above is that as long
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* as ECP_C is defined mbedtls_pk_ec() gives the user a read/write access to the
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* ecp_keypair structure inside the pk_context so they can modify it using
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* ECP functions which are not under PK module's control.
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*/
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#if defined(MBEDTLS_USE_PSA_CRYPTO) && defined(PSA_WANT_KEY_TYPE_ECC_PUBLIC_KEY) && \
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!defined(MBEDTLS_ECP_C)
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#define MBEDTLS_PK_USE_PSA_EC_DATA
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#endif
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/**
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* \brief Types for interfacing with the debug module
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*/
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typedef enum {
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MBEDTLS_PK_DEBUG_NONE = 0,
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MBEDTLS_PK_DEBUG_MPI,
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MBEDTLS_PK_DEBUG_ECP,
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MBEDTLS_PK_DEBUG_PSA_EC,
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} mbedtls_pk_debug_type;
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/**
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* \brief Item to send to the debug module
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*/
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typedef struct mbedtls_pk_debug_item {
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mbedtls_pk_debug_type MBEDTLS_PRIVATE(type);
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const char *MBEDTLS_PRIVATE(name);
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void *MBEDTLS_PRIVATE(value);
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} mbedtls_pk_debug_item;
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/** Maximum number of item send for debugging, plus 1 */
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#define MBEDTLS_PK_DEBUG_MAX_ITEMS 3
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/**
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* \brief Public key information and operations
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*
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* \note The library does not support custom pk info structures,
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* only built-in structures returned by
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* mbedtls_cipher_info_from_type().
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*/
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typedef struct mbedtls_pk_info_t mbedtls_pk_info_t;
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#define MBEDTLS_PK_MAX_EC_PUBKEY_RAW_LEN \
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PSA_KEY_EXPORT_ECC_PUBLIC_KEY_MAX_SIZE(PSA_VENDOR_ECC_MAX_CURVE_BITS)
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/**
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* \brief Public key container
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*/
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typedef struct mbedtls_pk_context {
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const mbedtls_pk_info_t *MBEDTLS_PRIVATE(pk_info); /**< Public key information */
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void *MBEDTLS_PRIVATE(pk_ctx); /**< Underlying public key context */
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/* The following field is used to store the ID of a private key in the
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* following cases:
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* - opaque key when MBEDTLS_USE_PSA_CRYPTO is defined
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* - normal key when MBEDTLS_PK_USE_PSA_EC_DATA is defined. In this case:
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* - the pk_ctx above is not not used to store the private key anymore.
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* Actually that field not populated at all in this case because also
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* the public key will be stored in raw format as explained below
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* - this ID is used for all private key operations (ex: sign, check
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* key pair, key write, etc) using PSA functions
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*
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* Note: this private key storing solution only affects EC keys, not the
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* other ones. The latters still use the pk_ctx to store their own
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* context. */
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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mbedtls_svc_key_id_t MBEDTLS_PRIVATE(priv_id); /**< Key ID for opaque keys */
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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/* The following fields are meant for storing the public key in raw format
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* which is handy for:
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* - easily importing it into the PSA context
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* - reducing the ECP module dependencies in the PK one.
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*
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* When MBEDTLS_PK_USE_PSA_EC_DATA is enabled:
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* - the pk_ctx above is not used anymore for storing the public key
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* inside the ecp_keypair structure
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* - the following fields are used for all public key operations: signature
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* verify, key pair check and key write.
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* - For a key pair, priv_id contains the private key. For a public key,
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* priv_id is null.
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* Of course, when MBEDTLS_PK_USE_PSA_EC_DATA is not enabled, the legacy
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* ecp_keypair structure is used for storing the public key and performing
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* all the operations.
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*
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* Note: This new public key storing solution only works for EC keys, not
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* other ones. The latters still use pk_ctx to store their own
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* context.
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*/
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#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
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uint8_t MBEDTLS_PRIVATE(pub_raw)[MBEDTLS_PK_MAX_EC_PUBKEY_RAW_LEN]; /**< Raw public key */
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size_t MBEDTLS_PRIVATE(pub_raw_len); /**< Valid bytes in "pub_raw" */
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psa_ecc_family_t MBEDTLS_PRIVATE(ec_family); /**< EC family of pk */
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size_t MBEDTLS_PRIVATE(ec_bits); /**< Curve's bits of pk */
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#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
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} mbedtls_pk_context;
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#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
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/**
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* \brief Context for resuming operations
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*/
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typedef struct {
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const mbedtls_pk_info_t *MBEDTLS_PRIVATE(pk_info); /**< Public key information */
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void *MBEDTLS_PRIVATE(rs_ctx); /**< Underlying restart context */
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} mbedtls_pk_restart_ctx;
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#else /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
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/* Now we can declare functions that take a pointer to that */
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typedef void mbedtls_pk_restart_ctx;
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#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
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#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
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/**
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* \brief Types for RSA-alt abstraction
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*/
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typedef int (*mbedtls_pk_rsa_alt_decrypt_func)(void *ctx, size_t *olen,
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const unsigned char *input, unsigned char *output,
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size_t output_max_len);
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typedef int (*mbedtls_pk_rsa_alt_sign_func)(void *ctx,
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int (*f_rng)(void *, unsigned char *, size_t),
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void *p_rng,
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mbedtls_md_type_t md_alg, unsigned int hashlen,
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const unsigned char *hash, unsigned char *sig);
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typedef size_t (*mbedtls_pk_rsa_alt_key_len_func)(void *ctx);
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#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
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/**
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* \brief Return information associated with the given PK type
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*
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* \param pk_type PK type to search for.
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*
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* \return The PK info associated with the type or NULL if not found.
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*/
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const mbedtls_pk_info_t *mbedtls_pk_info_from_type(mbedtls_pk_type_t pk_type);
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/**
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* \brief Initialize a #mbedtls_pk_context (as NONE).
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*
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* \param ctx The context to initialize.
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* This must not be \c NULL.
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*/
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void mbedtls_pk_init(mbedtls_pk_context *ctx);
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/**
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* \brief Free the components of a #mbedtls_pk_context.
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*
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* \param ctx The context to clear. It must have been initialized.
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* If this is \c NULL, this function does nothing.
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*
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* \note For contexts that have been set up with
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* mbedtls_pk_setup_opaque(), this does not free the underlying
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* PSA key and you still need to call psa_destroy_key()
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* independently if you want to destroy that key.
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*/
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void mbedtls_pk_free(mbedtls_pk_context *ctx);
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#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
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/**
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* \brief Initialize a restart context
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*
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* \param ctx The context to initialize.
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* This must not be \c NULL.
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*/
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void mbedtls_pk_restart_init(mbedtls_pk_restart_ctx *ctx);
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/**
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* \brief Free the components of a restart context
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*
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* \param ctx The context to clear. It must have been initialized.
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* If this is \c NULL, this function does nothing.
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*/
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void mbedtls_pk_restart_free(mbedtls_pk_restart_ctx *ctx);
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#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
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/**
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* \brief Initialize a PK context with the information given
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* and allocates the type-specific PK subcontext.
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*
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* \param ctx Context to initialize. It must not have been set
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* up yet (type #MBEDTLS_PK_NONE).
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* \param info Information to use
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*
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* \return 0 on success,
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* MBEDTLS_ERR_PK_BAD_INPUT_DATA on invalid input,
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* MBEDTLS_ERR_PK_ALLOC_FAILED on allocation failure.
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*
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* \note For contexts holding an RSA-alt key, use
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* \c mbedtls_pk_setup_rsa_alt() instead.
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*/
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int mbedtls_pk_setup(mbedtls_pk_context *ctx, const mbedtls_pk_info_t *info);
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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/**
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* \brief Initialize a PK context to wrap a PSA key.
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*
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* This function creates a PK context which wraps a PSA key. The PSA wrapped
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* key must be an EC or RSA key pair (DH is not suported in the PK module).
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*
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* Under the hood PSA functions will be used to perform the required
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* operations and, based on the key type, used algorithms will be:
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* * EC:
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* * verify, verify_ext, sign, sign_ext: ECDSA.
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* * RSA:
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* * sign, decrypt: use the primary algorithm in the wrapped PSA key;
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* * sign_ext: RSA PSS if the pk_type is #MBEDTLS_PK_RSASSA_PSS, otherwise
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* it falls back to the sign() case;
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* * verify, verify_ext, encrypt: not supported.
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*
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* In order for the above operations to succeed, the policy of the wrapped PSA
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* key must allow the specified algorithm.
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*
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* Opaque PK contexts wrapping an EC keys also support \c mbedtls_pk_check_pair(),
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* whereas RSA ones do not.
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*
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* \warning The PSA wrapped key must remain valid as long as the wrapping PK
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* context is in use, that is at least between the point this function
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* is called and the point mbedtls_pk_free() is called on this context.
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*
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* \param ctx The context to initialize. It must be empty (type NONE).
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* \param key The PSA key to wrap, which must hold an ECC or RSA key pair.
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_PK_BAD_INPUT_DATA on invalid input (context already
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* used, invalid key identifier).
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* \return #MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE if the key is not an ECC or
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* RSA key pair.
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* \return #MBEDTLS_ERR_PK_ALLOC_FAILED on allocation failure.
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*/
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int mbedtls_pk_setup_opaque(mbedtls_pk_context *ctx,
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const mbedtls_svc_key_id_t key);
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
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/**
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* \brief Initialize an RSA-alt context
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*
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* \param ctx Context to initialize. It must not have been set
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* up yet (type #MBEDTLS_PK_NONE).
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* \param key RSA key pointer
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* \param decrypt_func Decryption function
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* \param sign_func Signing function
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* \param key_len_func Function returning key length in bytes
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*
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* \return 0 on success, or MBEDTLS_ERR_PK_BAD_INPUT_DATA if the
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* context wasn't already initialized as RSA_ALT.
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*
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* \note This function replaces \c mbedtls_pk_setup() for RSA-alt.
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*/
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int mbedtls_pk_setup_rsa_alt(mbedtls_pk_context *ctx, void *key,
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mbedtls_pk_rsa_alt_decrypt_func decrypt_func,
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mbedtls_pk_rsa_alt_sign_func sign_func,
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mbedtls_pk_rsa_alt_key_len_func key_len_func);
|
|
#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
|
|
|
|
/**
|
|
* \brief Get the size in bits of the underlying key
|
|
*
|
|
* \param ctx The context to query. It must have been initialized.
|
|
*
|
|
* \return Key size in bits, or 0 on error
|
|
*/
|
|
size_t mbedtls_pk_get_bitlen(const mbedtls_pk_context *ctx);
|
|
|
|
/**
|
|
* \brief Get the length in bytes of the underlying key
|
|
*
|
|
* \param ctx The context to query. It must have been initialized.
|
|
*
|
|
* \return Key length in bytes, or 0 on error
|
|
*/
|
|
static inline size_t mbedtls_pk_get_len(const mbedtls_pk_context *ctx)
|
|
{
|
|
return (mbedtls_pk_get_bitlen(ctx) + 7) / 8;
|
|
}
|
|
|
|
/**
|
|
* \brief Tell if a context can do the operation given by type
|
|
*
|
|
* \param ctx The context to query. It must have been initialized.
|
|
* \param type The desired type.
|
|
*
|
|
* \return 1 if the context can do operations on the given type.
|
|
* \return 0 if the context cannot do the operations on the given
|
|
* type. This is always the case for a context that has
|
|
* been initialized but not set up, or that has been
|
|
* cleared with mbedtls_pk_free().
|
|
*/
|
|
int mbedtls_pk_can_do(const mbedtls_pk_context *ctx, mbedtls_pk_type_t type);
|
|
|
|
#if defined(MBEDTLS_USE_PSA_CRYPTO)
|
|
/**
|
|
* \brief Tell if context can do the operation given by PSA algorithm
|
|
*
|
|
* \param ctx The context to query. It must have been initialized.
|
|
* \param alg PSA algorithm to check against, the following are allowed:
|
|
* PSA_ALG_RSA_PKCS1V15_SIGN(hash),
|
|
* PSA_ALG_RSA_PSS(hash),
|
|
* PSA_ALG_RSA_PKCS1V15_CRYPT,
|
|
* PSA_ALG_ECDSA(hash),
|
|
* PSA_ALG_ECDH, where hash is a specific hash.
|
|
* \param usage PSA usage flag to check against, must be composed of:
|
|
* PSA_KEY_USAGE_SIGN_HASH
|
|
* PSA_KEY_USAGE_DECRYPT
|
|
* PSA_KEY_USAGE_DERIVE.
|
|
* Context key must match all passed usage flags.
|
|
*
|
|
* \warning Since the set of allowed algorithms and usage flags may be
|
|
* expanded in the future, the return value \c 0 should not
|
|
* be taken in account for non-allowed algorithms and usage
|
|
* flags.
|
|
*
|
|
* \return 1 if the context can do operations on the given type.
|
|
* \return 0 if the context cannot do the operations on the given
|
|
* type, for non-allowed algorithms and usage flags, or
|
|
* for a context that has been initialized but not set up
|
|
* or that has been cleared with mbedtls_pk_free().
|
|
*/
|
|
int mbedtls_pk_can_do_ext(const mbedtls_pk_context *ctx, psa_algorithm_t alg,
|
|
psa_key_usage_t usage);
|
|
#endif /* MBEDTLS_USE_PSA_CRYPTO */
|
|
|
|
#if defined(MBEDTLS_PSA_CRYPTO_CLIENT)
|
|
/**
|
|
* \brief Determine valid PSA attributes that can be used to
|
|
* import a key into PSA.
|
|
*
|
|
* The attributes determined by this function are suitable
|
|
* for calling mbedtls_pk_import_into_psa() to create
|
|
* a PSA key with the same key material.
|
|
*
|
|
* The typical flow of operations involving this function is
|
|
* ```
|
|
* psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
|
|
* int ret = mbedtls_pk_get_psa_attributes(pk, &attributes);
|
|
* if (ret != 0) ...; // error handling omitted
|
|
* // Tweak attributes if desired
|
|
* psa_key_id_t key_id = 0;
|
|
* ret = mbedtls_pk_import_into_psa(pk, &attributes, &key_id);
|
|
* if (ret != 0) ...; // error handling omitted
|
|
* ```
|
|
*
|
|
* \note This function does not support RSA-alt contexts
|
|
* (set up with mbedtls_pk_setup_rsa_alt()).
|
|
*
|
|
* \param[in] pk The PK context to use. It must have been set up.
|
|
* It can either contain a key pair or just a public key.
|
|
* \param usage A single `PSA_KEY_USAGE_xxx` flag among the following:
|
|
* - #PSA_KEY_USAGE_DECRYPT: \p pk must contain a
|
|
* key pair. The output \p attributes will contain a
|
|
* key pair type, and the usage policy will allow
|
|
* #PSA_KEY_USAGE_ENCRYPT as well as
|
|
* #PSA_KEY_USAGE_DECRYPT.
|
|
* - #PSA_KEY_USAGE_DERIVE: \p pk must contain a
|
|
* key pair. The output \p attributes will contain a
|
|
* key pair type.
|
|
* - #PSA_KEY_USAGE_ENCRYPT: The output
|
|
* \p attributes will contain a public key type.
|
|
* - #PSA_KEY_USAGE_SIGN_HASH: \p pk must contain a
|
|
* key pair. The output \p attributes will contain a
|
|
* key pair type, and the usage policy will allow
|
|
* #PSA_KEY_USAGE_VERIFY_HASH as well as
|
|
* #PSA_KEY_USAGE_SIGN_HASH.
|
|
* - #PSA_KEY_USAGE_SIGN_MESSAGE: \p pk must contain a
|
|
* key pair. The output \p attributes will contain a
|
|
* key pair type, and the usage policy will allow
|
|
* #PSA_KEY_USAGE_VERIFY_MESSAGE as well as
|
|
* #PSA_KEY_USAGE_SIGN_MESSAGE.
|
|
* - #PSA_KEY_USAGE_VERIFY_HASH: The output
|
|
* \p attributes will contain a public key type.
|
|
* - #PSA_KEY_USAGE_VERIFY_MESSAGE: The output
|
|
* \p attributes will contain a public key type.
|
|
* \param[out] attributes
|
|
* On success, valid attributes to import the key into PSA.
|
|
* - The lifetime and key identifier are unchanged. If the
|
|
* attribute structure was initialized or reset before
|
|
* calling this function, this will result in a volatile
|
|
* key. Call psa_set_key_identifier() before or after this
|
|
* function if you wish to create a persistent key. Call
|
|
* psa_set_key_lifetime() before or after this function if
|
|
* you wish to import the key in a secure element.
|
|
* - The key type and bit-size are determined by the contents
|
|
* of the PK context. If the PK context contains a key
|
|
* pair, the key type can be either a key pair type or
|
|
* the corresponding public key type, depending on
|
|
* \p usage. If the PK context contains a public key,
|
|
* the key type is a public key type.
|
|
* - The key's policy is determined by the key type and
|
|
* the \p usage parameter. The usage always allows
|
|
* \p usage, exporting and copying the key, and
|
|
* possibly other permissions as documented for the
|
|
* \p usage parameter.
|
|
* The permitted algorithm policy is determined as follows
|
|
* based on the #mbedtls_pk_type_t type of \p pk,
|
|
* the chosen \p usage and other factors:
|
|
* - #MBEDTLS_PK_RSA whose underlying
|
|
* #mbedtls_rsa_context has the padding mode
|
|
* #MBEDTLS_RSA_PKCS_V15:
|
|
* #PSA_ALG_RSA_PKCS1V15_SIGN(#PSA_ALG_ANY_HASH)
|
|
* if \p usage is SIGN/VERIFY, and
|
|
* #PSA_ALG_RSA_PKCS1V15_CRYPT
|
|
* if \p usage is ENCRYPT/DECRYPT.
|
|
* - #MBEDTLS_PK_RSA whose underlying
|
|
* #mbedtls_rsa_context has the padding mode
|
|
* #MBEDTLS_RSA_PKCS_V21 and the digest type
|
|
* corresponding to the PSA algorithm \c hash:
|
|
* #PSA_ALG_RSA_PSS_ANY_SALT(#PSA_ALG_ANY_HASH)
|
|
* if \p usage is SIGN/VERIFY, and
|
|
* #PSA_ALG_RSA_OAEP(\c hash)
|
|
* if \p usage is ENCRYPT/DECRYPT.
|
|
* - #MBEDTLS_PK_RSA_ALT: not supported.
|
|
* - #MBEDTLS_PK_ECDSA or #MBEDTLS_PK_ECKEY
|
|
* if \p usage is SIGN/VERIFY:
|
|
* #PSA_ALG_DETERMINISTIC_ECDSA(#PSA_ALG_ANY_HASH)
|
|
* if #MBEDTLS_ECDSA_DETERMINISTIC is enabled,
|
|
* otherwise #PSA_ALG_ECDSA(#PSA_ALG_ANY_HASH).
|
|
* - #MBEDTLS_PK_ECKEY_DH or #MBEDTLS_PK_ECKEY
|
|
* if \p usage is DERIVE:
|
|
* #PSA_ALG_ECDH.
|
|
* - #MBEDTLS_PK_OPAQUE: same as the primary algorithm
|
|
* set for the underlying PSA key, except that
|
|
* sign/decrypt flags are removed if the type is
|
|
* set to a public key type.
|
|
* The underlying key must allow \p usage.
|
|
* Note that the enrollment algorithm set with
|
|
* psa_set_key_enrollment_algorithm() is not copied.
|
|
*
|
|
* \return 0 on success.
|
|
* #MBEDTLS_ERR_PK_TYPE_MISMATCH if \p pk does not contain
|
|
* a key of the type identified in \p attributes.
|
|
* Another error code on other failures.
|
|
*/
|
|
int mbedtls_pk_get_psa_attributes(const mbedtls_pk_context *pk,
|
|
psa_key_usage_t usage,
|
|
psa_key_attributes_t *attributes);
|
|
|
|
/**
|
|
* \brief Import a key into the PSA key store.
|
|
*
|
|
* This function is equivalent to calling psa_import_key()
|
|
* with the key material from \p pk.
|
|
*
|
|
* The typical way to use this function is:
|
|
* -# Call mbedtls_pk_get_psa_attributes() to obtain
|
|
* attributes for the given key.
|
|
* -# If desired, modify the attributes, for example:
|
|
* - To create a persistent key, call
|
|
* psa_set_key_identifier() and optionally
|
|
* psa_set_key_lifetime().
|
|
* - To import only the public part of a key pair:
|
|
*
|
|
* psa_set_key_type(&attributes,
|
|
* PSA_KEY_TYPE_PUBLIC_KEY_OF_KEY_PAIR(
|
|
* psa_get_key_type(&attributes)));
|
|
* - Restrict the key usage if desired.
|
|
* -# Call mbedtls_pk_import_into_psa().
|
|
*
|
|
* \note This function does not support RSA-alt contexts
|
|
* (set up with mbedtls_pk_setup_rsa_alt()).
|
|
*
|
|
* \param[in] pk The PK context to use. It must have been set up.
|
|
* It can either contain a key pair or just a public key.
|
|
* \param[in] attributes
|
|
* The attributes to use for the new key. They must be
|
|
* compatible with \p pk. In particular, the key type
|
|
* must match the content of \p pk.
|
|
* If \p pk contains a key pair, the key type in
|
|
* attributes can be either the key pair type or the
|
|
* corresponding public key type (to import only the
|
|
* public part).
|
|
* \param[out] key_id
|
|
* On success, the identifier of the newly created key.
|
|
* On error, this is #MBEDTLS_SVC_KEY_ID_INIT.
|
|
*
|
|
* \return 0 on success.
|
|
* #MBEDTLS_ERR_PK_TYPE_MISMATCH if \p pk does not contain
|
|
* a key of the type identified in \p attributes.
|
|
* Another error code on other failures.
|
|
*/
|
|
int mbedtls_pk_import_into_psa(const mbedtls_pk_context *pk,
|
|
const psa_key_attributes_t *attributes,
|
|
mbedtls_svc_key_id_t *key_id);
|
|
|
|
/**
|
|
* \brief Create a PK context starting from a key stored in PSA.
|
|
* This key:
|
|
* - must be exportable and
|
|
* - must be an RSA or EC key pair or public key (FFDH is not supported in PK).
|
|
*
|
|
* The resulting PK object will be a transparent type:
|
|
* - #MBEDTLS_PK_RSA for RSA keys or
|
|
* - #MBEDTLS_PK_ECKEY for EC keys.
|
|
*
|
|
* Once this functions returns the PK object will be completely
|
|
* independent from the original PSA key that it was generated
|
|
* from.
|
|
* Calling mbedtls_pk_sign(), mbedtls_pk_verify(),
|
|
* mbedtls_pk_encrypt(), mbedtls_pk_decrypt() on the resulting
|
|
* PK context will perform the corresponding algorithm for that
|
|
* PK context type.
|
|
* * For ECDSA, the choice of deterministic vs randomized will
|
|
* be based on the compile-time setting #MBEDTLS_ECDSA_DETERMINISTIC.
|
|
* * For an RSA key, the output PK context will allow both
|
|
* encrypt/decrypt and sign/verify regardless of the original
|
|
* key's policy.
|
|
* The original key's policy determines the output key's padding
|
|
* mode: PCKS1 v2.1 is set if the PSA key policy is OAEP or PSS,
|
|
* otherwise PKCS1 v1.5 is set.
|
|
*
|
|
* \param key_id The key identifier of the key stored in PSA.
|
|
* \param pk The PK context that will be filled. It must be initialized,
|
|
* but not set up.
|
|
*
|
|
* \return 0 on success.
|
|
* \return #MBEDTLS_ERR_PK_BAD_INPUT_DATA in case the provided input
|
|
* parameters are not correct.
|
|
*/
|
|
int mbedtls_pk_copy_from_psa(mbedtls_svc_key_id_t key_id, mbedtls_pk_context *pk);
|
|
|
|
/**
|
|
* \brief Create a PK context for the public key of a PSA key.
|
|
*
|
|
* The key must be an RSA or ECC key. It can be either a
|
|
* public key or a key pair, and only the public key is copied.
|
|
* The resulting PK object will be a transparent type:
|
|
* - #MBEDTLS_PK_RSA for RSA keys or
|
|
* - #MBEDTLS_PK_ECKEY for EC keys.
|
|
*
|
|
* Once this functions returns the PK object will be completely
|
|
* independent from the original PSA key that it was generated
|
|
* from.
|
|
* Calling mbedtls_pk_verify() or
|
|
* mbedtls_pk_encrypt() on the resulting
|
|
* PK context will perform the corresponding algorithm for that
|
|
* PK context type.
|
|
*
|
|
* For an RSA key, the output PK context will allow both
|
|
* encrypt and verify regardless of the original key's policy.
|
|
* The original key's policy determines the output key's padding
|
|
* mode: PCKS1 v2.1 is set if the PSA key policy is OAEP or PSS,
|
|
* otherwise PKCS1 v1.5 is set.
|
|
*
|
|
* \param key_id The key identifier of the key stored in PSA.
|
|
* \param pk The PK context that will be filled. It must be initialized,
|
|
* but not set up.
|
|
*
|
|
* \return 0 on success.
|
|
* \return MBEDTLS_ERR_PK_BAD_INPUT_DATA in case the provided input
|
|
* parameters are not correct.
|
|
*/
|
|
int mbedtls_pk_copy_public_from_psa(mbedtls_svc_key_id_t key_id, mbedtls_pk_context *pk);
|
|
#endif /* MBEDTLS_PSA_CRYPTO_CLIENT */
|
|
|
|
/**
|
|
* \brief Verify signature (including padding if relevant).
|
|
*
|
|
* \param ctx The PK context to use. It must have been set up.
|
|
* \param md_alg Hash algorithm used.
|
|
* This can be #MBEDTLS_MD_NONE if the signature algorithm
|
|
* does not rely on a hash algorithm (non-deterministic
|
|
* ECDSA, RSA PKCS#1 v1.5).
|
|
* For PKCS#1 v1.5, if \p md_alg is #MBEDTLS_MD_NONE, then
|
|
* \p hash is the DigestInfo structure used by RFC 8017
|
|
* §9.2 steps 3–6. If \p md_alg is a valid hash
|
|
* algorithm then \p hash is the digest itself, and this
|
|
* function calculates the DigestInfo encoding internally.
|
|
* \param hash Hash of the message to sign
|
|
* \param hash_len Hash length
|
|
* \param sig Signature to verify
|
|
* \param sig_len Signature length
|
|
*
|
|
* \note For keys of type #MBEDTLS_PK_RSA, the signature algorithm is
|
|
* either PKCS#1 v1.5 or PSS (accepting any salt length),
|
|
* depending on the padding mode in the underlying RSA context.
|
|
* For a pk object constructed by parsing, this is PKCS#1 v1.5
|
|
* by default. Use mbedtls_pk_verify_ext() to explicitly select
|
|
* a different algorithm.
|
|
*
|
|
* \return 0 on success (signature is valid),
|
|
* #MBEDTLS_ERR_PK_SIG_LEN_MISMATCH if there is a valid
|
|
* signature in \p sig but its length is less than \p sig_len,
|
|
* or a specific error code.
|
|
*/
|
|
int mbedtls_pk_verify(mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
const unsigned char *sig, size_t sig_len);
|
|
|
|
/**
|
|
* \brief Restartable version of \c mbedtls_pk_verify()
|
|
*
|
|
* \note Performs the same job as \c mbedtls_pk_verify(), but can
|
|
* return early and restart according to the limit set with
|
|
* \c mbedtls_ecp_set_max_ops() to reduce blocking for ECC
|
|
* operations. For RSA, same as \c mbedtls_pk_verify().
|
|
*
|
|
* \param ctx The PK context to use. It must have been set up.
|
|
* \param md_alg Hash algorithm used (see notes)
|
|
* \param hash Hash of the message to sign
|
|
* \param hash_len Hash length or 0 (see notes)
|
|
* \param sig Signature to verify
|
|
* \param sig_len Signature length
|
|
* \param rs_ctx Restart context (NULL to disable restart)
|
|
*
|
|
* \return See \c mbedtls_pk_verify(), or
|
|
* \return #MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of
|
|
* operations was reached: see \c mbedtls_ecp_set_max_ops().
|
|
*/
|
|
int mbedtls_pk_verify_restartable(mbedtls_pk_context *ctx,
|
|
mbedtls_md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
const unsigned char *sig, size_t sig_len,
|
|
mbedtls_pk_restart_ctx *rs_ctx);
|
|
|
|
/**
|
|
* \brief Verify signature, with options.
|
|
* (Includes verification of the padding depending on type.)
|
|
*
|
|
* \param type Signature type (inc. possible padding type) to verify
|
|
* \param options Pointer to type-specific options, or NULL
|
|
* \param ctx The PK context to use. It must have been set up.
|
|
* \param md_alg Hash algorithm used (see notes)
|
|
* \param hash Hash of the message to sign
|
|
* \param hash_len Hash length or 0 (see notes)
|
|
* \param sig Signature to verify
|
|
* \param sig_len Signature length
|
|
*
|
|
* \return 0 on success (signature is valid),
|
|
* #MBEDTLS_ERR_PK_TYPE_MISMATCH if the PK context can't be
|
|
* used for this type of signatures,
|
|
* #MBEDTLS_ERR_PK_SIG_LEN_MISMATCH if there is a valid
|
|
* signature in \p sig but its length is less than \p sig_len,
|
|
* or a specific error code.
|
|
*
|
|
* \note If hash_len is 0, then the length associated with md_alg
|
|
* is used instead, or an error returned if it is invalid.
|
|
*
|
|
* \note md_alg may be MBEDTLS_MD_NONE, only if hash_len != 0
|
|
*
|
|
* \note If type is MBEDTLS_PK_RSASSA_PSS, then options must point
|
|
* to a mbedtls_pk_rsassa_pss_options structure,
|
|
* otherwise it must be NULL. Note that if
|
|
* #MBEDTLS_USE_PSA_CRYPTO is defined, the salt length is not
|
|
* verified as PSA_ALG_RSA_PSS_ANY_SALT is used.
|
|
*/
|
|
int mbedtls_pk_verify_ext(mbedtls_pk_type_t type, const void *options,
|
|
mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
const unsigned char *sig, size_t sig_len);
|
|
|
|
/**
|
|
* \brief Make signature, including padding if relevant.
|
|
*
|
|
* \param ctx The PK context to use. It must have been set up
|
|
* with a private key.
|
|
* \param md_alg Hash algorithm used (see notes)
|
|
* \param hash Hash of the message to sign
|
|
* \param hash_len Hash length
|
|
* \param sig Place to write the signature.
|
|
* It must have enough room for the signature.
|
|
* #MBEDTLS_PK_SIGNATURE_MAX_SIZE is always enough.
|
|
* You may use a smaller buffer if it is large enough
|
|
* given the key type.
|
|
* \param sig_size The size of the \p sig buffer in bytes.
|
|
* \param sig_len On successful return,
|
|
* the number of bytes written to \p sig.
|
|
* \param f_rng RNG function, must not be \c NULL.
|
|
* \param p_rng RNG parameter
|
|
*
|
|
* \note For keys of type #MBEDTLS_PK_RSA, the signature algorithm is
|
|
* either PKCS#1 v1.5 or PSS (using the largest possible salt
|
|
* length up to the hash length), depending on the padding mode
|
|
* in the underlying RSA context. For a pk object constructed
|
|
* by parsing, this is PKCS#1 v1.5 by default. Use
|
|
* mbedtls_pk_verify_ext() to explicitly select a different
|
|
* algorithm.
|
|
*
|
|
* \return 0 on success, or a specific error code.
|
|
*
|
|
* \note For RSA, md_alg may be MBEDTLS_MD_NONE if hash_len != 0.
|
|
* For ECDSA, md_alg may never be MBEDTLS_MD_NONE.
|
|
*/
|
|
int mbedtls_pk_sign(mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
unsigned char *sig, size_t sig_size, size_t *sig_len,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng);
|
|
|
|
/**
|
|
* \brief Make signature given a signature type.
|
|
*
|
|
* \param pk_type Signature type.
|
|
* \param ctx The PK context to use. It must have been set up
|
|
* with a private key.
|
|
* \param md_alg Hash algorithm used (see notes)
|
|
* \param hash Hash of the message to sign
|
|
* \param hash_len Hash length
|
|
* \param sig Place to write the signature.
|
|
* It must have enough room for the signature.
|
|
* #MBEDTLS_PK_SIGNATURE_MAX_SIZE is always enough.
|
|
* You may use a smaller buffer if it is large enough
|
|
* given the key type.
|
|
* \param sig_size The size of the \p sig buffer in bytes.
|
|
* \param sig_len On successful return,
|
|
* the number of bytes written to \p sig.
|
|
* \param f_rng RNG function, must not be \c NULL.
|
|
* \param p_rng RNG parameter
|
|
*
|
|
* \return 0 on success, or a specific error code.
|
|
*
|
|
* \note When \p pk_type is #MBEDTLS_PK_RSASSA_PSS,
|
|
* see #PSA_ALG_RSA_PSS for a description of PSS options used.
|
|
*
|
|
* \note For RSA, md_alg may be MBEDTLS_MD_NONE if hash_len != 0.
|
|
* For ECDSA, md_alg may never be MBEDTLS_MD_NONE.
|
|
*
|
|
*/
|
|
int mbedtls_pk_sign_ext(mbedtls_pk_type_t pk_type,
|
|
mbedtls_pk_context *ctx,
|
|
mbedtls_md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
unsigned char *sig, size_t sig_size, size_t *sig_len,
|
|
int (*f_rng)(void *, unsigned char *, size_t),
|
|
void *p_rng);
|
|
|
|
/**
|
|
* \brief Restartable version of \c mbedtls_pk_sign()
|
|
*
|
|
* \note Performs the same job as \c mbedtls_pk_sign(), but can
|
|
* return early and restart according to the limit set with
|
|
* \c mbedtls_ecp_set_max_ops() to reduce blocking for ECC
|
|
* operations. For RSA, same as \c mbedtls_pk_sign().
|
|
*
|
|
* \param ctx The PK context to use. It must have been set up
|
|
* with a private key.
|
|
* \param md_alg Hash algorithm used (see notes for mbedtls_pk_sign())
|
|
* \param hash Hash of the message to sign
|
|
* \param hash_len Hash length
|
|
* \param sig Place to write the signature.
|
|
* It must have enough room for the signature.
|
|
* #MBEDTLS_PK_SIGNATURE_MAX_SIZE is always enough.
|
|
* You may use a smaller buffer if it is large enough
|
|
* given the key type.
|
|
* \param sig_size The size of the \p sig buffer in bytes.
|
|
* \param sig_len On successful return,
|
|
* the number of bytes written to \p sig.
|
|
* \param f_rng RNG function, must not be \c NULL.
|
|
* \param p_rng RNG parameter
|
|
* \param rs_ctx Restart context (NULL to disable restart)
|
|
*
|
|
* \return See \c mbedtls_pk_sign().
|
|
* \return #MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of
|
|
* operations was reached: see \c mbedtls_ecp_set_max_ops().
|
|
*/
|
|
int mbedtls_pk_sign_restartable(mbedtls_pk_context *ctx,
|
|
mbedtls_md_type_t md_alg,
|
|
const unsigned char *hash, size_t hash_len,
|
|
unsigned char *sig, size_t sig_size, size_t *sig_len,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
|
|
mbedtls_pk_restart_ctx *rs_ctx);
|
|
|
|
/**
|
|
* \brief Decrypt message (including padding if relevant).
|
|
*
|
|
* \param ctx The PK context to use. It must have been set up
|
|
* with a private key.
|
|
* \param input Input to decrypt
|
|
* \param ilen Input size
|
|
* \param output Decrypted output
|
|
* \param olen Decrypted message length
|
|
* \param osize Size of the output buffer
|
|
* \param f_rng RNG function, must not be \c NULL.
|
|
* \param p_rng RNG parameter
|
|
*
|
|
* \note For keys of type #MBEDTLS_PK_RSA, the signature algorithm is
|
|
* either PKCS#1 v1.5 or OAEP, depending on the padding mode in
|
|
* the underlying RSA context. For a pk object constructed by
|
|
* parsing, this is PKCS#1 v1.5 by default.
|
|
*
|
|
* \return 0 on success, or a specific error code.
|
|
*/
|
|
int mbedtls_pk_decrypt(mbedtls_pk_context *ctx,
|
|
const unsigned char *input, size_t ilen,
|
|
unsigned char *output, size_t *olen, size_t osize,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng);
|
|
|
|
/**
|
|
* \brief Encrypt message (including padding if relevant).
|
|
*
|
|
* \param ctx The PK context to use. It must have been set up.
|
|
* \param input Message to encrypt
|
|
* \param ilen Message size
|
|
* \param output Encrypted output
|
|
* \param olen Encrypted output length
|
|
* \param osize Size of the output buffer
|
|
* \param f_rng RNG function, must not be \c NULL.
|
|
* \param p_rng RNG parameter
|
|
*
|
|
* \note For keys of type #MBEDTLS_PK_RSA, the signature algorithm is
|
|
* either PKCS#1 v1.5 or OAEP, depending on the padding mode in
|
|
* the underlying RSA context. For a pk object constructed by
|
|
* parsing, this is PKCS#1 v1.5 by default.
|
|
*
|
|
* \note \p f_rng is used for padding generation.
|
|
*
|
|
* \return 0 on success, or a specific error code.
|
|
*/
|
|
int mbedtls_pk_encrypt(mbedtls_pk_context *ctx,
|
|
const unsigned char *input, size_t ilen,
|
|
unsigned char *output, size_t *olen, size_t osize,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng);
|
|
|
|
/**
|
|
* \brief Check if a public-private pair of keys matches.
|
|
*
|
|
* \param pub Context holding a public key.
|
|
* \param prv Context holding a private (and public) key.
|
|
* \param f_rng RNG function, must not be \c NULL.
|
|
* \param p_rng RNG parameter
|
|
*
|
|
* \return \c 0 on success (keys were checked and match each other).
|
|
* \return #MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE if the keys could not
|
|
* be checked - in that case they may or may not match.
|
|
* \return #MBEDTLS_ERR_PK_BAD_INPUT_DATA if a context is invalid.
|
|
* \return Another non-zero value if the keys do not match.
|
|
*/
|
|
int mbedtls_pk_check_pair(const mbedtls_pk_context *pub,
|
|
const mbedtls_pk_context *prv,
|
|
int (*f_rng)(void *, unsigned char *, size_t),
|
|
void *p_rng);
|
|
|
|
/**
|
|
* \brief Export debug information
|
|
*
|
|
* \param ctx The PK context to use. It must have been initialized.
|
|
* \param items Place to write debug items
|
|
*
|
|
* \return 0 on success or MBEDTLS_ERR_PK_BAD_INPUT_DATA
|
|
*/
|
|
int mbedtls_pk_debug(const mbedtls_pk_context *ctx, mbedtls_pk_debug_item *items);
|
|
|
|
/**
|
|
* \brief Access the type name
|
|
*
|
|
* \param ctx The PK context to use. It must have been initialized.
|
|
*
|
|
* \return Type name on success, or "invalid PK"
|
|
*/
|
|
const char *mbedtls_pk_get_name(const mbedtls_pk_context *ctx);
|
|
|
|
/**
|
|
* \brief Get the key type
|
|
*
|
|
* \param ctx The PK context to use. It must have been initialized.
|
|
*
|
|
* \return Type on success.
|
|
* \return #MBEDTLS_PK_NONE for a context that has not been set up.
|
|
*/
|
|
mbedtls_pk_type_t mbedtls_pk_get_type(const mbedtls_pk_context *ctx);
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
/**
|
|
* Quick access to an RSA context inside a PK context.
|
|
*
|
|
* \warning This function can only be used when the type of the context, as
|
|
* returned by mbedtls_pk_get_type(), is #MBEDTLS_PK_RSA.
|
|
* Ensuring that is the caller's responsibility.
|
|
* Alternatively, you can check whether this function returns NULL.
|
|
*
|
|
* \return The internal RSA context held by the PK context, or NULL.
|
|
*/
|
|
static inline mbedtls_rsa_context *mbedtls_pk_rsa(const mbedtls_pk_context pk)
|
|
{
|
|
switch (mbedtls_pk_get_type(&pk)) {
|
|
case MBEDTLS_PK_RSA:
|
|
return (mbedtls_rsa_context *) (pk).MBEDTLS_PRIVATE(pk_ctx);
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_RSA_C */
|
|
|
|
#if defined(MBEDTLS_ECP_C)
|
|
/**
|
|
* Quick access to an EC context inside a PK context.
|
|
*
|
|
* \warning This function can only be used when the type of the context, as
|
|
* returned by mbedtls_pk_get_type(), is #MBEDTLS_PK_ECKEY,
|
|
* #MBEDTLS_PK_ECKEY_DH, or #MBEDTLS_PK_ECDSA.
|
|
* Ensuring that is the caller's responsibility.
|
|
* Alternatively, you can check whether this function returns NULL.
|
|
*
|
|
* \return The internal EC context held by the PK context, or NULL.
|
|
*/
|
|
static inline mbedtls_ecp_keypair *mbedtls_pk_ec(const mbedtls_pk_context pk)
|
|
{
|
|
switch (mbedtls_pk_get_type(&pk)) {
|
|
case MBEDTLS_PK_ECKEY:
|
|
case MBEDTLS_PK_ECKEY_DH:
|
|
case MBEDTLS_PK_ECDSA:
|
|
return (mbedtls_ecp_keypair *) (pk).MBEDTLS_PRIVATE(pk_ctx);
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_ECP_C */
|
|
|
|
#if defined(MBEDTLS_PK_PARSE_C)
|
|
/** \ingroup pk_module */
|
|
/**
|
|
* \brief Parse a private key in PEM or DER format
|
|
*
|
|
* \note If #MBEDTLS_USE_PSA_CRYPTO is enabled, the PSA crypto
|
|
* subsystem must have been initialized by calling
|
|
* psa_crypto_init() before calling this function.
|
|
*
|
|
* \param ctx The PK context to fill. It must have been initialized
|
|
* but not set up.
|
|
* \param key Input buffer to parse.
|
|
* The buffer must contain the input exactly, with no
|
|
* extra trailing material. For PEM, the buffer must
|
|
* contain a null-terminated string.
|
|
* \param keylen Size of \b key in bytes.
|
|
* For PEM data, this includes the terminating null byte,
|
|
* so \p keylen must be equal to `strlen(key) + 1`.
|
|
* \param pwd Optional password for decryption.
|
|
* Pass \c NULL if expecting a non-encrypted key.
|
|
* Pass a string of \p pwdlen bytes if expecting an encrypted
|
|
* key; a non-encrypted key will also be accepted.
|
|
* The empty password is not supported.
|
|
* \param pwdlen Size of the password in bytes.
|
|
* Ignored if \p pwd is \c NULL.
|
|
* \param f_rng RNG function, must not be \c NULL. Used for blinding.
|
|
* \param p_rng RNG parameter
|
|
*
|
|
* \note On entry, ctx must be empty, either freshly initialised
|
|
* with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a
|
|
* specific key type, check the result with mbedtls_pk_can_do().
|
|
*
|
|
* \note The key is also checked for correctness.
|
|
*
|
|
* \return 0 if successful, or a specific PK or PEM error code
|
|
*/
|
|
int mbedtls_pk_parse_key(mbedtls_pk_context *ctx,
|
|
const unsigned char *key, size_t keylen,
|
|
const unsigned char *pwd, size_t pwdlen,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng);
|
|
|
|
/** \ingroup pk_module */
|
|
/**
|
|
* \brief Parse a public key in PEM or DER format
|
|
*
|
|
* \note If #MBEDTLS_USE_PSA_CRYPTO is enabled, the PSA crypto
|
|
* subsystem must have been initialized by calling
|
|
* psa_crypto_init() before calling this function.
|
|
*
|
|
* \param ctx The PK context to fill. It must have been initialized
|
|
* but not set up.
|
|
* \param key Input buffer to parse.
|
|
* The buffer must contain the input exactly, with no
|
|
* extra trailing material. For PEM, the buffer must
|
|
* contain a null-terminated string.
|
|
* \param keylen Size of \b key in bytes.
|
|
* For PEM data, this includes the terminating null byte,
|
|
* so \p keylen must be equal to `strlen(key) + 1`.
|
|
*
|
|
* \note On entry, ctx must be empty, either freshly initialised
|
|
* with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a
|
|
* specific key type, check the result with mbedtls_pk_can_do().
|
|
*
|
|
* \note For compressed points, see #MBEDTLS_ECP_PF_COMPRESSED for
|
|
* limitations.
|
|
*
|
|
* \note The key is also checked for correctness.
|
|
*
|
|
* \return 0 if successful, or a specific PK or PEM error code
|
|
*/
|
|
int mbedtls_pk_parse_public_key(mbedtls_pk_context *ctx,
|
|
const unsigned char *key, size_t keylen);
|
|
|
|
#if defined(MBEDTLS_FS_IO)
|
|
/** \ingroup pk_module */
|
|
/**
|
|
* \brief Load and parse a private key
|
|
*
|
|
* \note If #MBEDTLS_USE_PSA_CRYPTO is enabled, the PSA crypto
|
|
* subsystem must have been initialized by calling
|
|
* psa_crypto_init() before calling this function.
|
|
*
|
|
* \param ctx The PK context to fill. It must have been initialized
|
|
* but not set up.
|
|
* \param path filename to read the private key from
|
|
* \param password Optional password to decrypt the file.
|
|
* Pass \c NULL if expecting a non-encrypted key.
|
|
* Pass a null-terminated string if expecting an encrypted
|
|
* key; a non-encrypted key will also be accepted.
|
|
* The empty password is not supported.
|
|
* \param f_rng RNG function, must not be \c NULL. Used for blinding.
|
|
* \param p_rng RNG parameter
|
|
*
|
|
* \note On entry, ctx must be empty, either freshly initialised
|
|
* with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a
|
|
* specific key type, check the result with mbedtls_pk_can_do().
|
|
*
|
|
* \note The key is also checked for correctness.
|
|
*
|
|
* \return 0 if successful, or a specific PK or PEM error code
|
|
*/
|
|
int mbedtls_pk_parse_keyfile(mbedtls_pk_context *ctx,
|
|
const char *path, const char *password,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng);
|
|
|
|
/** \ingroup pk_module */
|
|
/**
|
|
* \brief Load and parse a public key
|
|
*
|
|
* \param ctx The PK context to fill. It must have been initialized
|
|
* but not set up.
|
|
* \param path filename to read the public key from
|
|
*
|
|
* \note On entry, ctx must be empty, either freshly initialised
|
|
* with mbedtls_pk_init() or reset with mbedtls_pk_free(). If
|
|
* you need a specific key type, check the result with
|
|
* mbedtls_pk_can_do().
|
|
*
|
|
* \note The key is also checked for correctness.
|
|
*
|
|
* \return 0 if successful, or a specific PK or PEM error code
|
|
*/
|
|
int mbedtls_pk_parse_public_keyfile(mbedtls_pk_context *ctx, const char *path);
|
|
#endif /* MBEDTLS_FS_IO */
|
|
#endif /* MBEDTLS_PK_PARSE_C */
|
|
|
|
#if defined(MBEDTLS_PK_WRITE_C)
|
|
/**
|
|
* \brief Write a private key to a PKCS#1 or SEC1 DER structure
|
|
* Note: data is written at the end of the buffer! Use the
|
|
* return value to determine where you should start
|
|
* using the buffer
|
|
*
|
|
* \param ctx PK context which must contain a valid private key.
|
|
* \param buf buffer to write to
|
|
* \param size size of the buffer
|
|
*
|
|
* \return length of data written if successful, or a specific
|
|
* error code
|
|
*/
|
|
int mbedtls_pk_write_key_der(const mbedtls_pk_context *ctx, unsigned char *buf, size_t size);
|
|
|
|
/**
|
|
* \brief Write a public key to a SubjectPublicKeyInfo DER structure
|
|
* Note: data is written at the end of the buffer! Use the
|
|
* return value to determine where you should start
|
|
* using the buffer
|
|
*
|
|
* \param ctx PK context which must contain a valid public or private key.
|
|
* \param buf buffer to write to
|
|
* \param size size of the buffer
|
|
*
|
|
* \return length of data written if successful, or a specific
|
|
* error code
|
|
*/
|
|
int mbedtls_pk_write_pubkey_der(const mbedtls_pk_context *ctx, unsigned char *buf, size_t size);
|
|
|
|
#if defined(MBEDTLS_PEM_WRITE_C)
|
|
/**
|
|
* \brief Write a public key to a PEM string
|
|
*
|
|
* \param ctx PK context which must contain a valid public or private key.
|
|
* \param buf Buffer to write to. The output includes a
|
|
* terminating null byte.
|
|
* \param size Size of the buffer in bytes.
|
|
*
|
|
* \return 0 if successful, or a specific error code
|
|
*/
|
|
int mbedtls_pk_write_pubkey_pem(const mbedtls_pk_context *ctx, unsigned char *buf, size_t size);
|
|
|
|
/**
|
|
* \brief Write a private key to a PKCS#1 or SEC1 PEM string
|
|
*
|
|
* \param ctx PK context which must contain a valid private key.
|
|
* \param buf Buffer to write to. The output includes a
|
|
* terminating null byte.
|
|
* \param size Size of the buffer in bytes.
|
|
*
|
|
* \return 0 if successful, or a specific error code
|
|
*/
|
|
int mbedtls_pk_write_key_pem(const mbedtls_pk_context *ctx, unsigned char *buf, size_t size);
|
|
#endif /* MBEDTLS_PEM_WRITE_C */
|
|
#endif /* MBEDTLS_PK_WRITE_C */
|
|
|
|
/*
|
|
* WARNING: Low-level functions. You probably do not want to use these unless
|
|
* you are certain you do ;)
|
|
*/
|
|
|
|
#if defined(MBEDTLS_PK_PARSE_C)
|
|
/**
|
|
* \brief Parse a SubjectPublicKeyInfo DER structure
|
|
*
|
|
* \param p the position in the ASN.1 data
|
|
* \param end end of the buffer
|
|
* \param pk The PK context to fill. It must have been initialized
|
|
* but not set up.
|
|
*
|
|
* \return 0 if successful, or a specific PK error code
|
|
*/
|
|
int mbedtls_pk_parse_subpubkey(unsigned char **p, const unsigned char *end,
|
|
mbedtls_pk_context *pk);
|
|
#endif /* MBEDTLS_PK_PARSE_C */
|
|
|
|
#if defined(MBEDTLS_PK_WRITE_C)
|
|
/**
|
|
* \brief Write a subjectPublicKey to ASN.1 data
|
|
* Note: function works backwards in data buffer
|
|
*
|
|
* \param p reference to current position pointer
|
|
* \param start start of the buffer (for bounds-checking)
|
|
* \param key PK context which must contain a valid public or private key.
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*
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* \return the length written or a negative error code
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*/
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int mbedtls_pk_write_pubkey(unsigned char **p, unsigned char *start,
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const mbedtls_pk_context *key);
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#endif /* MBEDTLS_PK_WRITE_C */
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#ifdef __cplusplus
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}
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#endif
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#endif /* MBEDTLS_PK_H */
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