241 lines
9.4 KiB
C++
241 lines
9.4 KiB
C++
/**
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* \file pkcs7.h
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*
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* \brief PKCS #7 generic defines and structures
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* https://tools.ietf.org/html/rfc2315
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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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/**
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* Note: For the time being, this implementation of the PKCS #7 cryptographic
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* message syntax is a partial implementation of RFC 2315.
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* Differences include:
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* - The RFC specifies 6 different content types. The only type currently
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* supported in Mbed TLS is the signed-data content type.
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* - The only supported PKCS #7 Signed Data syntax version is version 1
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* - The RFC specifies support for BER. This implementation is limited to
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* DER only.
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* - The RFC specifies that multiple digest algorithms can be specified
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* in the Signed Data type. Only one digest algorithm is supported in Mbed TLS.
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* - The RFC specifies the Signed Data type can contain multiple X.509 or PKCS #6 extended
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* certificates. In Mbed TLS, this list can only contain 0 or 1 certificates
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* and they must be in X.509 format.
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* - The RFC specifies the Signed Data type can contain
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* certificate-revocation lists (CRLs). This implementation has no support
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* for CRLs so it is assumed to be an empty list.
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* - The RFC allows for SignerInfo structure to optionally contain
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* unauthenticatedAttributes and authenticatedAttributes. In Mbed TLS it is
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* assumed these fields are empty.
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* - The RFC allows for the signed Data type to contain contentInfo. This
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* implementation assumes the type is DATA and the content is empty.
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*/
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#ifndef MBEDTLS_PKCS7_H
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#define MBEDTLS_PKCS7_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/asn1.h"
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#include "mbedtls/x509_crt.h"
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/**
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* \name PKCS #7 Module Error codes
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* \{
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*/
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#define MBEDTLS_ERR_PKCS7_INVALID_FORMAT -0x5300 /**< The format is invalid, e.g. different type expected. */
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#define MBEDTLS_ERR_PKCS7_FEATURE_UNAVAILABLE -0x5380 /**< Unavailable feature, e.g. anything other than signed data. */
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#define MBEDTLS_ERR_PKCS7_INVALID_VERSION -0x5400 /**< The PKCS #7 version element is invalid or cannot be parsed. */
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#define MBEDTLS_ERR_PKCS7_INVALID_CONTENT_INFO -0x5480 /**< The PKCS #7 content info is invalid or cannot be parsed. */
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#define MBEDTLS_ERR_PKCS7_INVALID_ALG -0x5500 /**< The algorithm tag or value is invalid or cannot be parsed. */
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#define MBEDTLS_ERR_PKCS7_INVALID_CERT -0x5580 /**< The certificate tag or value is invalid or cannot be parsed. */
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#define MBEDTLS_ERR_PKCS7_INVALID_SIGNATURE -0x5600 /**< Error parsing the signature */
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#define MBEDTLS_ERR_PKCS7_INVALID_SIGNER_INFO -0x5680 /**< Error parsing the signer's info */
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#define MBEDTLS_ERR_PKCS7_BAD_INPUT_DATA -0x5700 /**< Input invalid. */
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#define MBEDTLS_ERR_PKCS7_ALLOC_FAILED -0x5780 /**< Allocation of memory failed. */
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#define MBEDTLS_ERR_PKCS7_VERIFY_FAIL -0x5800 /**< Verification Failed */
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#define MBEDTLS_ERR_PKCS7_CERT_DATE_INVALID -0x5880 /**< The PKCS #7 date issued/expired dates are invalid */
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/* \} name */
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/**
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* \name PKCS #7 Supported Version
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* \{
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*/
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#define MBEDTLS_PKCS7_SUPPORTED_VERSION 0x01
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/* \} name */
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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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* Type-length-value structure that allows for ASN.1 using DER.
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*/
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typedef mbedtls_asn1_buf mbedtls_pkcs7_buf;
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/**
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* Container for ASN.1 named information objects.
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* It allows for Relative Distinguished Names (e.g. cn=localhost,ou=code,etc.).
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*/
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typedef mbedtls_asn1_named_data mbedtls_pkcs7_name;
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/**
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* Container for a sequence of ASN.1 items
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*/
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typedef mbedtls_asn1_sequence mbedtls_pkcs7_sequence;
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/**
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* PKCS #7 types
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*/
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typedef enum {
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MBEDTLS_PKCS7_NONE=0,
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MBEDTLS_PKCS7_DATA,
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MBEDTLS_PKCS7_SIGNED_DATA,
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MBEDTLS_PKCS7_ENVELOPED_DATA,
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MBEDTLS_PKCS7_SIGNED_AND_ENVELOPED_DATA,
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MBEDTLS_PKCS7_DIGESTED_DATA,
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MBEDTLS_PKCS7_ENCRYPTED_DATA,
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}
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mbedtls_pkcs7_type;
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/**
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* Structure holding PKCS #7 signer info
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*/
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typedef struct mbedtls_pkcs7_signer_info {
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int MBEDTLS_PRIVATE(version);
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mbedtls_x509_buf MBEDTLS_PRIVATE(serial);
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mbedtls_x509_name MBEDTLS_PRIVATE(issuer);
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mbedtls_x509_buf MBEDTLS_PRIVATE(issuer_raw);
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mbedtls_x509_buf MBEDTLS_PRIVATE(alg_identifier);
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mbedtls_x509_buf MBEDTLS_PRIVATE(sig_alg_identifier);
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mbedtls_x509_buf MBEDTLS_PRIVATE(sig);
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struct mbedtls_pkcs7_signer_info *MBEDTLS_PRIVATE(next);
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}
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mbedtls_pkcs7_signer_info;
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/**
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* Structure holding the signed data section
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*/
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typedef struct mbedtls_pkcs7_signed_data {
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int MBEDTLS_PRIVATE(version);
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mbedtls_pkcs7_buf MBEDTLS_PRIVATE(digest_alg_identifiers);
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int MBEDTLS_PRIVATE(no_of_certs);
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mbedtls_x509_crt MBEDTLS_PRIVATE(certs);
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int MBEDTLS_PRIVATE(no_of_crls);
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mbedtls_x509_crl MBEDTLS_PRIVATE(crl);
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int MBEDTLS_PRIVATE(no_of_signers);
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mbedtls_pkcs7_signer_info MBEDTLS_PRIVATE(signers);
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}
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mbedtls_pkcs7_signed_data;
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/**
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* Structure holding PKCS #7 structure, only signed data for now
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*/
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typedef struct mbedtls_pkcs7 {
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mbedtls_pkcs7_buf MBEDTLS_PRIVATE(raw);
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mbedtls_pkcs7_signed_data MBEDTLS_PRIVATE(signed_data);
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}
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mbedtls_pkcs7;
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/**
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* \brief Initialize mbedtls_pkcs7 structure.
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*
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* \param pkcs7 mbedtls_pkcs7 structure.
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*/
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void mbedtls_pkcs7_init(mbedtls_pkcs7 *pkcs7);
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/**
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* \brief Parse a single DER formatted PKCS #7 detached signature.
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*
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* \param pkcs7 The mbedtls_pkcs7 structure to be filled by the parser.
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* \param buf The buffer holding only the DER encoded PKCS #7 content.
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* \param buflen The size in bytes of \p buf. The size must be exactly the
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* length of the DER encoded PKCS #7 content.
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*
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* \note This function makes an internal copy of the PKCS #7 buffer
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* \p buf. In particular, \p buf may be destroyed or reused
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* after this call returns.
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* \note Signatures with internal data are not supported.
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*
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* \return The \c mbedtls_pkcs7_type of \p buf, if successful.
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* \return A negative error code on failure.
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*/
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int mbedtls_pkcs7_parse_der(mbedtls_pkcs7 *pkcs7, const unsigned char *buf,
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const size_t buflen);
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/**
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* \brief Verification of PKCS #7 signature against a caller-supplied
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* certificate.
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*
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* For each signer in the PKCS structure, this function computes
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* a signature over the supplied data, using the supplied
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* certificate and the same digest algorithm as specified by the
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* signer. It then compares this signature against the
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* signer's signature; verification succeeds if any comparison
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* matches.
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*
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* This function does not use the certificates held within the
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* PKCS #7 structure itself, and does not check that the
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* certificate is signed by a trusted certification authority.
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*
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* \param pkcs7 mbedtls_pkcs7 structure containing signature.
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* \param cert Certificate containing key to verify signature.
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* \param data Plain data on which signature has to be verified.
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* \param datalen Length of the data.
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*
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* \note This function internally calculates the hash on the supplied
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* plain data for signature verification.
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*
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* \return 0 if the signature verifies, or a negative error code on failure.
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*/
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int mbedtls_pkcs7_signed_data_verify(mbedtls_pkcs7 *pkcs7,
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const mbedtls_x509_crt *cert,
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const unsigned char *data,
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size_t datalen);
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/**
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* \brief Verification of PKCS #7 signature against a caller-supplied
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* certificate.
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*
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* For each signer in the PKCS structure, this function
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* validates a signature over the supplied hash, using the
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* supplied certificate and the same digest algorithm as
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* specified by the signer. Verification succeeds if any
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* signature is good.
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*
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* This function does not use the certificates held within the
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* PKCS #7 structure itself, and does not check that the
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* certificate is signed by a trusted certification authority.
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*
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* \param pkcs7 PKCS #7 structure containing signature.
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* \param cert Certificate containing key to verify signature.
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* \param hash Hash of the plain data on which signature has to be verified.
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* \param hashlen Length of the hash.
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*
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* \note This function is different from mbedtls_pkcs7_signed_data_verify()
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* in that it is directly passed the hash of the data.
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*
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* \return 0 if the signature verifies, or a negative error code on failure.
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*/
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int mbedtls_pkcs7_signed_hash_verify(mbedtls_pkcs7 *pkcs7,
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const mbedtls_x509_crt *cert,
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const unsigned char *hash, size_t hashlen);
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/**
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* \brief Unallocate all PKCS #7 data and zeroize the memory.
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* It doesn't free \p pkcs7 itself. This should be done by the caller.
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*
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* \param pkcs7 mbedtls_pkcs7 structure to free.
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*/
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void mbedtls_pkcs7_free(mbedtls_pkcs7 *pkcs7);
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#ifdef __cplusplus
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}
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#endif
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#endif /* pkcs7.h */
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