622 lines
20 KiB
C
622 lines
20 KiB
C
/*
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* Public Key layer for writing key files and structures
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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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#include "common.h"
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#if defined(MBEDTLS_PK_WRITE_C)
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#include "mbedtls/pk.h"
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#include "mbedtls/asn1write.h"
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#include "mbedtls/oid.h"
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#include "mbedtls/platform_util.h"
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#include "mbedtls/error.h"
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#include "pk_internal.h"
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#include <string.h>
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#if defined(MBEDTLS_ECP_C)
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#include "mbedtls/bignum.h"
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#include "mbedtls/ecp.h"
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#include "mbedtls/platform_util.h"
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#endif
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#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
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#include "pk_internal.h"
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#endif
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#if defined(MBEDTLS_RSA_C) || defined(MBEDTLS_PK_HAVE_ECC_KEYS)
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#include "pkwrite.h"
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#endif
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#if defined(MBEDTLS_PEM_WRITE_C)
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#include "mbedtls/pem.h"
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#endif
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#if defined(MBEDTLS_RSA_C)
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#include "rsa_internal.h"
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#endif
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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#include "psa/crypto.h"
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#include "psa_util_internal.h"
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#endif
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#include "mbedtls/platform.h"
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/* Helpers for properly sizing buffers aimed at holding public keys or
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* key-pairs based on build symbols. */
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#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
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#define PK_MAX_EC_PUBLIC_KEY_SIZE PSA_EXPORT_PUBLIC_KEY_MAX_SIZE
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#define PK_MAX_EC_KEY_PAIR_SIZE MBEDTLS_PSA_MAX_EC_KEY_PAIR_LENGTH
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#elif defined(MBEDTLS_USE_PSA_CRYPTO)
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#define PK_MAX_EC_PUBLIC_KEY_SIZE PSA_EXPORT_PUBLIC_KEY_MAX_SIZE
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#define PK_MAX_EC_KEY_PAIR_SIZE MBEDTLS_PSA_MAX_EC_KEY_PAIR_LENGTH
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#else
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#define PK_MAX_EC_PUBLIC_KEY_SIZE MBEDTLS_ECP_MAX_PT_LEN
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#define PK_MAX_EC_KEY_PAIR_SIZE MBEDTLS_ECP_MAX_BYTES
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#endif
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/******************************************************************************
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* Internal functions for RSA keys.
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******************************************************************************/
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#if defined(MBEDTLS_RSA_C)
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static int pk_write_rsa_der(unsigned char **p, unsigned char *buf,
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const mbedtls_pk_context *pk)
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{
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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if (mbedtls_pk_get_type(pk) == MBEDTLS_PK_OPAQUE) {
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uint8_t tmp[PSA_EXPORT_KEY_PAIR_MAX_SIZE];
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size_t len = 0, tmp_len = 0;
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if (psa_export_key(pk->priv_id, tmp, sizeof(tmp), &tmp_len) != PSA_SUCCESS) {
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return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
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}
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*p -= tmp_len;
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memcpy(*p, tmp, tmp_len);
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len += tmp_len;
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mbedtls_platform_zeroize(tmp, sizeof(tmp));
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return (int) len;
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}
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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return mbedtls_rsa_write_key(mbedtls_pk_rsa(*pk), buf, p);
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}
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#endif /* MBEDTLS_RSA_C */
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/******************************************************************************
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* Internal functions for EC keys.
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******************************************************************************/
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#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
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#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
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static int pk_write_ec_pubkey(unsigned char **p, unsigned char *start,
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const mbedtls_pk_context *pk)
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{
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size_t len = 0;
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uint8_t buf[PK_MAX_EC_PUBLIC_KEY_SIZE];
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if (mbedtls_pk_get_type(pk) == MBEDTLS_PK_OPAQUE) {
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if (psa_export_public_key(pk->priv_id, buf, sizeof(buf), &len) != PSA_SUCCESS) {
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return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
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}
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} else {
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len = pk->pub_raw_len;
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memcpy(buf, pk->pub_raw, len);
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}
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if (*p < start || (size_t) (*p - start) < len) {
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return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
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}
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*p -= len;
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memcpy(*p, buf, len);
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return (int) len;
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}
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#else /* MBEDTLS_PK_USE_PSA_EC_DATA */
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static int pk_write_ec_pubkey(unsigned char **p, unsigned char *start,
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const mbedtls_pk_context *pk)
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{
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size_t len = 0;
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unsigned char buf[PK_MAX_EC_PUBLIC_KEY_SIZE];
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mbedtls_ecp_keypair *ec = mbedtls_pk_ec(*pk);
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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if (mbedtls_pk_get_type(pk) == MBEDTLS_PK_OPAQUE) {
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if (psa_export_public_key(pk->priv_id, buf, sizeof(buf), &len) != PSA_SUCCESS) {
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return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
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}
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*p -= len;
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memcpy(*p, buf, len);
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return (int) len;
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} else
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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{
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if ((ret = mbedtls_ecp_point_write_binary(&ec->grp, &ec->Q,
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MBEDTLS_ECP_PF_UNCOMPRESSED,
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&len, buf, sizeof(buf))) != 0) {
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return ret;
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}
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}
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if (*p < start || (size_t) (*p - start) < len) {
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return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
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}
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*p -= len;
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memcpy(*p, buf, len);
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return (int) len;
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}
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#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
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/*
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* privateKey OCTET STRING -- always of length ceil(log2(n)/8)
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*/
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#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
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static int pk_write_ec_private(unsigned char **p, unsigned char *start,
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const mbedtls_pk_context *pk)
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{
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size_t byte_length;
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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unsigned char tmp[PK_MAX_EC_KEY_PAIR_SIZE];
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psa_status_t status;
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if (mbedtls_pk_get_type(pk) == MBEDTLS_PK_OPAQUE) {
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status = psa_export_key(pk->priv_id, tmp, sizeof(tmp), &byte_length);
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if (status != PSA_SUCCESS) {
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ret = PSA_PK_ECDSA_TO_MBEDTLS_ERR(status);
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return ret;
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}
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} else {
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status = psa_export_key(pk->priv_id, tmp, sizeof(tmp), &byte_length);
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if (status != PSA_SUCCESS) {
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ret = PSA_PK_ECDSA_TO_MBEDTLS_ERR(status);
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goto exit;
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}
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}
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ret = mbedtls_asn1_write_octet_string(p, start, tmp, byte_length);
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exit:
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mbedtls_platform_zeroize(tmp, sizeof(tmp));
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return ret;
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}
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#else /* MBEDTLS_PK_USE_PSA_EC_DATA */
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static int pk_write_ec_private(unsigned char **p, unsigned char *start,
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const mbedtls_pk_context *pk)
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{
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size_t byte_length;
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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unsigned char tmp[PK_MAX_EC_KEY_PAIR_SIZE];
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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psa_status_t status;
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if (mbedtls_pk_get_type(pk) == MBEDTLS_PK_OPAQUE) {
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status = psa_export_key(pk->priv_id, tmp, sizeof(tmp), &byte_length);
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if (status != PSA_SUCCESS) {
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ret = PSA_PK_ECDSA_TO_MBEDTLS_ERR(status);
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return ret;
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}
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} else
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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{
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mbedtls_ecp_keypair *ec = mbedtls_pk_ec_rw(*pk);
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byte_length = (ec->grp.pbits + 7) / 8;
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ret = mbedtls_ecp_write_key_ext(ec, &byte_length, tmp, sizeof(tmp));
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if (ret != 0) {
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goto exit;
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}
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}
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ret = mbedtls_asn1_write_octet_string(p, start, tmp, byte_length);
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exit:
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mbedtls_platform_zeroize(tmp, sizeof(tmp));
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return ret;
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}
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#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
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/*
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* ECParameters ::= CHOICE {
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* namedCurve OBJECT IDENTIFIER
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* }
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*/
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static int pk_write_ec_param(unsigned char **p, unsigned char *start,
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mbedtls_ecp_group_id grp_id)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t len = 0;
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const char *oid;
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size_t oid_len;
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if ((ret = mbedtls_oid_get_oid_by_ec_grp(grp_id, &oid, &oid_len)) != 0) {
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return ret;
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}
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_oid(p, start, oid, oid_len));
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return (int) len;
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}
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#if defined(MBEDTLS_PK_HAVE_RFC8410_CURVES)
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/*
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* RFC8410 section 7
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*
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* OneAsymmetricKey ::= SEQUENCE {
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* version Version,
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* privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
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* privateKey PrivateKey,
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* attributes [0] IMPLICIT Attributes OPTIONAL,
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* ...,
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* [[2: publicKey [1] IMPLICIT PublicKey OPTIONAL ]],
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* ...
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* }
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* ...
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* CurvePrivateKey ::= OCTET STRING
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*/
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static int pk_write_ec_rfc8410_der(unsigned char **p, unsigned char *buf,
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const mbedtls_pk_context *pk)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t len = 0;
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size_t oid_len = 0;
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const char *oid;
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mbedtls_ecp_group_id grp_id;
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/* privateKey */
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MBEDTLS_ASN1_CHK_ADD(len, pk_write_ec_private(p, buf, pk));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, buf, len));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, buf, MBEDTLS_ASN1_OCTET_STRING));
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grp_id = mbedtls_pk_get_ec_group_id(pk);
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/* privateKeyAlgorithm */
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if ((ret = mbedtls_oid_get_oid_by_ec_grp_algid(grp_id, &oid, &oid_len)) != 0) {
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return ret;
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}
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MBEDTLS_ASN1_CHK_ADD(len,
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mbedtls_asn1_write_algorithm_identifier_ext(p, buf, oid, oid_len, 0, 0));
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/* version */
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_int(p, buf, 0));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, buf, len));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, buf, MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE));
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return (int) len;
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}
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#endif /* MBEDTLS_PK_HAVE_RFC8410_CURVES */
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/*
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* RFC 5915, or SEC1 Appendix C.4
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*
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* ECPrivateKey ::= SEQUENCE {
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* version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
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* privateKey OCTET STRING,
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* parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
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* publicKey [1] BIT STRING OPTIONAL
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* }
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*/
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static int pk_write_ec_der(unsigned char **p, unsigned char *buf,
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const mbedtls_pk_context *pk)
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{
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size_t len = 0;
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int ret;
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size_t pub_len = 0, par_len = 0;
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mbedtls_ecp_group_id grp_id;
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/* publicKey */
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MBEDTLS_ASN1_CHK_ADD(pub_len, pk_write_ec_pubkey(p, buf, pk));
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if (*p - buf < 1) {
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return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
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}
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(*p)--;
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**p = 0;
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pub_len += 1;
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MBEDTLS_ASN1_CHK_ADD(pub_len, mbedtls_asn1_write_len(p, buf, pub_len));
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MBEDTLS_ASN1_CHK_ADD(pub_len, mbedtls_asn1_write_tag(p, buf, MBEDTLS_ASN1_BIT_STRING));
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MBEDTLS_ASN1_CHK_ADD(pub_len, mbedtls_asn1_write_len(p, buf, pub_len));
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MBEDTLS_ASN1_CHK_ADD(pub_len, mbedtls_asn1_write_tag(p, buf,
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MBEDTLS_ASN1_CONTEXT_SPECIFIC |
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MBEDTLS_ASN1_CONSTRUCTED | 1));
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len += pub_len;
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/* parameters */
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grp_id = mbedtls_pk_get_ec_group_id(pk);
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MBEDTLS_ASN1_CHK_ADD(par_len, pk_write_ec_param(p, buf, grp_id));
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MBEDTLS_ASN1_CHK_ADD(par_len, mbedtls_asn1_write_len(p, buf, par_len));
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MBEDTLS_ASN1_CHK_ADD(par_len, mbedtls_asn1_write_tag(p, buf,
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MBEDTLS_ASN1_CONTEXT_SPECIFIC |
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MBEDTLS_ASN1_CONSTRUCTED | 0));
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len += par_len;
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/* privateKey */
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MBEDTLS_ASN1_CHK_ADD(len, pk_write_ec_private(p, buf, pk));
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/* version */
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_int(p, buf, 1));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, buf, len));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, buf, MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE));
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return (int) len;
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}
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#endif /* MBEDTLS_PK_HAVE_ECC_KEYS */
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/******************************************************************************
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* Internal functions for Opaque keys.
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******************************************************************************/
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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static int pk_write_opaque_pubkey(unsigned char **p, unsigned char *start,
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const mbedtls_pk_context *pk)
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{
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size_t buffer_size;
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size_t len = 0;
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if (*p < start) {
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return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
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}
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buffer_size = (size_t) (*p - start);
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if (psa_export_public_key(pk->priv_id, start, buffer_size,
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&len) != PSA_SUCCESS) {
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return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
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}
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*p -= len;
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memmove(*p, start, len);
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return (int) len;
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}
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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/******************************************************************************
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* Generic helpers
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******************************************************************************/
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/* Extend the public mbedtls_pk_get_type() by getting key type also in case of
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* opaque keys. */
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static mbedtls_pk_type_t pk_get_type_ext(const mbedtls_pk_context *pk)
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{
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mbedtls_pk_type_t pk_type = mbedtls_pk_get_type(pk);
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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if (pk_type == MBEDTLS_PK_OPAQUE) {
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psa_key_attributes_t opaque_attrs = PSA_KEY_ATTRIBUTES_INIT;
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psa_key_type_t opaque_key_type;
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if (psa_get_key_attributes(pk->priv_id, &opaque_attrs) != PSA_SUCCESS) {
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return MBEDTLS_PK_NONE;
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}
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opaque_key_type = psa_get_key_type(&opaque_attrs);
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psa_reset_key_attributes(&opaque_attrs);
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if (PSA_KEY_TYPE_IS_ECC(opaque_key_type)) {
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return MBEDTLS_PK_ECKEY;
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} else if (PSA_KEY_TYPE_IS_RSA(opaque_key_type)) {
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return MBEDTLS_PK_RSA;
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} else {
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return MBEDTLS_PK_NONE;
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}
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} else
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#endif
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return pk_type;
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}
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/******************************************************************************
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* Public functions for writing private/public DER keys.
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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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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t len = 0;
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#if defined(MBEDTLS_RSA_C)
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if (mbedtls_pk_get_type(key) == MBEDTLS_PK_RSA) {
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_rsa_write_pubkey(mbedtls_pk_rsa(*key), start, p));
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} else
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#endif
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#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
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if (mbedtls_pk_get_type(key) == MBEDTLS_PK_ECKEY) {
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MBEDTLS_ASN1_CHK_ADD(len, pk_write_ec_pubkey(p, start, key));
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} else
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#endif
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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if (mbedtls_pk_get_type(key) == MBEDTLS_PK_OPAQUE) {
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MBEDTLS_ASN1_CHK_ADD(len, pk_write_opaque_pubkey(p, start, key));
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} else
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
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return (int) len;
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}
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int mbedtls_pk_write_pubkey_der(const mbedtls_pk_context *key, unsigned char *buf, size_t size)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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unsigned char *c;
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int has_par = 1;
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size_t len = 0, par_len = 0, oid_len = 0;
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mbedtls_pk_type_t pk_type;
|
|
const char *oid = NULL;
|
|
|
|
if (size == 0) {
|
|
return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
|
|
}
|
|
|
|
c = buf + size;
|
|
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_pk_write_pubkey(&c, buf, key));
|
|
|
|
if (c - buf < 1) {
|
|
return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
|
|
}
|
|
|
|
/*
|
|
* SubjectPublicKeyInfo ::= SEQUENCE {
|
|
* algorithm AlgorithmIdentifier,
|
|
* subjectPublicKey BIT STRING }
|
|
*/
|
|
*--c = 0;
|
|
len += 1;
|
|
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&c, buf, len));
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(&c, buf, MBEDTLS_ASN1_BIT_STRING));
|
|
|
|
pk_type = pk_get_type_ext(key);
|
|
|
|
#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
|
|
if (pk_get_type_ext(key) == MBEDTLS_PK_ECKEY) {
|
|
mbedtls_ecp_group_id ec_grp_id = mbedtls_pk_get_ec_group_id(key);
|
|
if (MBEDTLS_PK_IS_RFC8410_GROUP_ID(ec_grp_id)) {
|
|
ret = mbedtls_oid_get_oid_by_ec_grp_algid(ec_grp_id, &oid, &oid_len);
|
|
if (ret != 0) {
|
|
return ret;
|
|
}
|
|
has_par = 0;
|
|
} else {
|
|
MBEDTLS_ASN1_CHK_ADD(par_len, pk_write_ec_param(&c, buf, ec_grp_id));
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_PK_HAVE_ECC_KEYS */
|
|
|
|
/* At this point oid_len is not null only for EC Montgomery keys. */
|
|
if (oid_len == 0) {
|
|
ret = mbedtls_oid_get_oid_by_pk_alg(pk_type, &oid, &oid_len);
|
|
if (ret != 0) {
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_algorithm_identifier_ext(&c, buf, oid, oid_len,
|
|
par_len, has_par));
|
|
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&c, buf, len));
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(&c, buf, MBEDTLS_ASN1_CONSTRUCTED |
|
|
MBEDTLS_ASN1_SEQUENCE));
|
|
|
|
return (int) len;
|
|
}
|
|
|
|
int mbedtls_pk_write_key_der(const mbedtls_pk_context *key, unsigned char *buf, size_t size)
|
|
{
|
|
unsigned char *c;
|
|
|
|
if (size == 0) {
|
|
return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
|
|
}
|
|
|
|
c = buf + size;
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
if (pk_get_type_ext(key) == MBEDTLS_PK_RSA) {
|
|
return pk_write_rsa_der(&c, buf, key);
|
|
} else
|
|
#endif /* MBEDTLS_RSA_C */
|
|
#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
|
|
if (pk_get_type_ext(key) == MBEDTLS_PK_ECKEY) {
|
|
#if defined(MBEDTLS_PK_HAVE_RFC8410_CURVES)
|
|
if (mbedtls_pk_is_rfc8410(key)) {
|
|
return pk_write_ec_rfc8410_der(&c, buf, key);
|
|
}
|
|
#endif /* MBEDTLS_PK_HAVE_RFC8410_CURVES */
|
|
return pk_write_ec_der(&c, buf, key);
|
|
} else
|
|
#endif /* MBEDTLS_PK_HAVE_ECC_KEYS */
|
|
return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
|
|
}
|
|
|
|
/******************************************************************************
|
|
* Public functions for wrinting private/public PEM keys.
|
|
******************************************************************************/
|
|
#if defined(MBEDTLS_PEM_WRITE_C)
|
|
|
|
#define PUB_DER_MAX_BYTES \
|
|
(MBEDTLS_PK_RSA_PUB_DER_MAX_BYTES > MBEDTLS_PK_ECP_PUB_DER_MAX_BYTES ? \
|
|
MBEDTLS_PK_RSA_PUB_DER_MAX_BYTES : MBEDTLS_PK_ECP_PUB_DER_MAX_BYTES)
|
|
#define PRV_DER_MAX_BYTES \
|
|
(MBEDTLS_PK_RSA_PRV_DER_MAX_BYTES > MBEDTLS_PK_ECP_PRV_DER_MAX_BYTES ? \
|
|
MBEDTLS_PK_RSA_PRV_DER_MAX_BYTES : MBEDTLS_PK_ECP_PRV_DER_MAX_BYTES)
|
|
|
|
int mbedtls_pk_write_pubkey_pem(const mbedtls_pk_context *key, unsigned char *buf, size_t size)
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
unsigned char *output_buf = NULL;
|
|
output_buf = mbedtls_calloc(1, PUB_DER_MAX_BYTES);
|
|
if (output_buf == NULL) {
|
|
return MBEDTLS_ERR_PK_ALLOC_FAILED;
|
|
}
|
|
size_t olen = 0;
|
|
|
|
if ((ret = mbedtls_pk_write_pubkey_der(key, output_buf,
|
|
PUB_DER_MAX_BYTES)) < 0) {
|
|
goto cleanup;
|
|
}
|
|
|
|
if ((ret = mbedtls_pem_write_buffer(PEM_BEGIN_PUBLIC_KEY "\n", PEM_END_PUBLIC_KEY "\n",
|
|
output_buf + PUB_DER_MAX_BYTES - ret,
|
|
ret, buf, size, &olen)) != 0) {
|
|
goto cleanup;
|
|
}
|
|
|
|
ret = 0;
|
|
cleanup:
|
|
mbedtls_free(output_buf);
|
|
return ret;
|
|
}
|
|
|
|
int mbedtls_pk_write_key_pem(const mbedtls_pk_context *key, unsigned char *buf, size_t size)
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
unsigned char *output_buf = NULL;
|
|
output_buf = mbedtls_calloc(1, PRV_DER_MAX_BYTES);
|
|
if (output_buf == NULL) {
|
|
return MBEDTLS_ERR_PK_ALLOC_FAILED;
|
|
}
|
|
const char *begin, *end;
|
|
size_t olen = 0;
|
|
|
|
if ((ret = mbedtls_pk_write_key_der(key, output_buf, PRV_DER_MAX_BYTES)) < 0) {
|
|
goto cleanup;
|
|
}
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
if (pk_get_type_ext(key) == MBEDTLS_PK_RSA) {
|
|
begin = PEM_BEGIN_PRIVATE_KEY_RSA "\n";
|
|
end = PEM_END_PRIVATE_KEY_RSA "\n";
|
|
} else
|
|
#endif
|
|
#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
|
|
if (pk_get_type_ext(key) == MBEDTLS_PK_ECKEY) {
|
|
if (mbedtls_pk_is_rfc8410(key)) {
|
|
begin = PEM_BEGIN_PRIVATE_KEY_PKCS8 "\n";
|
|
end = PEM_END_PRIVATE_KEY_PKCS8 "\n";
|
|
} else {
|
|
begin = PEM_BEGIN_PRIVATE_KEY_EC "\n";
|
|
end = PEM_END_PRIVATE_KEY_EC "\n";
|
|
}
|
|
} else
|
|
#endif /* MBEDTLS_PK_HAVE_ECC_KEYS */
|
|
{
|
|
ret = MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
|
|
goto cleanup;
|
|
}
|
|
|
|
if ((ret = mbedtls_pem_write_buffer(begin, end,
|
|
output_buf + PRV_DER_MAX_BYTES - ret,
|
|
ret, buf, size, &olen)) != 0) {
|
|
goto cleanup;
|
|
}
|
|
|
|
ret = 0;
|
|
cleanup:
|
|
mbedtls_zeroize_and_free(output_buf, PRV_DER_MAX_BYTES);
|
|
return ret;
|
|
}
|
|
#endif /* MBEDTLS_PEM_WRITE_C */
|
|
|
|
#endif /* MBEDTLS_PK_WRITE_C */
|