| /* |
| * PSA hashing layer on top of Mbed TLS software crypto |
| */ |
| /* |
| * Copyright The Mbed TLS Contributors |
| * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later |
| */ |
| |
| #include "common.h" |
| |
| /* This is needed for MBEDTLS_ERR_XXX macros */ |
| #include <mbedtls/error.h> |
| |
| #if defined(MBEDTLS_ASN1_WRITE_C) |
| #include <mbedtls/asn1write.h> |
| #include <psa/crypto_sizes.h> |
| #endif |
| |
| #include "psa_util_internal.h" |
| |
| #if defined(MBEDTLS_PSA_CRYPTO_CLIENT) |
| |
| #include <psa/crypto.h> |
| |
| #if defined(MBEDTLS_MD_LIGHT) |
| #include <mbedtls/md.h> |
| #endif |
| #if defined(MBEDTLS_LMS_C) |
| #include <mbedtls/lms.h> |
| #endif |
| #if defined(MBEDTLS_SSL_TLS_C) && \ |
| (defined(MBEDTLS_USE_PSA_CRYPTO) || defined(MBEDTLS_SSL_PROTO_TLS1_3)) |
| #include <mbedtls/ssl.h> |
| #endif |
| #if defined(PSA_WANT_KEY_TYPE_RSA_PUBLIC_KEY) || \ |
| defined(PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_BASIC) |
| #include <mbedtls/rsa.h> |
| #endif |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) && \ |
| defined(PSA_WANT_KEY_TYPE_ECC_PUBLIC_KEY) |
| #include <mbedtls/ecp.h> |
| #endif |
| #if defined(MBEDTLS_PK_C) |
| #include <mbedtls/pk.h> |
| #endif |
| #if defined(MBEDTLS_BLOCK_CIPHER_SOME_PSA) |
| #include <mbedtls/cipher.h> |
| #endif |
| #include <mbedtls/entropy.h> |
| |
| /* PSA_SUCCESS is kept at the top of each error table since |
| * it's the most common status when everything functions properly. */ |
| #if defined(MBEDTLS_MD_LIGHT) |
| const mbedtls_error_pair_t psa_to_md_errors[] = |
| { |
| { PSA_SUCCESS, 0 }, |
| { PSA_ERROR_NOT_SUPPORTED, MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE }, |
| { PSA_ERROR_INVALID_ARGUMENT, MBEDTLS_ERR_MD_BAD_INPUT_DATA }, |
| { PSA_ERROR_INSUFFICIENT_MEMORY, MBEDTLS_ERR_MD_ALLOC_FAILED } |
| }; |
| #endif |
| |
| #if defined(MBEDTLS_BLOCK_CIPHER_SOME_PSA) |
| const mbedtls_error_pair_t psa_to_cipher_errors[] = |
| { |
| { PSA_SUCCESS, 0 }, |
| { PSA_ERROR_NOT_SUPPORTED, MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE }, |
| { PSA_ERROR_INVALID_ARGUMENT, MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA }, |
| { PSA_ERROR_INSUFFICIENT_MEMORY, MBEDTLS_ERR_CIPHER_ALLOC_FAILED } |
| }; |
| #endif |
| |
| #if defined(MBEDTLS_LMS_C) |
| const mbedtls_error_pair_t psa_to_lms_errors[] = |
| { |
| { PSA_SUCCESS, 0 }, |
| { PSA_ERROR_BUFFER_TOO_SMALL, MBEDTLS_ERR_LMS_BUFFER_TOO_SMALL }, |
| { PSA_ERROR_INVALID_ARGUMENT, MBEDTLS_ERR_LMS_BAD_INPUT_DATA } |
| }; |
| #endif |
| |
| #if defined(MBEDTLS_SSL_TLS_C) && \ |
| (defined(MBEDTLS_USE_PSA_CRYPTO) || defined(MBEDTLS_SSL_PROTO_TLS1_3)) |
| const mbedtls_error_pair_t psa_to_ssl_errors[] = |
| { |
| { PSA_SUCCESS, 0 }, |
| { PSA_ERROR_INSUFFICIENT_MEMORY, MBEDTLS_ERR_SSL_ALLOC_FAILED }, |
| { PSA_ERROR_NOT_SUPPORTED, MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE }, |
| { PSA_ERROR_INVALID_SIGNATURE, MBEDTLS_ERR_SSL_INVALID_MAC }, |
| { PSA_ERROR_INVALID_ARGUMENT, MBEDTLS_ERR_SSL_BAD_INPUT_DATA }, |
| { PSA_ERROR_BAD_STATE, MBEDTLS_ERR_SSL_INTERNAL_ERROR }, |
| { PSA_ERROR_BUFFER_TOO_SMALL, MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL } |
| }; |
| #endif |
| |
| #if defined(PSA_WANT_KEY_TYPE_RSA_PUBLIC_KEY) || \ |
| defined(PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_BASIC) |
| const mbedtls_error_pair_t psa_to_pk_rsa_errors[] = |
| { |
| { PSA_SUCCESS, 0 }, |
| { PSA_ERROR_NOT_PERMITTED, MBEDTLS_ERR_RSA_BAD_INPUT_DATA }, |
| { PSA_ERROR_INVALID_ARGUMENT, MBEDTLS_ERR_RSA_BAD_INPUT_DATA }, |
| { PSA_ERROR_INVALID_HANDLE, MBEDTLS_ERR_RSA_BAD_INPUT_DATA }, |
| { PSA_ERROR_BUFFER_TOO_SMALL, MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE }, |
| { PSA_ERROR_INSUFFICIENT_ENTROPY, MBEDTLS_ERR_RSA_RNG_FAILED }, |
| { PSA_ERROR_INVALID_SIGNATURE, MBEDTLS_ERR_RSA_VERIFY_FAILED }, |
| { PSA_ERROR_INVALID_PADDING, MBEDTLS_ERR_RSA_INVALID_PADDING } |
| }; |
| #endif |
| |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) && \ |
| defined(PSA_WANT_KEY_TYPE_ECC_PUBLIC_KEY) |
| const mbedtls_error_pair_t psa_to_pk_ecdsa_errors[] = |
| { |
| { PSA_SUCCESS, 0 }, |
| { PSA_ERROR_NOT_PERMITTED, MBEDTLS_ERR_ECP_BAD_INPUT_DATA }, |
| { PSA_ERROR_INVALID_ARGUMENT, MBEDTLS_ERR_ECP_BAD_INPUT_DATA }, |
| { PSA_ERROR_INVALID_HANDLE, MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE }, |
| { PSA_ERROR_BUFFER_TOO_SMALL, MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL }, |
| { PSA_ERROR_INSUFFICIENT_ENTROPY, MBEDTLS_ERR_ECP_RANDOM_FAILED }, |
| { PSA_ERROR_INVALID_SIGNATURE, MBEDTLS_ERR_ECP_VERIFY_FAILED } |
| }; |
| #endif |
| |
| int psa_generic_status_to_mbedtls(psa_status_t status) |
| { |
| switch (status) { |
| case PSA_SUCCESS: |
| return 0; |
| case PSA_ERROR_NOT_SUPPORTED: |
| return MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED; |
| case PSA_ERROR_CORRUPTION_DETECTED: |
| return MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| case PSA_ERROR_COMMUNICATION_FAILURE: |
| case PSA_ERROR_HARDWARE_FAILURE: |
| return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED; |
| case PSA_ERROR_NOT_PERMITTED: |
| default: |
| return MBEDTLS_ERR_ERROR_GENERIC_ERROR; |
| } |
| } |
| |
| int psa_status_to_mbedtls(psa_status_t status, |
| const mbedtls_error_pair_t *local_translations, |
| size_t local_errors_num, |
| int (*fallback_f)(psa_status_t)) |
| { |
| for (size_t i = 0; i < local_errors_num; i++) { |
| if (status == local_translations[i].psa_status) { |
| return local_translations[i].mbedtls_error; |
| } |
| } |
| return fallback_f(status); |
| } |
| |
| #if defined(MBEDTLS_PK_C) |
| int psa_pk_status_to_mbedtls(psa_status_t status) |
| { |
| switch (status) { |
| case PSA_ERROR_INVALID_HANDLE: |
| return MBEDTLS_ERR_PK_KEY_INVALID_FORMAT; |
| case PSA_ERROR_BUFFER_TOO_SMALL: |
| return MBEDTLS_ERR_PK_BUFFER_TOO_SMALL; |
| case PSA_ERROR_NOT_SUPPORTED: |
| return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE; |
| case PSA_ERROR_INVALID_ARGUMENT: |
| return MBEDTLS_ERR_PK_INVALID_ALG; |
| case PSA_ERROR_NOT_PERMITTED: |
| return MBEDTLS_ERR_PK_TYPE_MISMATCH; |
| case PSA_ERROR_INSUFFICIENT_MEMORY: |
| return MBEDTLS_ERR_PK_ALLOC_FAILED; |
| case PSA_ERROR_BAD_STATE: |
| return MBEDTLS_ERR_PK_BAD_INPUT_DATA; |
| case PSA_ERROR_DATA_CORRUPT: |
| case PSA_ERROR_DATA_INVALID: |
| case PSA_ERROR_STORAGE_FAILURE: |
| return MBEDTLS_ERR_PK_FILE_IO_ERROR; |
| default: |
| return psa_generic_status_to_mbedtls(status); |
| } |
| } |
| #endif /* MBEDTLS_PK_C */ |
| |
| /****************************************************************/ |
| /* Key management */ |
| /****************************************************************/ |
| |
| #if defined(PSA_WANT_KEY_TYPE_ECC_PUBLIC_KEY) |
| psa_ecc_family_t mbedtls_ecc_group_to_psa(mbedtls_ecp_group_id grpid, |
| size_t *bits) |
| { |
| switch (grpid) { |
| #if defined(MBEDTLS_ECP_HAVE_SECP192R1) |
| case MBEDTLS_ECP_DP_SECP192R1: |
| *bits = 192; |
| return PSA_ECC_FAMILY_SECP_R1; |
| #endif |
| #if defined(MBEDTLS_ECP_HAVE_SECP224R1) |
| case MBEDTLS_ECP_DP_SECP224R1: |
| *bits = 224; |
| return PSA_ECC_FAMILY_SECP_R1; |
| #endif |
| #if defined(MBEDTLS_ECP_HAVE_SECP256R1) |
| case MBEDTLS_ECP_DP_SECP256R1: |
| *bits = 256; |
| return PSA_ECC_FAMILY_SECP_R1; |
| #endif |
| #if defined(MBEDTLS_ECP_HAVE_SECP384R1) |
| case MBEDTLS_ECP_DP_SECP384R1: |
| *bits = 384; |
| return PSA_ECC_FAMILY_SECP_R1; |
| #endif |
| #if defined(MBEDTLS_ECP_HAVE_SECP521R1) |
| case MBEDTLS_ECP_DP_SECP521R1: |
| *bits = 521; |
| return PSA_ECC_FAMILY_SECP_R1; |
| #endif |
| #if defined(MBEDTLS_ECP_HAVE_BP256R1) |
| case MBEDTLS_ECP_DP_BP256R1: |
| *bits = 256; |
| return PSA_ECC_FAMILY_BRAINPOOL_P_R1; |
| #endif |
| #if defined(MBEDTLS_ECP_HAVE_BP384R1) |
| case MBEDTLS_ECP_DP_BP384R1: |
| *bits = 384; |
| return PSA_ECC_FAMILY_BRAINPOOL_P_R1; |
| #endif |
| #if defined(MBEDTLS_ECP_HAVE_BP512R1) |
| case MBEDTLS_ECP_DP_BP512R1: |
| *bits = 512; |
| return PSA_ECC_FAMILY_BRAINPOOL_P_R1; |
| #endif |
| #if defined(MBEDTLS_ECP_HAVE_CURVE25519) |
| case MBEDTLS_ECP_DP_CURVE25519: |
| *bits = 255; |
| return PSA_ECC_FAMILY_MONTGOMERY; |
| #endif |
| #if defined(MBEDTLS_ECP_HAVE_SECP192K1) |
| case MBEDTLS_ECP_DP_SECP192K1: |
| *bits = 192; |
| return PSA_ECC_FAMILY_SECP_K1; |
| #endif |
| #if defined(MBEDTLS_ECP_HAVE_SECP224K1) |
| /* secp224k1 is not and will not be supported in PSA (#3541). */ |
| #endif |
| #if defined(MBEDTLS_ECP_HAVE_SECP256K1) |
| case MBEDTLS_ECP_DP_SECP256K1: |
| *bits = 256; |
| return PSA_ECC_FAMILY_SECP_K1; |
| #endif |
| #if defined(MBEDTLS_ECP_HAVE_CURVE448) |
| case MBEDTLS_ECP_DP_CURVE448: |
| *bits = 448; |
| return PSA_ECC_FAMILY_MONTGOMERY; |
| #endif |
| default: |
| *bits = 0; |
| return 0; |
| } |
| } |
| |
| mbedtls_ecp_group_id mbedtls_ecc_group_from_psa(psa_ecc_family_t family, |
| size_t bits) |
| { |
| switch (family) { |
| case PSA_ECC_FAMILY_SECP_R1: |
| switch (bits) { |
| #if defined(PSA_WANT_ECC_SECP_R1_192) |
| case 192: |
| return MBEDTLS_ECP_DP_SECP192R1; |
| #endif |
| #if defined(PSA_WANT_ECC_SECP_R1_224) |
| case 224: |
| return MBEDTLS_ECP_DP_SECP224R1; |
| #endif |
| #if defined(PSA_WANT_ECC_SECP_R1_256) |
| case 256: |
| return MBEDTLS_ECP_DP_SECP256R1; |
| #endif |
| #if defined(PSA_WANT_ECC_SECP_R1_384) |
| case 384: |
| return MBEDTLS_ECP_DP_SECP384R1; |
| #endif |
| #if defined(PSA_WANT_ECC_SECP_R1_521) |
| case 521: |
| return MBEDTLS_ECP_DP_SECP521R1; |
| #endif |
| } |
| break; |
| |
| case PSA_ECC_FAMILY_BRAINPOOL_P_R1: |
| switch (bits) { |
| #if defined(PSA_WANT_ECC_BRAINPOOL_P_R1_256) |
| case 256: |
| return MBEDTLS_ECP_DP_BP256R1; |
| #endif |
| #if defined(PSA_WANT_ECC_BRAINPOOL_P_R1_384) |
| case 384: |
| return MBEDTLS_ECP_DP_BP384R1; |
| #endif |
| #if defined(PSA_WANT_ECC_BRAINPOOL_P_R1_512) |
| case 512: |
| return MBEDTLS_ECP_DP_BP512R1; |
| #endif |
| } |
| break; |
| |
| case PSA_ECC_FAMILY_MONTGOMERY: |
| switch (bits) { |
| #if defined(PSA_WANT_ECC_MONTGOMERY_255) |
| case 255: |
| return MBEDTLS_ECP_DP_CURVE25519; |
| #endif |
| #if defined(PSA_WANT_ECC_MONTGOMERY_448) |
| case 448: |
| return MBEDTLS_ECP_DP_CURVE448; |
| #endif |
| } |
| break; |
| |
| case PSA_ECC_FAMILY_SECP_K1: |
| switch (bits) { |
| #if defined(PSA_WANT_ECC_SECP_K1_192) |
| case 192: |
| return MBEDTLS_ECP_DP_SECP192K1; |
| #endif |
| #if defined(PSA_WANT_ECC_SECP_K1_224) |
| /* secp224k1 is not and will not be supported in PSA (#3541). */ |
| #endif |
| #if defined(PSA_WANT_ECC_SECP_K1_256) |
| case 256: |
| return MBEDTLS_ECP_DP_SECP256K1; |
| #endif |
| } |
| break; |
| } |
| |
| return MBEDTLS_ECP_DP_NONE; |
| } |
| #endif /* PSA_WANT_KEY_TYPE_ECC_PUBLIC_KEY */ |
| |
| /* Wrapper function allowing the classic API to use the PSA RNG. |
| * |
| * `mbedtls_psa_get_random(MBEDTLS_PSA_RANDOM_STATE, ...)` calls |
| * `psa_generate_random(...)`. The state parameter is ignored since the |
| * PSA API doesn't support passing an explicit state. |
| */ |
| int mbedtls_psa_get_random(void *p_rng, |
| unsigned char *output, |
| size_t output_size) |
| { |
| /* This function takes a pointer to the RNG state because that's what |
| * classic mbedtls functions using an RNG expect. The PSA RNG manages |
| * its own state internally and doesn't let the caller access that state. |
| * So we just ignore the state parameter, and in practice we'll pass |
| * NULL. */ |
| (void) p_rng; |
| psa_status_t status = psa_generate_random(output, output_size); |
| if (status == PSA_SUCCESS) { |
| return 0; |
| } else { |
| return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED; |
| } |
| } |
| |
| #endif /* MBEDTLS_PSA_CRYPTO_CLIENT */ |
| |
| #if defined(MBEDTLS_PSA_UTIL_HAVE_ECDSA) |
| |
| /** |
| * \brief Convert a single raw coordinate to DER ASN.1 format. The output der |
| * buffer is filled backward (i.e. starting from its end). |
| * |
| * \param raw_buf Buffer containing the raw coordinate to be |
| * converted. |
| * \param raw_len Length of raw_buf in bytes. This must be > 0. |
| * \param der_buf_start Pointer to the beginning of the buffer which |
| * will be filled with the DER converted data. |
| * \param der_buf_end End of the buffer used to store the DER output. |
| * |
| * \return On success, the amount of data (in bytes) written to |
| * the DER buffer. |
| * \return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL if the provided der |
| * buffer is too small to contain all the converted data. |
| * \return MBEDTLS_ERR_ASN1_INVALID_DATA if the input raw |
| * coordinate is null (i.e. all zeros). |
| * |
| * \warning Raw and der buffer must not be overlapping. |
| */ |
| static int convert_raw_to_der_single_int(const unsigned char *raw_buf, size_t raw_len, |
| unsigned char *der_buf_start, |
| unsigned char *der_buf_end) |
| { |
| unsigned char *p = der_buf_end; |
| int len; |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| |
| /* ASN.1 DER encoding requires minimal length, so skip leading 0s. |
| * Provided input MPIs should not be 0, but as a failsafe measure, still |
| * detect that and return error in case. */ |
| while (*raw_buf == 0x00) { |
| ++raw_buf; |
| --raw_len; |
| if (raw_len == 0) { |
| return MBEDTLS_ERR_ASN1_INVALID_DATA; |
| } |
| } |
| len = (int) raw_len; |
| |
| /* Copy the raw coordinate to the end of der_buf. */ |
| if ((p - der_buf_start) < len) { |
| return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL; |
| } |
| p -= len; |
| memcpy(p, raw_buf, len); |
| |
| /* If MSb is 1, ASN.1 requires that we prepend a 0. */ |
| if (*p & 0x80) { |
| if ((p - der_buf_start) < 1) { |
| return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL; |
| } |
| --p; |
| *p = 0x00; |
| ++len; |
| } |
| |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&p, der_buf_start, len)); |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(&p, der_buf_start, MBEDTLS_ASN1_INTEGER)); |
| |
| return len; |
| } |
| |
| int mbedtls_ecdsa_raw_to_der(size_t bits, const unsigned char *raw, size_t raw_len, |
| unsigned char *der, size_t der_size, size_t *der_len) |
| { |
| unsigned char r[PSA_BITS_TO_BYTES(PSA_VENDOR_ECC_MAX_CURVE_BITS)]; |
| unsigned char s[PSA_BITS_TO_BYTES(PSA_VENDOR_ECC_MAX_CURVE_BITS)]; |
| const size_t coordinate_len = PSA_BITS_TO_BYTES(bits); |
| size_t len = 0; |
| unsigned char *p = der + der_size; |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| |
| if (raw_len != (2 * coordinate_len)) { |
| return MBEDTLS_ERR_ASN1_INVALID_DATA; |
| } |
| |
| /* Since raw and der buffers might overlap, dump r and s before starting |
| * the conversion. */ |
| memcpy(r, raw, coordinate_len); |
| memcpy(s, raw + coordinate_len, coordinate_len); |
| |
| /* der buffer will initially be written starting from its end so we pick s |
| * first and then r. */ |
| ret = convert_raw_to_der_single_int(s, coordinate_len, der, p); |
| if (ret < 0) { |
| return ret; |
| } |
| p -= ret; |
| len += ret; |
| |
| ret = convert_raw_to_der_single_int(r, coordinate_len, der, p); |
| if (ret < 0) { |
| return ret; |
| } |
| p -= ret; |
| len += ret; |
| |
| /* Add ASN.1 header (len + tag). */ |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&p, der, len)); |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(&p, der, |
| MBEDTLS_ASN1_CONSTRUCTED | |
| MBEDTLS_ASN1_SEQUENCE)); |
| |
| /* memmove the content of der buffer to its beginnig. */ |
| memmove(der, p, len); |
| *der_len = len; |
| |
| return 0; |
| } |
| |
| /** |
| * \brief Convert a single integer from ASN.1 DER format to raw. |
| * |
| * \param der Buffer containing the DER integer value to be |
| * converted. |
| * \param der_len Length of the der buffer in bytes. |
| * \param raw Output buffer that will be filled with the |
| * converted data. This should be at least |
| * coordinate_size bytes and it must be zeroed before |
| * calling this function. |
| * \param coordinate_size Size (in bytes) of a single coordinate in raw |
| * format. |
| * |
| * \return On success, the amount of DER data parsed from the |
| * provided der buffer. |
| * \return MBEDTLS_ERR_ASN1_UNEXPECTED_TAG if the integer tag |
| * is missing in the der buffer. |
| * \return MBEDTLS_ERR_ASN1_LENGTH_MISMATCH if the integer |
| * is null (i.e. all zeros) or if the output raw buffer |
| * is too small to contain the converted raw value. |
| * |
| * \warning Der and raw buffers must not be overlapping. |
| */ |
| static int convert_der_to_raw_single_int(unsigned char *der, size_t der_len, |
| unsigned char *raw, size_t coordinate_size) |
| { |
| unsigned char *p = der; |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| size_t unpadded_len, padding_len = 0; |
| |
| /* Get the length of ASN.1 element (i.e. the integer we need to parse). */ |
| ret = mbedtls_asn1_get_tag(&p, p + der_len, &unpadded_len, |
| MBEDTLS_ASN1_INTEGER); |
| if (ret != 0) { |
| return ret; |
| } |
| |
| /* It's invalid to have: |
| * - unpadded_len == 0. |
| * - MSb set without a leading 0x00 (leading 0x00 is checked below). */ |
| if (((unpadded_len == 0) || (*p & 0x80) != 0)) { |
| return MBEDTLS_ERR_ASN1_INVALID_DATA; |
| } |
| |
| /* Skip possible leading zero */ |
| if (*p == 0x00) { |
| p++; |
| unpadded_len--; |
| /* It is not allowed to have more than 1 leading zero. |
| * Ignore the case in which unpadded_len = 0 because that's a 0 encoded |
| * in ASN.1 format (i.e. 020100). */ |
| if ((unpadded_len > 0) && (*p == 0x00)) { |
| return MBEDTLS_ERR_ASN1_INVALID_DATA; |
| } |
| } |
| |
| if (unpadded_len > coordinate_size) { |
| /* Parsed number is longer than the maximum expected value. */ |
| return MBEDTLS_ERR_ASN1_INVALID_DATA; |
| } |
| padding_len = coordinate_size - unpadded_len; |
| /* raw buffer was already zeroed by the calling function so zero-padding |
| * operation is skipped here. */ |
| memcpy(raw + padding_len, p, unpadded_len); |
| p += unpadded_len; |
| |
| return (int) (p - der); |
| } |
| |
| int mbedtls_ecdsa_der_to_raw(size_t bits, const unsigned char *der, size_t der_len, |
| unsigned char *raw, size_t raw_size, size_t *raw_len) |
| { |
| unsigned char raw_tmp[PSA_VENDOR_ECDSA_SIGNATURE_MAX_SIZE]; |
| unsigned char *p = (unsigned char *) der; |
| size_t data_len; |
| size_t coordinate_size = PSA_BITS_TO_BYTES(bits); |
| int ret; |
| |
| /* The output raw buffer should be at least twice the size of a raw |
| * coordinate in order to store r and s. */ |
| if (raw_size < coordinate_size * 2) { |
| return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL; |
| } |
| |
| /* Check that the provided input DER buffer has the right header. */ |
| ret = mbedtls_asn1_get_tag(&p, der + der_len, &data_len, |
| MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE); |
| if (ret != 0) { |
| return ret; |
| } |
| |
| memset(raw_tmp, 0, 2 * coordinate_size); |
| |
| /* Extract r */ |
| ret = convert_der_to_raw_single_int(p, data_len, raw_tmp, coordinate_size); |
| if (ret < 0) { |
| return ret; |
| } |
| p += ret; |
| data_len -= ret; |
| |
| /* Extract s */ |
| ret = convert_der_to_raw_single_int(p, data_len, raw_tmp + coordinate_size, |
| coordinate_size); |
| if (ret < 0) { |
| return ret; |
| } |
| p += ret; |
| data_len -= ret; |
| |
| /* Check that we consumed all the input der data. */ |
| if ((size_t) (p - der) != der_len) { |
| return MBEDTLS_ERR_ASN1_LENGTH_MISMATCH; |
| } |
| |
| memcpy(raw, raw_tmp, 2 * coordinate_size); |
| *raw_len = 2 * coordinate_size; |
| |
| return 0; |
| } |
| |
| #endif /* MBEDTLS_PSA_UTIL_HAVE_ECDSA */ |
