diff options
Diffstat (limited to 'thirdparty/mbedtls/library/psa_util.c')
| -rw-r--r-- | thirdparty/mbedtls/library/psa_util.c | 608 |
1 files changed, 608 insertions, 0 deletions
diff --git a/thirdparty/mbedtls/library/psa_util.c b/thirdparty/mbedtls/library/psa_util.c new file mode 100644 index 0000000000..679d00ea9b --- /dev/null +++ b/thirdparty/mbedtls/library/psa_util.c @@ -0,0 +1,608 @@ +/* + * 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; + } + if (coordinate_len > sizeof(r)) { + return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL; + } + + /* 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; + } + if (2 * coordinate_size > sizeof(raw_tmp)) { + 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 */ |