psa_util.h

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/*
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 */

#ifndef MBEDTLS_PSA_UTIL_H
#define MBEDTLS_PSA_UTIL_H
#include "mbedtls/private_access.h"

#include "tf-psa-crypto/build_info.h"

#include "psa/crypto.h"

/* ASN1 defines used in the ECDSA conversion functions.
 * Note: intentionally not adding MBEDTLS_ASN1_[PARSE|WRITE]_C guards here
 * otherwise error codes would be unknown in test_suite_psa_crypto_util.data.*/
#include <mbedtls/asn1write.h>

#if defined(MBEDTLS_PSA_CRYPTO_CLIENT)

int mbedtls_psa_get_random(void *p_rng,
                           unsigned char *output,
                           size_t output_size);

#define MBEDTLS_PSA_RANDOM_STATE    NULL

static inline psa_algorithm_t mbedtls_md_psa_alg_from_type(mbedtls_md_type_t md_type)
{
    return PSA_ALG_CATEGORY_HASH | (psa_algorithm_t) md_type;
}

static inline mbedtls_md_type_t mbedtls_md_type_from_psa_alg(psa_algorithm_t psa_alg)
{
    return (mbedtls_md_type_t) (psa_alg & PSA_ALG_HASH_MASK);
}
#endif /* MBEDTLS_PSA_CRYPTO_CLIENT */

#if defined(PSA_HAVE_ALG_SOME_ECDSA)

/*
 *     Ecdsa-Sig-Value ::= SEQUENCE {
 *         r       INTEGER,
 *         s       INTEGER
 *     }
 *
 * For each of r and s, the value (V) may include an extra initial "0" bit.
 */
#define MBEDTLS_ECDSA_DER_MAX_SIG_LEN(bits)                               \
    (/*T,L of SEQUENCE*/ ((bits) >= 61 * 8 ? 3 : 2) +              \
     /*T,L of r,s*/ 2 * (((bits) >= 127 * 8 ? 3 : 2) +     \
                         /*V of r,s*/ ((bits) + 8) / 8))

#define MBEDTLS_ECDSA_DER_MAX_LEN  MBEDTLS_ECDSA_DER_MAX_SIG_LEN(PSA_VENDOR_ECC_MAX_CURVE_BITS)

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);

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);

#endif /* PSA_HAVE_ALG_SOME_ECDSA */

#endif /* MBEDTLS_PSA_UTIL_H */