/** \file psa_crypto_random_impl.h * * \brief PSA crypto random generator implementation abstraction. */ /* * Copyright The Mbed TLS Contributors * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */ #ifndef PSA_CRYPTO_RANDOM_IMPL_H #define PSA_CRYPTO_RANDOM_IMPL_H #include "psa_util_internal.h" #if defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG) typedef mbedtls_psa_external_random_context_t mbedtls_psa_random_context_t; #else /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */ #include "mbedtls/entropy.h" /* Choose a DRBG based on configuration and availability */ #if defined(MBEDTLS_CTR_DRBG_C) #include "mbedtls/ctr_drbg.h" #undef MBEDTLS_PSA_HMAC_DRBG_MD_TYPE #elif defined(MBEDTLS_HMAC_DRBG_C) #include "mbedtls/hmac_drbg.h" #if defined(MBEDTLS_MD_CAN_SHA512) && defined(MBEDTLS_MD_CAN_SHA256) #include <limits.h> #if SIZE_MAX > 0xffffffff /* Looks like a 64-bit system, so prefer SHA-512. */ #define MBEDTLS_PSA_HMAC_DRBG_MD_TYPE … #else /* Looks like a 32-bit system, so prefer SHA-256. */ #define MBEDTLS_PSA_HMAC_DRBG_MD_TYPE … #endif #elif defined(MBEDTLS_MD_CAN_SHA512) #define MBEDTLS_PSA_HMAC_DRBG_MD_TYPE … #elif defined(MBEDTLS_MD_CAN_SHA256) #define MBEDTLS_PSA_HMAC_DRBG_MD_TYPE … #else #error "No hash algorithm available for HMAC_DBRG." #endif #else /* !MBEDTLS_CTR_DRBG_C && !MBEDTLS_HMAC_DRBG_C*/ #error "No DRBG module available for the psa_crypto module." #endif /* !MBEDTLS_CTR_DRBG_C && !MBEDTLS_HMAC_DRBG_C*/ /* The maximum number of bytes that mbedtls_psa_get_random() is expected to return. */ #if defined(MBEDTLS_CTR_DRBG_C) #define MBEDTLS_PSA_RANDOM_MAX_REQUEST … #elif defined(MBEDTLS_HMAC_DRBG_C) #define MBEDTLS_PSA_RANDOM_MAX_REQUEST … #endif #if defined(MBEDTLS_CTR_DRBG_C) mbedtls_psa_drbg_context_t; #elif defined(MBEDTLS_HMAC_DRBG_C) typedef mbedtls_hmac_drbg_context mbedtls_psa_drbg_context_t; #endif /* !MBEDTLS_CTR_DRBG_C && !MBEDTLS_HMAC_DRBG_C */ mbedtls_psa_random_context_t; /** Initialize the PSA DRBG. * * \param p_rng Pointer to the Mbed TLS DRBG state. */ static inline void mbedtls_psa_drbg_init(mbedtls_psa_drbg_context_t *p_rng) { … } /** Deinitialize the PSA DRBG. * * \param p_rng Pointer to the Mbed TLS DRBG state. */ static inline void mbedtls_psa_drbg_free(mbedtls_psa_drbg_context_t *p_rng) { … } /** Seed the PSA DRBG. * * \param entropy An entropy context to read the seed from. * \param custom The personalization string. * This can be \c NULL, in which case the personalization * string is empty regardless of the value of \p len. * \param len The length of the personalization string. * * \return \c 0 on success. * \return An Mbed TLS error code (\c MBEDTLS_ERR_xxx) on failure. */ static inline int mbedtls_psa_drbg_seed(mbedtls_psa_drbg_context_t *drbg_ctx, mbedtls_entropy_context *entropy, const unsigned char *custom, size_t len) { … } #endif /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */ #endif /* PSA_CRYPTO_RANDOM_IMPL_H */
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