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/**
* \file psa_util.h
*
* \brief Utility functions for the use of the PSA Crypto library.
*/
/*
* 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 "mbedtls/build_info.h"
#if defined(MBEDTLS_PSA_CRYPTO_C)
/* Expose whatever RNG the PSA subsystem uses to applications using the
* mbedtls_xxx API. The declarations and definitions here need to be
* consistent with the implementation in library/psa_crypto_random_impl.h.
* See that file for implementation documentation. */
/* The type of a `f_rng` random generator function that many library functions
* take.
*
* This type name is not part of the Mbed TLS stable API. It may be renamed
* or moved without warning.
*/
typedef int mbedtls_f_rng_t(void *p_rng, unsigned char *output, size_t output_size);
#if defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
/** The random generator function for the PSA subsystem.
*
* This function is suitable as the `f_rng` random generator function
* parameter of many `mbedtls_xxx` functions. Use #MBEDTLS_PSA_RANDOM_STATE
* to obtain the \p p_rng parameter.
*
* The implementation of this function depends on the configuration of the
* library.
*
* \note Depending on the configuration, this may be a function or
* a pointer to a function.
*
* \note This function may only be used if the PSA crypto subsystem is active.
* This means that you must call psa_crypto_init() before any call to
* this function, and you must not call this function after calling
* mbedtls_psa_crypto_free().
*
* \param p_rng The random generator context. This must be
* #MBEDTLS_PSA_RANDOM_STATE. No other state is
* supported.
* \param output The buffer to fill. It must have room for
* \c output_size bytes.
* \param output_size The number of bytes to write to \p output.
* This function may fail if \p output_size is too
* large. It is guaranteed to accept any output size
* requested by Mbed TLS library functions. The
* maximum request size depends on the library
* configuration.
*
* \return \c 0 on success.
* \return An `MBEDTLS_ERR_ENTROPY_xxx`,
* `MBEDTLS_ERR_PLATFORM_xxx,
* `MBEDTLS_ERR_CTR_DRBG_xxx` or
* `MBEDTLS_ERR_HMAC_DRBG_xxx` on error.
*/
int mbedtls_psa_get_random(void *p_rng,
unsigned char *output,
size_t output_size);
/** The random generator state for the PSA subsystem.
*
* This macro expands to an expression which is suitable as the `p_rng`
* random generator state parameter of many `mbedtls_xxx` functions.
* It must be used in combination with the random generator function
* mbedtls_psa_get_random().
*
* The implementation of this macro depends on the configuration of the
* library. Do not make any assumption on its nature.
*/
#define MBEDTLS_PSA_RANDOM_STATE NULL
#else /* !defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG) */
#if defined(MBEDTLS_CTR_DRBG_C)
#include "mbedtls/ctr_drbg.h"
typedef mbedtls_ctr_drbg_context mbedtls_psa_drbg_context_t;
static mbedtls_f_rng_t *const mbedtls_psa_get_random = mbedtls_ctr_drbg_random;
#elif defined(MBEDTLS_HMAC_DRBG_C)
#include "mbedtls/hmac_drbg.h"
typedef mbedtls_hmac_drbg_context mbedtls_psa_drbg_context_t;
static mbedtls_f_rng_t *const mbedtls_psa_get_random = mbedtls_hmac_drbg_random;
#endif
extern mbedtls_psa_drbg_context_t *const mbedtls_psa_random_state;
#define MBEDTLS_PSA_RANDOM_STATE mbedtls_psa_random_state
#endif /* !defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG) */
#endif /* MBEDTLS_PSA_CRYPTO_C */
#endif /* MBEDTLS_PSA_UTIL_H */
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