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/*
* Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "crypto/rand.h"
#include "crypto/rand_pool.h"
#include <openssl/core_dispatch.h>
#include <openssl/err.h>
size_t ossl_rand_get_entropy(ossl_unused OSSL_CORE_HANDLE *handle,
unsigned char **pout, int entropy,
size_t min_len, size_t max_len)
{
size_t ret = 0;
size_t entropy_available;
RAND_POOL *pool;
pool = ossl_rand_pool_new(entropy, 1, min_len, max_len);
if (pool == NULL) {
ERR_raise(ERR_LIB_RAND, ERR_R_MALLOC_FAILURE);
return 0;
}
/* Get entropy by polling system entropy sources. */
entropy_available = ossl_pool_acquire_entropy(pool);
if (entropy_available > 0) {
ret = ossl_rand_pool_length(pool);
*pout = ossl_rand_pool_detach(pool);
}
ossl_rand_pool_free(pool);
return ret;
}
void ossl_rand_cleanup_entropy(ossl_unused OSSL_CORE_HANDLE *handle,
unsigned char *buf, size_t len)
{
OPENSSL_secure_clear_free(buf, len);
}
size_t ossl_rand_get_nonce(ossl_unused OSSL_CORE_HANDLE *handle,
unsigned char **pout, size_t min_len, size_t max_len,
const void *salt, size_t salt_len)
{
size_t ret = 0;
RAND_POOL *pool;
pool = ossl_rand_pool_new(0, 0, min_len, max_len);
if (pool == NULL) {
ERR_raise(ERR_LIB_RAND, ERR_R_MALLOC_FAILURE);
return 0;
}
if (!ossl_pool_add_nonce_data(pool))
goto err;
if (salt != NULL && !ossl_rand_pool_add(pool, salt, salt_len, 0))
goto err;
ret = ossl_rand_pool_length(pool);
*pout = ossl_rand_pool_detach(pool);
err:
ossl_rand_pool_free(pool);
return ret;
}
void ossl_rand_cleanup_nonce(ossl_unused OSSL_CORE_HANDLE *handle,
unsigned char *buf, size_t len)
{
OPENSSL_clear_free(buf, len);
}
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