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/*
* Copyright 2011-2021 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 <openssl/evp.h>
#include <openssl/rand.h>
#include "rand_local.h"
/* Implements the default OpenSSL RAND_add() method */
static int drbg_add(const void *buf, int num, double randomness)
{
EVP_RAND_CTX *drbg = RAND_get0_primary(NULL);
if (drbg == NULL || num <= 0)
return 0;
return EVP_RAND_reseed(drbg, 0, NULL, 0, buf, num);
}
/* Implements the default OpenSSL RAND_seed() method */
static int drbg_seed(const void *buf, int num)
{
return drbg_add(buf, num, num);
}
/* Implements the default OpenSSL RAND_status() method */
static int drbg_status(void)
{
EVP_RAND_CTX *drbg = RAND_get0_primary(NULL);
if (drbg == NULL)
return 0;
return EVP_RAND_get_state(drbg) == EVP_RAND_STATE_READY ? 1 : 0;
}
/* Implements the default OpenSSL RAND_bytes() method */
static int drbg_bytes(unsigned char *out, int count)
{
EVP_RAND_CTX *drbg = RAND_get0_public(NULL);
if (drbg == NULL)
return 0;
return EVP_RAND_generate(drbg, out, count, 0, 0, NULL, 0);
}
RAND_METHOD ossl_rand_meth = {
drbg_seed,
drbg_bytes,
NULL,
drbg_add,
drbg_bytes,
drbg_status
};
RAND_METHOD *RAND_OpenSSL(void)
{
return &ossl_rand_meth;
}
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