mirror of https://github.com/openssl/openssl.git
70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
/*
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* Copyright 2011-2021 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <openssl/evp.h>
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#include <openssl/rand.h>
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#include "rand_local.h"
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/* Implements the default OpenSSL RAND_add() method */
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static int drbg_add(const void *buf, int num, double randomness)
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{
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EVP_RAND_CTX *drbg = RAND_get0_primary(NULL);
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if (drbg == NULL || num <= 0)
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return 0;
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return EVP_RAND_reseed(drbg, 0, NULL, 0, buf, num);
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}
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/* Implements the default OpenSSL RAND_seed() method */
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static int drbg_seed(const void *buf, int num)
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{
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return drbg_add(buf, num, num);
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}
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/* Implements the default OpenSSL RAND_status() method */
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static int drbg_status(void)
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{
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EVP_RAND_CTX *drbg = RAND_get0_primary(NULL);
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if (drbg == NULL)
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return 0;
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return EVP_RAND_state(drbg) == EVP_RAND_STATE_READY ? 1 : 0;
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}
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/* Implements the default OpenSSL RAND_bytes() method */
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static int drbg_bytes(unsigned char *out, int count)
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{
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EVP_RAND_CTX *drbg = RAND_get0_public(NULL);
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if (drbg == NULL)
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return 0;
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return EVP_RAND_generate(drbg, out, count, 0, 0, NULL, 0);
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}
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RAND_METHOD ossl_rand_meth = {
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drbg_seed,
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drbg_bytes,
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NULL,
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drbg_add,
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drbg_bytes,
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drbg_status
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};
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RAND_METHOD *RAND_OpenSSL(void)
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{
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#ifndef FIPS_MODULE
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return &ossl_rand_meth;
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#else
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return NULL;
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#endif
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}
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