| /* |
| * 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; |
| } |