/* * 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 #include #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) { #ifndef FIPS_MODULE return &ossl_rand_meth; #else return NULL; #endif }