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openssl
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rand_drbg.h
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/* * Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the OpenSSL license (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 */ #ifndef HEADER_DRBG_RAND_H # define HEADER_DRBG_RAND_H # include <time.h> # include <openssl/ossl_typ.h> # include <openssl/obj_mac.h> /* * RAND_DRBG flags * * Note: if new flags are added, the constant `rand_drbg_used_flags` * in drbg_lib.c needs to be updated accordingly. */ /* In CTR mode, disable derivation function ctr_df */ # define RAND_DRBG_FLAG_CTR_NO_DF 0x1 # if OPENSSL_API_COMPAT < 0x10200000L /* This #define was replaced by an internal constant and should not be used. */ # define RAND_DRBG_USED_FLAGS (RAND_DRBG_FLAG_CTR_NO_DF) # endif /* * Default security strength (in the sense of [NIST SP 800-90Ar1]) * * NIST SP 800-90Ar1 supports the strength of the DRBG being smaller than that * of the cipher by collecting less entropy. The current DRBG implementation * does not take RAND_DRBG_STRENGTH into account and sets the strength of the * DRBG to that of the cipher. * * RAND_DRBG_STRENGTH is currently only used for the legacy RAND * implementation. * * Currently supported ciphers are: NID_aes_128_ctr, NID_aes_192_ctr and * NID_aes_256_ctr */ # define RAND_DRBG_STRENGTH 256 /* Default drbg type */ # define RAND_DRBG_TYPE NID_aes_256_ctr /* Default drbg flags */ # define RAND_DRBG_FLAGS 0 # ifdef __cplusplus extern "C" { # endif /* * Object lifetime functions. */ RAND_DRBG *RAND_DRBG_new(int type, unsigned int flags, RAND_DRBG *parent); RAND_DRBG *RAND_DRBG_secure_new(int type, unsigned int flags, RAND_DRBG *parent); int RAND_DRBG_set(RAND_DRBG *drbg, int type, unsigned int flags); int RAND_DRBG_set_defaults(int type, unsigned int flags); int RAND_DRBG_instantiate(RAND_DRBG *drbg, const unsigned char *pers, size_t perslen); int RAND_DRBG_uninstantiate(RAND_DRBG *drbg); void RAND_DRBG_free(RAND_DRBG *drbg); /* * Object "use" functions. */ int RAND_DRBG_reseed(RAND_DRBG *drbg, const unsigned char *adin, size_t adinlen, int prediction_resistance); int RAND_DRBG_generate(RAND_DRBG *drbg, unsigned char *out, size_t outlen, int prediction_resistance, const unsigned char *adin, size_t adinlen); int RAND_DRBG_bytes(RAND_DRBG *drbg, unsigned char *out, size_t outlen); int RAND_DRBG_set_reseed_interval(RAND_DRBG *drbg, unsigned int interval); int RAND_DRBG_set_reseed_time_interval(RAND_DRBG *drbg, time_t interval); int RAND_DRBG_set_reseed_defaults( unsigned int master_reseed_interval, unsigned int slave_reseed_interval, time_t master_reseed_time_interval, time_t slave_reseed_time_interval ); RAND_DRBG *RAND_DRBG_get0_master(void); RAND_DRBG *RAND_DRBG_get0_public(void); RAND_DRBG *RAND_DRBG_get0_private(void); /* * EXDATA */ # define RAND_DRBG_get_ex_new_index(l, p, newf, dupf, freef) \ CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DRBG, l, p, newf, dupf, freef) int RAND_DRBG_set_ex_data(RAND_DRBG *drbg, int idx, void *arg); void *RAND_DRBG_get_ex_data(const RAND_DRBG *drbg, int idx); /* * Callback function typedefs */ typedef size_t (*RAND_DRBG_get_entropy_fn)(RAND_DRBG *drbg, unsigned char **pout, int entropy, size_t min_len, size_t max_len, int prediction_resistance); typedef void (*RAND_DRBG_cleanup_entropy_fn)(RAND_DRBG *ctx, unsigned char *out, size_t outlen); typedef size_t (*RAND_DRBG_get_nonce_fn)(RAND_DRBG *drbg, unsigned char **pout, int entropy, size_t min_len, size_t max_len); typedef void (*RAND_DRBG_cleanup_nonce_fn)(RAND_DRBG *drbg, unsigned char *out, size_t outlen); int RAND_DRBG_set_callbacks(RAND_DRBG *drbg, RAND_DRBG_get_entropy_fn get_entropy, RAND_DRBG_cleanup_entropy_fn cleanup_entropy, RAND_DRBG_get_nonce_fn get_nonce, RAND_DRBG_cleanup_nonce_fn cleanup_nonce); # ifdef __cplusplus } # endif #endif