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Diffstat (limited to 'include/openssl/rand_drbg.h')
| -rw-r--r-- | include/openssl/rand_drbg.h | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/include/openssl/rand_drbg.h b/include/openssl/rand_drbg.h new file mode 100644 index 0000000000..667a8ab2fd --- /dev/null +++ b/include/openssl/rand_drbg.h @@ -0,0 +1,113 @@ +/* + * 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> + + +/* In CTR mode, disable derivation function ctr_df */ +# define RAND_DRBG_FLAG_CTR_NO_DF 0x1 + +/* + * 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 implemantion 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 + * + * TODO(DRBG): would be nice to have the NID and strength configurable + */ +# define RAND_DRBG_STRENGTH 256 +# define RAND_DRBG_NID NID_aes_256_ctr + + +# 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_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 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 *dctx, int idx, void *arg); +void *RAND_DRBG_get_ex_data(const RAND_DRBG *dctx, int idx); + +/* + * Callback function typedefs + */ +typedef size_t (*RAND_DRBG_get_entropy_fn)(RAND_DRBG *ctx, + unsigned char **pout, + int entropy, size_t min_len, + size_t max_len); +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 *ctx, unsigned char **pout, + int entropy, size_t min_len, + size_t max_len); +typedef void (*RAND_DRBG_cleanup_nonce_fn)(RAND_DRBG *ctx, + unsigned char *out, size_t outlen); + +int RAND_DRBG_set_callbacks(RAND_DRBG *dctx, + 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 |