- /* Copyright (c) 2015, Google Inc.
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
- * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
-
- #ifndef OPENSSL_HEADER_CRYPTO_RAND_INTERNAL_H
- #define OPENSSL_HEADER_CRYPTO_RAND_INTERNAL_H
-
- #include <openssl/aes.h>
-
- #include "../../internal.h"
- #include "../modes/internal.h"
-
- #if defined(__cplusplus)
- extern "C" {
- #endif
-
-
- // RAND_bytes_with_additional_data samples from the RNG after mixing 32 bytes
- // from |user_additional_data| in.
- void RAND_bytes_with_additional_data(uint8_t *out, size_t out_len,
- const uint8_t user_additional_data[32]);
-
- // CRYPTO_sysrand fills |len| bytes at |buf| with entropy from the operating
- // system.
- void CRYPTO_sysrand(uint8_t *buf, size_t len);
-
- // rand_fork_unsafe_buffering_enabled returns whether fork-unsafe buffering has
- // been enabled via |RAND_enable_fork_unsafe_buffering|.
- int rand_fork_unsafe_buffering_enabled(void);
-
- // CTR_DRBG_STATE contains the state of a CTR_DRBG based on AES-256. See SP
- // 800-90Ar1.
- typedef struct {
- alignas(16) AES_KEY ks;
- block128_f block;
- ctr128_f ctr;
- union {
- uint8_t bytes[16];
- uint32_t words[4];
- } counter;
- uint64_t reseed_counter;
- } CTR_DRBG_STATE;
-
- // See SP 800-90Ar1, table 3.
- #define CTR_DRBG_ENTROPY_LEN 48
- #define CTR_DRBG_MAX_GENERATE_LENGTH 65536
-
- // CTR_DRBG_init initialises |*drbg| given |CTR_DRBG_ENTROPY_LEN| bytes of
- // entropy in |entropy| and, optionally, a personalization string up to
- // |CTR_DRBG_ENTROPY_LEN| bytes in length. It returns one on success and zero
- // on error.
- OPENSSL_EXPORT int CTR_DRBG_init(CTR_DRBG_STATE *drbg,
- const uint8_t entropy[CTR_DRBG_ENTROPY_LEN],
- const uint8_t *personalization,
- size_t personalization_len);
-
- // CTR_DRBG_reseed reseeds |drbg| given |CTR_DRBG_ENTROPY_LEN| bytes of entropy
- // in |entropy| and, optionally, up to |CTR_DRBG_ENTROPY_LEN| bytes of
- // additional data. It returns one on success or zero on error.
- OPENSSL_EXPORT int CTR_DRBG_reseed(CTR_DRBG_STATE *drbg,
- const uint8_t entropy[CTR_DRBG_ENTROPY_LEN],
- const uint8_t *additional_data,
- size_t additional_data_len);
-
- // CTR_DRBG_generate processes to up |CTR_DRBG_ENTROPY_LEN| bytes of additional
- // data (if any) and then writes |out_len| random bytes to |out|, where
- // |out_len| <= |CTR_DRBG_MAX_GENERATE_LENGTH|. It returns one on success or
- // zero on error.
- OPENSSL_EXPORT int CTR_DRBG_generate(CTR_DRBG_STATE *drbg, uint8_t *out,
- size_t out_len,
- const uint8_t *additional_data,
- size_t additional_data_len);
-
- // CTR_DRBG_clear zeroises the state of |drbg|.
- OPENSSL_EXPORT void CTR_DRBG_clear(CTR_DRBG_STATE *drbg);
-
-
- #if defined(__cplusplus)
- } // extern C
- #endif
-
- #endif // OPENSSL_HEADER_CRYPTO_RAND_INTERNAL_H
|