79 lines
3.0 KiB
C
79 lines
3.0 KiB
C
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/* Copyright (c) 2017, Google Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
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/***************************************************************************
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* Small modification by Nir Drucker and Shay Gueron
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* AWS Cryptographic Algorithms Group
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* (ndrucker@amazon.com, gueron@amazon.com)
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* include:
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* 1) Use memcpy/memset instead of OPENSSL_memcpy/memset
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* 2) Include aes.h as the underlying aes code
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* 3) Modifying the drbg structure
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* ***************************************************************************/
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#pragma once
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#if defined(__cplusplus)
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extern "C" {
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#endif
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#include "aes_ni.h"
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// CTR_DRBG_STATE contains the state of a CTR_DRBG based on AES-256. See SP
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// 800-90Ar1.
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typedef struct {
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aes256_ks_t ks;
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union {
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uint8_t bytes[16];
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uint32_t words[4];
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} counter;
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uint64_t reseed_counter;
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} CTR_DRBG_STATE;
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// See SP 800-90Ar1, table 3.
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#define CTR_DRBG_ENTROPY_LEN 48
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// CTR_DRBG_init initialises |*drbg| given |CTR_DRBG_ENTROPY_LEN| bytes of
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// entropy in |entropy| and, optionally, a personalization string up to
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// |CTR_DRBG_ENTROPY_LEN| bytes in length. It returns one on success and zero
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// on error.
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int CTR_DRBG_init(CTR_DRBG_STATE *drbg,
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const uint8_t entropy[CTR_DRBG_ENTROPY_LEN],
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const uint8_t *personalization,
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size_t personalization_len);
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// CTR_DRBG_reseed reseeds |drbg| given |CTR_DRBG_ENTROPY_LEN| bytes of entropy
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// in |entropy| and, optionally, up to |CTR_DRBG_ENTROPY_LEN| bytes of
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// additional data. It returns one on success or zero on error.
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int CTR_DRBG_reseed(CTR_DRBG_STATE *drbg,
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const uint8_t entropy[CTR_DRBG_ENTROPY_LEN],
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const uint8_t *additional_data,
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size_t additional_data_len);
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// CTR_DRBG_generate processes to up |CTR_DRBG_ENTROPY_LEN| bytes of additional
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// data (if any) and then writes |out_len| random bytes to |out|. It returns one on success or
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// zero on error.
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int CTR_DRBG_generate(CTR_DRBG_STATE *drbg, uint8_t *out,
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size_t out_len,
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const uint8_t *additional_data,
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size_t additional_data_len);
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// CTR_DRBG_clear zeroises the state of |drbg|.
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void CTR_DRBG_clear(CTR_DRBG_STATE *drbg);
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#if defined(__cplusplus)
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} // extern C
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#endif
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