/** * Copyright (c) 2019 Andrew R. Kozlik * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. */ #ifndef __HMAC_DRBG_H__ #define __HMAC_DRBG_H__ #include <sha2.h> #include <stdint.h> // HMAC based Deterministic Random Bit Generator with SHA-256 typedef struct _HMAC_DRBG_CTX { uint32_t odig[SHA256_DIGEST_LENGTH / sizeof(uint32_t)]; uint32_t idig[SHA256_DIGEST_LENGTH / sizeof(uint32_t)]; uint32_t v[SHA256_BLOCK_LENGTH / sizeof(uint32_t)]; } HMAC_DRBG_CTX; void hmac_drbg_init(HMAC_DRBG_CTX *ctx, const uint8_t *buf, size_t len, const uint8_t *nonce, size_t nonce_len); void hmac_drbg_reseed(HMAC_DRBG_CTX *ctx, const uint8_t *buf, size_t len, const uint8_t *addin, size_t addin_len); void hmac_drbg_generate(HMAC_DRBG_CTX *ctx, uint8_t *buf, size_t len); #endif