1 /***********************************************************************
2  * Copyright (c) 2014 Pieter Wuille                                    *
3  * Distributed under the MIT software license, see the accompanying    *
4  * file COPYING or https://www.opensource.org/licenses/mit-license.php.*
5  ***********************************************************************/
6 
7 #ifndef SECP256K1_HASH_H
8 #define SECP256K1_HASH_H
9 
10 #include <stdlib.h>
11 #include <stdint.h>
12 
13 typedef struct {
14     uint32_t s[8];
15     uint32_t buf[16]; /* In big endian */
16     size_t bytes;
17 } secp256k1_sha256;
18 
19 static void secp256k1_sha256_initialize(secp256k1_sha256 *hash);
20 static void secp256k1_sha256_write(secp256k1_sha256 *hash, const unsigned char *data, size_t size);
21 static void secp256k1_sha256_finalize(secp256k1_sha256 *hash, unsigned char *out32);
22 
23 typedef struct {
24     secp256k1_sha256 inner, outer;
25 } secp256k1_hmac_sha256;
26 
27 static void secp256k1_hmac_sha256_initialize(secp256k1_hmac_sha256 *hash, const unsigned char *key, size_t size);
28 static void secp256k1_hmac_sha256_write(secp256k1_hmac_sha256 *hash, const unsigned char *data, size_t size);
29 static void secp256k1_hmac_sha256_finalize(secp256k1_hmac_sha256 *hash, unsigned char *out32);
30 
31 typedef struct {
32     unsigned char v[32];
33     unsigned char k[32];
34     int retry;
35 } secp256k1_rfc6979_hmac_sha256;
36 
37 static void secp256k1_rfc6979_hmac_sha256_initialize(secp256k1_rfc6979_hmac_sha256 *rng, const unsigned char *key, size_t keylen);
38 static void secp256k1_rfc6979_hmac_sha256_generate(secp256k1_rfc6979_hmac_sha256 *rng, unsigned char *out, size_t outlen);
39 static void secp256k1_rfc6979_hmac_sha256_finalize(secp256k1_rfc6979_hmac_sha256 *rng);
40 
41 #endif /* SECP256K1_HASH_H */
42