Bitcoin ABC  0.22.12
P2P Digital Currency
hmac_sha256.cpp
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1 // Copyright (c) 2014 The Bitcoin Core developers
2 // Distributed under the MIT software license, see the accompanying
3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 
5 #include <crypto/hmac_sha256.h>
6 
7 #include <cstring>
8 
9 CHMAC_SHA256::CHMAC_SHA256(const uint8_t *key, size_t keylen) {
10  uint8_t rkey[64];
11  if (keylen <= 64) {
12  memcpy(rkey, key, keylen);
13  memset(rkey + keylen, 0, 64 - keylen);
14  } else {
15  CSHA256().Write(key, keylen).Finalize(rkey);
16  memset(rkey + 32, 0, 32);
17  }
18 
19  for (int n = 0; n < 64; n++) {
20  rkey[n] ^= 0x5c;
21  }
22  outer.Write(rkey, 64);
23 
24  for (int n = 0; n < 64; n++) {
25  rkey[n] ^= 0x5c ^ 0x36;
26  }
27  inner.Write(rkey, 64);
28 }
29 
30 void CHMAC_SHA256::Finalize(uint8_t hash[OUTPUT_SIZE]) {
31  uint8_t temp[32];
32  inner.Finalize(temp);
33  outer.Write(temp, 32).Finalize(hash);
34 }
CHMAC_SHA256(const uint8_t *key, size_t keylen)
Definition: hmac_sha256.cpp:9
CSHA256 inner
Definition: hmac_sha256.h:17
CSHA256 outer
Definition: hmac_sha256.h:16
void Finalize(uint8_t hash[OUTPUT_SIZE])
Definition: sha256.cpp:844
static const size_t OUTPUT_SIZE
Definition: hmac_sha256.h:20
CSHA256 & Write(const uint8_t *data, size_t len)
Definition: sha256.cpp:819
A hasher class for SHA-256.
Definition: sha256.h:13
void Finalize(uint8_t hash[OUTPUT_SIZE])
Definition: hmac_sha256.cpp:30