Bitcoin Core  0.20.99
P2P Digital Currency
hmac_sha256.cpp
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1 // Copyright (c) 2014-2018 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 <string.h>
8 
9 CHMAC_SHA256::CHMAC_SHA256(const unsigned char* key, size_t keylen)
10 {
11  unsigned char rkey[64];
12  if (keylen <= 64) {
13  memcpy(rkey, key, keylen);
14  memset(rkey + keylen, 0, 64 - keylen);
15  } else {
16  CSHA256().Write(key, keylen).Finalize(rkey);
17  memset(rkey + 32, 0, 32);
18  }
19 
20  for (int n = 0; n < 64; n++)
21  rkey[n] ^= 0x5c;
22  outer.Write(rkey, 64);
23 
24  for (int n = 0; n < 64; n++)
25  rkey[n] ^= 0x5c ^ 0x36;
26  inner.Write(rkey, 64);
27 }
28 
29 void CHMAC_SHA256::Finalize(unsigned char hash[OUTPUT_SIZE])
30 {
31  unsigned char temp[32];
32  inner.Finalize(temp);
33  outer.Write(temp, 32).Finalize(hash);
34 }
CSHA256 & Write(const unsigned char *data, size_t len)
Definition: sha256.cpp:637
CSHA256 inner
Definition: hmac_sha256.h:18
CHMAC_SHA256(const unsigned char *key, size_t keylen)
Definition: hmac_sha256.cpp:9
CSHA256 outer
Definition: hmac_sha256.h:17
void Finalize(unsigned char hash[OUTPUT_SIZE])
Definition: sha256.cpp:663
void Finalize(unsigned char hash[OUTPUT_SIZE])
Definition: hmac_sha256.cpp:29
void * memcpy(void *a, const void *b, size_t c)
static const size_t OUTPUT_SIZE
Definition: hmac_sha256.h:21
A hasher class for SHA-256.
Definition: sha256.h:13