Bitcoin Core  0.19.99
P2P Digital Currency
hmac_sha512.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_sha512.h>
6 
7 #include <string.h>
8 
9 CHMAC_SHA512::CHMAC_SHA512(const unsigned char* key, size_t keylen)
10 {
11  unsigned char rkey[128];
12  if (keylen <= 128) {
13  memcpy(rkey, key, keylen);
14  memset(rkey + keylen, 0, 128 - keylen);
15  } else {
16  CSHA512().Write(key, keylen).Finalize(rkey);
17  memset(rkey + 64, 0, 64);
18  }
19 
20  for (int n = 0; n < 128; n++)
21  rkey[n] ^= 0x5c;
22  outer.Write(rkey, 128);
23 
24  for (int n = 0; n < 128; n++)
25  rkey[n] ^= 0x5c ^ 0x36;
26  inner.Write(rkey, 128);
27 }
28 
29 void CHMAC_SHA512::Finalize(unsigned char hash[OUTPUT_SIZE])
30 {
31  unsigned char temp[64];
32  inner.Finalize(temp);
33  outer.Write(temp, 64).Finalize(hash);
34 }
void Finalize(unsigned char hash[OUTPUT_SIZE])
Definition: hmac_sha512.cpp:29
static const size_t OUTPUT_SIZE
Definition: hmac_sha512.h:21
void Finalize(unsigned char hash[OUTPUT_SIZE])
Definition: sha512.cpp:185
CSHA512 outer
Definition: hmac_sha512.h:17
void * memcpy(void *a, const void *b, size_t c)
CSHA512 & Write(const unsigned char *data, size_t len)
Definition: sha512.cpp:159
CHMAC_SHA512(const unsigned char *key, size_t keylen)
Definition: hmac_sha512.cpp:9
A hasher class for SHA-512.
Definition: sha512.h:12
CSHA512 inner
Definition: hmac_sha512.h:18