Bitcoin Core  0.20.99
P2P Digital Currency
hkdf_sha256_32.cpp
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1 // Copyright (c) 2018-2019 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 
6 
7 #include <assert.h>
8 #include <string.h>
9 
10 CHKDF_HMAC_SHA256_L32::CHKDF_HMAC_SHA256_L32(const unsigned char* ikm, size_t ikmlen, const std::string& salt)
11 {
12  CHMAC_SHA256((const unsigned char*)salt.data(), salt.size()).Write(ikm, ikmlen).Finalize(m_prk);
13 }
14 
15 void CHKDF_HMAC_SHA256_L32::Expand32(const std::string& info, unsigned char hash[OUTPUT_SIZE])
16 {
17  // expand a 32byte key (single round)
18  assert(info.size() <= 128);
19  static const unsigned char one[1] = {1};
20  CHMAC_SHA256(m_prk, 32).Write((const unsigned char*)info.data(), info.size()).Write(one, 1).Finalize(hash);
21 }
void Expand32(const std::string &info, unsigned char hash[OUTPUT_SIZE])
A hasher class for HMAC-SHA-256.
Definition: hmac_sha256.h:14
static const size_t OUTPUT_SIZE
CHMAC_SHA256 & Write(const unsigned char *data, size_t len)
Definition: hmac_sha256.h:24
CHKDF_HMAC_SHA256_L32(const unsigned char *ikm, size_t ikmlen, const std::string &salt)
void Finalize(unsigned char hash[OUTPUT_SIZE])
Definition: hmac_sha256.cpp:29
unsigned char m_prk[32]