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author | Wladimir J. van der Laan <laanwj@gmail.com> | 2014-12-01 14:57:49 +0100 |
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committer | Wladimir J. van der Laan <laanwj@gmail.com> | 2014-12-01 14:57:58 +0100 |
commit | f0877f8b6200dcf6df12df5e69d498d365f81f8b (patch) | |
tree | dc5f63386a9c0752a62301a815d6a976286a1b42 /src/crypto/rfc6979_hmac_sha256.cpp | |
parent | 89151d9f29870cc9246f76baba75b75d3a7528d7 (diff) | |
parent | 4cdaa95a209808276992dc1eb0ed0773f7927073 (diff) | |
download | bitcoin-f0877f8b6200dcf6df12df5e69d498d365f81f8b.tar.xz |
Merge pull request #5227
4cdaa95 Resize after succesful result (Pieter Wuille)
9d8604f Header define style cleanups (Pieter Wuille)
a53fd41 Deterministic signing (Pieter Wuille)
3060e36 Add the RFC6979 PRNG (Pieter Wuille)
a8f5087 Add HMAC-SHA256 (Pieter Wuille)
36fa4a7 Split up crypto/sha2 (Pieter Wuille)
Diffstat (limited to 'src/crypto/rfc6979_hmac_sha256.cpp')
-rw-r--r-- | src/crypto/rfc6979_hmac_sha256.cpp | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/src/crypto/rfc6979_hmac_sha256.cpp b/src/crypto/rfc6979_hmac_sha256.cpp new file mode 100644 index 0000000000..3f935abfea --- /dev/null +++ b/src/crypto/rfc6979_hmac_sha256.cpp @@ -0,0 +1,47 @@ +// Copyright (c) 2014 The Bitcoin developers +// Distributed under the MIT software license, see the accompanying +// file COPYING or http://www.opensource.org/licenses/mit-license.php. + +#include "crypto/rfc6979_hmac_sha256.h" + +#include <string.h> + +#include <algorithm> + +static const unsigned char zero[1] = {0x00}; +static const unsigned char one[1] = {0x01}; + +RFC6979_HMAC_SHA256::RFC6979_HMAC_SHA256(const unsigned char* key, size_t keylen, const unsigned char* msg, size_t msglen) : retry(false) +{ + memset(V, 0x01, sizeof(V)); + memset(K, 0x00, sizeof(K)); + + CHMAC_SHA256(K, sizeof(K)).Write(V, sizeof(V)).Write(zero, sizeof(zero)).Write(key, keylen).Write(msg, msglen).Finalize(K); + CHMAC_SHA256(K, sizeof(K)).Write(V, sizeof(V)).Finalize(V); + CHMAC_SHA256(K, sizeof(K)).Write(V, sizeof(V)).Write(one, sizeof(one)).Write(key, keylen).Write(msg, msglen).Finalize(K); + CHMAC_SHA256(K, sizeof(K)).Write(V, sizeof(V)).Finalize(V); +} + +RFC6979_HMAC_SHA256::~RFC6979_HMAC_SHA256() +{ + memset(V, 0x01, sizeof(V)); + memset(K, 0x00, sizeof(K)); +} + +void RFC6979_HMAC_SHA256::Generate(unsigned char* output, size_t outputlen) +{ + if (retry) { + CHMAC_SHA256(K, sizeof(K)).Write(V, sizeof(V)).Write(zero, sizeof(zero)).Finalize(K); + CHMAC_SHA256(K, sizeof(K)).Write(V, sizeof(V)).Finalize(V); + } + + while (outputlen > 0) { + CHMAC_SHA256(K, sizeof(K)).Write(V, sizeof(V)).Finalize(V); + size_t len = std::min(outputlen, sizeof(V)); + memcpy(output, V, len); + output += len; + outputlen -= len; + } + + retry = true; +} |