aboutsummaryrefslogtreecommitdiff
path: root/src/crypto
diff options
context:
space:
mode:
Diffstat (limited to 'src/crypto')
-rw-r--r--src/crypto/hmac_sha256.cpp34
-rw-r--r--src/crypto/hmac_sha256.h32
2 files changed, 66 insertions, 0 deletions
diff --git a/src/crypto/hmac_sha256.cpp b/src/crypto/hmac_sha256.cpp
new file mode 100644
index 0000000000..435896538b
--- /dev/null
+++ b/src/crypto/hmac_sha256.cpp
@@ -0,0 +1,34 @@
+// 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/hmac_sha256.h"
+
+#include <string.h>
+
+CHMAC_SHA256::CHMAC_SHA256(const unsigned char* key, size_t keylen)
+{
+ unsigned char rkey[64];
+ if (keylen <= 64) {
+ memcpy(rkey, key, keylen);
+ memset(rkey + keylen, 0, 64 - keylen);
+ } else {
+ CSHA256().Write(key, keylen).Finalize(rkey);
+ memset(rkey + 32, 0, 32);
+ }
+
+ for (int n = 0; n < 64; n++)
+ rkey[n] ^= 0x5c;
+ outer.Write(rkey, 64);
+
+ for (int n = 0; n < 64; n++)
+ rkey[n] ^= 0x5c ^ 0x36;
+ inner.Write(rkey, 64);
+}
+
+void CHMAC_SHA256::Finalize(unsigned char hash[OUTPUT_SIZE])
+{
+ unsigned char temp[32];
+ inner.Finalize(temp);
+ outer.Write(temp, 32).Finalize(hash);
+}
diff --git a/src/crypto/hmac_sha256.h b/src/crypto/hmac_sha256.h
new file mode 100644
index 0000000000..4ceac70944
--- /dev/null
+++ b/src/crypto/hmac_sha256.h
@@ -0,0 +1,32 @@
+// 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.
+
+#ifndef BITCOIN_HMAC_SHA256_H
+#define BITCOIN_HMAC_SHA256_H
+
+#include "crypto/sha256.h"
+
+#include <stdint.h>
+#include <stdlib.h>
+
+/** A hasher class for HMAC-SHA-512. */
+class CHMAC_SHA256
+{
+private:
+ CSHA256 outer;
+ CSHA256 inner;
+
+public:
+ static const size_t OUTPUT_SIZE = 32;
+
+ CHMAC_SHA256(const unsigned char* key, size_t keylen);
+ CHMAC_SHA256& Write(const unsigned char* data, size_t len)
+ {
+ inner.Write(data, len);
+ return *this;
+ }
+ void Finalize(unsigned char hash[OUTPUT_SIZE]);
+};
+
+#endif // BITCOIN_SHA256_H