Diff: hash/HMAC.cpp

Revision:

10:bc9c23aa3870

Child:

11:96d87a5394ee

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hash/HMAC.cpp	Tue Sep 24 07:19:04 2013 +0000
@@ -0,0 +1,43 @@
+#include "HMAC.h"
+#include <string.h>
+
+HMAC::HMAC(HashAlgorithm *hashAlgo, uint8_t *k, uint32_t kl):
+algo(hashAlgo),
+keyLength(kl)
+{
+    memcpy(key, k, keyLength);
+    uint8_t buffer[64];
+    memcpy(buffer, key, keyLength);
+    memset(&buffer[keyLength], 0, 64-keyLength);  
+    
+    for(int i = 0; i < 64; ++i)
+        buffer[i] ^= 0x36;
+        
+    algo->update(buffer, 64);
+}
+
+HMAC::~HMAC()
+{
+    delete algo;
+}
+
+void HMAC::update(uint8_t *data, uint32_t length)
+{
+    algo->update(data, length);
+}
+
+void HMAC::finalize(uint8_t *hash)
+{
+    uint8_t buffer[64], buffer2[64];
+    algo->finalize(buffer);
+    
+    memcpy(buffer2, key, keyLength);
+    memset(&buffer2[keyLength], 0, keyLength);
+    for(int i = 0; i < 64; ++i)
+        buffer2[i] ^= 0x5C;
+        
+    algo->update(buffer2, 64);
+    algo->update(buffer, algo->outputSize());
+    algo->finalize(hash);
+}
+