Diff: webpki/HMACCore.cpp

Revision:

0:1728f99b19f6

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/webpki/HMACCore.cpp	Tue Dec 29 21:08:18 2009 +0000
@@ -0,0 +1,75 @@
+/* ====================================================================
+ * Copyright (c) 1998-2010 The OpenSSL Project.  All rights reserved.
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ * ====================================================================
+ * C++ adoption was made by Anders Rundgren (anders.rundgren@telia.com)
+ * ====================================================================
+ */
+
+#include <string.h>
+#include <stdlib.h>
+
+#include "crypto.h"
+
+
+namespace webpki
+{
+
+HMACCore::HMACCore (SHACore& outer, SHACore& inner)
+  {
+	m_outer_save = &outer;
+	m_inner_save = &inner;
+	m_error = NULL;
+  }
+
+
+void HMACCore::init (const unsigned char* key, int key_length)
+  {
+	unsigned char padded_key[SHACore::SHA_CBLOCK];
+	if (key_length > SHACore::SHA_CBLOCK)
+	  {
+		m_inner_save->doFinal (padded_key, key, key_length);
+		key_length = m_inner_save->m_sha_ctx.digest_length;
+	  }
+	else
+	  {
+		memcpy (padded_key, key, key_length);
+	  }
+	for (int i = 0; i < SHACore::SHA_CBLOCK; i++)
+	  {
+		padded_key[i] = i < key_length ? padded_key[i] ^ 0x36 : 0x36;
+	  }
+	m_inner_save->update (padded_key, SHACore::SHA_CBLOCK);
+	for (int i = 0; i < SHACore::SHA_CBLOCK; i++)
+	  {
+		padded_key[i] = i < key_length ? padded_key[i] ^ (0x36 ^ 0x5c) : 0x5c;
+	  }
+	m_outer_save->update (padded_key, SHACore::SHA_CBLOCK);
+  }
+
+
+void HMACCore::update (const unsigned char* data, int length)
+  {
+	m_inner_save->update (data, length);
+  }
+
+
+const char* HMACCore::doFinal (unsigned char* digest)
+  {
+	unsigned char inner_digest[SHA256Provider::DIGEST_LENGTH];
+	m_inner_save->doFinal (inner_digest);
+	return m_outer_save->doFinal (digest, inner_digest, m_inner_save->m_sha_ctx.digest_length);
+  }
+
+
+const char* HMACCore::doFinal (unsigned char* digest, const unsigned char* data, int length)
+  {
+	update (data, length);
+	return doFinal (digest);
+  }
+
+}