New git repository for release - version 0.2.0 tagged

1 files changed, 81 insertions, 0 deletions

diff --git a/node/HMAC.cpp b/node/HMAC.cpp
new file mode 100644
index 00000000..d8a756a9
--- /dev/null
+++ b/node/HMAC.cpp
@@ -0,0 +1,81 @@
+/*
+ * ZeroTier One - Global Peer to Peer Ethernet
+ * Copyright (C) 2012-2013  ZeroTier Networks LLC
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * --
+ *
+ * ZeroTier may be used and distributed under the terms of the GPLv3, which
+ * are available at: http://www.gnu.org/licenses/gpl-3.0.html
+ *
+ * If you would like to embed ZeroTier into a commercial application or
+ * redistribute it in a modified binary form, please contact ZeroTier Networks
+ * LLC. Start here: http://www.zerotier.com/
+ */
+
+#include "HMAC.hpp"
+
+#include <openssl/sha.h>
+
+namespace ZeroTier {
+
+void HMAC::sha256(const void *key,unsigned int klen,const void *message,unsigned int len,void *mac)
+	throw()
+{
+	union {
+		uint64_t q[12];
+		uint8_t b[96];
+	} key2,opad,ipad;
+	SHA256_CTX sha;
+
+	if (klen == 32) { // this is what we use, so handle this quickly
+		key2.q[0] = ((const uint64_t *)key)[0];
+		key2.q[1] = ((const uint64_t *)key)[1];
+		key2.q[2] = ((const uint64_t *)key)[2];
+		key2.q[3] = ((const uint64_t *)key)[3];
+		key2.q[4] = 0ULL;
+		key2.q[5] = 0ULL;
+		key2.q[6] = 0ULL;
+		key2.q[7] = 0ULL;
+	} else { // for correctness and testing against test vectors
+		if (klen > 64) {
+			SHA256_Init(&sha);
+			SHA256_Update(&sha,key,klen);
+			SHA256_Final(key2.b,&sha);
+			klen = 32;
+		} else {
+			for(unsigned int i=0;i<klen;++i)
+				key2.b[i] = ((const uint8_t *)key)[i];
+		}
+		while (klen < 64)
+			key2.b[klen++] = (uint8_t)0;
+	}
+
+	for(unsigned int i=0;i<8;++i)
+		opad.q[i] = 0x5c5c5c5c5c5c5c5cULL ^ key2.q[i];
+	for(unsigned int i=0;i<8;++i)
+		ipad.q[i] = 0x3636363636363636ULL ^ key2.q[i];
+
+	SHA256_Init(&sha);
+	SHA256_Update(&sha,(const unsigned char *)ipad.b,64);
+	SHA256_Update(&sha,(const unsigned char *)message,len);
+	SHA256_Final((unsigned char *)(opad.b + 64),&sha);
+
+	SHA256_Init(&sha);
+	SHA256_Update(&sha,opad.b,96);
+	SHA256_Final((unsigned char *)mac,&sha);
+}
+
+} // namespace ZeroTier