SSUHeader and authenticate added

hmac.h

@@ -19,7 +19,7 @@ namespace crypto
 	// block size is 64 bytes	
 	{
 		size_t totalLen = len + 64 + 32; 
-		uint8_t * buf = new uint8_t[totalLen]; // TODO: reuse buffers
+		uint8_t buf[2048];
 		// ikeypad
 		((uint64_t *)buf)[0] = ((uint64_t *)key)[0] ^ IPAD; 
 		((uint64_t *)buf)[1] = ((uint64_t *)key)[1] ^ IPAD; 
@@ -51,7 +51,6 @@ namespace crypto
 		
 		// calculate digest
 		CryptoPP::Weak1::MD5().CalculateDigest (digest, buf, totalLen);
-		delete[] buf;
 	}
 }
 }