very hash in one pass

ElGamal.h

@@ -60,15 +60,13 @@ namespace crypto
 	{
 		CryptoPP::Integer x(key, 256), a(zeroPadding? encrypted +1 : encrypted, 256), 
 			b(zeroPadding? encrypted + 258 :encrypted + 256, 256);
-		uint8_t m[255], hash[32];
+		uint8_t m[255];
 		a_times_b_mod_c (b, a_exp_b_mod_c (a, elgp - x - 1, elgp), elgp).Encode (m, 255);
-		CryptoPP::SHA256().CalculateDigest(hash, m+33, 222);
-		for (int i = 0; i < 32; i++)
-			if (hash[i] != m[i+1])
-			{
-				LogPrint ("ElGamal decrypt hash doesn't match");
-				return false;
-			}
+		if (!CryptoPP::SHA256().VerifyDigest (m + 1, m + 33, 222))
+		{
+			LogPrint ("ElGamal decrypt hash doesn't match");
+			return false;
+		}
 		memcpy (data, m + 33, 222);
 		return true;
 	}