Revamp digest functions

- Hash() has been removed because it was ambiguous, Md5() and Sha0() are proper replacements.
- HMacMd5() and HMacSha1() now share a common implementation handled by the new Internal_HMac() function.
- NewMd() and MdProcess() now support plain hashing (without the key).
- NewMd(), SetMdKey() and MdProcess() now check the OpenSSL functions' return value and in case of failure a debug message is printed along with the error string, if available.
- SetMdKey()'s return value has been changed from void to bool, so that it's possible to know whether the function succeeded or not.
- MdProcess()' return value has been changed from void to UINT (unsigned int) and the function now returns the number of bytes written by HMAC_Final() or EVP_DigestFinal_ex().

src/Cedar/Radius.c

@@ -2396,7 +2396,7 @@ BUF *RadiusEncryptPassword(char *password, UCHAR *random, UCHAR *secret, UINT se
 		{
 			WriteBuf(tmp, c[i - 1], 16);
 		}
-		Hash(b[i], tmp->Buf, tmp->Size, false);
+		Md5(b[i], tmp->Buf, tmp->Size);
 		FreeBuf(tmp);
 
 		// Calculation of c[i]