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c++ MD5 Hash WINAPI

Hello,

I'm trying to reproduce this example from MSDN: http://msdn.microsoft.com/en-us/library/aa382380%28VS.85%29.aspx

I'm using Windows 8.1 and i''m getting error 87 in CryptGetHashParam api, but i'm sure that i don't have a parameter problem:

bool Md5::HashCrypt(){
	BOOL fileReaded = FALSE;
	BYTE fileBuff[1024];
	DWORD hash = BUFF_MD5;
	BYTE hashBuff[MAX_PATH];	
	//read file content and fill hash object
	while (fileReaded  = ReadFile(fileHandle, fileBuff, BUFF_SIZE, &nBytes, NULL)){
		if (!fileReaded){
			ToClose();
			cout << "ReadFile Fails." << endl;
			return false;
		}
		if (nBytes == 0){
			break;
		}		
		if (!CryptHashData(cryptObject, fileBuff, nBytes, 0)){
			ToClose();
			cout << "CryptHashData Fails." << endl;
			return false;
		}
	}

	CHAR key[] = "0123456789abcdef";
	if (CryptGetHashParam(crypHandle, HP_HASHSIZE, hashBuff, &hash, 0)){
		cout << "-> MD5:\n " << endl;
		for (DWORD i = 0; i < hash; i++){
			printf("%c%c", key[hashBuff[i] >> 4],
				key[hashBuff[i] & 0xf]);
		}

		ToClose();
		return true;
	}
	else{
		DWORD status = GetLastError();
		ToClose();
		cout << "CryptGetHashParam Fails. Error: " << status << endl;
		return false;

	}	
}

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I'm out of idea and Google is not helping. I want to get the md5 hash of my program in run-time and display it.

classes.hmain.cppmd5Functions.cpp
0
Júlio
Asked:
Júlio
  • 2
1 Solution
 
jkrCommented:
In yoiur call to 'CryptGetHashParam()', you are using 'crypHandle' as the 1st parameter, whereas you are using 'cryptObject' in the previous calls to 'CryptHashData()'. You should use 'cryptObject' here as well (at least that's what the MSDN code does with 'hHash'), i.e.

	if (CryptGetHashParam(cryptObject, HP_HASHSIZE, hashBuff, &hash, 0)){ // <-- here
		cout << "-> MD5:\n " << endl;
		for (DWORD i = 0; i < hash; i++){
			printf("%c%c", key[hashBuff[i] >> 4],
				key[hashBuff[i] & 0xf]);
		}

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0
 
JúlioAuthor Commented:
You are absolutely right!
but the result doesn't look like a MD5:

result
0
 
JúlioAuthor Commented:
he fixed it for me!

But my final MD5 doesn't looks like a MD5, so i'm asking in the same question about it.

He deserve the solution points.
0

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