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c++ MD5 Hash WINAPI

Posted on 2015-01-01
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Last Modified: 2015-01-02
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
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Question by:Júlio
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3 Comments
 
LVL 86

Accepted Solution

by:
jkr earned 500 total points
ID: 40526618
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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Author Comment

by:Júlio
ID: 40527672
You are absolutely right!
but the result doesn't look like a MD5:

result
0
 

Author Closing Comment

by:Júlio
ID: 40527676
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.
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