Solved

c++ MD5 Hash WINAPI

Posted on 2015-01-01
3
414 Views
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;

	}	
}

Open in new window


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
Comment
Question by:Júlio
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
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]);
		}

Open in new window

0
 

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.
0

Featured Post

VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Ever wondered why Windows 8 and 10 don't seem to accept your GPO-based software deployment while Windows 7 does? Read on.
Sometimes drives fill up and we don't know why.  If you don't understand the best way to use the tools available, you may end up being stumped as to why your drive says it's not full when you have no space left!  Here's how you can find out...
This Micro Tutorial will show you how to maximize your wireless card to its maximum capability. This will be demonstrated using Intel(R) Centrino(R) Wireless-N 2230 wireless card on Windows 8 operating system.
The viewer will learn how to clear a vector as well as how to detect empty vectors in C++.

630 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question