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Archive for October, 2010

Using SHA1() function

October 6, 2010 9 comments

Hi. I’ ll show you how to convert any string into a SHA1 hash using the openssl library.
To use this library you must include in your codes this:

#include <openssl/sha.h>

Moreover you have to compile the source with the “-lssl” flag.
The following code takes in input a string (argv[1]) and generates an hash string through the SHA1() function. The value of “SHA_DIGEST_LENGTH” is 20 bytes, that is the dimension of SHA1 output.
This function stores the value computed in “temp” variable.
Then in the for loop, I copy the value of “temp” into “buf”, according to the standard format of SHA1 strings.

#include <stdio.h>
#include <string.h>
#include <openssl/sha.h>

int main(int argn, char *argv[]) {

	int i = 0;
	unsigned char temp[SHA_DIGEST_LENGTH];
	char buf[SHA_DIGEST_LENGTH*2];

	if ( argn != 2 ) {
		printf("Usage: %s string\n", argv[0]);
		return -1;
	}

	memset(buf, 0x0, SHA_DIGEST_LENGTH*2);
	memset(temp, 0x0, SHA_DIGEST_LENGTH);

	SHA1((unsigned char *)argv[1], strlen(argv[1]), temp);

	for (i=0; i < SHA_DIGEST_LENGTH; i++) {
		sprintf((char*)&(buf[i*2]), "%02x", temp[i]);
	}

	printf("SHA1 of %s is %s\n", argv[1], buf);

	return 0;

}

We can compile and run it as follows:

$ gcc sha.c -lssl -o sha
$ ./sha asd
SHA1 of asd is f10e2821bbbea527ea02200352313bc059445190

If you want know something else of SHA1() function you can use the manpages:

man 3 sha1

Or look up in openssl website: link

Thinkpad IBM audio buttons

October 6, 2010 Leave a comment

Hi.
Do you have an ibm thinkpad?
Do you have gnome?
Do you have ubuntu?
You can not associate the hardware audio buttons with the volume indicator?
The most likely solution is to add ONE of the following lines to the “/etc/rc.local” file:

cp /sys/devices/platform/thinkpad_acpi/hotkey_all_mask /sys/devices/platform/thinkpad_acpi/hotkey_mask

Or:

echo 0x00ffffff > /proc/acpi/ibm/hotkey

… and, maybe, the buttons will work… :)

Piracy VS Theft

October 6, 2010 Leave a comment

Because the piracy is not theft…

Piracy-vs-Theft

Categories: Bullshit

India’s Code

October 5, 2010 1 comment

Hello. I do not remember where I found the code that follows, so I don’t know who was the real
owner of this beauty (all rights to the original creator).
It is an obfuscated code in C language:

#include <stdio.h>

void main()
{
   
   int a, b = 10, c;
   int count = 1;
   
   for (b=c=10; a="- FIGURE?, UMKC,XYZHello Folks,\
		  TFy!QJu ROo TNn(ROo)SLq SLq ULo+\
		  UHs UJq TNn*RPn/QPbEWS_JSWQAIJO^\
		  NBELPeHBFHT}TnALVlBLOFAkHFOuFETp\
		  HCStHAUFAgcEAelclcn^r^r\\tZvYxXy\
		  T|S~Pn SPm SOn TNn ULo0ULo#ULo-W\
		  Hq!WFs XDt!" [b+++21]; )
		  
     for(; a-- > 64 ; )
       putchar ( ++c=='Z' ? c = c/ 9:33^b&1);
}

Try to run it… amazing, is not it?

Read more…

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