Linux Encryption

This is a discussion on Linux Encryption within the C Programming forums, part of the General Programming Boards category; Code: /* * Encrypt * encrypt.c * compile on linux; use: * gcc -o encrypt -lcrypt encrypt.c * (C) Lucas ...

  1. #1
    Comment your source code! Lynux-Penguin's Avatar
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    Cool Linux Encryption

    Code:
    /*
     * Encrypt
     * encrypt.c
     * compile on linux; use:
     * gcc -o encrypt -lcrypt encrypt.c
     * (C) Lucas Campbell 2001-2002
     */
    
    
    #include <stdio.h>
    int main(int argc, char* argv[])
    {
    	if(argv[1] != NULL) {
    		printf("%s is encrypted using md5 as:\n",argv[1]);
    		printf("%s\n",crypt(argv[1],"$1$kL10as");
    	}
    	else {
    		ptintf("Need to add the string to be encrypted\n");
    		printf("Example: encrypt [text here]\n");
    	}
    	return 0;
    }
    
    // See top for details
    now I am wondering how I can make a random salt that is 9 characters long but the first 3 are "$1$" because that initiates the md5 encryption algorithm.
    Any help will be appreciated
    The encryption program is mine and feel free to use it and distribute it as long as it contains the above information about compilation, copyright and the author.
    Asking the right question is sometimes more important than knowing the answer.
    Please read the FAQ
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  2. #2
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    Good thing you have that copyright notice there. You never know when some unscrupulous hacker is going to steal your code and make millions.

  3. #3
    ATH0 quzah's Avatar
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    > now I am wondering how I can make a random salt that is 9
    > characters long but

    Here's a thought!

    srand( time( 0 ) );
    sprintf( buf "$s$%06d", rand()%1000000 );

    Quzah.
    Hope is the first step on the road to disappointment.

  4. #4
    Comment your source code! Lynux-Penguin's Avatar
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    Thanks, but that didn't really work.


    What I want to do is place $1$letter in an array of nine
    like:
    Code:
    [$][1][$][r][r][r][r][r][r]
    where each r is replaced with a random character
    problem is assigning more than one random integer!
    Asking the right question is sometimes more important than knowing the answer.
    Please read the FAQ
    C Reference Card (A MUST!)
    Pointers and Memory
    The Essentials
    CString lib

  5. #5
    ATH0 quzah's Avatar
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    Yawn.

    #define R ((rand()%127)+1)
    sprinf( buf, "$s$%c%c%c%c%c%c",R,R,R,R,R,R );


    Or, if they have to be printable character:
    int R(void){int c=-1; while(!isprint(c))c=rand()%256;return c;}

    sprinf( buf, "$s$%c%c%c%c%c%c",R(),R(),R(),R(),R(),R() );

    Wheee...


    Quzah.
    Hope is the first step on the road to disappointment.

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