[SOLVED] storing MD5 generated key in string variable

yahoosam · 08-23-2012, 09:08 AM

i stuck with something like..
i am having cipher-Key which is being generated through MD5 Algo & printing likewise below:

Code:

for (i = 0; i < 16; i++) {
                printf ("%02x", digest[i]);
        }

output:d41d8cd98f00b204e9800998ecf8427e
need to know how to store same output in string variable.

NevemTeve · 08-23-2012, 09:19 AM

sprintf is your friend:

Code:

char buff [16*2+1], *p= buff;

for (i = 0; i < 16; i++) {
    p += sprintf (p, "%02x", digest[i]);
}

byannoni · 08-23-2012, 09:20 AM

Code:

for (i = 0; i < 16; i++)
{
    sprintf( string_ptr, "%02x", digest[i]);
}

Edit:
NevemTeve's example is better

yahoosam · 08-24-2012, 02:05 AM

dear NevemTeve!!
can you please assist me two things..

Code:

char buff [16*2+1]
/*why this size : 16*2+1*/
and
p += sprintf (...);
/*please add your comment*/

thanks!

byannoni · 08-24-2012, 07:45 AM

Quote:

Originally Posted by yahoosam

dear NevemTeve!!
can you please assist me two things..

Code:

char buff [16*2+1]
/*why this size : 16*2+1*/
and
p += sprintf (...);
/*please add your comment*/

thanks!

16 * 2 is 32 (the length of the MD5 sum)
32 + 1 leave a byte for the trailing null character.

NevemTeve · 08-24-2012, 11:06 AM

ad 1: already answered: 32 visible character + terminating zero
ad 2: here is a comment: sprintf is a very useful function.

theNbomr · 08-26-2012, 05:14 PM

The printf() family of functions return the number of bytes assigned to the output stream, string, or file (ie, the number of bytes printed). That fact is useful for code like:

Code:

p += sprintf (...);

when used in a loop, iteratively appending to the string.

--- rod.

yahoosam · 08-28-2012, 12:33 AM

ThanQ,vry much all of you!!