Browse Source Download (without any required ccan dependencies)

Module:

crc

Summary:

routines for crc of bytes

Maintainer:

Rusty Russell <rusty@rustcorp.com.au>

Author:

Gary S. Brown, Clay Haapala

Dependencies:

Description:

Cyclic Redundancy Check routines. These are reasonably fast checksum routines, but not suitable for cryptographic use.

They are useful for simple error detection, eg. a 32-bit CRC will detect a single error burst of up to 32 bits.

Example:

#include <ccan/crc/crc.h>
#include <stdio.h>
#include <stdlib.h>

// Given IHATEMATH outputs 0x98a3b8df
int main(int argc, char *argv[])
{
        if (argc != 2) {
                fprintf(stderr, "Usage: %s <string>\n"
                        "Prints 32 bit CRC of the string\n", argv[0]);
                exit(1);
        }
        printf("0x%08x\n", crc32c(0, argv[1], strlen(argv[1])));
        exit(0);
}

License:

GPL (v2 or any later version)