Browse Source Download (without any required ccan dependencies)

Module:

crypto/hmac_sha256

Summary:

RFC2104 HMAC using SHA256.

Maintainer:

Rusty Russell <[email protected]>

Dependencies:

Description:

This code implements RFC2104, which is a fairly standard HMAC.

Example:

#include <ccan/crypto/hmac_sha256/hmac_sha256.h>
#include <err.h>
#include <stdio.h>
#include <string.h>

// Simple demonstration: idential strings will have the same hash, but
// two different strings will not.
int main(int argc, char *argv[])
{
        struct hmac_sha256 hash1, hash2;

        if (argc != 3)
                errx(1, "Usage: %s <string1> <string2>", argv[0]);

        hmac_sha256(&hash1, "key", 3, argv[1], strlen(argv[1]));
        hmac_sha256(&hash2, "key", 3, argv[2], strlen(argv[2]));
        printf("Hash is %s\n", memcmp(&hash1, &hash2, sizeof(hash1))
                ? "different" : "same");
        return 0;
}

License:

BSD-MIT