Beispiel #1
0
/* This function instead of just computing the SHA1 and xoring it
 * against digest, also perform the digest of "digest" itself and
 * replace the old value with the new one.
 *
 * So the final digest will be:
 *
 * digest = SHA1(digest xor SHA1(data))
 *
 * This function is used every time we want to preserve the order so
 * that digest(a,b,c,d) will be different than digest(b,c,d,a)
 *
 * Also note that mixdigest("foo") followed by mixdigest("bar")
 * will lead to a different digest compared to "fo", "obar".
 */
void mixDigest(unsigned char *digest, void *ptr, size_t len) {
    SHA1_CTX ctx;
    char *s = ptr;

    xorDigest(digest,s,len);
    SHA1Init(&ctx);
    SHA1Update(&ctx,digest,20);
    SHA1Final(digest,&ctx);
}
Beispiel #2
0
void xorObjectDigest(unsigned char* digest, robj* o)
{
    o = getDecodedObject(o);
    xorDigest(digest, o->ptr, sdslen(o->ptr));
    decrRefCount(o);
}