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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* lib/crypto/md5/t_cksum.c
*
* Copyright 1995 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*/
/*
* t_cksum.c - Test checksum and checksum compatability for rsa-md[4,5]-des
*/
#include "k5-int.h"
#define MD5_K5BETA_COMPAT
#define MD4_K5BETA_COMPAT
#if MD == 4
#define CKTYPE CKSUMTYPE_RSA_MD4_DES
#endif
#if MD == 5
#define CKTYPE CKSUMTYPE_RSA_MD5_DES
#endif
static void
print_checksum(char *text, int number, char *message, krb5_checksum *checksum)
{
unsigned int i;
printf("%s MD%d checksum(\"%s\") = ", text, number, message);
for (i=0; i<checksum->length; i++)
printf("%02x", (unsigned char) checksum->contents[i]);
printf("\n");
}
static void
parse_hexstring(const char *s, krb5_checksum *cksum)
{
size_t i, len;
unsigned int byte;
unsigned char *cp;
len = strlen(s);
cp = malloc(len / 2);
cksum->contents = cp;
if (cp == NULL) {
cksum->length = 0;
return;
}
cksum->length = len / 2;
for (i = 0; i + 1 < len; i += 2) {
sscanf(&s[i], "%2x", &byte);
*cp++ = byte;
}
cksum->checksum_type = CKTYPE;
cksum->magic = KV5M_CHECKSUM;
}
/*
* Test the checksum verification of Old Style (tm) and correct RSA-MD[4,5]-DES
* checksums.
*/
krb5_octet testkey[8] = { 0x45, 0x01, 0x49, 0x61, 0x58, 0x19, 0x1a, 0x3d };
int
main(argc, argv)
int argc;
char **argv;
{
int msgindex;
krb5_boolean valid;
krb5_keyblock keyblock;
krb5_key key;
krb5_error_code kret=0;
krb5_data plaintext;
krb5_checksum checksum, knowncksum;
/* this is a terrible seed, but that's ok for the test. */
plaintext.length = 8;
plaintext.data = (char *) testkey;
krb5_c_random_seed(/* XXX */ 0, &plaintext);
keyblock.enctype = ENCTYPE_DES_CBC_CRC;
keyblock.length = sizeof(testkey);
keyblock.contents = testkey;
krb5_k_create_key(NULL, &keyblock, &key);
for (msgindex = 1; msgindex + 1 < argc; msgindex += 2) {
plaintext.length = strlen(argv[msgindex]);
plaintext.data = argv[msgindex];
/* Create a checksum. */
kret = krb5_k_make_checksum(NULL, CKTYPE, key, 0, &plaintext,
&checksum);
if (kret != 0) {
printf("krb5_calculate_checksum choked with %d\n", kret);
break;
}
print_checksum("correct", MD, argv[msgindex], &checksum);
/* Verify it. */
kret = krb5_k_verify_checksum(NULL, key, 0, &plaintext, &checksum,
&valid);
if (kret != 0) {
printf("verify on new checksum choked with %d\n", kret);
break;
}
if (!valid) {
printf("verify on new checksum failed\n");
kret = 1;
break;
}
printf("Verify succeeded for \"%s\"\n", argv[msgindex]);
/* Corrupt the checksum and see if it still verifies. */
checksum.contents[0]++;
kret = krb5_k_verify_checksum(NULL, key, 0, &plaintext, &checksum,
&valid);
if (kret != 0) {
printf("verify on new checksum choked with %d\n", kret);
break;
}
if (valid) {
printf("verify on new checksum succeeded, but shouldn't have\n");
kret = 1;
break;
}
printf("Verify of bad checksum OK for \"%s\"\n", argv[msgindex]);
free(checksum.contents);
/* Verify a known-good checksum for this plaintext. */
parse_hexstring(argv[msgindex+1], &knowncksum);
if (knowncksum.contents == NULL) {
printf("parse_hexstring failed\n");
kret = 1;
break;
}
kret = krb5_k_verify_checksum(NULL, key, 0, &plaintext, &knowncksum,
&valid);
if (kret != 0) {
printf("verify on known checksum choked with %d\n", kret);
break;
}
if (!valid) {
printf("verify on known checksum failed\n");
kret = 1;
break;
}
printf("Verify on known checksum succeeded\n");
free(knowncksum.contents);
}
if (!kret)
printf("%d tests passed successfully for MD%d checksum\n", (argc-1)/2, MD);
krb5_k_free_key(NULL, key);
return(kret);
}
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