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/*
* $Source$
* $Author$
*
* Copyright 1991 by the Massachusetts Institute of Technology.
*
* For copying and distribution information, please see the file
* <krb5/copyright.h>.
*
* Kerberos glue for MD4 sample implementation.
*/
#if !defined(lint) && !defined(SABER)
static char rcsid_md4crypto_c[] =
"$Id$";
#endif /* !lint & !SABER */
#include <krb5/copyright.h>
#include <krb5/krb5.h>
#include <krb5/rsa-md4.h>
#include "../des/des_int.h" /* we cheat a bit and call it directly... */
static krb5_error_code
md4_crypto_sum_func(in, in_length, seed, seed_length, outcksum)
krb5_pointer in;
size_t in_length;
krb5_pointer seed;
size_t seed_length;
krb5_checksum *outcksum;
{
krb5_octet *output, outtmp[RSA_MD4_DES_CKSUM_LENGTH];
krb5_octet *input = (krb5_octet *)in;
krb5_encrypt_block eblock;
krb5_keyblock keyblock;
krb5_error_code retval;
register int i, j;
MDstruct working;
MDbegin(&working);
for (i = in_length; i >= 64; i -= 64, input += 64)
/* MD4 works in 512 bit chunks (64 bytes) */
MDupdate(&working, input, 512);
/* now close out remaining stuff. Even if i == 0, we want to
"close out" the MD4 algorithm */
MDupdate(&working, input, i*8);
outcksum->checksum_type = CKSUMTYPE_RSA_MD4_DES;
outcksum->length = RSA_MD4_DES_CKSUM_LENGTH;
/* the output code here is adapted from MDprint;
it needs to assemble it into proper byte order. */
output = &outtmp[0];
for (i = 0; i < 4; i++)
for (j = 0; j < 32; j += 8)
*output++ = (working.buffer[i] >> j) & 0xFF;
keyblock.length = seed_length;
keyblock.contents = seed;
keyblock.keytype = KEYTYPE_DES;
if (retval = mit_des_process_key(&eblock, &keyblock))
return retval;
/* now encrypt it */
retval = mit_des_cbc_encrypt(output,
outcksum->contents,
RSA_MD4_DES_CKSUM_LENGTH,
(struct mit_des_ks_struct *)eblock.priv,
keyblock.contents,
MIT_DES_ENCRYPT);
if (retval) {
(void) mit_des_finish_key(&eblock);
return retval;
}
return mit_des_finish_key(&eblock);
}
krb5_checksum_entry md4_crypto_cksumtable_entry = {
md4_crypto_sum_func,
RSA_MD4_CKSUM_LENGTH, /* CRC-32 is 4 octets */
1, /* is collision proof */
1, /* uses key */
};
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