#include "k5-int.h"
#include "des_int.h"
#include "enc_provider.h"
static krb5_error_code
k5_des_docrypt(const krb5_keyblock *key, const krb5_data *ivec,
const krb5_data *input, krb5_data *output, int enc)
{
mit_des_key_schedule schedule;
if (key->length != 8)
return(KRB5_BAD_KEYSIZE);
if ((input->length%8) != 0)
return(KRB5_BAD_MSIZE);
if (ivec && (ivec->length != 8))
return(KRB5_BAD_MSIZE);
if (input->length != output->length)
return(KRB5_BAD_MSIZE);
switch (mit_des_key_sched(key->contents, schedule)) {
case -1:
return(KRB5DES_BAD_KEYPAR);
case -2:
return(KRB5DES_WEAK_KEY);
}
mit_des_cbc_encrypt((krb5_pointer) input->data,
(krb5_pointer) output->data, input->length,
schedule,
(ivec
? (unsigned char *) ivec->data
: (unsigned char *) mit_des_zeroblock),
enc);
memset(schedule, 0, sizeof(schedule));
return(0);
}
static krb5_error_code
k5_des_encrypt(const krb5_keyblock *key, const krb5_data *ivec,
const krb5_data *input, krb5_data *output)
{
return(k5_des_docrypt(key, ivec, input, output, 1));
}
static krb5_error_code
k5_des_decrypt(const krb5_keyblock *key, const krb5_data *ivec,
const krb5_data *input, krb5_data *output)
{
return(k5_des_docrypt(key, ivec, input, output, 0));
}
static krb5_error_code
k5_des_make_key(const krb5_data *randombits, krb5_keyblock *key)
{
if (key->length != 8)
return(KRB5_BAD_KEYSIZE);
if (randombits->length != 7)
return(KRB5_CRYPTO_INTERNAL);
key->magic = KV5M_KEYBLOCK;
key->length = 8;
memcpy(key->contents, randombits->data, randombits->length);
key->contents[7] = (((key->contents[0]&1)<<1) | ((key->contents[1]&1)<<2) |
((key->contents[2]&1)<<3) | ((key->contents[3]&1)<<4) |
((key->contents[4]&1)<<5) | ((key->contents[5]&1)<<6) |
((key->contents[6]&1)<<7));
mit_des_fixup_key_parity(key->contents);
return(0);
}
const struct krb5_enc_provider krb5int_enc_des = {
8,
7, 8,
k5_des_encrypt,
k5_des_decrypt,
k5_des_make_key,
krb5int_des_init_state,
krb5int_default_free_state
};