#include "k5-int.h"
#include "old.h"
void
krb5_old_encrypt_length(const struct krb5_enc_provider *enc,
const struct krb5_hash_provider *hash,
size_t inputlen,
size_t *length)
{
size_t blocksize, hashsize;
blocksize = enc->block_size;
hashsize = hash->hashsize;
*length = krb5_roundup(blocksize+hashsize+inputlen, blocksize);
}
krb5_error_code
krb5_old_encrypt(const struct krb5_enc_provider *enc,
const struct krb5_hash_provider *hash,
const krb5_keyblock *key,
krb5_keyusage usage,
const krb5_data *ivec,
const krb5_data *input,
krb5_data *output)
{
krb5_error_code ret;
size_t blocksize, hashsize, enclen;
krb5_data datain, crcivec;
int real_ivec;
blocksize = enc->block_size;
hashsize = hash->hashsize;
krb5_old_encrypt_length(enc, hash, input->length, &enclen);
if (output->length < enclen)
return(KRB5_BAD_MSIZE);
output->length = enclen;
memset(output->data, 0, output->length);
datain.length = blocksize;
datain.data = output->data;
if ((ret = krb5_c_random_make_octets( 0, &datain)))
return(ret);
memcpy(output->data+blocksize+hashsize, input->data, input->length);
datain.length = hashsize;
datain.data = output->data+blocksize;
if ((ret = ((*(hash->hash))(1, output, &datain))))
goto cleanup;
if ((key->enctype == ENCTYPE_DES_CBC_CRC) && (ivec == 0)) {
crcivec.length = key->length;
crcivec.data = (char *) key->contents;
ivec = &crcivec;
real_ivec = 0;
} else
real_ivec = 1;
if ((ret = ((*(enc->encrypt))(key, ivec, output, output))))
goto cleanup;
if (real_ivec && ivec != NULL && ivec->length == blocksize)
memcpy(ivec->data, output->data + output->length - blocksize,
blocksize);
cleanup:
if (ret)
memset(output->data, 0, output->length);
return(ret);
}