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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* Copyright (C) 2008 by the Massachusetts Institute of Technology.
* Copyright 1995 by Richard P. Basch. All Rights Reserved.
* Copyright 1995 by Lehman Brothers, Inc. 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 Richard P. Basch, Lehman Brothers and M.I.T. not be used
* in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. Richard P. Basch,
* Lehman Brothers and M.I.T. make no representations about the suitability
* of this software for any purpose. It is provided "as is" without
* express or implied warranty.
*/
#include "des_int.h"
#include "f_tables.h"
#include "aead.h"
const mit_des_cblock mit_des_zeroblock /* = all zero */;
void
krb5int_des_cbc_encrypt(krb5_crypto_iov *data, unsigned long num_data,
const mit_des_key_schedule schedule,
mit_des_cblock ivec)
{
unsigned DES_INT32 left, right;
const unsigned DES_INT32 *kp;
const unsigned char *ip;
struct iov_block_state input_pos, output_pos;
unsigned char storage[MIT_DES_BLOCK_LENGTH], *block = NULL, *ptr;
IOV_BLOCK_STATE_INIT(&input_pos);
IOV_BLOCK_STATE_INIT(&output_pos);
/* Get key pointer here. This won't need to be reinitialized. */
kp = (const unsigned DES_INT32 *)schedule;
/* Initialize left and right with the contents of the initial vector. */
ip = (ivec != NULL) ? ivec : mit_des_zeroblock;
GET_HALF_BLOCK(left, ip);
GET_HALF_BLOCK(right, ip);
/* Work the length down 8 bytes at a time. */
for (;;) {
unsigned DES_INT32 temp;
ptr = iov_next_block(storage, MIT_DES_BLOCK_LENGTH, data, num_data,
&input_pos);
if (ptr == NULL)
break;
block = ptr;
/* Decompose this block and xor it with the previous ciphertext. */
GET_HALF_BLOCK(temp, ptr);
left ^= temp;
GET_HALF_BLOCK(temp, ptr);
right ^= temp;
/* Encrypt what we have and store back into block. */
DES_DO_ENCRYPT(left, right, kp);
ptr = block;
PUT_HALF_BLOCK(left, ptr);
PUT_HALF_BLOCK(right, ptr);
iov_store_block(data, num_data, block, storage, MIT_DES_BLOCK_LENGTH,
&output_pos);
}
if (ivec != NULL && block != NULL) {
ptr = ivec;
PUT_HALF_BLOCK(left, ptr);
PUT_HALF_BLOCK(right, ptr);
}
}
void
krb5int_des_cbc_decrypt(krb5_crypto_iov *data, unsigned long num_data,
const mit_des_key_schedule schedule,
mit_des_cblock ivec)
{
unsigned DES_INT32 left, right;
const unsigned DES_INT32 *kp;
const unsigned char *ip;
unsigned DES_INT32 ocipherl, ocipherr;
unsigned DES_INT32 cipherl, cipherr;
struct iov_block_state input_pos, output_pos;
unsigned char storage[MIT_DES_BLOCK_LENGTH], *block = NULL, *ptr;
IOV_BLOCK_STATE_INIT(&input_pos);
IOV_BLOCK_STATE_INIT(&output_pos);
/* Get key pointer here. This won't need to be reinitialized. */
kp = (const unsigned DES_INT32 *)schedule;
/*
* Decrypting is harder than encrypting because of
* the necessity of remembering a lot more things.
* Should think about this a little more...
*/
/* Prime the old cipher with ivec. */
ip = (ivec != NULL) ? ivec : mit_des_zeroblock;
GET_HALF_BLOCK(ocipherl, ip);
GET_HALF_BLOCK(ocipherr, ip);
/* Work the length down 8 bytes at a time. */
for (;;) {
ptr = iov_next_block(storage, MIT_DES_BLOCK_LENGTH, data, num_data,
&input_pos);
if (ptr == NULL)
break;
block = ptr;
/* Split this block into left and right. */
GET_HALF_BLOCK(left, ptr);
GET_HALF_BLOCK(right, ptr);
cipherl = left;
cipherr = right;
/* Decrypt and xor with the old cipher to get plain text. */
DES_DO_DECRYPT(left, right, kp);
left ^= ocipherl;
right ^= ocipherr;
/* Store the encrypted halves back into block. */
ptr = block;
PUT_HALF_BLOCK(left, ptr);
PUT_HALF_BLOCK(right, ptr);
/* Save current cipher block halves. */
ocipherl = cipherl;
ocipherr = cipherr;
iov_store_block(data, num_data, block, storage, MIT_DES_BLOCK_LENGTH,
&output_pos);
}
if (ivec != NULL && block != NULL) {
ptr = ivec;
PUT_HALF_BLOCK(ocipherl, ptr);
PUT_HALF_BLOCK(ocipherr, ptr);
}
}
void
krb5int_des_cbc_mac(const krb5_crypto_iov *data, unsigned long num_data,
const mit_des_key_schedule schedule, mit_des_cblock ivec,
mit_des_cblock out)
{
unsigned DES_INT32 left, right;
const unsigned DES_INT32 *kp;
const unsigned char *ip;
struct iov_block_state input_pos;
unsigned char storage[MIT_DES_BLOCK_LENGTH], *block = NULL, *ptr;
IOV_BLOCK_STATE_INIT(&input_pos);
input_pos.include_sign_only = 1;
/* Get key pointer here. This won't need to be reinitialized. */
kp = (const unsigned DES_INT32 *)schedule;
/* Initialize left and right with the contents of the initial vector. */
ip = (ivec != NULL) ? ivec : mit_des_zeroblock;
GET_HALF_BLOCK(left, ip);
GET_HALF_BLOCK(right, ip);
/* Work the length down 8 bytes at a time. */
for (;;) {
unsigned DES_INT32 temp;
ptr = iov_next_block(storage, MIT_DES_BLOCK_LENGTH, data, num_data,
&input_pos);
if (ptr == NULL)
break;
block = ptr;
/* Decompose this block and xor it with the previous ciphertext. */
GET_HALF_BLOCK(temp, ptr);
left ^= temp;
GET_HALF_BLOCK(temp, ptr);
right ^= temp;
/* Encrypt what we have. */
DES_DO_ENCRYPT(left, right, kp);
}
/* Output the final ciphertext block. */
ptr = out;
PUT_HALF_BLOCK(left, ptr);
PUT_HALF_BLOCK(right, ptr);
}
#if defined(CONFIG_SMALL) && !defined(CONFIG_SMALL_NO_CRYPTO)
void krb5int_des_do_encrypt_2 (unsigned DES_INT32 *left,
unsigned DES_INT32 *right,
const unsigned DES_INT32 *kp)
{
DES_DO_ENCRYPT_1 (*left, *right, kp);
}
void krb5int_des_do_decrypt_2 (unsigned DES_INT32 *left,
unsigned DES_INT32 *right,
const unsigned DES_INT32 *kp)
{
DES_DO_DECRYPT_1 (*left, *right, kp);
}
#endif
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