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| /*
| * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
| *
| * Licensed under the OpenSSL license (the "License"). You may not use
| * this file except in compliance with the License. You can obtain a copy
| * in the file LICENSE in the source distribution or at
| * https://www.openssl.org/source/license.html
| */
|
| #include "des_local.h"
|
| void DES_pcbc_encrypt(const unsigned char *input, unsigned char *output,
| long length, DES_key_schedule *schedule,
| DES_cblock *ivec, int enc)
| {
| register DES_LONG sin0, sin1, xor0, xor1, tout0, tout1;
| DES_LONG tin[2];
| const unsigned char *in;
| unsigned char *out, *iv;
|
| in = input;
| out = output;
| iv = &(*ivec)[0];
|
| if (enc) {
| c2l(iv, xor0);
| c2l(iv, xor1);
| for (; length > 0; length -= 8) {
| if (length >= 8) {
| c2l(in, sin0);
| c2l(in, sin1);
| } else
| c2ln(in, sin0, sin1, length);
| tin[0] = sin0 ^ xor0;
| tin[1] = sin1 ^ xor1;
| DES_encrypt1((DES_LONG *)tin, schedule, DES_ENCRYPT);
| tout0 = tin[0];
| tout1 = tin[1];
| xor0 = sin0 ^ tout0;
| xor1 = sin1 ^ tout1;
| l2c(tout0, out);
| l2c(tout1, out);
| }
| } else {
| c2l(iv, xor0);
| c2l(iv, xor1);
| for (; length > 0; length -= 8) {
| c2l(in, sin0);
| c2l(in, sin1);
| tin[0] = sin0;
| tin[1] = sin1;
| DES_encrypt1((DES_LONG *)tin, schedule, DES_DECRYPT);
| tout0 = tin[0] ^ xor0;
| tout1 = tin[1] ^ xor1;
| if (length >= 8) {
| l2c(tout0, out);
| l2c(tout1, out);
| } else
| l2cn(tout0, tout1, out, length);
| xor0 = tout0 ^ sin0;
| xor1 = tout1 ^ sin1;
| }
| }
| tin[0] = tin[1] = 0;
| sin0 = sin1 = xor0 = xor1 = tout0 = tout1 = 0;
| }
|
|
