mirror of
https://github.com/ossrs/srs.git
synced 2025-03-09 15:49:59 +00:00
66 lines
2 KiB
C
66 lines
2 KiB
C
/*
|
|
* 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;
|
|
}
|