mirror of
https://github.com/openssl/openssl.git
synced 2024-11-28 04:25:31 +08:00
33388b44b6
Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/11616)
80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
/*
|
|
* Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
|
|
*
|
|
* Licensed under the Apache License 2.0 (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
|
|
*/
|
|
|
|
/*
|
|
* DES low level APIs are deprecated for public use, but still ok for internal
|
|
* use.
|
|
*/
|
|
#include "internal/deprecated.h"
|
|
|
|
#include "des_local.h"
|
|
|
|
/*
|
|
* The input and output encrypted as though 64bit cfb mode is being used.
|
|
* The extra state information to record how much of the 64bit block we have
|
|
* used is contained in *num;
|
|
*/
|
|
|
|
void DES_cfb64_encrypt(const unsigned char *in, unsigned char *out,
|
|
long length, DES_key_schedule *schedule,
|
|
DES_cblock *ivec, int *num, int enc)
|
|
{
|
|
register DES_LONG v0, v1;
|
|
register long l = length;
|
|
register int n = *num;
|
|
DES_LONG ti[2];
|
|
unsigned char *iv, c, cc;
|
|
|
|
iv = &(*ivec)[0];
|
|
if (enc) {
|
|
while (l--) {
|
|
if (n == 0) {
|
|
c2l(iv, v0);
|
|
ti[0] = v0;
|
|
c2l(iv, v1);
|
|
ti[1] = v1;
|
|
DES_encrypt1(ti, schedule, DES_ENCRYPT);
|
|
iv = &(*ivec)[0];
|
|
v0 = ti[0];
|
|
l2c(v0, iv);
|
|
v0 = ti[1];
|
|
l2c(v0, iv);
|
|
iv = &(*ivec)[0];
|
|
}
|
|
c = *(in++) ^ iv[n];
|
|
*(out++) = c;
|
|
iv[n] = c;
|
|
n = (n + 1) & 0x07;
|
|
}
|
|
} else {
|
|
while (l--) {
|
|
if (n == 0) {
|
|
c2l(iv, v0);
|
|
ti[0] = v0;
|
|
c2l(iv, v1);
|
|
ti[1] = v1;
|
|
DES_encrypt1(ti, schedule, DES_ENCRYPT);
|
|
iv = &(*ivec)[0];
|
|
v0 = ti[0];
|
|
l2c(v0, iv);
|
|
v0 = ti[1];
|
|
l2c(v0, iv);
|
|
iv = &(*ivec)[0];
|
|
}
|
|
cc = *(in++);
|
|
c = iv[n];
|
|
iv[n] = cc;
|
|
*(out++) = c ^ cc;
|
|
n = (n + 1) & 0x07;
|
|
}
|
|
}
|
|
v0 = v1 = ti[0] = ti[1] = c = cc = 0;
|
|
*num = n;
|
|
}
|