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- /*
- * 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 ofb 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_ofb64_encrypt(register const unsigned char *in,
- register unsigned char *out, long length,
- DES_key_schedule *schedule, DES_cblock *ivec, int *num)
- {
- register DES_LONG v0, v1, t;
- register int n = *num;
- register long l = length;
- DES_cblock d;
- register unsigned char *dp;
- DES_LONG ti[2];
- unsigned char *iv;
- int save = 0;
- iv = &(*ivec)[0];
- c2l(iv, v0);
- c2l(iv, v1);
- ti[0] = v0;
- ti[1] = v1;
- dp = d;
- l2c(v0, dp);
- l2c(v1, dp);
- while (l--) {
- if (n == 0) {
- DES_encrypt1(ti, schedule, DES_ENCRYPT);
- dp = d;
- t = ti[0];
- l2c(t, dp);
- t = ti[1];
- l2c(t, dp);
- save++;
- }
- *(out++) = *(in++) ^ d[n];
- n = (n + 1) & 0x07;
- }
- if (save) {
- v0 = ti[0];
- v1 = ti[1];
- iv = &(*ivec)[0];
- l2c(v0, iv);
- l2c(v1, iv);
- }
- t = v0 = v1 = ti[0] = ti[1] = 0;
- *num = n;
- }
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