-/* crypto/des/ofb_enc.c */
-/* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
+/*
+ * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
+ * 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_locl.h"
-/* The input and output are loaded in multiples of 8 bits.
- * What this means is that if you hame numbits=12 and length=2
- * the first 12 bits will be retrieved from the first byte and half
- * the second. The second 12 bits will come from the 3rd and half the 4th
- * byte.
+/*
+ * The input and output are loaded in multiples of 8 bits. What this means is
+ * that if you have numbits=12 and length=2 the first 12 bits will be
+ * retrieved from the first byte and half the second. The second 12 bits
+ * will come from the 3rd and half the 4th byte.
*/
-void des_ofb_encrypt(in, out, numbits, length, schedule, ivec)
-unsigned char *in;
-unsigned char *out;
-int numbits;
-long length;
-des_key_schedule schedule;
-des_cblock (*ivec);
- {
- register DES_LONG d0,d1,v0,v1,n=(numbits+7)/8;
- register DES_LONG mask0,mask1;
- register long l=length;
- register int num=numbits;
- DES_LONG ti[2];
- unsigned char *iv;
+void DES_ofb_encrypt(const unsigned char *in, unsigned char *out, int numbits,
+ long length, DES_key_schedule *schedule,
+ DES_cblock *ivec)
+{
+ register DES_LONG d0, d1, vv0, vv1, v0, v1, n = (numbits + 7) / 8;
+ register DES_LONG mask0, mask1;
+ register long l = length;
+ register int num = numbits;
+ DES_LONG ti[2];
+ unsigned char *iv;
- if (num > 64) return;
- if (num > 32)
- {
- mask0=0xffffffffL;
- if (num >= 64)
- mask1=mask0;
- else
- mask1=(1L<<(num-32))-1;
- }
- else
- {
- if (num == 32)
- mask0=0xffffffffL;
- else
- mask0=(1L<<num)-1;
- mask1=0x00000000;
- }
+ if (num > 64)
+ return;
+ if (num > 32) {
+ mask0 = 0xffffffffL;
+ if (num >= 64)
+ mask1 = mask0;
+ else
+ mask1 = (1L << (num - 32)) - 1;
+ } else {
+ if (num == 32)
+ mask0 = 0xffffffffL;
+ else
+ mask0 = (1L << num) - 1;
+ mask1 = 0x00000000L;
+ }
- iv=(unsigned char *)ivec;
- c2l(iv,v0);
- c2l(iv,v1);
- ti[0]=v0;
- ti[1]=v1;
- while (l-- > 0)
- {
- des_encrypt((DES_LONG *)ti,schedule,DES_ENCRYPT);
- c2ln(in,d0,d1,n);
- in+=n;
- d0=(d0^ti[0])&mask0;
- d1=(d1^ti[1])&mask1;
- l2cn(d0,d1,out,n);
- out+=n;
- }
- v0=ti[0];
- v1=ti[1];
- iv=(unsigned char *)ivec;
- l2c(v0,iv);
- l2c(v1,iv);
- v0=v1=d0=d1=ti[0]=ti[1]=0;
- }
+ iv = &(*ivec)[0];
+ c2l(iv, v0);
+ c2l(iv, v1);
+ ti[0] = v0;
+ ti[1] = v1;
+ while (l-- > 0) {
+ ti[0] = v0;
+ ti[1] = v1;
+ DES_encrypt1((DES_LONG *)ti, schedule, DES_ENCRYPT);
+ vv0 = ti[0];
+ vv1 = ti[1];
+ c2ln(in, d0, d1, n);
+ in += n;
+ d0 = (d0 ^ vv0) & mask0;
+ d1 = (d1 ^ vv1) & mask1;
+ l2cn(d0, d1, out, n);
+ out += n;
+ if (num == 32) {
+ v0 = v1;
+ v1 = vv0;
+ } else if (num == 64) {
+ v0 = vv0;
+ v1 = vv1;
+ } else if (num > 32) { /* && num != 64 */
+ v0 = ((v1 >> (num - 32)) | (vv0 << (64 - num))) & 0xffffffffL;
+ v1 = ((vv0 >> (num - 32)) | (vv1 << (64 - num))) & 0xffffffffL;
+ } else { /* num < 32 */
+
+ v0 = ((v0 >> num) | (v1 << (32 - num))) & 0xffffffffL;
+ v1 = ((v1 >> num) | (vv0 << (32 - num))) & 0xffffffffL;
+ }
+ }
+ iv = &(*ivec)[0];
+ l2c(v0, iv);
+ l2c(v1, iv);
+ v0 = v1 = d0 = d1 = ti[0] = ti[1] = vv0 = vv1 = 0;
+}
projects / openssl.git / blobdiff