-/* crypto/des/cfb_enc.c */
-/* Copyright (C) 1995-1998 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 "e_os.h"
#include "des_locl.h"
+#include <assert.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 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.
*/
-void des_cfb_encrypt(in, out, numbits, length, schedule, ivec, enc)
-unsigned char *in;
-unsigned char *out;
-int numbits;
-long length;
-des_key_schedule schedule;
-des_cblock (*ivec);
-int enc;
- {
- register DES_LONG d0,d1,v0,v1,n=(numbits+7)/8;
- register DES_LONG mask0,mask1;
- register unsigned long l=length;
- register int num=numbits;
- DES_LONG ti[2];
- unsigned char *iv;
+/*
+ * Until Aug 1 2003 this function did not correctly implement CFB-r, so it
+ * will not be compatible with any encryption prior to that date. Ben.
+ */
+void DES_cfb_encrypt(const unsigned char *in, unsigned char *out, int numbits,
+ long length, DES_key_schedule *schedule,
+ DES_cblock *ivec, int enc)
+{
+ register DES_LONG d0, d1, v0, v1;
+ register unsigned long l = length;
+ register int num = numbits / 8, n = (numbits + 7) / 8, i, rem =
+ numbits % 8;
+ DES_LONG ti[2];
+ unsigned char *iv;
+#ifndef L_ENDIAN
+ unsigned char ovec[16];
+#else
+ unsigned int sh[4];
+ unsigned char *ovec = (unsigned char *)sh;
- 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;
- }
+ /* I kind of count that compiler optimizes away this assertion, */
+ assert(sizeof(sh[0]) == 4); /* as this holds true for all, */
+ /* but 16-bit platforms... */
- iv=(unsigned char *)ivec;
- c2l(iv,v0);
- c2l(iv,v1);
- if (enc)
- {
- while (l >= n)
- {
- l-=n;
- ti[0]=v0;
- ti[1]=v1;
- 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;
- /* 30-08-94 - eay - changed because l>>32 and
- * l<<32 are bad under gcc :-( */
- if (num == 32)
- { v0=v1; v1=d0; }
- else if (num == 64)
- { v0=d0; v1=d1; }
- else if (num > 32) /* && num != 64 */
- {
- v0=((v1>>(num-32))|(d0<<(64-num)))&0xffffffffL;
- v1=((d0>>(num-32))|(d1<<(64-num)))&0xffffffffL;
- }
- else /* num < 32 */
- {
- v0=((v0>>num)|(v1<<(32-num)))&0xffffffffL;
- v1=((v1>>num)|(d0<<(32-num)))&0xffffffffL;
- }
- }
- }
- else
- {
- while (l >= n)
- {
- l-=n;
- ti[0]=v0;
- ti[1]=v1;
- des_encrypt((DES_LONG *)ti,schedule,DES_ENCRYPT);
- c2ln(in,d0,d1,n);
- in+=n;
- /* 30-08-94 - eay - changed because l>>32 and
- * l<<32 are bad under gcc :-( */
- if (num == 32)
- { v0=v1; v1=d0; }
- else if (num == 64)
- { v0=d0; v1=d1; }
- else if (num > 32) /* && num != 64 */
- {
- v0=((v1>>(num-32))|(d0<<(64-num)))&0xffffffffL;
- v1=((d0>>(num-32))|(d1<<(64-num)))&0xffffffffL;
- }
- else /* num < 32 */
- {
- v0=((v0>>num)|(v1<<(32-num)))&0xffffffffL;
- v1=((v1>>num)|(d0<<(32-num)))&0xffffffffL;
- }
- d0=(d0^ti[0])&mask0;
- d1=(d1^ti[1])&mask1;
- l2cn(d0,d1,out,n);
- out+=n;
- }
- }
- iv=(unsigned char *)ivec;
- l2c(v0,iv);
- l2c(v1,iv);
- v0=v1=d0=d1=ti[0]=ti[1]=0;
- }
+#endif
+ if (numbits <= 0 || numbits > 64)
+ return;
+ iv = &(*ivec)[0];
+ c2l(iv, v0);
+ c2l(iv, v1);
+ if (enc) {
+ while (l >= (unsigned long)n) {
+ l -= n;
+ ti[0] = v0;
+ ti[1] = v1;
+ DES_encrypt1((DES_LONG *)ti, schedule, DES_ENCRYPT);
+ c2ln(in, d0, d1, n);
+ in += n;
+ d0 ^= ti[0];
+ d1 ^= ti[1];
+ l2cn(d0, d1, out, n);
+ out += n;
+ /*
+ * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
+ * gcc :-(
+ */
+ if (numbits == 32) {
+ v0 = v1;
+ v1 = d0;
+ } else if (numbits == 64) {
+ v0 = d0;
+ v1 = d1;
+ } else {
+#ifndef L_ENDIAN
+ iv = &ovec[0];
+ l2c(v0, iv);
+ l2c(v1, iv);
+ l2c(d0, iv);
+ l2c(d1, iv);
+#else
+ sh[0] = v0, sh[1] = v1, sh[2] = d0, sh[3] = d1;
+#endif
+ if (rem == 0)
+ memmove(ovec, ovec + num, 8);
+ else
+ for (i = 0; i < 8; ++i)
+ ovec[i] = ovec[i + num] << rem |
+ ovec[i + num + 1] >> (8 - rem);
+#ifdef L_ENDIAN
+ v0 = sh[0], v1 = sh[1];
+#else
+ iv = &ovec[0];
+ c2l(iv, v0);
+ c2l(iv, v1);
+#endif
+ }
+ }
+ } else {
+ while (l >= (unsigned long)n) {
+ l -= n;
+ ti[0] = v0;
+ ti[1] = v1;
+ DES_encrypt1((DES_LONG *)ti, schedule, DES_ENCRYPT);
+ c2ln(in, d0, d1, n);
+ in += n;
+ /*
+ * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
+ * gcc :-(
+ */
+ if (numbits == 32) {
+ v0 = v1;
+ v1 = d0;
+ } else if (numbits == 64) {
+ v0 = d0;
+ v1 = d1;
+ } else {
+#ifndef L_ENDIAN
+ iv = &ovec[0];
+ l2c(v0, iv);
+ l2c(v1, iv);
+ l2c(d0, iv);
+ l2c(d1, iv);
+#else
+ sh[0] = v0, sh[1] = v1, sh[2] = d0, sh[3] = d1;
+#endif
+ if (rem == 0)
+ memmove(ovec, ovec + num, 8);
+ else
+ for (i = 0; i < 8; ++i)
+ ovec[i] = ovec[i + num] << rem |
+ ovec[i + num + 1] >> (8 - rem);
+#ifdef L_ENDIAN
+ v0 = sh[0], v1 = sh[1];
+#else
+ iv = &ovec[0];
+ c2l(iv, v0);
+ c2l(iv, v1);
+#endif
+ }
+ d0 ^= ti[0];
+ d1 ^= ti[1];
+ l2cn(d0, d1, out, n);
+ out += n;
+ }
+ }
+ iv = &(*ivec)[0];
+ l2c(v0, iv);
+ l2c(v1, iv);
+ v0 = v1 = d0 = d1 = ti[0] = ti[1] = 0;
+}
projects / openssl.git / blobdiff