X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fdes%2Fofb_enc.c;h=65a9b8604d8032777586a9529c56336f4960dbb5;hp=4db0cdbd600c80e8e78bd0fb5543db6c27570d78;hb=efb8128ad56924736f50c01cde94b1716560aec7;hpb=78414a6a897db42c9bcf06aa21c705811ab33921 diff --git a/crypto/des/ofb_enc.c b/crypto/des/ofb_enc.c index 4db0cdbd60..65a9b8604d 100644 --- a/crypto/des/ofb_enc.c +++ b/crypto/des/ofb_enc.c @@ -1,139 +1,82 @@ -/* crypto/des/ofb_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 "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,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; +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< 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) - { - ti[0]=v0; - ti[1]=v1; - des_encrypt((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; + 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=(unsigned char *)ivec; - l2c(v0,iv); - l2c(v1,iv); - v0=v1=d0=d1=ti[0]=ti[1]=vv0=vv1=0; - } + 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; +}