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250 lines
8.6 KiB
250 lines
8.6 KiB
4 years ago
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/* crypto/des/cfb64ede.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include "des_locl.h"
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#include "e_os.h"
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/*
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* The input and output encrypted as though 64bit cfb mode is being used.
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* The extra state information to record how much of the 64bit block we have
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* used is contained in *num;
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*/
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void DES_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out,
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long length, DES_key_schedule *ks1,
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DES_key_schedule *ks2, DES_key_schedule *ks3,
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DES_cblock *ivec, int *num, int enc)
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{
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register DES_LONG v0, v1;
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register long l = length;
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register int n = *num;
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DES_LONG ti[2];
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unsigned char *iv, c, cc;
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iv = &(*ivec)[0];
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if (enc) {
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while (l--) {
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if (n == 0) {
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c2l(iv, v0);
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c2l(iv, v1);
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ti[0] = v0;
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ti[1] = v1;
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DES_encrypt3(ti, ks1, ks2, ks3);
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v0 = ti[0];
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v1 = ti[1];
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iv = &(*ivec)[0];
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l2c(v0, iv);
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l2c(v1, iv);
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iv = &(*ivec)[0];
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}
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c = *(in++) ^ iv[n];
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*(out++) = c;
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iv[n] = c;
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n = (n + 1) & 0x07;
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}
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} else {
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while (l--) {
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if (n == 0) {
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c2l(iv, v0);
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c2l(iv, v1);
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ti[0] = v0;
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ti[1] = v1;
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DES_encrypt3(ti, ks1, ks2, ks3);
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v0 = ti[0];
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v1 = ti[1];
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iv = &(*ivec)[0];
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l2c(v0, iv);
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l2c(v1, iv);
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iv = &(*ivec)[0];
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}
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cc = *(in++);
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c = iv[n];
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iv[n] = cc;
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*(out++) = c ^ cc;
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n = (n + 1) & 0x07;
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}
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}
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v0 = v1 = ti[0] = ti[1] = c = cc = 0;
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*num = n;
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}
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#ifdef undef /* MACRO */
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void DES_ede2_cfb64_encrypt(unsigned char *in, unsigned char *out,
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long length, DES_key_schedule ks1,
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DES_key_schedule ks2, DES_cblock (*ivec),
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int *num, int enc)
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{
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DES_ede3_cfb64_encrypt(in, out, length, ks1, ks2, ks1, ivec, num, enc);
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}
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#endif
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/*
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* This is compatible with the single key CFB-r for DES, even thought that's
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* not what EVP needs.
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*/
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void DES_ede3_cfb_encrypt(const unsigned char *in, unsigned char *out,
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int numbits, long length, DES_key_schedule *ks1,
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DES_key_schedule *ks2, DES_key_schedule *ks3,
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DES_cblock *ivec, int enc)
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{
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register DES_LONG d0, d1, v0, v1;
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register unsigned long l = length, n = ((unsigned int)numbits + 7) / 8;
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register int num = numbits, i;
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DES_LONG ti[2];
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unsigned char *iv;
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unsigned char ovec[16];
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if (num > 64)
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return;
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iv = &(*ivec)[0];
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c2l(iv, v0);
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c2l(iv, v1);
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if (enc) {
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while (l >= n) {
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l -= n;
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ti[0] = v0;
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ti[1] = v1;
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DES_encrypt3(ti, ks1, ks2, ks3);
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c2ln(in, d0, d1, n);
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in += n;
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d0 ^= ti[0];
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d1 ^= ti[1];
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l2cn(d0, d1, out, n);
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out += n;
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/*
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* 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
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* gcc :-(
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*/
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if (num == 32) {
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v0 = v1;
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v1 = d0;
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} else if (num == 64) {
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v0 = d0;
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v1 = d1;
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} else {
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iv = &ovec[0];
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l2c(v0, iv);
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l2c(v1, iv);
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l2c(d0, iv);
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l2c(d1, iv);
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/* shift ovec left most of the bits... */
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memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0));
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/* now the remaining bits */
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if (num % 8 != 0)
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for (i = 0; i < 8; ++i) {
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ovec[i] <<= num % 8;
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ovec[i] |= ovec[i + 1] >> (8 - num % 8);
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}
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iv = &ovec[0];
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c2l(iv, v0);
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c2l(iv, v1);
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}
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}
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} else {
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while (l >= n) {
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l -= n;
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ti[0] = v0;
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ti[1] = v1;
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DES_encrypt3(ti, ks1, ks2, ks3);
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c2ln(in, d0, d1, n);
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in += n;
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/*
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* 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
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* gcc :-(
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*/
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if (num == 32) {
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v0 = v1;
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v1 = d0;
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} else if (num == 64) {
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v0 = d0;
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v1 = d1;
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} else {
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iv = &ovec[0];
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l2c(v0, iv);
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l2c(v1, iv);
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l2c(d0, iv);
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l2c(d1, iv);
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/* shift ovec left most of the bits... */
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memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0));
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/* now the remaining bits */
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if (num % 8 != 0)
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for (i = 0; i < 8; ++i) {
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ovec[i] <<= num % 8;
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ovec[i] |= ovec[i + 1] >> (8 - num % 8);
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}
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iv = &ovec[0];
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c2l(iv, v0);
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c2l(iv, v1);
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}
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d0 ^= ti[0];
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d1 ^= ti[1];
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l2cn(d0, d1, out, n);
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out += n;
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}
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}
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iv = &(*ivec)[0];
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l2c(v0, iv);
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l2c(v1, iv);
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v0 = v1 = d0 = d1 = ti[0] = ti[1] = 0;
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}
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