| /* ede_cbcm_enc.c */ |
| /* |
| * Written by Ben Laurie <ben@algroup.co.uk> for the OpenSSL project 13 Feb |
| * 1999. |
| */ |
| /* ==================================================================== |
| * Copyright (c) 1999 The OpenSSL Project. All rights reserved. |
| * |
| * 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 above 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 acknowledgment: |
| * "This product includes software developed by the OpenSSL Project |
| * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
| * |
| * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| * endorse or promote products derived from this software without |
| * prior written permission. For written permission, please contact |
| * licensing@OpenSSL.org. |
| * |
| * 5. Products derived from this software may not be called "OpenSSL" |
| * nor may "OpenSSL" appear in their names without prior written |
| * permission of the OpenSSL Project. |
| * |
| * 6. Redistributions of any form whatsoever must retain the following |
| * acknowledgment: |
| * "This product includes software developed by the OpenSSL Project |
| * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
| * EXPRESSED 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 OpenSSL PROJECT OR |
| * ITS 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. |
| * ==================================================================== |
| * |
| * This product includes cryptographic software written by Eric Young |
| * (eay@cryptsoft.com). This product includes software written by Tim |
| * Hudson (tjh@cryptsoft.com). |
| * |
| */ |
| |
| /* |
| * |
| * This is an implementation of Triple DES Cipher Block Chaining with Output |
| * Feedback Masking, by Coppersmith, Johnson and Matyas, (IBM and Certicom). |
| * |
| * Note that there is a known attack on this by Biham and Knudsen but it |
| * takes a lot of work: |
| * |
| * http://www.cs.technion.ac.il/users/wwwb/cgi-bin/tr-get.cgi/1998/CS/CS0928.ps.gz |
| * |
| */ |
| |
| #include <openssl/opensslconf.h> /* To see if OPENSSL_NO_DESCBCM is defined */ |
| |
| #ifndef OPENSSL_NO_DESCBCM |
| # include "des_locl.h" |
| |
| void DES_ede3_cbcm_encrypt(const unsigned char *in, unsigned char *out, |
| long length, DES_key_schedule *ks1, |
| DES_key_schedule *ks2, DES_key_schedule *ks3, |
| DES_cblock *ivec1, DES_cblock *ivec2, int enc) |
| { |
| register DES_LONG tin0, tin1; |
| register DES_LONG tout0, tout1, xor0, xor1, m0, m1; |
| register long l = length; |
| DES_LONG tin[2]; |
| unsigned char *iv1, *iv2; |
| |
| iv1 = &(*ivec1)[0]; |
| iv2 = &(*ivec2)[0]; |
| |
| if (enc) { |
| c2l(iv1, m0); |
| c2l(iv1, m1); |
| c2l(iv2, tout0); |
| c2l(iv2, tout1); |
| for (l -= 8; l >= -7; l -= 8) { |
| tin[0] = m0; |
| tin[1] = m1; |
| DES_encrypt1(tin, ks3, 1); |
| m0 = tin[0]; |
| m1 = tin[1]; |
| |
| if (l < 0) { |
| c2ln(in, tin0, tin1, l + 8); |
| } else { |
| c2l(in, tin0); |
| c2l(in, tin1); |
| } |
| tin0 ^= tout0; |
| tin1 ^= tout1; |
| |
| tin[0] = tin0; |
| tin[1] = tin1; |
| DES_encrypt1(tin, ks1, 1); |
| tin[0] ^= m0; |
| tin[1] ^= m1; |
| DES_encrypt1(tin, ks2, 0); |
| tin[0] ^= m0; |
| tin[1] ^= m1; |
| DES_encrypt1(tin, ks1, 1); |
| tout0 = tin[0]; |
| tout1 = tin[1]; |
| |
| l2c(tout0, out); |
| l2c(tout1, out); |
| } |
| iv1 = &(*ivec1)[0]; |
| l2c(m0, iv1); |
| l2c(m1, iv1); |
| |
| iv2 = &(*ivec2)[0]; |
| l2c(tout0, iv2); |
| l2c(tout1, iv2); |
| } else { |
| register DES_LONG t0, t1; |
| |
| c2l(iv1, m0); |
| c2l(iv1, m1); |
| c2l(iv2, xor0); |
| c2l(iv2, xor1); |
| for (l -= 8; l >= -7; l -= 8) { |
| tin[0] = m0; |
| tin[1] = m1; |
| DES_encrypt1(tin, ks3, 1); |
| m0 = tin[0]; |
| m1 = tin[1]; |
| |
| c2l(in, tin0); |
| c2l(in, tin1); |
| |
| t0 = tin0; |
| t1 = tin1; |
| |
| tin[0] = tin0; |
| tin[1] = tin1; |
| DES_encrypt1(tin, ks1, 0); |
| tin[0] ^= m0; |
| tin[1] ^= m1; |
| DES_encrypt1(tin, ks2, 1); |
| tin[0] ^= m0; |
| tin[1] ^= m1; |
| DES_encrypt1(tin, ks1, 0); |
| tout0 = tin[0]; |
| tout1 = tin[1]; |
| |
| tout0 ^= xor0; |
| tout1 ^= xor1; |
| if (l < 0) { |
| l2cn(tout0, tout1, out, l + 8); |
| } else { |
| l2c(tout0, out); |
| l2c(tout1, out); |
| } |
| xor0 = t0; |
| xor1 = t1; |
| } |
| |
| iv1 = &(*ivec1)[0]; |
| l2c(m0, iv1); |
| l2c(m1, iv1); |
| |
| iv2 = &(*ivec2)[0]; |
| l2c(xor0, iv2); |
| l2c(xor1, iv2); |
| } |
| tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; |
| tin[0] = tin[1] = 0; |
| } |
| #endif |