/* ede_cbcm_enc.c */
-/* Written by Ben Laurie <ben@algroup.co.uk> for the OpenSSL
- * project 13 Feb 1999.
+/*
+ * Written by Ben Laurie <ben@algroup.co.uk> for the OpenSSL project 13 Feb
+ * 1999.
*/
/* ====================================================================
* Copyright (c) 1999 The OpenSSL Project. All rights reserved.
* are met:
*
* 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
+ * 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
*/
/*
-
-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
-
-*/
+ *
+ * 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"
+# 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;
+ 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;
+ 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;
+ 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
projects / openssl.git / blobdiff