235 lines
6.3 KiB
C
235 lines
6.3 KiB
C
/* crypto/rc2/rc2_cbc.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 "rc2.h"
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#include "rc2_locl.h"
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void RC2_cbc_encrypt(in, out, length, ks, iv, encrypt)
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unsigned char *in;
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unsigned char *out;
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long length;
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RC2_KEY *ks;
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unsigned char *iv;
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int encrypt;
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{
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register unsigned long tin0,tin1;
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register unsigned long tout0,tout1,xor0,xor1;
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register long l=length;
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unsigned long tin[2];
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if (encrypt)
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{
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c2l(iv,tout0);
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c2l(iv,tout1);
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iv-=8;
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for (l-=8; l>=0; l-=8)
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{
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c2l(in,tin0);
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c2l(in,tin1);
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tin0^=tout0;
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tin1^=tout1;
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tin[0]=tin0;
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tin[1]=tin1;
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RC2_encrypt(tin,ks);
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tout0=tin[0]; l2c(tout0,out);
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tout1=tin[1]; l2c(tout1,out);
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}
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if (l != -8)
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{
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c2ln(in,tin0,tin1,l+8);
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tin0^=tout0;
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tin1^=tout1;
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tin[0]=tin0;
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tin[1]=tin1;
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RC2_encrypt(tin,ks);
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tout0=tin[0]; l2c(tout0,out);
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tout1=tin[1]; l2c(tout1,out);
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}
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l2c(tout0,iv);
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l2c(tout1,iv);
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}
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else
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{
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c2l(iv,xor0);
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c2l(iv,xor1);
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iv-=8;
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for (l-=8; l>=0; l-=8)
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{
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c2l(in,tin0); tin[0]=tin0;
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c2l(in,tin1); tin[1]=tin1;
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RC2_decrypt(tin,ks);
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tout0=tin[0]^xor0;
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tout1=tin[1]^xor1;
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l2c(tout0,out);
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l2c(tout1,out);
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xor0=tin0;
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xor1=tin1;
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}
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if (l != -8)
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{
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c2l(in,tin0); tin[0]=tin0;
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c2l(in,tin1); tin[1]=tin1;
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RC2_decrypt(tin,ks);
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tout0=tin[0]^xor0;
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tout1=tin[1]^xor1;
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l2cn(tout0,tout1,out,l+8);
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xor0=tin0;
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xor1=tin1;
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}
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l2c(xor0,iv);
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l2c(xor1,iv);
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}
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tin0=tin1=tout0=tout1=xor0=xor1=0;
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tin[0]=tin[1]=0;
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}
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void RC2_encrypt(d,key)
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unsigned long *d;
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RC2_KEY *key;
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{
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int i,n;
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register RC2_INT *p0,*p1;
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register RC2_INT x0,x1,x2,x3,t;
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unsigned long l;
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l=d[0];
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x0=(RC2_INT)l&0xffff;
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x1=(RC2_INT)(l>>16L);
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l=d[1];
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x2=(RC2_INT)l&0xffff;
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x3=(RC2_INT)(l>>16L);
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n=3;
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i=5;
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p0=p1= &(key->data[0]);
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for (;;)
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{
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t=(x0+(x1& ~x3)+(x2&x3)+ *(p0++))&0xffff;
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x0=(t<<1)|(t>>15);
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t=(x1+(x2& ~x0)+(x3&x0)+ *(p0++))&0xffff;
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x1=(t<<2)|(t>>14);
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t=(x2+(x3& ~x1)+(x0&x1)+ *(p0++))&0xffff;
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x2=(t<<3)|(t>>13);
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t=(x3+(x0& ~x2)+(x1&x2)+ *(p0++))&0xffff;
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x3=(t<<5)|(t>>11);
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if (--i == 0)
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{
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if (--n == 0) break;
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i=(n == 2)?6:5;
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x0+=p1[x3&0x3f];
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x1+=p1[x0&0x3f];
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x2+=p1[x1&0x3f];
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x3+=p1[x2&0x3f];
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}
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}
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d[0]=(unsigned long)(x0&0xffff)|((unsigned long)(x1&0xffff)<<16L);
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d[1]=(unsigned long)(x2&0xffff)|((unsigned long)(x3&0xffff)<<16L);
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}
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void RC2_decrypt(d,key)
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unsigned long *d;
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RC2_KEY *key;
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{
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int i,n;
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register RC2_INT *p0,*p1;
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register RC2_INT x0,x1,x2,x3,t;
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unsigned long l;
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l=d[0];
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x0=(RC2_INT)l&0xffff;
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x1=(RC2_INT)(l>>16L);
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l=d[1];
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x2=(RC2_INT)l&0xffff;
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x3=(RC2_INT)(l>>16L);
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n=3;
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i=5;
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p0= &(key->data[63]);
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p1= &(key->data[0]);
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for (;;)
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{
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t=((x3<<11)|(x3>>5))&0xffff;
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x3=(t-(x0& ~x2)-(x1&x2)- *(p0--))&0xffff;
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t=((x2<<13)|(x2>>3))&0xffff;
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x2=(t-(x3& ~x1)-(x0&x1)- *(p0--))&0xffff;
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t=((x1<<14)|(x1>>2))&0xffff;
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x1=(t-(x2& ~x0)-(x3&x0)- *(p0--))&0xffff;
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t=((x0<<15)|(x0>>1))&0xffff;
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x0=(t-(x1& ~x3)-(x2&x3)- *(p0--))&0xffff;
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if (--i == 0)
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{
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if (--n == 0) break;
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i=(n == 2)?6:5;
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x3=(x3-p1[x2&0x3f])&0xffff;
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x2=(x2-p1[x1&0x3f])&0xffff;
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x1=(x1-p1[x0&0x3f])&0xffff;
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x0=(x0-p1[x3&0x3f])&0xffff;
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}
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}
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d[0]=(unsigned long)(x0&0xffff)|((unsigned long)(x1&0xffff)<<16L);
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d[1]=(unsigned long)(x2&0xffff)|((unsigned long)(x3&0xffff)<<16L);
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}
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