/* crypto/rc5/rc5_enc.c */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * 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.] */ #include #include #include "rc5_locl.h" void RC5_32_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, RC5_32_KEY *ks, unsigned char *iv, int encrypt) { register unsigned long tin0,tin1; register unsigned long tout0,tout1,xor0,xor1; register long l=length; unsigned long tin[2]; if (encrypt) { c2l(iv,tout0); c2l(iv,tout1); iv-=8; for (l-=8; l>=0; l-=8) { c2l(in,tin0); c2l(in,tin1); tin0^=tout0; tin1^=tout1; tin[0]=tin0; tin[1]=tin1; RC5_32_encrypt(tin,ks); tout0=tin[0]; l2c(tout0,out); tout1=tin[1]; l2c(tout1,out); } if (l != -8) { c2ln(in,tin0,tin1,l+8); tin0^=tout0; tin1^=tout1; tin[0]=tin0; tin[1]=tin1; RC5_32_encrypt(tin,ks); tout0=tin[0]; l2c(tout0,out); tout1=tin[1]; l2c(tout1,out); } l2c(tout0,iv); l2c(tout1,iv); } else { c2l(iv,xor0); c2l(iv,xor1); iv-=8; for (l-=8; l>=0; l-=8) { c2l(in,tin0); tin[0]=tin0; c2l(in,tin1); tin[1]=tin1; RC5_32_decrypt(tin,ks); tout0=tin[0]^xor0; tout1=tin[1]^xor1; l2c(tout0,out); l2c(tout1,out); xor0=tin0; xor1=tin1; } if (l != -8) { c2l(in,tin0); tin[0]=tin0; c2l(in,tin1); tin[1]=tin1; RC5_32_decrypt(tin,ks); tout0=tin[0]^xor0; tout1=tin[1]^xor1; l2cn(tout0,tout1,out,l+8); xor0=tin0; xor1=tin1; } l2c(xor0,iv); l2c(xor1,iv); } tin0=tin1=tout0=tout1=xor0=xor1=0; tin[0]=tin[1]=0; } void RC5_32_encrypt(unsigned long *d, RC5_32_KEY *key) { RC5_32_INT a,b,*s; s=key->data; a=d[0]+s[0]; b=d[1]+s[1]; E_RC5_32(a,b,s, 2); E_RC5_32(a,b,s, 4); E_RC5_32(a,b,s, 6); E_RC5_32(a,b,s, 8); E_RC5_32(a,b,s,10); E_RC5_32(a,b,s,12); E_RC5_32(a,b,s,14); E_RC5_32(a,b,s,16); if (key->rounds == 12) { E_RC5_32(a,b,s,18); E_RC5_32(a,b,s,20); E_RC5_32(a,b,s,22); E_RC5_32(a,b,s,24); } else if (key->rounds == 16) { /* Do a full expansion to avoid a jump */ E_RC5_32(a,b,s,18); E_RC5_32(a,b,s,20); E_RC5_32(a,b,s,22); E_RC5_32(a,b,s,24); E_RC5_32(a,b,s,26); E_RC5_32(a,b,s,28); E_RC5_32(a,b,s,30); E_RC5_32(a,b,s,32); } d[0]=a; d[1]=b; } void RC5_32_decrypt(unsigned long *d, RC5_32_KEY *key) { RC5_32_INT a,b,*s; s=key->data; a=d[0]; b=d[1]; if (key->rounds == 16) { D_RC5_32(a,b,s,32); D_RC5_32(a,b,s,30); D_RC5_32(a,b,s,28); D_RC5_32(a,b,s,26); /* Do a full expansion to avoid a jump */ D_RC5_32(a,b,s,24); D_RC5_32(a,b,s,22); D_RC5_32(a,b,s,20); D_RC5_32(a,b,s,18); } else if (key->rounds == 12) { D_RC5_32(a,b,s,24); D_RC5_32(a,b,s,22); D_RC5_32(a,b,s,20); D_RC5_32(a,b,s,18); } D_RC5_32(a,b,s,16); D_RC5_32(a,b,s,14); D_RC5_32(a,b,s,12); D_RC5_32(a,b,s,10); D_RC5_32(a,b,s, 8); D_RC5_32(a,b,s, 6); D_RC5_32(a,b,s, 4); D_RC5_32(a,b,s, 2); d[0]=a-s[0]; d[1]=b-s[1]; }