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Diffstat (limited to 'openssl/crypto/rc2/rc2_cbc.c')
| -rw-r--r-- | openssl/crypto/rc2/rc2_cbc.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/openssl/crypto/rc2/rc2_cbc.c b/openssl/crypto/rc2/rc2_cbc.c new file mode 100644 index 00000000..74f48d3d --- /dev/null +++ b/openssl/crypto/rc2/rc2_cbc.c @@ -0,0 +1,226 @@ +/* crypto/rc2/rc2_cbc.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 <openssl/rc2.h> +#include "rc2_locl.h" + +void RC2_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, + RC2_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; + RC2_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; + RC2_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; + RC2_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; + RC2_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 RC2_encrypt(unsigned long *d, RC2_KEY *key) + { + int i,n; + register RC2_INT *p0,*p1; + register RC2_INT x0,x1,x2,x3,t; + unsigned long l; + + l=d[0]; + x0=(RC2_INT)l&0xffff; + x1=(RC2_INT)(l>>16L); + l=d[1]; + x2=(RC2_INT)l&0xffff; + x3=(RC2_INT)(l>>16L); + + n=3; + i=5; + + p0=p1= &(key->data[0]); + for (;;) + { + t=(x0+(x1& ~x3)+(x2&x3)+ *(p0++))&0xffff; + x0=(t<<1)|(t>>15); + t=(x1+(x2& ~x0)+(x3&x0)+ *(p0++))&0xffff; + x1=(t<<2)|(t>>14); + t=(x2+(x3& ~x1)+(x0&x1)+ *(p0++))&0xffff; + x2=(t<<3)|(t>>13); + t=(x3+(x0& ~x2)+(x1&x2)+ *(p0++))&0xffff; + x3=(t<<5)|(t>>11); + + if (--i == 0) + { + if (--n == 0) break; + i=(n == 2)?6:5; + + x0+=p1[x3&0x3f]; + x1+=p1[x0&0x3f]; + x2+=p1[x1&0x3f]; + x3+=p1[x2&0x3f]; + } + } + + d[0]=(unsigned long)(x0&0xffff)|((unsigned long)(x1&0xffff)<<16L); + d[1]=(unsigned long)(x2&0xffff)|((unsigned long)(x3&0xffff)<<16L); + } + +void RC2_decrypt(unsigned long *d, RC2_KEY *key) + { + int i,n; + register RC2_INT *p0,*p1; + register RC2_INT x0,x1,x2,x3,t; + unsigned long l; + + l=d[0]; + x0=(RC2_INT)l&0xffff; + x1=(RC2_INT)(l>>16L); + l=d[1]; + x2=(RC2_INT)l&0xffff; + x3=(RC2_INT)(l>>16L); + + n=3; + i=5; + + p0= &(key->data[63]); + p1= &(key->data[0]); + for (;;) + { + t=((x3<<11)|(x3>>5))&0xffff; + x3=(t-(x0& ~x2)-(x1&x2)- *(p0--))&0xffff; + t=((x2<<13)|(x2>>3))&0xffff; + x2=(t-(x3& ~x1)-(x0&x1)- *(p0--))&0xffff; + t=((x1<<14)|(x1>>2))&0xffff; + x1=(t-(x2& ~x0)-(x3&x0)- *(p0--))&0xffff; + t=((x0<<15)|(x0>>1))&0xffff; + x0=(t-(x1& ~x3)-(x2&x3)- *(p0--))&0xffff; + + if (--i == 0) + { + if (--n == 0) break; + i=(n == 2)?6:5; + + x3=(x3-p1[x2&0x3f])&0xffff; + x2=(x2-p1[x1&0x3f])&0xffff; + x1=(x1-p1[x0&0x3f])&0xffff; + x0=(x0-p1[x3&0x3f])&0xffff; + } + } + + d[0]=(unsigned long)(x0&0xffff)|((unsigned long)(x1&0xffff)<<16L); + d[1]=(unsigned long)(x2&0xffff)|((unsigned long)(x3&0xffff)<<16L); + } + |