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      1 /* crypto/des/xcbc_enc.c */
      2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com)
      3  * All rights reserved.
      4  *
      5  * This package is an SSL implementation written
      6  * by Eric Young (eay (at) cryptsoft.com).
      7  * The implementation was written so as to conform with Netscapes SSL.
      8  *
      9  * This library is free for commercial and non-commercial use as long as
     10  * the following conditions are aheared to.  The following conditions
     11  * apply to all code found in this distribution, be it the RC4, RSA,
     12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
     13  * included with this distribution is covered by the same copyright terms
     14  * except that the holder is Tim Hudson (tjh (at) cryptsoft.com).
     15  *
     16  * Copyright remains Eric Young's, and as such any Copyright notices in
     17  * the code are not to be removed.
     18  * If this package is used in a product, Eric Young should be given attribution
     19  * as the author of the parts of the library used.
     20  * This can be in the form of a textual message at program startup or
     21  * in documentation (online or textual) provided with the package.
     22  *
     23  * Redistribution and use in source and binary forms, with or without
     24  * modification, are permitted provided that the following conditions
     25  * are met:
     26  * 1. Redistributions of source code must retain the copyright
     27  *    notice, this list of conditions and the following disclaimer.
     28  * 2. Redistributions in binary form must reproduce the above copyright
     29  *    notice, this list of conditions and the following disclaimer in the
     30  *    documentation and/or other materials provided with the distribution.
     31  * 3. All advertising materials mentioning features or use of this software
     32  *    must display the following acknowledgement:
     33  *    "This product includes cryptographic software written by
     34  *     Eric Young (eay (at) cryptsoft.com)"
     35  *    The word 'cryptographic' can be left out if the rouines from the library
     36  *    being used are not cryptographic related :-).
     37  * 4. If you include any Windows specific code (or a derivative thereof) from
     38  *    the apps directory (application code) you must include an acknowledgement:
     39  *    "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)"
     40  *
     41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
     42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     51  * SUCH DAMAGE.
     52  *
     53  * The licence and distribution terms for any publically available version or
     54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
     55  * copied and put under another distribution licence
     56  * [including the GNU Public Licence.]
     57  */
     58 
     59 #include "des_locl.h"
     60 
     61 /* RSA's DESX */
     62 
     63 #if 0 /* broken code, preserved just in case anyone specifically looks for this */
     64 static const unsigned char desx_white_in2out[256]={
     65 0xBD,0x56,0xEA,0xF2,0xA2,0xF1,0xAC,0x2A,0xB0,0x93,0xD1,0x9C,0x1B,0x33,0xFD,0xD0,
     66 0x30,0x04,0xB6,0xDC,0x7D,0xDF,0x32,0x4B,0xF7,0xCB,0x45,0x9B,0x31,0xBB,0x21,0x5A,
     67 0x41,0x9F,0xE1,0xD9,0x4A,0x4D,0x9E,0xDA,0xA0,0x68,0x2C,0xC3,0x27,0x5F,0x80,0x36,
     68 0x3E,0xEE,0xFB,0x95,0x1A,0xFE,0xCE,0xA8,0x34,0xA9,0x13,0xF0,0xA6,0x3F,0xD8,0x0C,
     69 0x78,0x24,0xAF,0x23,0x52,0xC1,0x67,0x17,0xF5,0x66,0x90,0xE7,0xE8,0x07,0xB8,0x60,
     70 0x48,0xE6,0x1E,0x53,0xF3,0x92,0xA4,0x72,0x8C,0x08,0x15,0x6E,0x86,0x00,0x84,0xFA,
     71 0xF4,0x7F,0x8A,0x42,0x19,0xF6,0xDB,0xCD,0x14,0x8D,0x50,0x12,0xBA,0x3C,0x06,0x4E,
     72 0xEC,0xB3,0x35,0x11,0xA1,0x88,0x8E,0x2B,0x94,0x99,0xB7,0x71,0x74,0xD3,0xE4,0xBF,
     73 0x3A,0xDE,0x96,0x0E,0xBC,0x0A,0xED,0x77,0xFC,0x37,0x6B,0x03,0x79,0x89,0x62,0xC6,
     74 0xD7,0xC0,0xD2,0x7C,0x6A,0x8B,0x22,0xA3,0x5B,0x05,0x5D,0x02,0x75,0xD5,0x61,0xE3,
     75 0x18,0x8F,0x55,0x51,0xAD,0x1F,0x0B,0x5E,0x85,0xE5,0xC2,0x57,0x63,0xCA,0x3D,0x6C,
     76 0xB4,0xC5,0xCC,0x70,0xB2,0x91,0x59,0x0D,0x47,0x20,0xC8,0x4F,0x58,0xE0,0x01,0xE2,
     77 0x16,0x38,0xC4,0x6F,0x3B,0x0F,0x65,0x46,0xBE,0x7E,0x2D,0x7B,0x82,0xF9,0x40,0xB5,
     78 0x1D,0x73,0xF8,0xEB,0x26,0xC7,0x87,0x97,0x25,0x54,0xB1,0x28,0xAA,0x98,0x9D,0xA5,
     79 0x64,0x6D,0x7A,0xD4,0x10,0x81,0x44,0xEF,0x49,0xD6,0xAE,0x2E,0xDD,0x76,0x5C,0x2F,
     80 0xA7,0x1C,0xC9,0x09,0x69,0x9A,0x83,0xCF,0x29,0x39,0xB9,0xE9,0x4C,0xFF,0x43,0xAB,
     81 	};
     82 
     83 void DES_xwhite_in2out(const_DES_cblock *des_key, const_DES_cblock *in_white,
     84 	     DES_cblock *out_white)
     85 	{
     86 	int out0,out1;
     87 	int i;
     88 	const unsigned char *key = &(*des_key)[0];
     89 	const unsigned char *in = &(*in_white)[0];
     90 	unsigned char *out = &(*out_white)[0];
     91 
     92 	out[0]=out[1]=out[2]=out[3]=out[4]=out[5]=out[6]=out[7]=0;
     93 	out0=out1=0;
     94 	for (i=0; i<8; i++)
     95 		{
     96 		out[i]=key[i]^desx_white_in2out[out0^out1];
     97 		out0=out1;
     98 		out1=(int)out[i&0x07];
     99 		}
    100 
    101 	out0=out[0];
    102 	out1=out[i]; /* BUG: out-of-bounds read */
    103 	for (i=0; i<8; i++)
    104 		{
    105 		out[i]=in[i]^desx_white_in2out[out0^out1];
    106 		out0=out1;
    107 		out1=(int)out[i&0x07];
    108 		}
    109 	}
    110 #endif
    111 
    112 void DES_xcbc_encrypt(const unsigned char *in, unsigned char *out,
    113 		      long length, DES_key_schedule *schedule,
    114 		      DES_cblock *ivec, const_DES_cblock *inw,
    115 		      const_DES_cblock *outw, int enc)
    116 	{
    117 	register DES_LONG tin0,tin1;
    118 	register DES_LONG tout0,tout1,xor0,xor1;
    119 	register DES_LONG inW0,inW1,outW0,outW1;
    120 	register const unsigned char *in2;
    121 	register long l=length;
    122 	DES_LONG tin[2];
    123 	unsigned char *iv;
    124 
    125 	in2 = &(*inw)[0];
    126 	c2l(in2,inW0);
    127 	c2l(in2,inW1);
    128 	in2 = &(*outw)[0];
    129 	c2l(in2,outW0);
    130 	c2l(in2,outW1);
    131 
    132 	iv = &(*ivec)[0];
    133 
    134 	if (enc)
    135 		{
    136 		c2l(iv,tout0);
    137 		c2l(iv,tout1);
    138 		for (l-=8; l>=0; l-=8)
    139 			{
    140 			c2l(in,tin0);
    141 			c2l(in,tin1);
    142 			tin0^=tout0^inW0; tin[0]=tin0;
    143 			tin1^=tout1^inW1; tin[1]=tin1;
    144 			DES_encrypt1(tin,schedule,DES_ENCRYPT);
    145 			tout0=tin[0]^outW0; l2c(tout0,out);
    146 			tout1=tin[1]^outW1; l2c(tout1,out);
    147 			}
    148 		if (l != -8)
    149 			{
    150 			c2ln(in,tin0,tin1,l+8);
    151 			tin0^=tout0^inW0; tin[0]=tin0;
    152 			tin1^=tout1^inW1; tin[1]=tin1;
    153 			DES_encrypt1(tin,schedule,DES_ENCRYPT);
    154 			tout0=tin[0]^outW0; l2c(tout0,out);
    155 			tout1=tin[1]^outW1; l2c(tout1,out);
    156 			}
    157 		iv = &(*ivec)[0];
    158 		l2c(tout0,iv);
    159 		l2c(tout1,iv);
    160 		}
    161 	else
    162 		{
    163 		c2l(iv,xor0);
    164 		c2l(iv,xor1);
    165 		for (l-=8; l>0; l-=8)
    166 			{
    167 			c2l(in,tin0); tin[0]=tin0^outW0;
    168 			c2l(in,tin1); tin[1]=tin1^outW1;
    169 			DES_encrypt1(tin,schedule,DES_DECRYPT);
    170 			tout0=tin[0]^xor0^inW0;
    171 			tout1=tin[1]^xor1^inW1;
    172 			l2c(tout0,out);
    173 			l2c(tout1,out);
    174 			xor0=tin0;
    175 			xor1=tin1;
    176 			}
    177 		if (l != -8)
    178 			{
    179 			c2l(in,tin0); tin[0]=tin0^outW0;
    180 			c2l(in,tin1); tin[1]=tin1^outW1;
    181 			DES_encrypt1(tin,schedule,DES_DECRYPT);
    182 			tout0=tin[0]^xor0^inW0;
    183 			tout1=tin[1]^xor1^inW1;
    184 			l2cn(tout0,tout1,out,l+8);
    185 			xor0=tin0;
    186 			xor1=tin1;
    187 			}
    188 
    189 		iv = &(*ivec)[0];
    190 		l2c(xor0,iv);
    191 		l2c(xor1,iv);
    192 		}
    193 	tin0=tin1=tout0=tout1=xor0=xor1=0;
    194 	inW0=inW1=outW0=outW1=0;
    195 	tin[0]=tin[1]=0;
    196 	}
    197 
    198