SMS4算法实现

SMS4 algorithm implemented---SMS4算法实现

/* sms4.c

SMS4 Encryption algorithm for wireless networks

$Id: sms4.c 2009-12-31 14:41:57 tao.tang <$">[email protected]>$

This program is free software; you can redistribute it and/or

modify it under the terms of the GNU General Public License

as published by the Free Software Foundation; either version 2

of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc.

**/

/ define SMS4DBG flag for debug these code /

#define SMS4DBG

#ifdef SMS4DBG

#include

/ reserved for saving interface /

/#include "sms4.h"/

#ifndef unlong

typedef unsigned long unlong;

#endif / unlong /

#ifndef unchar

typedef unsigned char unchar;

#endif / unchar /

/ define SMS4CROL for rotating left /

#define SMS4CROL(uval, bits) ((uval << bits) | (uval >> (0x20 - bits)))

/ define MASK code for selecting expected bits from a 32 bits value /

#define SMS4MASK3 0xFF000000

#define SMS4MASK2 0x00FF0000

#define SMS4MASK1 0x0000FF00

#define SMS4MASK0 0x000000FF

/ Sbox table: 8bits input convert to 8 bits output/

static unchar SboxTable[16][16] =

{

{0xd6,0x90,0xe9,0xfe,0xcc,0xe1,0x3d,0xb7,0x16,0xb6,0x14,0xc2,0x28,0xfb,0x2c,0x05},

{0x2b,0x67,0x9a,0x76,0x2a,0xbe,0x04,0xc3,0xaa,0x44,0x13,0x26,0x49,0x86,0x06,0x99},

{0x9c,0x42,0x50,0xf4,0x91,0xef,0x98,0x7a,0x33,0x54,0x0b,0x43,0xed,0xcf,0xac,0x62},

{0xe4,0xb3,0x1c,0xa9,0xc9,0x08,0xe8,0x95,0x80,0xdf,0x94,0xfa,0x75,0x8f,0x3f,0xa6},

{0x47,0x07,0xa7,0xfc,0xf3,0x73,0x17,0xba,0x83,0x59,0x3c,0x19,0xe6,0x85,0x4f,0xa8},

{0x68,0x6b,0x81,0xb2,0x71,0x64,0xda,0x8b,0xf8,0xeb,0x0f,0x4b,0x70,0x56,0x9d,0x35},

{0x1e,0x24,0x0e,0x5e,0x63,0x58,0xd1,0xa2,0x25,0x22,0x7c,0x3b,0x01,0x21,0x78,0x87},

{0xd4,0x00,0x46,0x57,0x9f,0xd3,0x27,0x52,0x4c,0x36,0x02,0xe7,0xa0,0xc4,0xc8,0x9e},

{0xea,0xbf,0x8a,0xd2,0x40,0xc7,0x38,0xb5,0xa3,0xf7,0xf2,0xce,0xf9,0x61,0x15,0xa1},

{0xe0,0xae,0x5d,0xa4,0x9b,0x34,0x1a,0x55,0xad,0x93,0x32,0x30,0xf5,0x8c,0xb1,0xe3},

{0x1d,0xf6,0xe2,0x2e,0x82,0x66,0xca,0x60,0xc0,0x29,0x23,0xab,0x0d,0x53,0x4e,0x6f},

{0xd5,0xdb,0x37,0x45,0xde,0xfd,0x8e,0x2f,0x03,0xff,0x6a,0x72,0x6d,0x6c,0x5b,0x51},

{0x8d,0x1b,0xaf,0x92,0xbb,0xdd,0xbc,0x7f,0x11,0xd9,0x5c,0x41,0x1f,0x10,0x5a,0xd8},

{0x0a,0xc1,0x31,0x88,0xa5,0xcd,0x7b,0xbd,0x2d,0x74,0xd0,0x12,0xb8,0xe5,0xb4,0xb0},

{0x89,0x69,0x97,0x4a,0x0c,0x96,0x77,0x7e,0x65,0xb9,0xf1,0x09,0xc5,0x6e,0xc6,0x84},

{0x18,0xf0,0x7d,0xec,0x3a,0xdc,0x4d,0x20,0x79,0xee,0x5f,0x3e,0xd7,0xcb,0x39,0x48}

};

/ Encryption key: 128bits /

static unlong MK[4] = {0x01234567,0x89abcdef,0xfedcba98,0x76543210};

/ System parameter /

static unlong FK[4] = {0xa3b1bac6,0x56aa3350,0x677d9197,0xb27022dc};

/ fixed parameter /

static unlong CK[32] =

0x00070e15,0x1c232a31,0x383f464d,0x545b6269,

0x70777e85,0x8c939aa1,0xa8afb6bd,0xc4cbd2d9,

0xe0e7eef5,0xfc030a11,0x181f262d,0x343b4249,

0x50575e65,0x6c737a81,0x888f969d,0xa4abb2b9,

0xc0c7ced5,0xdce3eaf1,0xf8ff060d,0x141b2229,

0x30373e45,0x4c535a61,0x686f767d,0x848b9299,

0xa0a7aeb5,0xbcc3cad1,0xd8dfe6ed,0xf4fb0209,

0x10171e25,0x2c333a41,0x484f565d,0x646b7279

/ buffer for round encryption key /

static unlong ENRK[32];

static unlong DERK[32];

/ original contents for debugging /

unlong pData[4] =

0x01234567,

0x89abcdef,

0xfedcba98,

0x76543210

unlong pData2[9] =

0x76543210,

0x12121212,

0x34343434,

0x56565656,

0x78787878,

0x12341234

#endif / SMS4DBG /

/=============================================================================

private function:

look up in SboxTable and get the related value.

args: [in] inch: 0x00~0xFF (8 bits unsigned value).

============================================================================/

static unchar SMS4Sbox(unchar inch)

unchar pTable = (unchar )SboxTable;

unchar retVal = (unchar)(pTable[inch]);

}

/*=============================================================================

"T algorithm" == "L algorithm" + "t algorithm".

args: [in] a: a is a 32 bits unsigned value;

return: c: c is calculated with line algorithm "L" and nonline algorithm "t"

*============================================================================/

static unlong SMS4Lt(unlong a)

unlong b = 0;

unlong c = 0;

unchar a0 = (unchar)(a & SMS4MASK0);

unchar a1 = (unchar)((a & SMS4MASK1) >> 8);

unchar a2 = (unchar)((a & SMS4MASK2) >> 16);

unchar a3 = (unchar)((a & SMS4MASK3) >> 24);

unchar b0 = SMS4Sbox(a0);

unchar b1 = SMS4Sbox(a1);

unchar b2 = SMS4Sbox(a2);

unchar b3 = SMS4Sbox(a3);

Calculating round encryption key.

return: ENRK[i]: i{0,1,2,3,...31}.

static unlong SMS4CalciRK(unlong a)

unlong rk = 0;

args: [in] ulflag: if 0: not calculate DERK , else calculate;

return: NONE.

static void SMS4CalcRK(unlong ulflag)

unlong k[36];

unlong i = 0;

args: [in] a: a is a 32 bits unsigned value.

static unlong SMS4T(unlong a)

return (SMS4Lt(a));

Calculating and getting encryption/decryption contents.

args: [in] x0: original contents;

args: [in] x1: original contents;

args: [in] x2: original contents;

args: [in] x3: original contents;

args: [in] rk: encryption/decryption key;

return the contents of encryption/decryption contents.

static unlong SMS4F(unlong x0, unlong x1, unlong x2, unlong x3, unlong rk)

return (x0^SMS4Lt(x1^x2^x3^rk));

public function:

args: [in] ulkey: password defined by user(NULL: default encryption key);

args: [in] flag: if 0: not calculate DERK , else calculate;

return ulkey: NULL for default encryption key.

unlong SMS4SetKey(unlong ulkey, unlong flag)

if (ulkey != NULL)

memcpy(MK, ulkey, sizeof(MK));

sms4 encryption algorithm.

args: [in/out] psrc: a pointer point to original contents;

args: [in] lgsrc: the length of original contents;

args: [in] derk: a pointer point to encryption/decryption key;

return: pRet: a pointer point to encrypted contents.

unlong SMS4Encrypt(unlong psrc, unlong lgsrc, unlong rk[])

unlong *pRet = NULL;

#ifdef SMS4DBG0

printf("0x%08x, 0x%08x, 0x%08x, 0x%08x, \n",

ulbuf[0], ulbuf[1], ulbuf[2], ulbuf[3]);

#endif / SMS4DBG0 /

printf("0x%08x, \n", ulbuf[i+4]);

i++;

sms4 decryption algorithm.

args: [in/out] psrc: a pointer point to encrypted contents;

args: [in] lgsrc: the length of encrypted contents;

args: [in] derk: a pointer point to decryption key;

return: pRet: a pointer point to decrypted contents.

unlong SMS4Decrypt(unlong psrc, unlong lgsrc, unlong derk[])

void SMS4Encrypt1M()

/ entry-point for debugging /

int main()

SMS4SetKey(NULL, 1);