des加密算法是一种对称加密算法，通常要求8字节对齐，如果不满足8字节，则补全到8字节的整数倍，通常的做法是缺几补几，比如21字节的内容，则需要补三个3.
/*********************************************************
* des.h * 用户使用des算法头文件 * *********************************************************/#ifndef _OPENDESS_H_#define _OPENDESS_H_#ifdef __cplusplus
extern "C" { #endif//ab\0defg
//用户使用的函数
int DesEnc( unsigned char *pInData, int nInDataLen, unsigned char *pOutData, int *pOutDataLen);//用户使用函数des解密
int DesDec( unsigned char *pInData, int nInDataLen, unsigned char *pOutData, int *pOutDataLen);#ifdef __cplusplus
}#endif#endif
/******************************************************
* * des.c * common des...... * ******************************************************/#include <stdlib.h>
#include <string.h>#include <stdio.h>#include "des.h"/*********************************************************
data type definition for Des;**********************************************************/#define EN0 0#define DE1 1#define DES_KEYBYTES 128
#define DES_KEYLONGS 32#define DES_BLOCKLEN 8typedef struct {
unsigned char ek[DES_KEYBYTES]; int ekLen; unsigned char dk[DES_KEYBYTES]; int dkLen; unsigned char CbcCtx[DES_BLOCKLEN];} DES_CTX;typedef struct {
unsigned char ek1[DES_KEYBYTES]; int ek1Len; unsigned char dk1[DES_KEYBYTES]; int dk1Len; unsigned char ek2[DES_KEYBYTES]; int ek2Len; unsigned char dk2[DES_KEYBYTES]; int dk2Len; unsigned char CbcCtx[DES_BLOCKLEN]; //int IsFirstBlock;} DES3_CTX; static unsigned char pc1[56] = { 56, 48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35, 62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 60, 52, 44, 36, 28, 20, 12, 4, 27, 19, 11, 3 };static unsigned char pc2[48] = {
13, 16, 10, 23, 0, 4, 2, 27, 14, 5, 20, 9, 22, 18, 11, 3, 25, 7, 15, 6, 26, 19, 12, 1, 40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47, 43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31 };static unsigned short bytebit[8] = {0200,0100,040,020,010,04,02,01 };
static unsigned char totrot[16] = {1,2,4,6,8,10,12,14,15,17,19,21,23,25,27,28};static unsigned long bigbyte[24] = { 0x800000L, 0x400000L, 0x200000L, 0x100000L, 0x80000L, 0x40000L, 0x20000L, 0x10000L, 0x8000L, 0x4000L, 0x2000L, 0x1000L, 0x800L, 0x400L, 0x200L, 0x100L, 0x80L, 0x40L, 0x20L, 0x10L, 0x8L, 0x4L, 0x2L, 0x1L };//insert digits
static unsigned long SP1[64] ={ 0x01010400l,0x00000000l,0x00010000l,0x01010404l, 0x01010004l,0x00010404l,0x00000004l,0x00010000l, 0x00000400l,0x01010400l,0x01010404l,0x00000400l, 0x01000404l,0x01010004l,0x01000000l,0x00000004l, 0x00000404l,0x01000400l,0x01000400l,0x00010400l, 0x00010400l,0x01010000l,0x01010000l,0x01000404l, 0x00010004l,0x01000004l,0x01000004l,0x00010004l, 0x00000000l,0x00000404l,0x00010404l,0x01000000l, 0x00010000l,0x01010404l,0x00000004l,0x01010000l, 0x01010400l,0x01000000l,0x01000000l,0x00000400l, 0x01010004l,0x00010000l,0x00010400l,0x01000004l, 0x00000400l,0x00000004l,0x01000404l,0x00010404l, 0x01010404l,0x00010004l,0x01010000l,0x01000404l, 0x01000004l,0x00000404l,0x00010404l,0x01010400l, 0x00000404l,0x01000400l,0x01000400l,0x00000000l, 0x00010004l,0x00010400l,0x00000000l,0x01010004l };static unsigned long SP2[64]={ 0x80108020l,0x80008000l,0x00008000l,0x00108020l, 0x00100000l,0x00000020l,0x80100020l,0x80008020l, 0x80000020l,0x80108020l,0x80108000l,0x80000000l, 0x80008000l,0x00100000l,0x00000020l,0x80100020l, 0x00108000l,0x00100020l,0x80008020l,0x00000000l, 0x80000000l,0x00008000l,0x00108020l,0x80100000l, 0x00100020l,0x80000020l,0x00000000l,0x00108000l, 0x00008020l,0x80108000l,0x80100000l,0x00008020l, 0x00000000l,0x00108020l,0x80100020l,0x00100000l, 0x80008020l,0x80100000l,0x80108000l,0x00008000l, 0x80100000l,0x80008000l,0x00000020l,0x80108020l, 0x00108020l,0x00000020l,0x00008000l,0x80000000l, 0x00008020l,0x80108000l,0x00100000l,0x80000020l, 0x00100020l,0x80008020l,0x80000020l,0x00100020l, 0x00108000l,0x00000000l,0x80008000l,0x00008020l, 0x80000000l,0x80100020l,0x80108020l,0x00108000l };static unsigned long SP3[64]={ 0x00000208l,0x08020200l,0x00000000l,0x08020008l, 0x08000200l,0x00000000l,0x00020208l,0x08000200l, 0x00020008l,0x08000008l,0x08000008l,0x00020000l, 0x08020208l,0x00020008l,0x08020000l,0x00000208l, 0x08000000l,0x00000008l,0x08020200l,0x00000200l, 0x00020200l,0x08020000l,0x08020008l,0x00020208l, 0x08000208l,0x00020200l,0x00020000l,0x08000208l, 0x00000008l,0x08020208l,0x00000200l,0x08000000l, 0x08020200l,0x08000000l,0x00020008l,0x00000208l, 0x00020000l,0x08020200l,0x08000200l,0x00000000l, 0x00000200l,0x00020008l,0x08020208l,0x08000200l, 0x08000008l,0x00000200l,0x00000000l,0x08020008l, 0x08000208l,0x00020000l,0x08000000l,0x08020208l, 0x00000008l,0x00020208l,0x00020200l,0x08000008l, 0x08020000l,0x08000208l,0x00000208l,0x08020000l, 0x00020208l,0x00000008l,0x08020008l,0x00020200l };static unsigned long SP4[64]={ 0x00802001l,0x00002081l,0x00002081l,0x00000080l, 0x00802080l,0x00800081l,0x00800001l,0x00002001l, 0x00000000l,0x00802000l,0x00802000l,0x00802081l, 0x00000081l,0x00000000l,0x00800080l,0x00800001l, 0x00000001l,0x00002000l,0x00800000l,0x00802001l, 0x00000080l,0x00800000l,0x00002001l,0x00002080l, 0x00800081l,0x00000001l,0x00002080l,0x00800080l, 0x00002000l,0x00802080l,0x00802081l,0x00000081l, 0x00800080l,0x00800001l,0x00802000l,0x00802081l, 0x00000081l,0x00000000l,0x00000000l,0x00802000l, 0x00002080l,0x00800080l,0x00800081l,0x00000001l, 0x00802001l,0x00002081l,0x00002081l,0x00000080l, 0x00802081l,0x00000081l,0x00000001l,0x00002000l, 0x00800001l,0x00002001l,0x00802080l,0x00800081l, 0x00002001l,0x00002080l,0x00800000l,0x00802001l, 0x00000080l,0x00800000l,0x00002000l,0x00802080l };static unsigned long SP5[64]={ 0x00000100l,0x02080100l,0x02080000l,0x42000100l, 0x00080000l,0x00000100l,0x40000000l,0x02080000l, 0x40080100l,0x00080000l,0x02000100l,0x40080100l, 0x42000100l,0x42080000l,0x00080100l,0x40000000l, 0x02000000l,0x40080000l,0x40080000l,0x00000000l, 0x40000100l,0x42080100l,0x42080100l,0x02000100l, 0x42080000l,0x40000100l,0x00000000l,0x42000000l, 0x02080100l,0x02000000l,0x42000000l,0x00080100l, 0x00080000l,0x42000100l,0x00000100l,0x02000000l, 0x40000000l,0x02080000l,0x42000100l,0x40080100l, 0x02000100l,0x40000000l,0x42080000l,0x02080100l, 0x40080100l,0x00000100l,0x20000000l,0x42080000l, 0x42080100l,0x00080100l,0x42000000l,0x42080100l, 0x02080000l,0x02000100l,0x40000100l,0x00080000l, 0x00080100l,0x02000100l,0x40000100l,0x00080000l, 0x00000000l,0x40080000l,0x02080100l,0x40000100l };static unsigned long SP6[64]={ 0x20000010l,0x20400000l,0x00004000l,0x20404010l, 0x20400000l,0x00000010l,0x20404010l,0x00400000l, 0x20004000l,0x00404010l,0x00400000l,0x20000010l, 0x00400010l,0x20004000l,0x20000000l,0x00004010l, 0x00000000l,0x00400010l,0x20004010l,0x00004000l, 0x00404000l,0x20004010l,0x00000010l,0x20400010l, 0x20400010l,0x00000000l,0x00404010l,0x20404000l, 0x00004010l,0x00404000l,0x20404000l,0x20000000l, 0x20004000l,0x00000010l,0x20400010l,0x00404000l, 0x20404010l,0x00400000l,0x00004010l,0x20000010l, 0x00400000l,0x20004000l,0x20000000l,0x00004010l, 0x20000010l,0x20404010l,0x00404000l,0x20400000l, 0x00404010l,0x20404000l,0x00000000l,0x20400010l, 0x00000010l,0x00004000l,0x20400000l,0x00404010l, 0x00004000l,0x00400010l,0x20004010l,0x00000000l, 0x20404000l,0x20000000l,0x00400010l,0x20004010l }; static unsigned long SP7[64] = { 0x00200000L, 0x04200002L, 0x04000802L, 0x00000000L, 0x00000800L, 0x04000802L, 0x00200802L, 0x04200800L, 0x04200802L, 0x00200000L, 0x00000000L, 0x04000002L, 0x00000002L, 0x04000000L, 0x04200002L, 0x00000802L, 0x04000800L, 0x00200802L, 0x00200002L, 0x04000800L, 0x04000002L, 0x04200000L, 0x04200800L, 0x00200002L, 0x04200000L, 0x00000800L, 0x00000802L, 0x04200802L, 0x00200800L, 0x00000002L, 0x04000000L, 0x00200800L, 0x04000000L, 0x00200800L, 0x00200000L, 0x04000802L, 0x04000802L, 0x04200002L, 0x04200002L, 0x00000002L, 0x00200002L, 0x04000000L, 0x04000800L, 0x00200000L, 0x04200800L, 0x00000802L, 0x00200802L, 0x04200800L, 0x00000802L, 0x04000002L, 0x04200802L, 0x04200000L, 0x00200800L, 0x00000000L, 0x00000002L, 0x04200802L, 0x00000000L, 0x00200802L, 0x04200000L, 0x00000800L, 0x04000002L, 0x04000800L, 0x00000800L, 0x00200002L };static unsigned long SP8[64] = { 0x10001040L, 0x00001000L, 0x00040000L, 0x10041040L, 0x10000000L, 0x10001040L, 0x00000040L, 0x10000000L, 0x00040040L, 0x10040000L, 0x10041040L, 0x00041000L, 0x10041000L, 0x00041040L, 0x00001000L, 0x00000040L, 0x10040000L, 0x10000040L, 0x10001000L, 0x00001040L, 0x00041000L, 0x00040040L, 0x10040040L, 0x10041000L, 0x00001040L, 0x00000000L, 0x00000000L, 0x10040040L, 0x10000040L, 0x10001000L, 0x00041040L, 0x00040000L, 0x00041040L, 0x00040000L, 0x10041000L, 0x00001000L, 0x00000040L, 0x10040040L, 0x00001000L, 0x00041040L, 0x10001000L, 0x00000040L, 0x10000040L, 0x10040000L, 0x10040040L, 0x10000000L, 0x00040000L, 0x10001040L, 0x00000000L, 0x10041040L, 0x00040040L, 0x10000040L, 0x10040000L, 0x10001000L, 0x10001040L, 0x00000000L, 0x10041040L, 0x00041000L, 0x00041000L, 0x00001040L, 0x00001040L, 0x00040040L, 0x10000000L, 0x10041000L };void deskey(unsigned char *key,short edf, unsigned long *kn);
void cookey(register unsigned long *raw1, unsigned long *dough);//void cpkey(register unsigned long *into);//void usekey(register unsigned long *from);//void des(unsigned char *inblock,unsigned char *outblock);void scrunch(register unsigned char *outof, register unsigned long *into);void unscrun(register unsigned long *outof, register unsigned char *into);void desfunc(register unsigned long *block,register unsigned long *keys);/***************** DES Function *****************/
unsigned long OPENCOMM_DesExpandEncKey( unsigned char *pbDesKey, unsigned long ulDesKeyLen, unsigned char *pbDesEncKey, unsigned long *ulDesEncKeyLen);unsigned long OPENCOMM_DesExpandDecKey(
unsigned char *pbDesKey, unsigned long ulDesKeyLen, unsigned char *pbDesDecKey, unsigned long *ulDesDecKeyLen);unsigned long OPENCOMM_DesEncRaw(
unsigned char *pbDesEncKey, unsigned long ulDesEncKeyLen, unsigned char *pbInData, unsigned long ulInDataLen, unsigned char *pbOutData, unsigned long *ulOutDataLen);unsigned long OPENCOMM_DesDecRaw(
unsigned char *pbDesDecKey, unsigned long ulDesDecKeyLen, unsigned char *pbInData, unsigned long ulInDataLen, unsigned char *pbOutData, unsigned long *ulOutDataLen); int myic_DESDecrypt( unsigned char *pDesKey, int nDesKeyLen, unsigned char *pInData, int nInDataLen, unsigned char *pOutData, int *pOutDataLen);int myic_DESEncrypt(
unsigned char *pDesKey, int nDesKeyLen, unsigned char *pInData, int nInDataLen, unsigned char *pOutData, int *pOutDataLen); void deskey(unsigned char *key,short edf, unsigned long *kn){ register int i, j, l, m, n; unsigned long pc1m[56],pcr[56]; for ( j = 0; j < 56; j++ ) { l = pc1[j]; m = l & 07; pc1m[j] = (((unsigned long) key[l >> 3] & (unsigned long)bytebit[m] ) ? 1:0); } for ( i = 0;i < 16; i++) { if ( edf == DE1 ) m = (15 - i) << 1; else m = i << 1; n = m + 1; kn[m] = kn[n] = 0L; for ( j = 0; j < 28; j++ ) { l = j + totrot[i]; if ( l < 28 ) pcr[j] = pc1m[l]; else pcr[j] = pc1m[l-28]; } for (j = 28; j < 56; j++ ) { l = j + totrot[i]; if ( l < 56 ) pcr[j] = pc1m[l]; else pcr[j] = pc1m[l-28]; } for ( j = 0; j < 24; j++ ) { if ( pcr[pc2[j]] ) kn[m] |= bigbyte[j]; if ( pcr[pc2[j+24]] ) kn[n] |= bigbyte[j]; } } return;}void cookey(register unsigned long *raw1, unsigned long *dough)
{ register unsigned long *cook,*raw0; register int i; cook = dough; for ( i = 0; i < 16; i++, raw1++ ) { raw0 = raw1++; *cook = (*raw0 & 0x00fc0000L) << 6; *cook |= (*raw0 & 0x00000fc0L) << 10; *cook |= (*raw1 & 0x00fc0000L) >> 10; *cook++ |= (*raw1 & 0x00000fc0L) >> 6; *cook = (*raw0 & 0x0003f000L) << 12; *cook |= (*raw0 & 0x0000003fL) << 16; *cook |= (*raw1 & 0x0003f000L) >> 4; *cook++ |= (*raw1 & 0x0000003fL); } return;}void scrunch(register unsigned char *outof, register unsigned long *into)
{ *into = (*outof++ & 0xffL) << 24; *into |= (*outof++ & 0xffL) << 16; *into |= (*outof++ & 0xffL) << 8; *into++ |= (*outof++ & 0xffL); *into = (*outof++ & 0xffL) << 24; *into |= (*outof++ & 0xffL) << 16; *into |= (*outof++ & 0xffL) << 8; *into++ |= (*outof & 0xffL); return;}void unscrun(register unsigned long *outof, register unsigned char *into)
{ *into++ = (unsigned char)((*outof >> 24) & 0xffL); *into++ = (unsigned char)((*outof >> 16) & 0xffL); *into++ = (unsigned char)((*outof >> 8) & 0xffL); *into++ = (unsigned char)( *outof++ & 0xffL); *into++ = (unsigned char)((*outof >> 24) & 0xffL); *into++ = (unsigned char)((*outof >> 16) & 0xffL); *into++ = (unsigned char)((*outof >> 8) & 0xffL); *into = (unsigned char)( *outof & 0xffL); return;}void desfunc(register unsigned long *block,register unsigned long *keys)
{ register unsigned long fval, work, right, leftt; register int round; leftt = block[0]; right = block[1]; work = ((leftt >> 4) ^ right) & 0x0f0f0f0fL; right ^= work; leftt ^= (work << 4); work = ((leftt >> 16) ^ right) & 0x0000ffffL; right ^= work; leftt ^= (work << 16); work = ((right >> 2) ^ leftt) & 0x33333333L; leftt ^= work; right ^= (work << 2); work = ((right >> 8) ^ leftt) & 0x00ff00ffL; leftt ^= work; right ^= (work << 8); right = ((right << 1) | ((right >>31) & 1L)) & 0xffffffffL; work = (leftt ^ right) & 0xaaaaaaaaL; leftt ^= work; right ^= work; leftt = ((leftt << 1) | ((leftt >> 31)&1L)) & 0xffffffffL; for (round = 0; round < 8; round++) { work = (right << 28) | (right >> 4); work ^= *keys++; fval = SP7[ work & 0x3fL]; fval |= SP5[(work >> 8) & 0x3fL]; fval |= SP3[(work >> 16) & 0x3fL]; fval |= SP1[(work >> 24) & 0x3fL]; work = right ^ *keys++; fval |= SP8[ work & 0x3fL]; fval |= SP6[(work >> 8) & 0x3fL]; fval |= SP4[(work >> 16) & 0x3fL]; fval |= SP2[(work >> 24) & 0x3fL]; leftt ^= fval; work = (leftt << 28) | (leftt >> 4); work ^= *keys++; fval = SP7[ work & 0x3fL]; fval |= SP5[(work >> 8) & 0x3fL]; fval |= SP3[(work >> 16) & 0x3fL]; fval |= SP1[(work >> 24) & 0x3fL]; work = leftt ^ *keys++; fval |= SP8[ work & 0x3fL]; fval |= SP6[(work >> 8) & 0x3fL]; fval |= SP4[(work >> 16) & 0x3fL]; fval |= SP2[(work >> 24) & 0x3fL]; right ^= fval; } right = (right << 31) | (right >> 1); work = (leftt ^ right) & 0xaaaaaaaaL; leftt ^= work; right ^= work; leftt = (leftt << 31) | (leftt >> 1); work = ((leftt >> 8) ^ right) & 0x00ff00ffL; right ^= work; leftt ^= (work << 8); work = ((leftt >> 2) ^ right) & 0x33333333L; right ^= work; leftt ^= (work << 2); work = ((right >> 16) ^ leftt) & 0x0000ffffL; leftt ^= work; right ^= (work << 16); work = ((right >> 4) ^ leftt) & 0x0f0f0f0fL; leftt ^= work; right ^= (work << 4); *block++ = right; *block = leftt; return;}/*****************************************************************
OPENCOMM_DesExpandEncKey : Expand Des Enc Key 扩展des加密密钥 Return value: 0 : Success other : failed Parameters: pbDesKey : 扩展前的DES密钥(8字节) input ulDesKeyLen : 扩展前的DES密钥长度 input pbDesEncKey : 扩展后的DES加密密钥(128字节) output *ulDesEncKeyLen : 扩展后的DES加密密钥长度 output*****************************************************************/unsigned long OPENCOMM_DesExpandEncKey( unsigned char *pbDesKey, unsigned long ulDesKeyLen, unsigned char *pbDesEncKey, unsigned long *ulDesEncKeyLen){ unsigned long kn[32], dough[32]; if (ulDesKeyLen != 8) return 0xEE20;deskey(pbDesKey, EN0, kn);
cookey(kn, dough); *ulDesEncKeyLen = DES_KEYBYTES; //32 long = 128 bytes memcpy(pbDesEncKey, dough, *ulDesEncKeyLen); return 0;}/*****************************************************************
OPENCOMM_DesExpandDecKey : Expand Des Dec Key 扩展des解密密钥 Return value: 0 : Success other : failed Parameters: pbDesKey : 扩展前的DES密钥(8字节) input ulDesKeyLen : 扩展前的DES密钥长度 input pbDesDecKey : 扩展后的DES解密密钥(128字节) output *ulDesDecKeyLen : 扩展后的DES解密密钥长度 output*****************************************************************/unsigned long OPENCOMM_DesExpandDecKey( unsigned char *pbDesKey, unsigned long ulDesKeyLen, unsigned char *pbDesDecKey, unsigned long *ulDesDecKeyLen){ unsigned long kn[32], dough[32]; if (ulDesKeyLen != 8) return 0xEE20;deskey(pbDesKey, DE1, kn);
cookey(kn, dough); *ulDesDecKeyLen = DES_KEYBYTES; //32 long = 128 bytes memcpy(pbDesDecKey, dough, *ulDesDecKeyLen); return 0;}/****************************************************************
OPENCOMM_DesEncRaw : Des算法加密小整块明文8字节 Return value: 0 : Success other : failed Parameters: pbDesEncKey : DES加密密钥 input ulDesEncKeyLen : DES加密密钥长度 input pbInData : 待加密的明文 input ulInDataLen : 待加密的明文长度 input pbOutData : 加密后的密文 output *ulOutDataLen : 加密后的密文长度 output*****************************************************************/unsigned long OPENCOMM_DesEncRaw( unsigned char *pbDesEncKey, unsigned long ulDesEncKeyLen, unsigned char *pbInData, unsigned long ulInDataLen, unsigned char *pbOutData, unsigned long *ulOutDataLen){ unsigned long work[2], ek[DES_KEYLONGS]; unsigned char cp[DES_BLOCKLEN];if (ulInDataLen != DES_BLOCKLEN)
return 0xEE20; if (ulDesEncKeyLen != DES_KEYBYTES) return 0xEE20;memcpy(cp, pbInData, DES_BLOCKLEN);
scrunch(cp,work); // 8 bytes -> 2 long memcpy(ek, pbDesEncKey, ulDesEncKeyLen); desfunc(work,ek); unscrun(work,cp); // 2 long -> 8 bytes memcpy(pbOutData, cp, DES_BLOCKLEN); *ulOutDataLen = DES_BLOCKLEN;return 0;
}/*****************************************************************
OPENCOMM_DesDecRaw : Des算法解密小整块密文8字节 Return value: 0 : Success other : failed Parameters: pbDesDecKey : DES解密密钥 input ulDesDecKeyLen : DES解密密钥长度 input pbInData : 待解密的密文 input ulInDataLen : 待解密的密文长度 input pbOutData : 解密后的明文 output *ulOutDataLen : 解密后的明文长度 output*****************************************************************/unsigned long OPENCOMM_DesDecRaw( unsigned char *pbDesDecKey, unsigned long ulDesDecKeyLen, unsigned char *pbInData, unsigned long ulInDataLen, unsigned char *pbOutData, unsigned long *ulOutDataLen){ unsigned long work[2], dk[DES_KEYLONGS]; unsigned char cp[DES_BLOCKLEN];if (ulInDataLen != DES_BLOCKLEN)
return 0xEE20; if (ulDesDecKeyLen != DES_KEYBYTES) return 0xEE20;memcpy(cp, pbInData, DES_BLOCKLEN);
scrunch(cp,work); // 8 bytes -> 2 long memcpy(dk, pbDesDecKey, ulDesDecKeyLen); desfunc(work,dk); unscrun(work,cp); // 2 long -> 8 bytes memcpy(pbOutData, cp, DES_BLOCKLEN);// des_enc(pbDesEncKey, pbInData, pbOutData); *ulOutDataLen = DES_BLOCKLEN;return 0;
}/********************* DES *********************/
int myic_DESEncrypt(
unsigned char *pDesKey, int nDesKeyLen, unsigned char *pInData, int nInDataLen, unsigned char *pOutData, int *pOutDataLen){ unsigned char DesKeyBuf[32]; unsigned char DesEncKeyBuf[128]; int EncKeyLen, KeyLen = 0; int retval = 0, loops, i; if(nInDataLen%8 != 0) return 0xEE20; if(nDesKeyLen != 8) return 0xEE20; KeyLen = nDesKeyLen; memcpy(DesKeyBuf, pDesKey, nDesKeyLen);retval = OPENCOMM_DesExpandEncKey(DesKeyBuf, KeyLen, DesEncKeyBuf, (unsigned long *)&EncKeyLen); if(retval != 0) return retval;
loops = nInDataLen/8;
for(i = 0; i < loops; i++) { retval = OPENCOMM_DesEncRaw(DesEncKeyBuf, EncKeyLen, pInData + i*8, 8, pOutData + i*8, (unsigned long *)pOutDataLen); if(retval != 0) return retval; } *pOutDataLen = nInDataLen; return retval;} int myic_DESDecrypt( unsigned char *pDesKey, int nDesKeyLen, unsigned char *pInData, int nInDataLen, unsigned char *pOutData, int *pOutDataLen){ unsigned char DesKeyBuf[32]; unsigned char DesDecKeyBuf[128]; int DecKeyLen, KeyLen = 0; int retval = 0, loops, i; if(nInDataLen%8 != 0) return 0xEE20; if(nDesKeyLen != 8) return 0xEE20; KeyLen = nDesKeyLen; memcpy(DesKeyBuf, pDesKey, nDesKeyLen);retval = OPENCOMM_DesExpandDecKey(DesKeyBuf, KeyLen,
DesDecKeyBuf, (unsigned long *)&DecKeyLen); if(retval != 0) return retval; loops = nInDataLen/8; for(i = 0; i < loops; i++) { retval = OPENCOMM_DesDecRaw(DesDecKeyBuf, DecKeyLen, pInData + i*8, 8, pOutData + i*8, (unsigned long *)pOutDataLen); if(retval != 0) return retval; } *pOutDataLen = nInDataLen; return retval;} //对称明文数据打padingvoid CW_dataPadAdd(int tag, unsigned char *date, unsigned int dateLen, unsigned char **padDate, unsigned int *padDateLen){ int i, padLen; unsigned char *pTmp = NULL; pTmp = (unsigned char *)malloc(dateLen+24); if (pTmp == NULL) { *padDate = NULL; return ; } memset(pTmp, 0, dateLen+24); memcpy(pTmp, date, dateLen); if (tag == 0) { padLen = 8 - dateLen % 8; for (i=0; i<padLen; i++) { pTmp[dateLen+i] = (char)padLen; } *padDateLen = dateLen + padLen; } else { padLen = 16 - dateLen % 16; for (i=0; i<padLen; i++) { pTmp[dateLen+i] = (char)padLen; } } *padDateLen = dateLen + padLen; *padDate = pTmp;}#define USER_PASSWORD_KEY "abcd1234"
//数据加密int DesEnc( unsigned char *pInData, int nInDataLen, unsigned char *pOutData, int *pOutDataLen){ int rv; unsigned char *padDate = NULL; unsigned int padDateLen = 0;CW_dataPadAdd(0, pInData, (unsigned int )nInDataLen, &padDate, &padDateLen);
rv = myic_DESEncrypt((unsigned char *)USER_PASSWORD_KEY, strlen(USER_PASSWORD_KEY),
padDate, (int)padDateLen, pOutData, pOutDataLen); if (rv != 0) { if (padDate != NULL) { free(padDate); } return rv; }if (padDate != NULL)
{ free(padDate); } return 0;} //数据加密int DesEnc_raw( unsigned char *pInData, int nInDataLen, unsigned char *pOutData, int *pOutDataLen){ int rv; unsigned char *padDate = NULL; unsigned int padDateLen = 0;rv = myic_DESEncrypt((unsigned char *)USER_PASSWORD_KEY, strlen(USER_PASSWORD_KEY),
pInData, (int)nInDataLen, pOutData, pOutDataLen); if (rv != 0) { return rv; } return 0;}//解密分配内存错误
#define ERR_MALLOC 20//密码长度不是8的整数倍, 不合法#define ERR_FILECONT 20 //用户使用函数des解密int DesDec( unsigned char *pInData, int nInDataLen, unsigned char *pOutData, int *pOutDataLen){ int rv; char padChar; unsigned char *tmpPlain = NULL; tmpPlain = (unsigned char *)malloc(nInDataLen+24); if (tmpPlain == NULL) { return ERR_MALLOC; } memset(tmpPlain, 0, nInDataLen+24);//解密
rv = myic_DESDecrypt((unsigned char *)USER_PASSWORD_KEY, strlen(USER_PASSWORD_KEY), pInData, nInDataLen, tmpPlain, pOutDataLen); if (rv != 0) { if (tmpPlain != NULL) free(tmpPlain); return rv; }//去pading
padChar = tmpPlain[*pOutDataLen - 1]; if ( (int)padChar<=0 || (int)padChar>8) //异常处理 { if (tmpPlain) free(tmpPlain); return ERR_FILECONT; }*pOutDataLen = *pOutDataLen - (int)padChar;
//memset(tmpPlain + *pOutDataLen, 0, (int)padChar); memcpy(pOutData, tmpPlain, *pOutDataLen); if (tmpPlain) free(tmpPlain); return 0;} //用户使用函数des解密int DesDec_raw( unsigned char *pInData, int nInDataLen, unsigned char *pOutData, int *pOutDataLen){ int rv; //char padChar; //unsigned char *tmpPlain = NULL;/*
tmpPlain = (unsigned char *)malloc(nInDataLen+24); if (tmpPlain == NULL) { return ERR_MALLOC; } memset(tmpPlain, 0, nInDataLen+24); *///解密
rv = myic_DESDecrypt((unsigned char *)USER_PASSWORD_KEY, strlen(USER_PASSWORD_KEY), pInData, nInDataLen, pOutData, pOutDataLen); if (rv != 0) { //if (tmpPlain != NULL) free(tmpPlain); return rv; } /* //去pading padChar = tmpPlain[*pOutDataLen - 1]; if ( (int)padChar<=0 || (int)padChar>8) //异常处理 { if (tmpPlain) free(tmpPlain); return ERR_FILECONT; }*pOutDataLen = *pOutDataLen - (int)padChar;
//memset(tmpPlain + *pOutDataLen, 0, (int)padChar); memcpy(pOutData, tmpPlain, *pOutDataLen); if (tmpPlain) free(tmpPlain); */ return 0;}