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  • C加密解密

    /*********************************************************
     *  des.h
     *  用户使用des算法头文件
     *    
     *********************************************************/
    #ifndef _OPENDESS_H_
    #define _OPENDESS_H_
    
    #ifdef __cplusplus
    extern "C" {
    #endif
    
    //abdefg
    
    //用户使用的函数
    int DesEnc(
            unsigned char *pInData,//明文
            int            nInDataLen,
            unsigned char *pOutData,//密文
            int           *pOutDataLen);
    
    //用户使用函数des解密
    int DesDec(
           unsigned char *pInData,//密文
           int            nInDataLen,
           unsigned char *pOutData,//明文
           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    8
    
    typedef 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pading
    void  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;
    }
    #define  _CRT_SECURE_NO_WARNINGS 
    #include <stdlib.h>
    #include <string.h>
    #include <stdio.h>
    #include "des.h"
    
    int main11()
    {
        int        ret = 0;
        char *plain = "1232343444";//明文
        int plainlen = strlen(plain);
    
        char plain2[4096] = {0};//明文
        int plainlen2 = 0;
    
        unsigned char cryptbuf[4096] = {0};//密文
        int cryptlen = 0;
        //用户使用的函数
        ret =  DesEnc(plain, plainlen, cryptbuf, &cryptlen);
        if (ret != 0)
        {
            printf("func DesEnc() err:%d 
    ");
            return ret;
        }
    
        //用户使用函数des解密
        ret =   DesDec(cryptbuf, cryptlen,  plain2, &plainlen2);
        if (ret != 0)
        {
            printf("func DesDec() err:%d 
    ");
            return ret;
        }
    
        if (plainlen != plainlen2)
        {
            ret = -2;
            printf("明文长度和解密后的明文长度 不一样 
    ");
            return ret;
        }
    
        if (memcmp(plain2, plain, plainlen) == 0 )
        {
            printf("明文长度和解密后的明文长度 一样 ok 
    ");
        }
        else
        {
            printf("明文长度和解密后的明文长度 不一样 err 
    ");
        }
    
        system("pause");
        return ret ;
    }
    #define  _CRT_SECURE_NO_WARNINGS 
    #include <stdlib.h>
    #include <string.h>
    #include <stdio.h>
    #include "des.h"
    
    int FileSymEnc(const char *pfile1, const char *pfile2)//pfile1输入文件,
    {
        int        ret = 0;
        FILE *fp1= NULL, *fp2 = NULL;
        unsigned char plain[4096];
        int plainlen = 0;
    
        unsigned char cryptbuf[4096] = {0};
        int cryptlen = 0;
    
        int tmplen;
    
        fp1 = fopen(pfile1, "rb");//读的方式打开文件
        if (fp1 == NULL)
        {
            goto END;
        }
    
        fp2 = fopen(pfile2, "wb");//写的方式打开文件
        if (fp2 == NULL)
        {
            goto END;
        }
    
        while (!feof(fp1))//每次读取4k
        {
            plainlen = fread(plain, 1, 4096, fp1);//每次读取4k
            if (feof(fp1))  //读完数据以后,判断是否文件结束
            {
                break;//文件不足以4k,则跳出
            }
    
            //加密==4k的数据
            ret =  DesDec_raw(plain, plainlen, cryptbuf, &cryptlen);
            if (ret != 0)
            {
                printf("func DesEnc() err:%d 
    ", ret);
                goto END;
            }
    
            tmplen = fwrite(cryptbuf, 1, cryptlen, fp2);
            if (tmplen != cryptlen)//明文和密文的长度是一样的
            {
                ret  = -3;
                printf("写密文文件失败,请检查是否磁盘已满
    ");
                goto END;
            }
    
            //if (plainlen == 4096)
        }
    
        //加密小于4k的数据
        ret =  DesEnc(plain, plainlen, cryptbuf, &cryptlen);
        if (ret != 0)
        {
            printf("func DesEnc() err:%d 
    ", ret);
            goto END;
        }
    
        tmplen = fwrite(cryptbuf, 1, cryptlen, fp2);
        if (cryptlen != tmplen)//磁盘已满
        {
            ret  = -3;
            printf("写小于4k文件密文失败,请检查是否磁盘已满
    ");
            goto END;
        }
    
    END:
        if (fp1 != NULL)
        {
            fclose(fp1);
        }
        if (fp2 != NULL)
        {
            fclose(fp2);
        }
        return 0;
    }
    
    void main()
    {
        int        ret = 0;
        const char *file1 = "c:/socketclient.dll";
        const char *file2 = "c:/socketclientend.dll";
    
        //const char *file1 = "c:/22.txt";
        //const char *file2 = "c:/22enc.txt";
    
        ret =  FileSymEnc(file1, file2);
        if (ret != 0)
        {
            printf("func FileSymEnc() err
     " );
            return ;
        }
        
        system("pause");
        return ;
    }
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  • 原文地址:https://www.cnblogs.com/yaowen/p/4768236.html
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