des加密程序(头文件)

〖Encrypt〗
 
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  发信人: say (实话实说), 信区: Encrypt
标  题: des加密程序(头文件)
发信站: 武汉白云黄鹤站 (Thu Jan 27 17:06:39 2000), 转信

#ifndef __DES_H
#define __DES_H
#include <stdio.h>
#include <assert.h>
/******************************************************
*
*  This is a part of article from tsinghua bbs
*  I Change it to C language
*******************************************************/
        // Encrypt/decrypt the data in \"data\", according to the \"key\".
        // Caller is responsible for confirming the buffer size of \"data\"
        // points to is 8*\"blocks\" bytes.
        // The data encrypted/decrypted is stored in data.
        // The return code is 1:success, other:failed.
        int encrypt ( char key[8], char* data, int blocks  );
        int decrypt ( char key[8], char* data, int blocks  );

        // Encrypt/decrypt any size data,according to a special method.
        // Before calling yencrypt, copy data to a new buffer with size
        // calculated by extend.
        int yencrypt ( char key[8], char* data, int size );
        int ydecrypt2 ( char key[8], char* in, int blocks, int* size );

        int extend ( int size );

        void des(unsigned char* in, unsigned char* out, int blocks);
        void des_block(unsigned char* in, unsigned char* out);

        //unsigned long KnL[32];
        enum Mode { ENCRYPT, DECRYPT };
        void deskey(unsigned char key[8], enum Mode md );
        void usekey(unsigned long *);
        void cookey(unsigned long *);

        void scrunch(unsigned char *, unsigned long *);
        void unscrun(unsigned long *, unsigned char *);
        void desfunc(unsigned long *, unsigned long *);
   /*
        static unsigned char Df_Key[24];
        static unsigned short bytebit[8];
        static unsigned long bigbyte[24];
        static unsigned char pc1[56];
        static unsigned char totrot[16];
        static unsigned char pc2[48];
        static unsigned long SP1[64];
        static unsigned long SP2[64];
        static unsigned long SP3[64];
        static unsigned long SP4[64];
        static unsigned long SP5[64];
        static unsigned long SP6[64];
        static unsigned long SP7[64];
        static unsigned long SP8[64];
*/

#endif

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※ 来源:．武汉白云黄鹤站 bbs.whnet.edu.cn．[FROM: 202.116.9.52]


 
 
 
  
 
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