DES.rar_des_triple DES

#include<iostream> #include"des.h" #include"permutation.h" using namespace std; bool key_56[57]; bool key_48[49]; bool text_64[65]; bool text_48[49]; bool text_32[33]; void _copy( bool* from, bool* to, int size ); void display( bool* b, int size ) { for( int i = 1; i<=size; i++ ) { cout<<b[i]; } } //将64位明文作初始置换 void ini_per() { bool temp[TEXT_L+1]; for( int i = 1; i<=TEXT_L; i++ ) { temp[ i ] = text_64[ IP[i] ]; } for( int i = 1; i<=TEXT_L; i++ ) { text_64[i] = temp[i]; } } //密钥置换 void key_per() { bool temp[KEY_L+1]; for( int i = 1; i<=KEY_L; i++ ) { temp[ i ] = key_56[ KP[i]-KP[i]/8 ]; //cout<<KP[i]-KP[i]/8 <<endl; } for( int i = 1; i<=KEY_L; i++ ) { key_56[i] = temp[i]; } } //左28位密码左移一位 void lkey_lshift( ) { bool temp = key_56[1]; for( int i = 2; i <= KEY_L/2; i++ ) { key_56[i-1] = key_56[i]; } key_56[KEY_L/2] = temp; } //左28位密码右移一位 void lkey_rshift() { bool temp = key_56[KEY_L/2]; for( int i = KEY_L/2; i >= 2; i-- ) { key_56[i] = key_56[i-1]; } key_56[1] = temp; } //右28位密码左移一位 void rkey_lshift( ) { bool temp = key_56[29]; for( int i = 30; i <= KEY_L; i++ ) { key_56[i-1] = key_56[i]; } key_56[KEY_L] = temp; //display(key_56+28, 28); //cout<<endl; //system("pause"); } //右28位密码右移一位 void rkey_rshift() { bool temp = key_56[KEY_L]; for( int i = KEY_L; i >= KEY_L/2+2; i-- ) { key_56[i] = key_56[i-1]; } key_56[KEY_L/2+1] = temp; /*display(key_56+28, 28); cout<<endl;*/ } //加密过程中第n轮密钥移位 void encrypt_key_shift( int n ) { for( int i = 0; i<KS[n]; i++ ) { lkey_lshift(); rkey_lshift(); } //cout<<n<<": "; //display( key_56, 56 ); //cout<<endl; } //解密过程中第n轮密钥移位 void decrypt_key_shift( int n ) { if( n == 1 ) return; for( int i = 0; i<KS[n]; i++ ) { lkey_rshift(); rkey_rshift(); } //cout<<n<<": "; //display( key_56, 56 ); //cout<<endl; } //密码压缩置换 void key_comp() { for( int i = 1; i<=COMMON_L; i++ ) { key_48[i] = key_56[ KCP[i] ]; } } //加密过程中，得到第n轮密钥，保存在key_48数组中 void encrypt_get_key( int n ) { //key_per(); encrypt_key_shift(n); key_comp(); //cout<<n<<": "; //display( key_48, 48 ); //cout<<endl; } //解密过程中，得到第n轮密钥，保存在key_48数组中 void decrypt_get_key( int n ) { //key_per(); decrypt_key_shift(n); key_comp(); //cout<<n<<": "; //display( key_48, 48 ); //cout<<endl; } //扩展置换，将数据的右半部分从32位扩展为48位，结果保存在text_48中 void text_expan() { for( int i = 1; i<= COMMON_L; i++ ) { text_48[i] = text_64[ EBOX[i] + 32 ]; } } //将text_48与key_48异或，结果保存在明文数组中 void exclusive() { for( int i = 1; i<COMMON_L; i++) { text_48[i] = ((key_48[i] == text_48[i]) ? 0 : 1); } } //s盒置换，由text_48的48位生成32位，保存在text_64的右32位 void s_box_per() { for( int i = 0; i<8; i++ ) { //取相应的位置的数 bool* temp1 = text_48+(i*6)+1; int r = temp1[0]*2 + temp1[5]; int c = temp1[1]*8 + temp1[2]*4 + temp1[3]*2 + temp1[4]; int res = SBOX[i][(r-1)*16+(c-1)]; //将结果填text_64的右32位 bool* temp2 = &text_64[TEXT_L/2+1] + (i*4); temp2[3] = bool( res%2 ); temp2[2] = bool( (res/2)%2 ); temp2[1] = bool( (res/4)%2 ); temp2[0] = bool( res/8 ); } } //P盒置换 void p_per() { bool temp[33]; for( int i = 1; i<=32; i++ ) { temp[i] = text_64[ PBOX[i] +32 ]; } for( int i = 1; i<= 32; i++ ) { text_64[i+32] = temp[i]; } } //左32位与右32位异或，结果保存在左32位中 void exclusiveLR() { for( int i = 1; i<=32; i++ ) { text_64[i] = ((text_64[i+32] == text_64[i]) ? 0 : 1); } } //交换左右32位 void swap() { for( int i = 1; i<=32; i++ ) { bool t = text_64[i+32]; text_64[i+32] = text_64[i]; text_64[i] = t; } } //加密过程中第n轮置换 void encrypt_per( int n ) { _copy( text_64 + 33, text_32+1, 32 ); encrypt_get_key(n); text_expan(); exclusive(); s_box_per(); p_per(); exclusiveLR(); _copy( text_32+1, text_64+33, 32 ); if( n != 16 ) { swap(); } } //解密过程中第n轮置换 void decrypt_per( int n ) { _copy( text_64 + 33, text_32+1, 32 ); decrypt_get_key(n); text_expan(); exclusive(); s_box_per(); p_per(); exclusiveLR(); _copy( text_32+1, text_64+33, 32 ); if( n != 16 ) { swap(); } } //末置换 void end_per() { bool temp[TEXT_L+1]; for( int i = 1; i<=TEXT_L; i++ ) { temp[ i ] = text_64[ EP[i] ]; } for( int i = 0; i<TEXT_L; i++ ) { text_64[i] = temp[i]; } } //DES加密过程 void encrypt() { //ini_per(); for( int i = 1; i<=16; i++ ) { encrypt_per(i); } //end_per(); } //DES解密过程 void decrypt() { //end_per(); for( int i = 1; i<=16; i++ ) { decrypt_per(i); } //ini_per(); } void _copy( bool* from, bool* to, int size ) { for( int i = 0; i<size; i++ ) { to[i] = from[i]; } } //des一轮加密过程 //输入参数：plain 保存明文的bool数组指针 //输入参数：key 保存密钥的bool数组指针 //输出参数：cypher 输出加密后的密文 void des_encrypt( bool* plain, bool* cypher, bool* key ) { _copy( plain, text_64, 65 ); _copy( key, key_56, 57 ); encrypt(); _copy( text_64, cypher, 65); } //des一轮解密过程 //输入参数：cypher 保存密文的bool数组指针 //输入参数：key 保存密钥的bool数组指针 //输出参数：plain 输出解密后的明文 void des_decrypt( bool* plain, bool* cypher, bool* key ) { _copy( cypher, text_64, 65 ); _copy( key, key_56, 57 ); decrypt(); _copy( text_64, plain, 65); }