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Copy pathdes.c
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594 lines (534 loc) · 17.1 KB
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// des.c : Data Encryption Standard
// 2013.3.22 v1.2
#include "des.h"
//字节转换成二进制
int ByteToBit(ElemType ch, ElemType bit[8]){
int cnt;
for(cnt = 0;cnt < 8; cnt++){
*(bit+cnt) = (ch>>cnt)&1;
}
return 0;
}
//二进制转换成字节
int BitToByte(ElemType bit[8],ElemType *ch){
int cnt;
for(cnt = 0;cnt < 8; cnt++){
*ch |= *(bit + cnt)<<cnt;
}
return 0;
}
//将长度为8的字符串转为二进制位串
int Char8ToBit64(ElemType ch[8],ElemType bit[64]){
int cnt;
for(cnt = 0; cnt < 8; cnt++){
ByteToBit(*(ch+cnt),bit+(cnt<<3));
}
return 0;
}
//将二进制位串转为长度为8的字符串
int Bit64ToChar8(ElemType bit[64],ElemType ch[8]){
int cnt;
memset(ch,0,8);
for(cnt = 0; cnt < 8; cnt++){
BitToByte(bit+(cnt<<3),ch+cnt);
}
return 0;
}
//生成子密钥
int DES_MakeSubKeys(ElemType key[64],ElemType subKeys[16][48]){
ElemType temp[56];
int cnt;
DES_PC1_Transform(key,temp);//PC1置换
for(cnt = 0; cnt < ROUND; cnt++){//16轮跌代，产生16个子密钥
DES_ROL(temp,MOVE_TIMES[cnt]);//循环左移
DES_PC2_Transform(temp,subKeys[cnt]);//PC2置换，产生子密钥
}
return 0;
}
//密钥置换1
int DES_PC1_Transform(ElemType key[64], ElemType tempbts[56]){
int cnt;
for(cnt = 0; cnt < 56; cnt++){
tempbts[cnt] = key[PC_1[cnt]];
}
return 0;
}
//密钥置换2
int DES_PC2_Transform(ElemType key[56], ElemType tempbts[48]){
int cnt;
for(cnt = 0; cnt < 48; cnt++){
tempbts[cnt] = key[PC_2[cnt]];
}
return 0;
}
//循环左移
int DES_ROL(ElemType data[56], int time){
ElemType temp[56];
//保存将要循环移动到右边的位
memcpy(temp,data,time);
memcpy(temp+time,data+28,time);
//前28位移动
memcpy(data,data+time,28-time);
memcpy(data+28-time,temp,time);
//后28位移动
memcpy(data+28,data+28+time,28-time);
memcpy(data+56-time,temp+time,time);
return 0;
}
//IP置换
int DES_IP_Transform(ElemType data[64]){
int cnt;
ElemType temp[64];
for(cnt = 0; cnt < 64; cnt++){
temp[cnt] = data[IP_Table[cnt]];
}
memcpy(data,temp,64);
return 0;
}
//IP逆置换
int DES_IP_1_Transform(ElemType data[64]){
int cnt;
ElemType temp[64];
for(cnt = 0; cnt < 64; cnt++){
temp[cnt] = data[IP_1_Table[cnt]];
}
memcpy(data,temp,64);
return 0;
}
//扩展置换
int DES_E_Transform(ElemType data[48]){
int cnt;
ElemType temp[48];
for(cnt = 0; cnt < 48; cnt++){
temp[cnt] = data[E_Table[cnt]];
}
memcpy(data,temp,48);
return 0;
}
//P置换
int DES_P_Transform(ElemType data[32]){
int cnt;
ElemType temp[32];
for(cnt = 0; cnt < 32; cnt++){
temp[cnt] = data[P_Table[cnt]];
}
memcpy(data,temp,32);
return 0;
}
//异或
int DES_XOR(ElemType R[48], ElemType L[48] ,int count){
int cnt;
for(cnt = 0; cnt < count; cnt++){
R[cnt] ^= L[cnt];
}
return 0;
}
//S盒置换
int DES_SBOX(ElemType data[48]){
int cnt;
int line,row,output;
int cur1,cur2;
for(cnt = 0; cnt < 8; cnt++){
cur1 = cnt*6;
cur2 = cnt<<2;
//计算在S盒中的行与列
line = (data[cur1]<<1) + data[cur1+5];
row = (data[cur1+1]<<3) + (data[cur1+2]<<2)
+ (data[cur1+3]<<1) + data[cur1+4];
output = S[cnt][line][row];
//化为2进制
data[cur2] = (output&0X08)>>3;
data[cur2+1] = (output&0X04)>>2;
data[cur2+2] = (output&0X02)>>1;
data[cur2+3] = output&0x01;
}
return 0;
}
//交换
int DES_Swap(ElemType left[32], ElemType right[32]){
ElemType temp[32];
memcpy(temp,left,32);
memcpy(left,right,32);
memcpy(right,temp,32);
return 0;
}
//加密单个分组
int DES_EncryptBlock(ElemType plainBlock[8], ElemType subKeys[16][48], ElemType cipherBlock[8]){
ElemType plainBits[64];
ElemType copyRight[48];
int cnt;
Char8ToBit64(plainBlock,plainBits);
//初始置换（IP置换）
DES_IP_Transform(plainBits);
//16轮迭代
for(cnt = 0; cnt < ROUND; cnt++){
memcpy(copyRight,plainBits+32,32);
//将右半部分进行扩展置换，从32位扩展到48位
DES_E_Transform(copyRight);
//将右半部分与子密钥进行异或操作
DES_XOR(copyRight,subKeys[cnt],48);
//异或结果进入S盒，输出32位结果
DES_SBOX(copyRight);
//P置换
DES_P_Transform(copyRight);
//将明文左半部分与右半部分进行异或
DES_XOR(plainBits,copyRight,32);
if(cnt != ROUND - 1){
//最终完成左右部的交换
DES_Swap(plainBits,plainBits+32);
}
}
//逆初始置换（IP^1置换）
DES_IP_1_Transform(plainBits);
Bit64ToChar8(plainBits,cipherBlock);
return 0;
}
//解密单个分组
int DES_DecryptBlock(ElemType cipherBlock[8], ElemType subKeys[16][48],ElemType plainBlock[8]){
ElemType cipherBits[64];
ElemType copyRight[48];
int cnt;
Char8ToBit64(cipherBlock,cipherBits);
//初始置换（IP置换）
DES_IP_Transform(cipherBits);
//16轮迭代
for(cnt = ROUND - 1; cnt >= 0; cnt--){
memcpy(copyRight,cipherBits+32,32);
//将右半部分进行扩展置换，从32位扩展到48位
DES_E_Transform(copyRight);
//将右半部分与子密钥进行异或操作
DES_XOR(copyRight,subKeys[cnt],48);
//异或结果进入S盒，输出32位结果
DES_SBOX(copyRight);
//P置换
DES_P_Transform(copyRight);
//将明文左半部分与右半部分进行异或
DES_XOR(cipherBits,copyRight,32);
if(cnt != 0){
//最终完成左右部的交换
DES_Swap(cipherBits,cipherBits+32);
}
}
//逆初始置换（IP^1置换）
DES_IP_1_Transform(cipherBits);
Bit64ToChar8(cipherBits,plainBlock);
return 0;
}
/*加密数据（字符串）
*plainBuffer:输入数据
*keyBuffer:密钥（8字节）
*cipherBuffer:输出数据
*n:加密数据长度
*/
int DES_Encrypt(ElemType *plainBuffer, ElemType *keyBuffer, ElemType *cipherBuffer, int n){
int des_size = n;
int des_count = 0;
int count = 0;
ElemType plainBlock[8],cipherBlock[8],keyBlock[8];
ElemType bKey[64];
ElemType subKeys[16][48];
//设置密钥
memcpy(keyBlock,keyBuffer,8);
//将密钥转换为二进制流
Char8ToBit64(keyBlock,bKey);
//生成子密钥
DES_MakeSubKeys(bKey,subKeys);
while (des_count + 8 <= des_size){
memcpy(plainBlock,plainBuffer + des_count,8);
DES_EncryptBlock(plainBlock,subKeys,cipherBlock);
memcpy(cipherBuffer + des_count,cipherBlock,8) ;
des_count += 8;
}
if((count = des_size - des_count)){
memcpy(plainBlock,plainBuffer + des_count,count);
//填充
memset(plainBlock + count,'\0',7 - count);
//最后一个字符保存包括最后一个字符在内的所填充的字符数量
plainBlock[7] = 8 - count;
DES_EncryptBlock(plainBlock,subKeys,cipherBlock);
memcpy(cipherBuffer + des_count,cipherBlock,8);
}
return DES_OK;
}
/*解密数据（字符串）
*cipherBuffer:输入数据
*keyBuffer:密钥（8字节）
*plainBuffer:输出数据
*n:解密数据长度
*返回解密后数据长度
*/
int DES_Decrypt(ElemType *cipherBuffer, ElemType *keyBuffer, ElemType *plainBuffer, int n){
int des_size = n;
int des_count = 0;
int count = 0;
ElemType plainBlock[8],cipherBlock[8],keyBlock[8];
ElemType bKey[64];
ElemType subKeys[16][48];
//设置密钥
memcpy(keyBlock,keyBuffer,8);
//将密钥转换为二进制流
Char8ToBit64(keyBlock,bKey);
//生成子密钥
DES_MakeSubKeys(bKey,subKeys);
while(1){
memcpy(cipherBlock,cipherBuffer + des_count,8);
DES_DecryptBlock(cipherBlock,subKeys,plainBlock);
if(des_count + 8 < des_size){
memcpy(plainBuffer + des_count,plainBlock,8);
des_count += 8;
} else {
break;
}
}
//判断末尾是否被填充
if(plainBlock[7] < 8){
for(count = 8 - plainBlock[7]; count < 7; count++){
if(plainBlock[count] != '\0'){
break;
}
}
}
if(count == 7){
memcpy(plainBuffer + des_count,plainBlock,8 - plainBlock[7]);
return des_count +8 - plainBlock[7];
} else {
memcpy(plainBuffer + des_count,plainBlock,8);
return des_count +8 ;
}
return des_count + 8;
}
//加密文件
int DES_Encrypt_File(char *plainFile, char *keyStr,char *cipherFile){
FILE *plain,*cipher,*key;
ElemType *plainBlock,*cipherBlock,keyBlock[8];
long fileLen_in,fileLen_out;
int count;
if((plain = fopen(plainFile,"rb")) == NULL){
return PLAIN_FILE_OPEN_ERROR;
}
if((key = fopen(keyStr,"rb")) == NULL){
return KEY_FILE_OPEN_ERROR;
}
if((cipher = fopen(cipherFile,"wb")) == NULL){
return CIPHER_FILE_OPEN_ERROR;
}
if((count = fread(keyBlock,sizeof(char),8,key)) == 8){
}
fseek(plain,0,SEEK_END);//将文件指针置尾
fileLen_out = fileLen_in = ftell(plain);//取文件指针当前位置
rewind(plain);//将文件指针重指向文件头
if (fileLen_in % 8 != 0)
fileLen_out = (fileLen_in/8+1)*8;
plainBlock = (ElemType *)malloc(fileLen_out * sizeof(ElemType));
cipherBlock = (ElemType *)malloc(fileLen_out * sizeof(ElemType));
fread(plainBlock,sizeof(char),fileLen_in,plain);
DES_Encrypt(plainBlock,keyBlock,cipherBlock,fileLen_in);
fwrite(cipherBlock,sizeof(char),fileLen_out,cipher);
fclose(plain);
fclose(cipher);
fclose(key);
free(plainBlock);
free(cipherBlock);
return DES_OK;
}
//解密文件
int DES_Decrypt_File(char *cipherFile, char *keyStr,char *plainFile){
FILE *plain,*cipher,*key;
ElemType *plainBlock,*cipherBlock,keyBlock[8];
int count;
long fileLen_in,fileLen_out;
if((plain = fopen(plainFile,"wb")) == NULL){
return PLAIN_FILE_OPEN_ERROR;
}
if((key = fopen(keyStr,"rb")) == NULL){
return KEY_FILE_OPEN_ERROR;
}
if((cipher = fopen(cipherFile,"rb")) == NULL){
return CIPHER_FILE_OPEN_ERROR;
}
if((count = fread(keyBlock,sizeof(char),8,key)) == 8){
}
fseek(cipher,0,SEEK_END);//将文件指针置尾
fileLen_out = fileLen_in = ftell(cipher);//取文件指针当前位置
rewind(cipher);//将文件指针重指向文件头
plainBlock = (ElemType *)malloc(fileLen_in * sizeof(ElemType));
cipherBlock = (ElemType *)malloc(fileLen_in * sizeof(ElemType));
fread(cipherBlock,sizeof(char),fileLen_in,cipher);
count = DES_Decrypt(cipherBlock,keyBlock,plainBlock,fileLen_in);
fwrite(plainBlock,sizeof(char),count,plain);
fclose(plain);
fclose(cipher);
fclose(key);
free(plainBlock);
free(cipherBlock);
return DES_OK;
}
/*3DES加密数据（字符串）
*对区块使用3个64位密钥进行3次加密，相当于增加了密钥长度
*plainBuffer:输入数据
*keyBuffer:密钥（24字节）
*cipherBuffer:输出数据
*n:加密数据长度
*/
int D3DES_Encrypt(ElemType *plainBuffer, ElemType *keyBuffer, ElemType *cipherBuffer, int n){
int des_size = n;
int des_count = 0;
int count = 0;
int i;
ElemType plainBlock[8],cipherBlock[8],keyBlock[24];
ElemType bKey[3][64];
ElemType subKeys[3][16][48];
for (i = 0; i < 3 ; i++)
{
//设置密钥
memcpy(keyBlock+i*8,keyBuffer+i*8,8);
//将密钥转换为二进制流
Char8ToBit64(keyBlock+i*8,bKey[i]);
//生成子密钥
DES_MakeSubKeys(bKey[i],subKeys[i]);
}
while (des_count + 8 <= des_size){
memcpy(plainBlock,plainBuffer + des_count,8);
for (i = 0; i < 3 ; i++)
{
DES_EncryptBlock(plainBlock,subKeys[i],cipherBlock);
}
memcpy(cipherBuffer + des_count,cipherBlock,8) ;
des_count += 8;
}
if((count = des_size - des_count)){
memcpy(plainBlock,plainBuffer + des_count,count);
//填充
memset(plainBlock + count,'\0',7 - count);
//最后一个字符保存包括最后一个字符在内的所填充的字符数量
plainBlock[7] = 8 - count;
{
for (i = 0; i < 3 ; i++)
{
DES_EncryptBlock(plainBlock,subKeys[i],cipherBlock);
}
}
memcpy(cipherBuffer + des_count,cipherBlock,8);
}
return DES_OK;
}
/*3DES解密数据（字符串）
*cipherBuffer:输入数据
*keyBuffer:密钥（24字节）
*plainBuffer:输出数据
*n:解密数据长度
*返回解密后数据长度
*/
int D3DES_Decrypt(ElemType *cipherBuffer, ElemType *keyBuffer, ElemType *plainBuffer, int n){
int des_size = n;
int des_count = 0;
int count = 0;
int i;
ElemType plainBlock[8],cipherBlock[8],keyBlock[24];
ElemType bKey[3][64];
ElemType subKeys[3][16][48];
for (i = 0; i < 3 ; i++)
{
//设置密钥
memcpy(keyBlock+i*8,keyBuffer+i*8,8);
//将密钥转换为二进制流
Char8ToBit64(keyBlock+i*8,bKey[i]);
//生成子密钥
DES_MakeSubKeys(bKey[i],subKeys[i]);
}
while(1){
memcpy(cipherBlock,cipherBuffer + des_count,8);
for (i = 0; i < 3 ; i++)
{
DES_DecryptBlock(cipherBlock,subKeys[i],plainBlock);
}
if(des_count + 8 < des_size){
memcpy(plainBuffer + des_count,plainBlock,8);
des_count += 8;
} else {
break;
}
}
//判断末尾是否被填充
if(plainBlock[7] < 8){
for(count = 8 - plainBlock[7]; count < 7; count++){
if(plainBlock[count] != '\0'){
break;
}
}
}
if(count == 7){
memcpy(plainBuffer + des_count,plainBlock,8 - plainBlock[7]);
return des_count +8 - plainBlock[7];
} else {
memcpy(plainBuffer + des_count,plainBlock,8);
return des_count +8 ;
}
return des_count + 8;
}
//3DES加密文件
int D3DES_Encrypt_File(char *plainFile, char *keyStr,char *cipherFile){
FILE *plain,*cipher,*key;
ElemType *plainBlock,*cipherBlock,keyBlock[24];
long fileLen_in,fileLen_out;
int count;
if((plain = fopen(plainFile,"rb")) == NULL){
return PLAIN_FILE_OPEN_ERROR;
}
if((key = fopen(keyStr,"rb")) == NULL){
return KEY_FILE_OPEN_ERROR;
}
if((cipher = fopen(cipherFile,"wb")) == NULL){
return CIPHER_FILE_OPEN_ERROR;
}
if((count = fread(keyBlock,sizeof(char),24,key)) == 24){
}
fseek(plain,0,SEEK_END);//将文件指针置尾
fileLen_out = fileLen_in = ftell(plain);//取文件指针当前位置
rewind(plain);//将文件指针重指向文件头
if (fileLen_in % 8 != 0)
fileLen_out = (fileLen_in/8+1)*8;
plainBlock = (ElemType *)malloc(fileLen_out * sizeof(ElemType));
cipherBlock = (ElemType *)malloc(fileLen_out * sizeof(ElemType));
fread(plainBlock,sizeof(char),fileLen_in,plain);
D3DES_Encrypt(plainBlock,keyBlock,cipherBlock,fileLen_in);
fwrite(cipherBlock,sizeof(char),fileLen_out,cipher);
fclose(plain);
fclose(cipher);
fclose(key);
free(plainBlock);
free(cipherBlock);
return DES_OK;
}
//3DES解密文件
int D3DES_Decrypt_File(char *cipherFile, char *keyStr,char *plainFile){
FILE *plain,*cipher,*key;
ElemType *plainBlock,*cipherBlock,keyBlock[24];
int count;
long fileLen_in,fileLen_out;
if((plain = fopen(plainFile,"wb")) == NULL){
return PLAIN_FILE_OPEN_ERROR;
}
if((key = fopen(keyStr,"rb")) == NULL){
return KEY_FILE_OPEN_ERROR;
}
if((cipher = fopen(cipherFile,"rb")) == NULL){
return CIPHER_FILE_OPEN_ERROR;
}
if((count = fread(keyBlock,sizeof(char),24,key)) == 24){
}
fseek(cipher,0,SEEK_END);//将文件指针置尾
fileLen_out = fileLen_in = ftell(cipher);//取文件指针当前位置
rewind(cipher);//将文件指针重指向文件头
plainBlock = (ElemType *)malloc(fileLen_in * sizeof(ElemType));
cipherBlock = (ElemType *)malloc(fileLen_in * sizeof(ElemType));
fread(cipherBlock,sizeof(char),fileLen_in,cipher);
count = D3DES_Decrypt(cipherBlock,keyBlock,plainBlock,fileLen_in);
fwrite(plainBlock,sizeof(char),count,plain);
fclose(plain);
fclose(cipher);
fclose(key);
free(plainBlock);
free(cipherBlock);
return DES_OK;
}