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c语言实现DES加密解密
#include "des.h"
//移位表
static Table_size const shiftTable[NumberOfKeys] = {1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1};
//E扩展表
static Table_size const eTable[des_key_pc2_standard]={
32, 1, 2, 3, 4, 5,
4, 5, 6, 7, 8, 9,
8, 9, 10, 11, 12, 13,
12, 13, 14, 15, 16, 17,
16, 17, 18, 19, 20, 21,
20, 21, 22, 23, 24, 25,
24, 25, 26, 27, 28, 29,
28, 29, 30, 31, 32, 1
};
//P置换表
static Table_size const pTable[des_data_rl]={
16, 7,20,21,29,12,28,17,
1,15,23,26, 5,18,31,10,
2, 8,24,14,32,27, 3, 9,
19,13,30, 6,22,11, 4,25
};
//数据初始置换表
static Table_size const ip0Table[des_standard] = {
58, 50, 42, 34, 26, 18, 10, 2,
60, 52, 44, 36, 28, 20, 12, 4,
62, 54, 46, 38, 30, 22, 14, 6,
64, 56, 48, 40, 32, 24, 16, 8,
57, 49, 41, 33, 25, 17, 9, 1,
59, 51, 43, 35, 27, 19, 11, 3,
61, 53, 45, 37, 29, 21, 13, 5,
63, 55, 47, 39, 31, 23, 15, 7
};
//ip1表
static Table_size const ip1Table[des_standard]={
40, 8,48,16,56,24,64,32,
39, 7,47,15,55,23,63,31,
38, 6,46,14,54,22,62,30,
37, 5,45,13,53,21,61,29,
36, 4,44,12,52,20,60,28,
35, 3,43,11,51,19,59,27,
34, 2,42,10,50,18,58,26,
33, 1,41, 9,49,17,57,25
};
//子密钥pc1置换表
static Table_size const desSubkeyPc1[des_key_pc1_standard] = {
57, 49, 41, 33, 25, 17, 9,
1, 58, 50, 42, 34, 26, 18,
10, 2, 59, 51, 43, 35, 27,
19, 11, 3, 60, 52, 44, 36,
63, 55, 47, 39, 31, 23, 15,
7, 62, 54, 46, 38, 30, 22,
14, 6, 61, 53, 45, 37, 29,
21, 13, 5, 28, 20, 12, 4
};
//子密钥pc2置换表
static Table_size const desSubkeyPc2[des_key_pc2_standard]={
14, 17, 11, 24, 1, 5, 3, 28,
15, 6, 21, 10, 23, 19, 12, 4,
26, 8, 16, 7, 27, 20, 13, 2,
41, 52, 31, 37, 47, 55, 30, 40,
51, 34, 33, 48, 44, 49, 39, 56,
34, 53, 46, 42, 50, 36, 29, 32
};
//S盒表
static Table_size const sBoxTable[8][4][16]={
//S1
14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,
0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,
4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,
15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13,
//S2
15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,
0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,
13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9,
//S3
10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,
13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,
13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,
1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12,
//S4
7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,
13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,
10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,
3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14,
//S5
2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,
14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,
4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,
11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3,
//S6
12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,
10, 15, 4, 2, 7, 12, 0, 5, 6, 1, 13, 14, 0, 11, 3, 8,
9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,
4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13,
//S7
4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,
13, 0, 11, 7, 4, 0, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,
1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,
6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12,
//S8
13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,
1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,
7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,
2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11
};
/*
* 函数功能:生成16个6字节子密钥
* 参数:<key>传入8字节密钥,<key_lenght>密钥长度必须是8字节
* 返回值:返回16*(48/8)字节大小的16个子密钥
* 注释:返回值要释放
*/
subkey_size __desSubKeyGeneration(subkey_size key, data_lenght_size key_lenght)
{
//如果传入空或长度不为8字节则返回空
if(key==NULL || key_lenght!=8)
return NULL;
//申请堆内存
subkey_size subkey16 = (subkey_size)malloc(NumberOfKeys * (des_key_pc2_standard / systemBit));
//清空初始化,按照申请内存大小来清空这块堆内存
memset(subkey16, 0, NumberOfKeys * (des_key_pc2_standard / systemBit));
//创建布尔型的数组,让移位代码实现更简单
int count = 0;
bool tmp = 0;
bool bit_table_pc1[des_key_pc1_standard]={0}; //pc1的56位数据
bool bit_table[des_standard]={0}; //64位数据
//将数据赋值到布尔型数组里面
for(int i=0; i<des_standard; i++)
bit_table[i] = BIT_JUDGE(*(key + i / systemBit), (i % systemBit));
//进行PC1转换
for(int i=0; i<des_key_pc1_standard; i++)
bit_table_pc1[i] = bit_table[desSubkeyPc1[i]-1];
//进行十六次密钥生成
for(int num=0; num<NumberOfKeys; num++)
{
//保存移位次数
count = shiftTable[num];
//进行移位
while(count--)
{
//前二十八位移位
tmp = bit_table_pc1[0];
for(int i=0; i<28; i++)
bit_table_pc1[i]=bit_table_pc1[i+1];
bit_table_pc1[27]=tmp;
//后二十八位移位
tmp = bit_table_pc1[28];
for(int i=28; i<56; i++)
bit_table_pc1[i]=bit_table_pc1[i+1];
bit_table_pc1[55]=tmp;
}
//进行判断写入新的数据
for(int i=0; i<des_key_pc2_standard; i++)
{
if(bit_table_pc1[desSubkeyPc2[i]-1])
SET_BIT_NUMBER(*(subkey16 + (num * (des_key_pc2_standard / systemBit)) + (i / systemBit)), (i % systemBit));
else RESET_BIT_NUMBER(*(subkey16 + (num * (des_key_pc2_standard / systemBit)) + (i / systemBit)), (i % systemBit));
}
}
//返回子密钥
return subkey16;
}
/*
* 函数功能:进行数据加密
* 参数:<data>传入8整数倍字节数据,<data_lenght>数据长度,<key>16*(48/8)字节大小的16个子密钥,<key_lenght>必须是6*16长度
* 返回值:返回加密后的数据
* 注释:返回值要释放
*/
data_size __desDataEncryption(data_size data, data_lenght_size data_lenght, subkey_size key, data_lenght_size key_lenght)
{
//如果传入空或长度不为8字节则返回空
if(key==NULL || key_lenght!=(NumberOfKeys*(des_key_pc2_standard/systemBit)) || data==NULL || data_lenght!=8)
return NULL;
//申请堆内存
data_size Data16 = (data_size)malloc(des_standard/8);
//清空初始化,按照申请内存大小来清空这块堆内存
memset(Data16, 0, (des_standard/8));
//创建一个布尔型的数组,将移位操作变得简单
bool bit_table[des_standard]={0}; //64位数据
bool data64_table[des_standard]={0}; //64位数据
bool extend48_table[des_key_pc2_standard]={0}; //pc2表的48位数据
bool dataL32_table[des_data_rl]={0}; //64位数据的左32
bool dataR32_table[des_data_rl]={0}; //64位数据的右32
bool tmpL32_table[des_data_rl]={0}; //临时64位数据的左32
bool tmpR32_table[des_data_rl]={0}; //临时64位数据的右32
//将数据赋值到布尔型数组里面
for(int i=0; i<des_standard; i++)
bit_table[i] = BIT_JUDGE(*(data + (i / systemBit)), (i % systemBit));
//进行初始置换
for(int i=0; i<des_standard; i++)
data64_table[i] = bit_table[ip0Table[i]-1];
//将64位一分为二
for(int i=0; i<des_data_rl; i++)
dataL32_table[i] = data64_table[i];
for(int i=0; i<des_data_rl; i++)
dataR32_table[i] = data64_table[i+32];
// 列 行
int row=0, col=0;
//进行十六次轮函数
for(int num=0; num<NumberOfKeys; num++)
{
//将R数组赋值给L的临时数组
for(int i=0; i<des_data_rl; i++)
tmpL32_table[i] = dataR32_table[i];
//将R数组进行E扩展
for(int i=0; i<des_key_pc2_standard; i++)
extend48_table[i] = dataR32_table[(eTable[i]-1)];
//将E扩展后48位和子密钥进行异或
for(int i=0; i<des_key_pc2_standard; i++)
extend48_table[i] = extend48_table[i] ^ (BIT_JUDGE(*(key + (num * (des_key_pc2_standard / systemBit)) + i / systemBit), (i % systemBit)));
//将48位转换成32位
for(int j=0; j<des_key_pc2_standard; j+=6)
{
//计算出行列
row = extend48_table[j+0]*2 + extend48_table[j+5]*1;
col = extend48_table[j+1]*8 + extend48_table[j+2]*4 + extend48_table[j+3]*2 + extend48_table[j+4]*1;
//进行查表,并将10进制转换为四位二进制
for(int i=0; i<4; i++)
dataR32_table[((j/6)*4)+i] = BIT_JUDGE(sBoxTable[j/6][row][col], i);
}
//将R进行转换并存入R临时数组
for(int i=0; i<des_data_rl; i++)
tmpR32_table[i] = dataR32_table[pTable[i]-1];
//在用临时数组进行异或
for(int i=0; i<des_data_rl; i++)
{
dataR32_table[i] = (dataL32_table[i] ^ tmpR32_table[i]);
}
//最后将刚才的L临时数组赋值
for(int i=0; i<des_data_rl; i++)
dataL32_table[i] = tmpL32_table[i];
}
//将两个32位进行拼接
for(int i=0; i<des_data_rl; i++)
data64_table[i] = dataL32_table[i];
for(int i=des_data_rl; i<des_standard; i++)
data64_table[i] = dataR32_table[i-32];
//进行判断写入新的数据
for(int i=0; i<des_standard; i++)
{
if(data64_table[ip1Table[i]-1])
SET_BIT_NUMBER(*(Data16 + (i / systemBit)), (i % systemBit));
else RESET_BIT_NUMBER(*(Data16 + (i / systemBit)), (i % systemBit));
}
//返回数据
return Data16;
}
/*
* 函数功能:进行数据解密
* 参数:<data>传入加密后数据,<data_lenght>加密后数据长度,<key>16*(48/8)字节大小的16个子密钥,<key_lenght>必须是6*16长度
* 返回值:返回解密后的数据
* 注释:返回值要释放
*/
data_size __desDataDecrypt(data_size data, data_lenght_size data_lenght, subkey_size key, data_lenght_size key_lenght)
{
//如果传入空或长度不为8字节则返回空
if(key==NULL || key_lenght!=(NumberOfKeys*(des_key_pc2_standard/systemBit)) || data==NULL || data_lenght!=8)
return NULL;
//申请堆内存
data_size Data16 = (data_size)malloc(des_standard/8);
//清空初始化,按照申请内存大小来清空这块堆内存
memset(Data16, 0, (des_standard/8));
//创建一堆布尔型的数组,将移位操作变得简单
bool bit_table[des_standard]={0}; //64位数据
bool data64_table[des_standard]={0}; //64位数据
bool extend48_table[des_key_pc2_standard]={0}; //pc2表48位数据
bool dataL32_table[des_data_rl]={0}; //64位数据的左32位
bool dataR32_table[des_data_rl]={0}; //64位数据的右32位
bool tmpL32_table[des_data_rl]={0}; //临时64位数据的左32位
bool tmpR32_table[des_data_rl]={0}; //临时64位数据的右32位
//将数据赋值到布尔型数组里面
for(int i=0; i<des_standard; i++)
bit_table[i] = BIT_JUDGE(*(data + (i / systemBit)), (i % systemBit));
//进行初始置换
for(int i=0; i<des_standard; i++)
data64_table[i] = bit_table[ip0Table[i]-1];
//将64位一分为二
for(int i=0; i<des_data_rl; i++)
dataR32_table[i] = data64_table[i];
for(int i=0; i<des_data_rl; i++)
dataL32_table[i] = data64_table[i+32];
// 列 行
int row=0, col=0;
//进行十六次轮函数(反着来)
for(int num=(NumberOfKeys-1); num>=0; num--)
{
//将R数组赋值给L的临时数组
for(int i=0; i<des_data_rl; i++)
tmpL32_table[i] = dataR32_table[i];
//将R数组进行E扩展
for(int i=0; i<des_key_pc2_standard; i++)
extend48_table[i] = dataR32_table[(eTable[i]-1)];
//将E扩展后48位和子密钥进行异或
for(int i=0; i<des_key_pc2_standard; i++)
extend48_table[i] = extend48_table[i] ^ (BIT_JUDGE(*(key + (num * (des_key_pc2_standard / systemBit)) + i / systemBit), (i % systemBit)));
//将48位转换成32位
for(int j=0; j<des_key_pc2_standard; j+=6)
{
//计算出行列
row = extend48_table[j+0]*2 + extend48_table[j+5]*1;
col = extend48_table[j+1]*8 + extend48_table[j+2]*4 + extend48_table[j+3]*2 + extend48_table[j+4]*1;
//进行查表,并将10进制转换为四位二进制
for(int i=0; i<4; i++)
dataR32_table[((j/6)*4)+i] = BIT_JUDGE(sBoxTable[j/6][row][col], i);
}
//将R进行转换并存入R临时数组
for(int i=0; i<des_data_rl; i++)
tmpR32_table[i] = dataR32_table[pTable[i]-1];
//在用临时数组进行异或
for(int i=0; i<des_data_rl; i++)
{
dataR32_table[i] = (dataL32_table[i] ^ tmpR32_table[i]);
}
//最后将刚才的L临时数组赋值
for(int i=0; i<des_data_rl; i++)
dataL32_table[i] = tmpL32_table[i];
}
//将两个32位进行拼接
for(int i=0; i<des_data_rl; i++)
data64_table[i] = dataR32_table[i];
for(int i=des_data_rl; i<des_standard; i++)
data64_table[i] = dataL32_table[i-32];
//进行判断写入新的数据
for(int i=0; i<des_standard; i++)
{
if(data64_table[ip1Table[i]-1])
SET_BIT_NUMBER(*(Data16 + (i / systemBit)), (i % systemBit));
else RESET_BIT_NUMBER(*(Data16 + (i / systemBit)), (i % systemBit));
}
//返回数据
return Data16;
}
/*
* 函数功能:将数据进行DES加密
* 参数:<data>要加密的数据,<data_lenght>要加密的数据长度,<key>进行加密的密钥,<key_lenght>密钥的长度(8字节),<fillingMode>数据补位的模式选择
* 返回值:返回一个结构体,结构体内有加密后数据和加密后数据长度
*/
p_desRetStruct desEncryption(data_size data, data_lenght_size data_lenght, subkey_size key, data_lenght_size key_lenght, enumFillingMode fillingMode)
{
if(key_lenght != 8 || (fillingMode != NOPADDING && fillingMode != PKCS5PADDING))
{
return NULL;
}
//申请堆内存
p_desRetStruct retData = (p_desRetStruct)malloc(sizeof(desRetStruct));
//清空这块内存
memset(retData, 0, sizeof(desRetStruct));
//计算出长度
data_lenght_size mallocLenght = ((data_lenght%8==0)?(data_lenght):(((data_lenght/8)*8)+8));
//申请堆内存
retData->data = (data_size)malloc(mallocLenght);
//长度进行赋值
retData->dataLenght = mallocLenght;
//清空这块内存
memset(retData->data, 0, mallocLenght);
//进行赋值
memcpy(retData->data, data, data_lenght);
//如果是长度是8的整数倍
if(fillingMode == PKCS5PADDING && data_lenght % 8 != 0)
{
for(int i=0;i<8-(data_lenght%8);i++)
{
unsigned char num = (8 - (data_lenght % 8));
//进行拷贝
memcpy(retData->data + data_lenght + i, &num, 1);
}
}
//获取16个子密钥
subkey_size subkey16 = __desSubKeyGeneration(key, key_lenght);
//进行循环每8字节进行加密
for(int i=0; i<mallocLenght; i+=8)
{
//将8字节进行加密
data_size mData = __desDataEncryption(retData->data + i, 8, subkey16, 96);
//将加密后字节拷贝到返回值上
memcpy(retData->data + i, mData, 8);
//释放
free(mData);
}
//释放16个子密钥
free(subkey16);
//返回加密后的数据
return retData;
}
/*
* 函数功能:将DES加密数据进行解密
* 参数:<data>要解密的数据,<data_lenght>要解密的数据长度(8的整数倍字节),<key>进行解密的密钥,<key_lenght>密钥的长度(8字节),<fillingMode>数据补位的模式选择
* 返回值:返回一个结构体,结构体内有解密后数据和解密后数据长度
*/
p_desRetStruct desDecrypt(data_size data, data_lenght_size data_lenght, data_size key, data_lenght_size key_lenght, enumFillingMode fillingMode)
{
if(key_lenght != 8 || (fillingMode != NOPADDING && fillingMode != PKCS5PADDING) || data_lenght%8 != 0 || data_lenght == 0)
{
return NULL;
}
//申请堆内存
p_desRetStruct retData = (p_desRetStruct)malloc(sizeof(desRetStruct));
//清空这块内存
memset(retData, 0, sizeof(desRetStruct));
//申请堆内存
retData->data = (data_size)malloc(data_lenght);
//长度进行赋值
retData->dataLenght = data_lenght;
//清空这块内存
memset(retData->data, 0, data_lenght);
//获取16个子密钥
subkey_size subkey16 = __desSubKeyGeneration(key, key_lenght);
//进行循环每8字节进行解密
for(int i=0; i<data_lenght; i+=8)
{
//将8字节进行解密
data_size mData = __desDataDecrypt(data + i, 8, subkey16, 96);
//将解密后字节拷贝到返回值上
memcpy(retData->data + i, mData, 8);
//释放
free(mData);
}
//按照8-(n%8)补位方式解密
if(fillingMode == PKCS5PADDING)
{
//如果最后一位是0x01~0x07
if(0x01 <= *(retData->data + (data_lenght - 1)) && *(retData->data + (data_lenght - 1)) <= 0x07)
{
//进行8-模次循环
for(int count=1; count<=*(retData->data + (data_lenght - 1)); count++)
{
//判断是否和最后一字节相等
if(*(retData->data + (data_lenght - 1)) == *(retData->data + (data_lenght - count)))
{
retData->dataLenght--;
}
else
{
//如果有一次不相等就说明该数据没有补位
retData->dataLenght = data_lenght;
//退出循环
break;
}
}
}
}
//按照 补位方式解密
else if(fillingMode == NOPADDING)
{
//从尾部开始进行8次判断
for(int count=1; count<=8; count++)
{
//如果这一字节等于0就位去掉
if(0x00 == *(retData->data + (data_lenght - count)))
{
//将长度进行减1
retData->dataLenght--;
}
else
{
//遇到正常数据进行退出循环
break;
}
}
}
//释放16个子密钥
free(subkey16);
//返回加密后的数据
return retData;
}
/*
* 函数功能:将数据进行3DES加密
* 参数:<data>要加密的数据,<data_lenght>要加密的数据长度,<key>进行加密的密钥,<key_lenght>密钥的长度(24字节),<fillingMode>数据补位的模式选择
* 返回值:返回一个结构体,结构体内有加密后数据和加密后数据长度
*/
p_desRetStruct _3desEncryption(data_size data, data_lenght_size data_lenght, subkey_size key, data_lenght_size key_lenght, enumFillingMode fillingMode)
{
if(key_lenght != 24 || (fillingMode != NOPADDING && fillingMode != PKCS5PADDING))
{
return NULL;
}
//申请堆内存
p_desRetStruct retData = (p_desRetStruct)malloc(sizeof(desRetStruct));
//清空这块内存
memset(retData, 0, sizeof(desRetStruct));
//计算出长度
data_lenght_size mallocLenght = ((data_lenght%8==0)?(data_lenght):(((data_lenght/8)*8)+8));
//申请堆内存
retData->data = (data_size)malloc(mallocLenght);
//长度进行赋值
retData->dataLenght = mallocLenght;
//清空这块内存
memset(retData->data, 0, mallocLenght);
//进行赋值
memcpy(retData->data, data, data_lenght);
//如果是长度是8的整数倍
if(fillingMode == PKCS5PADDING && data_lenght % 8 != 0)
{
for(int i=0;i<8-(data_lenght%8);i++)
{
unsigned char num = (8 - (data_lenght % 8));
//进行拷贝
memcpy(retData->data + data_lenght + i, &num, 1);
}
}
//获取16个子密钥
subkey_size subkey1 = __desSubKeyGeneration(key, 8);
//获取16个子密钥
subkey_size subkey2 = __desSubKeyGeneration(key+(key_lenght/3), 8);
//获取16个子密钥
subkey_size subkey3 = __desSubKeyGeneration(key+((key_lenght/3)*2), 8);
//进行循环每8字节进行加密
for(int i=0; i<mallocLenght; i+=8)
{
//将8字节进行加密
data_size mData1 = __desDataEncryption(retData->data + i, 8, subkey1, 96);
data_size mData2 = __desDataDecrypt(mData1, 8, subkey2, 96);
data_size mData3 = __desDataEncryption(mData2, 8, subkey3, 96);
//将加密后字节拷贝到返回值上
memcpy(retData->data + i, mData3, 8);
//释放
free(mData1);
free(mData2);
free(mData3);
}
//释放子密钥
free(subkey1);
free(subkey2);
free(subkey3);
//返回加密后的数据
return retData;
}
/*
* 函数功能:将3DES加密数据进行解密
* 参数:<data>要解密的数据,<data_lenght>要解密的数据长度(8的整数倍字节),<key>进行解密的密钥,<key_lenght>密钥的长度(24字节),<fillingMode>数据补位的模式选择
* 返回值:返回一个结构体,结构体内有解密后数据和解密后数据长度
*/
p_desRetStruct _3desDecrypt(data_size data, data_lenght_size data_len
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