c++ 实现des加密算法
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2019-09-04 12:04:36
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代码为从网上东拼西凑整理出来,已经测试过可以跟c#代码的加密算法互用
c#加密算法实现 http://www.zhaokeli.com/article/8195.html
使用方法
string s = CDES::EnCode("要加密的字符串", "123456");
string s = CDES::DeCode("要解密的字符串", "123456");里面实现啦一个Base64编码类如果不想要十六进制编码可以改下代码使用BASE64编码
Des.h
#ifndef DESH
#define DESH
#include <string>
using namespace std;
//---------------------------------------------------------------------------
//////////////////////////////////////////////////////////////////////
// //
// DES.h: declaration of the TDES、TBase64、TBase64DES class. //
// //
//////////////////////////////////////////////////////////////////////
/* TDES类说明
*
* 该类是DES和3DES算法类
*
*/
class CDES
{
public:
CDES();
virtual ~CDES();
static char* Hex2Bits(string s);
static string Bits2Hex(char* bytes, int bytelength);
//des加密蓝天解密,返回值为十六进制字符串
static string EnCode(string str, string sKey);
static string DeCode(string str, string sKey);
protected:
typedef bool(*PSubKey)[16][48];
//计算并填充子密钥到SubKey数据中
static void SetSubKey(PSubKey pSubKey, const unsigned char Key[8]);
//DES单元运算
static void DES(unsigned char Out[8], const unsigned char In[8], const PSubKey pSubKey, bool Type);
/* 补足8位数据
*
* Description : 根据协议对加密前的数据进行填充
* @param nType : 类型：PAD类型
* @param In : 数据串指针
* @param Out : 填充输出串指针
* @param datalen : 数据的长度
* @param padlen : (in,out)输出buffer的长度，填充后的长度
* @return true--成功；false--失败；
*/
static bool RunPad(bool bType, int nType, const unsigned char* In,
unsigned datalen, unsigned char* Out, unsigned& padlen);
/* 执行DES算法对文本加解密
*
* Description : 执行DES算法对文本加解密
* @param bType : 类型：加密ENCRYPT，解密DECRYPT
* @param bMode : 模式：ECB,CBC
* @param In : 待加密串指针
* @param Out : 待输出串指针
* @param datalen : 待加密串的长度，同时Out的缓冲区大小应大于或者等于datalen
* @param Key : 密钥(可为8位,16位,24位)支持3密钥
* @param keylen : 密钥长度，多出24位部分将被自动裁减
* @return true--成功；false--失败；
*/
static bool RunDES(bool bType, bool bMode, int PaddingMode, const unsigned char* IV, const unsigned char* In,
unsigned char* Out, unsigned datalen, const unsigned char* Key, unsigned keylen);
private:
static int hexCharToInt(char c);
//加密解密
enum
{
ENCRYPT = 0, // 加密
DECRYPT, // 解密
};
//DES算法的模式
enum
{
ECB = 0, // ECB模式
CBC // CBC模式
};
//Pad填充的模式
enum
{
PAD_ISO_1 = 0, // ISO_1填充：数据长度不足8比特的倍数，以0x00补足，如果为8比特的倍数，补8个0x00
PAD_ISO_2, // ISO_2填充：数据长度不足8比特的倍数，以0x80,0x00..补足，如果为8比特的倍数，补0x80,0x00..0x00
PAD_PKCS_7 // PKCS7填充：数据长度除8余数为n,以(8-n)补足为8的倍数，如果为8比特的倍数，补8个0x08
};
};
//---------------------------------------------------------------------------
/* TBase64类说明
*
* 该类是Base64编码类
*
*/
class TBase64
{
public:
static char* Base64_Encode(const char* src);
static char* Base64_Decode(const char* src);
protected:
static void Base64_Encode(unsigned char* src, unsigned char* dest, int srclen);
static void Base64_Decode(unsigned char* src, unsigned char* dest, int srclen);
static int GetLenEncode(const char* src);
static int GetLenDecode(const char* src);
};
//---------------------------------------------------------------------------
#endifDES.cpp
// DES.cpp: implementation of the CDES class.
//
//////////////////////////////////////////////////////////////////////
#include "DES.h"
#include "memory.h"
#include <iostream>
using namespace std;
////////////////////////////////////////////////////////////////////////
// initial permutation IP
const char IP_Table[64] = {
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
};
// final permutation IP^-1
const char IPR_Table[64] = {
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
};
// expansion operation matrix
const char E_Table[48] = {
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
};
// 32-bit permutation function P used on the output of the S-boxes
const char P_Table[32] = {
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
};
// permuted choice table (key)
const char PC1_Table[56] = {
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
};
// permuted choice key (table)
const char PC2_Table[48] = {
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, 45, 33, 48,
44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32
};
// number left rotations of pc1
const char LOOP_Table[16] = {
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1
};
// The (in)famous S-boxes
const char S_Box[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, 9, 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, 9, 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
};
CDES::CDES()
{
}
CDES::~CDES()
{
}
char * CDES::Hex2Bits(string s)
{
int sz = s.length();
char *ret = new char[sz / 2];
for (int i = 0; i < sz; i += 2) {
ret[i / 2] = (char)((hexCharToInt(s.at(i)) << 4)
| hexCharToInt(s.at(i + 1)));
}
return ret;
}
string CDES::Bits2Hex(char* bytes, int bytelength)
{
string str("");
string str2("0123456789ABCDEF");
for (int i = 0; i < bytelength; i++) {
int b;
b = 0x0f & (bytes[i] >> 4);
char s1 = str2.at(b);
str.append(1, str2.at(b));
b = 0x0f & bytes[i];
str.append(1, str2.at(b));
char s2 = str2.at(b);
}
return str;
}
int CDES::hexCharToInt(char c)
{
if (c >= '0' && c <= '9') return (c - '0');
if (c >= 'A' && c <= 'F') return (c - 'A' + 10);
if (c >= 'a' && c <= 'f') return (c - 'a' + 10);
return 0;
}
string CDES::EnCode(string str, string sKey) {
unsigned char buff[1024] = { 0 };
CDES::RunDES(CDES::ENCRYPT, CDES::CBC, CDES::PAD_ISO_1, (const unsigned char*)sKey.c_str(), (const unsigned char*)str.c_str(), buff, strlen(str.c_str()), (const unsigned char*)sKey.c_str(), strlen(sKey.c_str()));
string restr = Bits2Hex((char*)buff, strlen((char*)buff));
return restr;
}
string CDES::DeCode(string str, string sKey) {
try {
unsigned char ch[1024] = { 0 };
char* c = Hex2Bits(str);
char Out[1024] = { 0 };
/* memset(Out, 0x00, 1024);*/
CDES::RunDES(CDES::DECRYPT, CDES::CBC, CDES::PAD_ISO_1, (const unsigned char*)sKey.c_str(), (const unsigned char*)c, (unsigned char*)Out, strlen(str.c_str()), (const unsigned char*)sKey.c_str(), strlen(sKey.c_str()));
string s = Out;
return s;
}
catch (...) {
return "";
}
}
/*******************************************************************/
/*
函 数 名 称: ByteToBit
功 能 描 述： 把BYTE转化为Bit流
参 数 说 明： Out: 输出的Bit流[in][out]
In: 输入的BYTE流[in]
bits: Bit流的长度[in]
/*******************************************************************/
static void ByteToBit(bool *Out, const unsigned char *In, int bits)
{
for (int i = 0; i < bits; ++i)
Out[i] = (In[i >> 3] >> (7 - i & 7)) & 1;
}
/*******************************************************************/
/*
函 数 名 称: BitToByte
功 能 描 述： 把Bit转化为Byte流
参 数 说 明： Out: 输出的BYTE流[in][out]
In: 输入的Bit流[in]
bits: Bit流的长度[in]
/*******************************************************************/
static void BitToByte(unsigned char *Out, const bool *In, int bits)
{
memset(Out, 0, bits >> 3);
for (int i = 0; i < bits; ++i)
Out[i >> 3] |= In[i] << (7 - i & 7);
}
/*******************************************************************/
/*
函 数 名 称: RotateL
功 能 描 述： 把BIT流按位向左迭代
参 数 说 明： In: 输入的Bit流[in]
len: Bit流的长度[in]
loop: 向左迭代的长度
/*******************************************************************/
static void RotateL(bool *In, int len, int loop)
{
bool Tmp[256];
memcpy(Tmp, In, loop);
memcpy(In, In + loop, len - loop);
memcpy(In + len - loop, Tmp, loop);
}
/*******************************************************************/
/*
函 数 名 称: Xor
功 能 描 述： 把两个Bit流进行异或
参 数 说 明： InA: 输入的Bit流[in][out]
InB: 输入的Bit流[in]
loop: Bit流的长度
/*******************************************************************/
static void Xor(bool *InA, const bool *InB, int len)
{
for (int i = 0; i < len; ++i)
InA[i] ^= InB[i];
}
/*******************************************************************/
/*
函 数 名 称: Transform
功 能 描 述： 把两个Bit流按表进行位转化
参 数 说 明： Out: 输出的Bit流[out]
In: 输入的Bit流[in]
Table: 转化需要的表指针
len: 转化表的长度
/*******************************************************************/
static void Transform(bool *Out, bool *In, const char *Table, int len)
{
bool Tmp[256];
for (int i = 0; i < len; ++i)
Tmp[i] = In[Table[i] - 1];
memcpy(Out, Tmp, len);
}
/*******************************************************************/
/*
函 数 名 称: S_func
功 能 描 述： 实现数据加密S BOX模块
参 数 说 明： Out: 输出的32Bit[out]
In: 输入的48Bit[in]
/*******************************************************************/
static void S_func(bool Out[32], const bool In[48])
{
for (char i = 0, j, k; i < 8; ++i, In += 6, Out += 4)
{
j = (In[0] << 1) + In[5];
k = (In[1] << 3) + (In[2] << 2) + (In[3] << 1) + In[4]; //组织SID下标
for (int l = 0; l < 4; ++l) //把相应4bit赋值
Out[l] = (S_Box[i][j][k] >> (3 - l)) & 1;
}
}
/*******************************************************************/
/*
函 数 名 称: F_func
功 能 描 述： 实现数据加密到输出P
参 数 说 明： Out: 输出的32Bit[out]
In: 输入的48Bit[in]
/*******************************************************************/
static void F_func(bool In[32], const bool Ki[48])
{
bool MR[48];
Transform(MR, In, E_Table, 48);
Xor(MR, Ki, 48);
S_func(In, MR);
Transform(In, In, P_Table, 32);
}
bool CDES::RunDES(bool bType, bool bMode, int PaddingMode, const unsigned char* Iv, const unsigned char* In,
unsigned char* Out, unsigned datalen, const unsigned char* Key, unsigned keylen)
{
memset(Out, 0x00, strlen((const char*)Out));
unsigned char* outbuf = Out;
//判断输入合法性
if (!(/*In && */outbuf && Key && /*datalen &&*/ keylen >= 8)) // 空字符串加密的时候In和datalen都为0,应该去掉此判断
return false;
unsigned char* inbuf = new unsigned char[datalen + 8]{ 0 };
//memset(inbuf, 0x00, datalen + 8);
memcpy(inbuf, In, datalen);
unsigned padlen = datalen;
// 根据填充模式填充
if (!RunPad(bType, PaddingMode, In, datalen, inbuf, padlen))
{
delete[]inbuf; inbuf = NULL;
return false;
}
unsigned char* tempBuf = inbuf;
bool m_SubKey[3][16][48]; //密钥
//构造并生成SubKeys
unsigned char nKey = (keylen >> 3) >= 3 ? 3 : (keylen >> 3);
for (int i = 0; i < nKey; i++)
{
SetSubKey(&m_SubKey[i], &Key[i << 3]);
}
if (bMode == ECB) //ECB模式
{
if (nKey == 1) //单Key
{
int j = padlen >> 3;
for (int i = 0, j = padlen >> 3; i < j; ++i, outbuf += 8, tempBuf += 8)
{
DES(outbuf, tempBuf, &m_SubKey[0], bType);
}
}
else
if (nKey == 2) //3DES 2Key
{
for (int i = 0, j = padlen >> 3; i < j; ++i, outbuf += 8, tempBuf += 8)
{
DES(outbuf, tempBuf, &m_SubKey[0], bType);
DES(outbuf, outbuf, &m_SubKey[1], !bType);
DES(outbuf, outbuf, &m_SubKey[0], bType);
}
}
else //3DES 3Key
{
for (int i = 0, j = padlen >> 3; i < j; ++i, outbuf += 8, tempBuf += 8)
{
DES(outbuf, tempBuf, &m_SubKey[bType ? 2 : 0], bType);
DES(outbuf, outbuf, &m_SubKey[1], !bType);
DES(outbuf, outbuf, &m_SubKey[bType ? 0 : 2], bType);
}
}
}
else //CBC模式
{
unsigned char cvec[8] = ""; // 扭转向量
unsigned char cvin[8] = ""; // 中间变量
memcpy(cvec, Iv, 8);
if (nKey == 1) //单Key
{
for (int i = 0, j = padlen >> 3; i < j; ++i, outbuf += 8, tempBuf += 8)
{
if (bType == CDES::ENCRYPT)
{
for (int j = 0; j < 8; ++j) //将输入与扭转变量异或
{
cvin[j] = tempBuf[j] ^ cvec[j];
}
}
else
{
memcpy(cvin, tempBuf, 8);
}
DES(outbuf, cvin, &m_SubKey[0], bType);
if (bType == CDES::ENCRYPT)
{
memcpy(cvec, outbuf, 8); //将输出设定为扭转变量
}
else
{
for (int j = 0; j < 8; ++j) //将输出与扭转变量异或
{
outbuf[j] = outbuf[j] ^ cvec[j];
}
memcpy(cvec, cvin, 8); //将输入设定为扭转变量
}
}
}
else
if (nKey == 2) //3DES CBC 2Key
{
for (int i = 0, j = padlen >> 3; i < j; ++i, outbuf += 8, tempBuf += 8)
{
if (bType == CDES::ENCRYPT)
{
for (int j = 0; j < 8; ++j) //将输入与扭转变量异或
{
cvin[j] = tempBuf[j] ^ cvec[j];
}
}
else
{
memcpy(cvin, tempBuf, 8);
}
DES(outbuf, cvin, &m_SubKey[0], bType);
DES(outbuf, outbuf, &m_SubKey[1], !bType);
DES(outbuf, outbuf, &m_SubKey[0], bType);
if (bType == CDES::ENCRYPT)
{
memcpy(cvec, outbuf, 8); //将输出设定为扭转变量
}
else
{
for (int j = 0; j < 8; ++j) //将输出与扭转变量异或
{
outbuf[j] = outbuf[j] ^ cvec[j];
}
memcpy(cvec, cvin, 8); //将输入设定为扭转变量
}
}
}
else //3DES CBC 3Key
{
for (int i = 0, j = padlen >> 3; i < j; ++i, outbuf += 8, tempBuf += 8)
{
if (bType == CDES::ENCRYPT)
{
for (int j = 0; j < 8; ++j) //将输入与扭转变量异或
{
cvin[j] = tempBuf[j] ^ cvec[j];
}
}
else
{
memcpy(cvin, tempBuf, 8);
}
DES(outbuf, cvin, &m_SubKey[bType ? 2 : 0], bType);
DES(outbuf, outbuf, &m_SubKey[1], !bType);
DES(outbuf, outbuf, &m_SubKey[bType ? 0 : 2], bType);
if (bType == CDES::ENCRYPT)
{
memcpy(cvec, outbuf, 8); //将输出设定为扭转变量
}
else
{
for (int j = 0; j < 8; ++j) //将输出与扭转变量异或
{
outbuf[j] = outbuf[j] ^ cvec[j];
}
memcpy(cvec, cvin, 8); //将输入设定为扭转变量
}
}
}
}
if (inbuf)
{
delete[]inbuf;
inbuf = NULL;
}
if (bType == CDES::DECRYPT)
{
if (PaddingMode == PAD_ISO_1)
{
//待补充
}
else
if (PaddingMode == PAD_ISO_2)
{
//待补充
}
else
if (PaddingMode == PAD_PKCS_7)
{
unsigned int l_Out = strlen((const char*)Out);
unsigned int l_num = Out[l_Out - 1];
if (l_num <= 8) // 非法密文會造成此處出問題，加以保護
memset(Out + l_Out - l_num, 0x00, l_num);
}
}
return true;
}
/*******************************************************************/
/*
函 数 名 称: RunPad
功 能 描 述： 根据协议对加密前的数据进行填充
参 数 说 明： bType :类型：PAD类型
In :数据串指针
Out :填充输出串指针
datalen :数据的长度
padlen :(in,out)输出buffer的长度，填充后的长度
返回值 说明： bool :是否填充成功
*/
/*******************************************************************/
bool CDES::RunPad(bool bType, int nType, const unsigned char* In,
unsigned datalen, unsigned char* Out, unsigned& padlen)
{
if (nType < PAD_ISO_1 || nType > PAD_PKCS_7)
return false;
if (In == NULL || datalen < 0 || Out == NULL)
return false;
int res = (datalen & 0x07);
if (bType == CDES::DECRYPT)
{
padlen = datalen;
memcpy(Out, In, datalen);
return true;
}
padlen = (datalen + 8 - res);
memcpy(Out, In, datalen);
if (nType == PAD_ISO_1)
{
memset(Out + datalen, 0x00, 8 - res);
}
else
if (nType == PAD_ISO_2)
{
memset(Out + datalen, 0x80, 1);
memset(Out + datalen, 0x00, 7 - res);
}
else
if (nType == PAD_PKCS_7)
{
memset(Out + datalen, 8 - res, 8 - res);
}
else
{
// 其他填充模式尚待补充
return false;
}
return true;
}
//计算并填充子密钥到SubKey数据中
void CDES::SetSubKey(PSubKey pSubKey, const unsigned char Key[8])
{
bool K[64], *KL = &K[0], *KR = &K[28];
ByteToBit(K, Key, 64);
Transform(K, K, PC1_Table, 56);
for (int i = 0; i < 16; ++i) {
RotateL(KL, 28, LOOP_Table[i]);
RotateL(KR, 28, LOOP_Table[i]);
Transform((*pSubKey)[i], K, PC2_Table, 48);
}
}
//DES单元运算
void CDES::DES(unsigned char Out[8], const unsigned char In[8], const PSubKey pSubKey, bool Type)
{
bool M[64], tmp[32], *Li = &M[0], *Ri = &M[32];
ByteToBit(M, In, 64);
Transform(M, M, IP_Table, 64);
if (Type == ENCRYPT)
{
for (int i = 0; i < 16; ++i)
{
memcpy(tmp, Ri, 32); //Ri[i-1] 保存
F_func(Ri, (*pSubKey)[i]); //Ri[i-1]经过转化和SBox输出为P
Xor(Ri, Li, 32); //Ri[i] = P XOR Li[i-1]
memcpy(Li, tmp, 32); //Li[i] = Ri[i-1]
}
}
else
{
for (int i = 15; i >= 0; --i)
{
memcpy(tmp, Ri, 32); //Ri[i-1] 保存
F_func(Ri, (*pSubKey)[i]); //Ri[i-1]经过转化和SBox输出为P
Xor(Ri, Li, 32); //Ri[i] = P XOR Li[i-1]
memcpy(Li, tmp, 32); //Li[i] = Ri[i-1]
}
}
RotateL(M, 64, 32); //Ri与Li换位重组M
Transform(M, M, IPR_Table, 64); //最后结果进行转化
BitToByte(Out, M, 64); //组织成字符
}
//转换前 aaaaaabb ccccdddd eeffffff
//转换后 00aaaaaa 00bbcccc 00ddddee 00ffffff
void TBase64::Base64_Encode(unsigned char* src, unsigned char* dest, int srclen)
{
//编码函数
unsigned char EncodeIndex[] =
{
//编码索引表
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f',
'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/','='
};
int sign = 0;
for (int i = 0; i != srclen; i++, src++, dest++)
{
switch (sign)
{
case 0://编码第1字节
*(dest) = EncodeIndex[*src >> 2];
break;
case 1://编码第2字节
*dest = EncodeIndex[((*(src - 1) & 0x03) << 4) | (((*src) & 0xF0) >> 4)];
break;
case 2://编码第3字节
*dest = EncodeIndex[((*(src - 1) & 0x0F) << 2) | ((*(src) & 0xC0) >> 6)];
*(++dest) = EncodeIndex[(*(src) & 0x3F)];//编码第4字节
break;
}
(sign == 2) ? (sign = 0) : (sign++);
}
switch (sign)
{
//3的余数字节，后补=处理
case 0:
break;
case 1:
// *(dest++) = EncodeIndex[((*(src-1) & 0x03) << 4) | (((*src) & 0xF0) >> 4)];
*(dest++) = EncodeIndex[((*(src - 1) & 0x03) << 4)];
*(dest++) = '=';
*(dest++) = '=';
break;
case 2:
// *(dest++) = EncodeIndex[((*(src-1) &0x0F) << 2) | ((*(src) & 0xC0) >> 6)];
*(dest++) = EncodeIndex[((*(src - 1) & 0x0F) << 2)];
*(dest++) = '=';
break;
default:
break;
}
}
//---------------------------------------------------------------------------
void TBase64::Base64_Decode(unsigned char* src, unsigned char* dest, int srclen)
{
unsigned char DecodeIndex[] =
{
//解码索引表
0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,//0 00-15
0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,//1 16-31
0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x3E,0x40,0x40,0x40,0x3F,//2 32-47 43[+](0x38) 47[/](0x39)
0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,0x3C,0x3D,0x40,0x40,0x40,0x40,0x40,0x40,//3 48-63 48[0](0x34)- 57[9](0x3D) 61[=](0x40)
0x40,0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,//4 64-79 65[A](0x00)- 79[O](0x0E)
0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x40,0x40,0x40,0x40,0x40,//5 80-95 80[P](0x0F)- 90[Z](0x19)
0x40,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,//6 96-111 97[a](0x1A)-111[o](0x28)
0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,0x30,0x31,0x32,0x33,0x40,0x40,0x40,0x40,0x40 //7 112-127 122[p](0x29)-122[z](0x33)
};
//解码处理函数 //len%4 == 0总为true;
for (int i = 0; i != srclen / 4; i++)//对于不足4个的不作计算
{
//每个字符,通过数组直接得到其值,比较快
*dest = (DecodeIndex[*src] << 2) | ((DecodeIndex[*(src + 1)] & 0x30) >> 4);
*(dest + 1) = (DecodeIndex[*(src + 1)] << 4) | ((DecodeIndex[*(src + 2)] & 0x3C) >> 2);
*(dest + 2) = ((DecodeIndex[*(src + 2)] & 0x03) << 6) | (DecodeIndex[*(src + 3)] & 0x3F);
src += 4;
dest += 3;
}
}
//---------------------------------------------------------------------------
//*/
int TBase64::GetLenEncode(const char* src)
{
//求编码后的长度
int len = strlen((char*)src);
return (len + (len % 3 == 0 ? 0 : (3 - len % 3))) / 3 * 4 + 1;
}
//---------------------------------------------------------------------------
int TBase64::GetLenDecode(const char* src)
{
//求解码后的长度
int len = strlen(src);
return len / 4 * 3 + 1;
}
//---------------------------------------------------------------------------
char* TBase64::Base64_Encode(const char* src)
{
int src_len = strlen(src);
int lenEncode = GetLenEncode(src);
unsigned char* Base64Out = new unsigned char[lenEncode];
memset(Base64Out, 0x00, lenEncode);
Base64_Encode((unsigned char *)src, (unsigned char *)Base64Out, src_len);//原字符长度
return (char*)Base64Out;
}
//---------------------------------------------------------------------------
char* TBase64::Base64_Decode(const char* src)
{
int lenEncode = strlen(src);
int lenDecode = GetLenDecode((const char *)src);//获得编码后字符串的再解码的长度
unsigned char* pDecodeStr = new unsigned char[lenDecode];
memset(pDecodeStr, 0x00, lenDecode);
Base64_Decode((unsigned char *)src, pDecodeStr, lenEncode);//编码后的字符长度
return (char*)pDecodeStr;
}
//---------------------------------------------------------------------------
