package myLib.AES;
/**
* This class is designed to encrypt file using AES.
* @author ZhuTao 2006.5.5.HUST
* Email:greenkugua@sina.com.cn
* QQ:307356132
* @version 1.0
*/
/**
* 可以把它们做成自己的库函数，方便以后使用。
*/
public class AESMap {
public static char [] key;
public static char [] w;//用来存放扩展后的子密钥;
public static char []Log = {
0,0,25,1,50,2,26,0xc6,75,199,27,104,51,238,223,3,100,4,
224,14,52,141,129,239,76,113,8,200,248,105,28,193,125,194,29,
181,249,185,39,106,77,228,166,114,154,201,9,120,101,47,138,
5,33,15,225,36,18,240,130,69,53,147,218,142,150,143,219,189,
54,208,206,148,19,92,210,241,64,70,131,56,102,221,253,48,
191,6,139,98,179,37,226,152,34,136,145,16,126,110,72,195,163,
182,30,66,58,107,40,84,250,133,61,186,43,121,10,21,155,159,
94,202,78,212,172,229,243,115,167,87,175,88,168,80,244,234,
214,116,79,174,233,213,231,230,173,232,44,215,117,122,235,
22,11,245,89,203,95,176,156,169,81,160,127,12,246,111,23,
196,73,236,216,67,31,45,164,118,123,183,204,187,62,90,251,96,
177,134,59,82,161,108,170,85,41,157,151,178,135,144,97,190,
220,252,188,149,207,205,55,63,91,209,83,57,132,60,65,162,
109,71,20,42,158,93,86,242,211,171,68,17,146,217,35,32,46,137,
180,124,184,38,119,153,227,165,103,74,237,222,197,49,254,
24,13,99,140,128,192,247,112,7,};
public static char[] Log_1 = {
1,3,5,15,17,51,85,255,26,46,114,150,161,248,19,53,95,225,
56,72,216,115,149,164,247,2,6,10,30,34,102,170,229,52,92,
228,55,89,235,38,106,190,217,112,144,171,230,49,83,245,4,12,
20,60,68,204,79,209,104,184,211,110,178,205,76,212,103,169,
224,59,77,215,98,166,241,8,24,40,120,136,131,158,185,208,
107,189,220,127,129,152,179,206,73,219,118,154,181,196,87,249,
16,48,80,240,11,29,39,105,187,214,97,163,254,25,43,125,135,
146,173,236,47,113,147,174,233,32,96,160,251,22,58,78,210,
109,183,194,93,231,50,86,250,21,63,65,195,94,226,61,71,201,
64,192,91,237,44,116,156,191,218,117,159,186,213,100,172,
239,42,126,130,157,188,223,122,142,137,128,155,182,193,88,232,
35,101,175,234,37,111,177,200,67,197,84,252,31,33,99,165,
244,7,9,27,45,119,153,176,203,70,202,69,207,74,222,121,139,
134,145,168,227,62,66,198,81,243,14,18,54,90,238,41,123,141,
140,143,138,133,148,167,242,13,23,57,75,221,124,132,151,162,
253,28,36,108,180,199,82,246,1};
// S盒置换
public static char [] S_BOX = {
99,124,119,123,242,107,111,197,48,1,103,43,254,215,171,
118,202,130,201,125,250,89,71,240,173,212,162,175,156,164,
114,192,183,253,147,38,54,63,247,204,52,165,229,241,113,216,
49,21,4,199,35,195,24,150,5,154,7,18,128,226,235,39,178,117,
9,131,44,26,27,110,90,160,82,59,214,179,41,227,47,132,83,209,
0,237,32,252,177,91,106,203,190,57,74,76,88,207,208,239,
170,251,67,77,51,133,69,249,2,127,80,60,159,168,81,163,64,
143,146,157,56,245,188,182,218,33,16,255,243,210,205,12,19,236,
95,151,68,23,196,167,126,61,100,93,25,115,96,129,79,220,
34,42,144,136,70,238,184,20,222,94,11,219,224,50,58,10,73,6,
36,92,194,211,172,98,145,149,228,121,231,200,55,109,141,213,
78,169,108,86,244,234,101,122,174,8,186,120,37,46,28,166,
180,198,232,221,116,31,75,189,139,138,112,62,181,102,72,3,
246,14,97,53,87,185,134,193,29,158,225,248,152,17,105,217,142,
148,155,30,135,233,206,85,40,223,140,161,137,13,191,230,
66,104,65,153,45,15,176,84,187,22,};
// S盒逆置换；
public char [] S_BOX_1={
82,9,106,213,48,54,165,56,191,64,163,158,129,243,215,251,
124,227,57,130,155,47,255,135,52,142,67,68,196,222,233,203,
84,123,148,50,166,194,35,61,238,76,149,11,66,250,195,78,8,
46,161,102,40,217,36,178,118,91,162,73,109,139,209,37,114,
248,246,100,134,104,152,22,212,164,92,204,93,101,182,146,108,
112,72,80,253,237,185,218,94,21,70,87,167,141,157,132,144,
216,171,0,140,188,211,10,247,228,88,5,184,179,69,6,208,44,
30,143,202,63,15,2,193,175,189,3,1,19,138,107,58,145,17,65,
79,103,220,234,151,242,207,206,240,180,230,115,150,172,116,
34,231,173,53,133,226,249,55,232,28,117,223,110,71,241,26,
113,29,41,197,137,111,183,98,14,170,24,190,27,252,86,62,75,
198,210,121,32,154,219,192,254,120,205,90,244,31,221,168,51,
136,7,199,49,177,18,16,89,39,128,236,95,96,81,127,169,25,181,
74,13,45,229,122,159,147,201,156,239,160,224,59,77,174,42,
245,176,200,235,187,60,131,83,153,97,23,43,4,126,186,119,214,
38,225,105,20,99,85,33,12,125,};
public static char []Rcon={
0x01,0x00,0x00,0x00,
0x02,0x00,0x00,0x00,
0x04,0x00,0x00,0x00,
0x08,0x00,0x00,0x00,
0x10,0x00,0x00,0x00,
0x20,0x00,0x00,0x00,
0x40,0x00,0x00,0x00,
0x80,0x00,0x00,0x00,
0x1b,0x00,0x00,0x00,
0x36,0x00,0x00,0x00};
public AESMap()
{
key = new char[4*8];
w = new char[8*15*4];//用来存放扩展后的子密钥;
}
}
package myLib.AES;
import java.io.IOException;
import java.io.FileOutputStream;
import java.io.FileInputStream;/**
* This class is designed to encrypt file using AES.
* @author ZhuTao 2006.5.5.HUST
* Email:greenkugua@sina.com.cn
* QQ:307356132
* @version 1.0
*/
/**
*
* 把它们做成自己的库函数，方便以后使用。
*/
public class AES extends AESMap {
/**
* This method is used to encrypt data with AES.
* @param OpenPath the path of the file which you want to encrypt.
* @param SavePath the path to save the encrypted file
* @param m_Key the encrypt key of user.
* @param Nb the length of file blocks(32bits)
* @param Nk the length of key.
* @return the length of data.(bytes)
* @throws IOException
////////////////////////////////////////////////////
功能： AES加密
入口参数：m_Key是用户加密密钥；
fp1是要加密的文件指针；
fp2是加密后保存密文的文件指针；
Nb是加密时明文的分组长度（以32bit为单位）；
Nk是密钥的长度（以32bit为单位）；
///////////////////////////////////////////////////
*/
public long AES_Encrypt(String OpenPath,String SavePath,String m_Key,int Nb,int Nk)
throws IOException
{
//以二进制读的方式打开要加密的文件；
//以二进制写的方式打开保存密文的文件；
FileInputStream fp1 = new FileInputStream(OpenPath);
FileOutputStream fp2 = new FileOutputStream(SavePath,true);
int Length = fp1.available();//得到要加密的文件的长度；
if(Length==0)return 0;
int leave = Length%(4*Nb); //求剩余的字块的字节数；
long rounds = Length/(4*Nb); //得到整块的加密轮数；
if(leave!=0)rounds++;
long copy_rounds = rounds;
byte[] state = new byte[4*8]; //作为加密时存放要加密的明文块；
byte[] copy = new byte[4*8]; //用来进行短块处理时的缓存区；
int Nr=GetRounds(Nb,Nk); //得到加密的轮数；
KeyExpansion(m_Key,Nb,Nk,Nr); //生成各轮子密钥；
if(copy_rounds==1&&rounds==1)
{
if(leave==0) fp1.read(state,0,4*Nb);//明文的长度恰好等于分组长度；
else
{
fp1.read(state,0,leave);//明文的长度小于八个字符；
for(int i=leave;i<4*Nb;i++)
state[i]=0; //后面用空格补齐；
}
state = Transform(ByteToChar(state),Nb,Nr); //加密变换；
fp2.write(state,0,4*Nb);//将加密后的密文块写入目标文件；
rounds--;
}
else if(copy_rounds>1&&leave!=0)//如果明文的长度大于分组长度且字符数不是分组长度的整数倍
{ //时，需要进行短块处理；
fp1.read(state,0,4*Nb);
state = Transform(ByteToChar(state),Nb,Nr);//先加密最前面的一块；
fp2.write(state,0,leave);//仅将余数个字符存入文件，而将后部分密文
//与后面的明文合在一起加密；
int j=0;
for(int i=leave;i<4*Nb;i++)
copy[j++]=state[i];
fp1.read(copy,j,leave);
copy = Transform(ByteToChar(copy),Nb,Nr);
fp2.write(copy,0,4*Nb);
rounds-=2;
}
while(rounds>0)//以下处理的明文是分组的整数倍的情况；
{
fp1.read(state,0,4*Nb);
state = Transform(ByteToChar(state),Nb,Nr);
fp2.write(state,0,4*Nb);
rounds--;
}
fp1.close();//关闭源文件和目标文件；
fp2.close();
return ((copy_rounds-1)*4*Nb+leave);//返回文件长度；
}
/**
* This method is used to de-encrypt cryptograph.
* @param OpenPath the path of cryptograph.
* @param SavePath the path to save the de-encrypted file.
* @param m_Key the key to de-encrypt file.
* @param Nb the length of file blocks(32bits)
* @param Nk the length of key.
* @return the length of data.(bytes)
* @throws IOException
////////////////////////////////////////////////////////
功能： 实现AES的解密
入口参数：m_Key是用户加密密钥；
fp1是要解密的文件指针；
fp2是解密后保存明文的文件指针；
Nb是解密时密文的分组长度（以32bit为单位）；
Nk是密钥的长度（以32bit为单位）；
注意了， 解密时和加密时的分组长度要一致；
/////////////////////////////////////////////////////////
*/
public long AES_DeEncrypt(String OpenPath,String SavePath,String m_Key, int Nb, int Nk)
throws IOException
{
//以二进制读的方式打开要加密的文件；
//以二进制写的方式打开保存密文的文件；
FileInputStream fp1= new FileInputStream(OpenPath);
FileOutputStream fp2= new FileOutputStream(SavePath,true);
int Length = fp1.available();//得到要加密的文件的长度；
if(Length==0)return 0;
int leave=Length%(4*Nb);//求剩余的字块的字节数；
long rounds=Length/(4*Nb);//得到整块的加密轮数；
if(leave!=0)rounds++;
long copy_rounds=rounds;
byte []state = new byte[4*8]; //解密时存放密文块；
int Nr = GetRounds(Nb,Nk); //得到解密时循环轮数；
KeyExpansion(m_Key,Nb,Nk,Nr); //生成各轮子密钥
byte[] copy = new byte[32];
if(leave!=0)//需要进行短块处理
{
fp1.read(copy,0,leave);//先把余数个密文字符保存；
fp1.read(state,0,4*Nb);//读取紧接着的一个密文块；
state = ReTransform(ByteToChar(state),Nb,Nr); //解密；
int j=0;
for(int i=leave;i<4*Nb;i++) //把解密后的明文和前面的余数个合在一起组成一块，
copy[i]=state[j++]; //一起解密；
copy = ReTransform(ByteToChar(copy),Nb,Nr);
//将解密后的明文写入目标文件；
fp2.write(copy,0,4*Nb);
fp2.write(state,j,leave);//将余数个明文写入目标文件；
rounds-=2; //已经完成了两轮解密所以减二；
}
while(rounds>0)//对后面是分组长度的整数倍的密文块解密；
{
fp1.read(state,0,4*Nb);//读取密文块；
copy = ReTransform(ByteToChar(state),Nb,Nr); //解密变换；
fp2.write(copy,0,4*Nb);//将解密后的明文写入目标文件；
rounds--; //轮数减一；
}
fp1.close();//关闭源文件和目标文件；
fp2.close();
return ((copy_rounds-1)*4*Nb+leave);//返回文件长度
}
/**
* This method is used to shift the data in array A.
* @param A
//////////////////////////////////////////////////////
功能：将数组A中的四个字节循环左移一个字节；
//////////////////////////////////////////////////////
*/
public void RotWord(char[]A)
{
char temp;
temp=A[0];
A[0] = A[1];
A[1] = A[2];
A[2] = A[3];
A[3] = temp;
}
/**
* This method is used to do S-replace durying key-expansion.
* @param A
////////////////////////////////////////////////
功能： 密钥扩展的时候进行S盒替换；
入口参数：A是存放四个字节的数组；
////////////////////////////////////////////////
*/
public void SubWord(char []A)
{
for(int i=0;i<4;i++)
A[i]=S_BOX[A[i]];
}
/**
* This method is used to get rounds of encrypt.
* @param Nb the length of file blocks(32bits)
* @param Nk the length of key.
* @return the rounds of encrypt.
//////////////////////////////////////////////////
功能：返回加密的轮数；
入口参数：Nb以32bit为单位的待加密明文的长度；
Nk是以32bit为单位的初始密钥的长度；
返回值：返回加密轮数（Nr）；
////////////////////////////////////////////////////
*/
public int GetRounds(int Nb, int Nk)
{
switch(Nb)
{
case 4:switch(Nk)
{
case 4:return 10;
case 6:return 12;
case 8:return 14;
default:return 0;
}
case 6:switch(Nk)
{
case 4:
case 6:return 12;
case 8:return 14;
default:return 0;
}
case 8:switch(Nk)
{
case 4:
case 6:
case 8:return 14;
default:return 0;
}
default:return 0;
}
}
/**
* This method is used to build sub-keys used in each rounds。
* @param m_Key the key of user.
* @param Nb the length of file blocks(32bits)
* @param Nk the length of key.
* @param Nr the rounds of encrypt in each block.
////////////////////////////////////////////////////
入口参数：Nb以32bit为单位的待加密明文的长度；
Nk是以32bit为单位的初始密钥的长度；
Nr是加密的轮数；
m_Key是用户的密钥；
返回值：扩展后的子密钥存放在数组w中；
*/
public void KeyExpansion(String m_Key,int Nb, int Nk, int Nr)
{
int i=0;
for(;i<4;i++)
for(int j=0;j key[i*Nk+j]=m_Key.charAt(i*4+j);
i=0;
while(i {
w[i*4]=key[i*4];
w[i*4+1]=key[i*4+1];
w[i*4+2]=key[i*4+2];
w[i*4+3]=key[i*4+3];
i++;
}
i=Nk;
while(i {
char []temp = new char[4];
temp[0]=w[(i-1)*4+0];temp[1]=w[(i-1)*4+1];
temp[2]=w[(i-1)*4+2];temp[3]=w[(i-1)*4+3];
if((i%Nk)==0)
{
RotWord(temp);
SubWord(temp);
for(int j=0;j<4;j++)
temp[j]^=Rcon[((i-1)/Nk)*4+j];//与Rcon异或；
}
else if(Nk==8&&i%Nk==4)
SubWord(temp);
w[i*4+0] = (char)(w[(i-Nk)*4+0]^temp[0]);
w[i*4+1] = (char)(w[(i-Nk)*4+1]^temp[1]);
w[i*4+2] = (char)(w[(i-Nk)*4+2]^temp[2]);
w[i*4+3] = (char)(w[(i-Nk)*4+3]^temp[3]);
i++;
}
}
/**
* This method is used to do S-replace.
* @param state is a array which stored the data block.
* @param Nb the length of data block.
///////////////////////////////////////////////////
功能： S盒置换
入口参数： Nb为以32bit为单位的明文块的大小；
state为明文块；
////////////////////////////////////////////////////
*/
public void SubChar(char []state,int Nb)
{
for(int i=0;i<4*Nb;i++)
state[i]=S_BOX[state[i]%256];
}
/**
* @param state is a array which stored the data block.
* @param Nb the length of data block.
/////////////////////////////////////////////////////
功能： 加密对明文块进行移位运算；
入口参数：state是明文块；
Nb是以32比特为单位的明文块的大小；
//////////////////////////////////////////////////////
*/
public void ShiftRows(char []state, int Nb)
{
char[] t = new char [8];
for( int r=0;r<4;r++)
{
for(int c=0;c for(int c=0;c state[Nb*r+c]=t[c];
}
}
/**
* This method is used to mix columns.
* @param state is a array which stored the data block.
* @param Nb the length of data block.
//////////////////////////////////////////////////
功能：加密时对明文块进行列混合变换;
入口参数：state是明文块；
Nb是以32比特为单位的明文块的大小；
//////////////////////////////////////////////////
*/
public void MixColumns(char[]state, int Nb)
{
int [] t = new int[4];
for( int c=0;c {
for(int r=0;r<4;r++)t[r] = state[Nb*r+c];
for(int r=0;r<4;r++)
{
state[Nb*r+c] = (char)(Ffmul(0x02,t[r])^Ffmul(0x03,t[(r+1)%4])
^t[(r+2)%4]^t[(r+3)%4]);
}
}
}
/**
* This method is used to get the product of A and B.
* @param A first number.
* @param B second number.
* @return the product of A and B.
/////////////////////////////////////////////////////////
功能：返回两个域元素A，B的积;
/////////////////////////////////////////////////////////
*/
public int Ffmul(int A, int B)
{
//查对数表;
if(A==0||B==0)return 0;
A = Log[A];
B = Log[B];
A =(A+B)%0xff;
//查反对数表;
A = Log_1[A];
return A;
}
/**
* This method is used to add round key and data.
* @param state is the array which contains the data.
* @param Nb length of data block(32bits).
* @param round the index of current round.
///////////////////////////////////////////////////////////////
功能: 轮密钥加变换;
入口参数: state明文块
w为子密钥,Nb为明文块的大小,round为当前加密的轮数;
///////////////////////////////////////////////////////////////
*/
public void AddRoundKey(char[]state, int Nb,int round)
{
for(int c=0;c for(int r=0;r<4;r++)
state[r*Nb+c] = (char)(state[r*Nb+c]^w[round*4+r]);
}
/**
* This method is used to do exchang durying the proccess of encryption.
* @param state is a array which contains the data to encrypt.
* @param Nb the length of data block(32bits).
* @param Nr the length of user key
* @return the cryptograph.
*/
public byte[] Transform(char[]state, int Nb,int Nr)
{
int round=1;
AddRoundKey(state,Nb,0);
for(;round {
SubChar(state,Nb);
ShiftRows(state,Nb);
MixColumns(state,Nb);
AddRoundKey(state,Nb,round*Nb);
}
SubChar(state,Nb);
ShiftRows(state,Nb);
AddRoundKey(state,Nb,round*Nb);
return CharToByte(state);
}
/**
* This method is used to do exchang durying the proccess of de-encryption.
* @param state is a array which contains the cryptograph to de-encrypt.
* @param Nb the length of cryptograph block(32bits).
* @param Nr the length of user key
* @return the original text.
*/
public byte[] ReTransform(char []state, int Nb,int Nr)
{
AddRoundKey(state, Nb,Nr*Nb);
for(int round=Nr-1;round>=1;round--)
{
InvShiftRows(state,Nb);
InvSubint(state,Nb);
AddRoundKey(state,Nb,round*Nb);
InvMixColumns(state,Nb);
}
InvShiftRows(state,Nb);
InvSubint(state,Nb);
AddRoundKey(state,Nb,0);
return CharToByte(state);
}
/**
* This method is used to do S-replace durying de-encrypt cryptograph .
* @param state is a array which contains the cryptograph to de-encrypt.
* @param Nb the length of cryptograph block(32bits).
* @param Nr the length of user key
/////////////////////////////////////////////////////////////
功能：解密时的S盒逆置换；
入口参数：state为密文块；
Nb为密文块的大小；
*/
public void InvSubint(char []state, int Nb)
{
for(int i=0;i<4*Nb;i++)
state[i] = S_BOX_1[state[i]%256];
}
/**
* This method is used to shift rows durying de-encyrpt cryptograph .
* @param state is a array which contains the cryptograph to de-encrypt.
* @param Nb the length of cryptograph block(32bits).
////////////////////////////////////////////////////////////////
功能：解密的时候的右移位变换；
入口参数：state为密文块；
Nb为密文块的大小；
////////////////////////////////////////////////////////////////
*/
public void InvShiftRows(char[]state, int Nb)
{
char [] t = new char[8];
for( int r=0;r<4;r++)
{
for(int c=0;c t[(c+r)%Nb] = state[r*Nb+c];
for(int c=0;c state[r*Nb+c]=t[c];
}
}
/**
* This method is used to mix columns durying de-encrypt cyyptograph.
* @param state is a array which contains the cryptograph to de-encrypt.
* @param Nb the length of cryptograph block(32bits).
//////////////////////////////////////////////////////////////
功能：解密时的列混合变换；
入口参数：state为密文块；
Nb为密文块的大小；
//////////////////////////////////////////////////////////////
*/
public void InvMixColumns(char []state, int Nb)
{
char []t = new char[4];
for( int c=0;c {
for(int r=0;r<4;r++)t[r] = state[Nb*r+c];
for(int r=0;r<4;r++)
{
state[Nb*r+c] = (char)(Ffmul(0x0e,t[r])^Ffmul(0x0b,t[(r+1)%4])
^Ffmul(0x0d,t[(r+2)%4])^Ffmul(0x09,t[(r+3)%4]));
}
}
}
/**
* This method is used to transform a array from byte type to char type.
* @param data a byte type array.
* @return a char type array.
*/
public static char[] ByteToChar(byte[] data)
{
char []A = new char[data.length];
for(int i = 0;i A[i] = (char)data[i];
return A;
}
/**
* This method is used to transform a array from char type to byte type.
* @param data a char type array.
* @return a byte type array.
*/
public static byte[]CharToByte(char[]data)
{
byte[] A = new byte[data.length];
for(int i = 0;i A[i] = (byte)data[i];
return A;
}
}
package myLib.AES;
import java.io.IOException;
public class TestAes {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
AES test = new AES();
System.out.println(test.S_BOX.length);
//(String OpenPath,String SavePath,String m_Key,int Nb,int Nk)
long time = System.currentTimeMillis();
try{
test.AES_Encrypt("G:\\1.mkv","G:\\mkv.txt","1985012619850126",4,4);
test.AES_DeEncrypt("G:\\mkv.txt","G:\\DE.mkv","1985012619850126",4,4);
}catch(IOException e){System.out.println(e);}
long time1 = System.currentTimeMillis();
time = time1-time;
System.out.println(time);
}
}
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