aes.java

AES C++加密解密和java版加密解密方法

	            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<Nb;c++)t[c]= state[Nb*r+(r+c)%Nb];
	             for(int c=0;c<Nb;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<Nb;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<Nb;c++,round++)
	       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<Nr;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<Nb;c++)
	                 t[(c+r)%Nb] = state[r*Nb+c];
	             for(int c=0;c<Nb;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<Nb;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<data.length;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<data.length;i++)
	        A[i] = (byte)data[i];
	    return A;
	}
	
	public static void main(String[] args)  {
		
		
	}

}