本文详细介绍了如何使用Java实现AES算法，并通过示例展示了加密与解密的过程。主要内容包括算法类的实现、密钥扩展、字节操作等关键步骤。
工作需要，花了两个下午将Aes算法了解了一下并用java实现了一遍（此处借鉴了老外的C#的实现），本人非信息安全专业和软件，代码还有漏洞，欢迎指出~~~
先贴上代码：=================================================AES.java主要的类实现====================================================
package aesHelper.Aes;
/**
* AES字节数组加密算法类
*
* @author DC 2011/11/5
*/
public class Aes
{
/*************************** 成员变量 ************************************/
private int Nb;// 以32位为单位的字长
private int Nk;// 以32位为单位的密钥长度
private int Nr;// 轮数
private byte[] key;// 密钥
private byte[][] Sbox;// S盒矩阵
private byte[][] iSbox;// s盒逆矩阵
private byte[][] w;// 密钥调度表
private byte[][] Rcon;// 轮常数表
private byte[][] State;// 状态矩阵
/**
* 构造方法
*
* @param keySize
* @param keyBytes
*/
public Aes(int keySize, byte[] keyBytes, int Nb)
{
SetNbNkNr(keySize, Nb);
this.key = new byte[this.Nk * 4];
this.key = keyBytes;
BuildSbox();
BuildInvSbox();
BuildRcon();
KeyExpansion();
}
/*************************** 私有方法 ************************************/
/**
* 生成Rcon轮常数矩阵
*/
private void BuildRcon()
{
// 0x00,0x01,0x02,0x04,
// 0x08,0x10,0x20,0x40,
// 0x80,0x1b,0x36,0x6c,
// 0xd8,0xab,0x4d,0x9a,
// 0x2f,0x5e,0xbc,0x63,
// 0xc6,0x97,0x35,0x6a,
// 0xd4,0xb3,0x7d,0xfa,
// 0xef,0xc5,0x91,0x39};
this.Rcon = new byte[100][4];
Rcon[0][0]=0x00;//Rcon[1][0]=0x01;
for(int i=1;i<100;i++)
{
Rcon[i][0]=gfmultby02(Rcon[i-1][0]);
}
}
/**
* 设置Nb,Nk,Nr
*
* @param keysize
*/
private void SetNbNkNr(int keysize, int Nb)
{
this.Nb = Nb;
switch (keysize)
{
case KEYSIZE.Bit128:
this.Nk = 4;
this.Nr = 10;
break;
case KEYSIZE.Bit192:
this.Nk = 6;
this.Nr = 12;
break;
case KEYSIZE.Bit256:
this.Nk = 8;
this.Nr = 14;
break;
}
}
/**
* 生成S盒矩阵
*/
private void BuildSbox()
{
this.Sbox = new byte[][] {
/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
/* 0 */{ 0x63, 0x7c, 0x77, 0x7b, (byte) 0xf2, 0x6b, 0x6f,
(byte) 0xc5, 0x30, 0x01, 0x67, 0x2b, (byte) 0xfe,
(byte) 0xd7, (byte) 0xab, 0x76 },
/* 1 */{ (byte) 0xca, (byte) 0x82, (byte) 0xc9, 0x7d,
(byte) 0xfa, 0x59, 0x47, (byte) 0xf0, (byte) 0xad,
(byte) 0xd4, (byte) 0xa2, (byte) 0xaf, (byte) 0x9c,
(byte) 0xa4, 0x72, (byte) 0xc0 },
/* 2 */{ (byte) 0xb7, (byte) 0xfd, (byte) 0x93, 0x26, 0x36,
0x3f, (byte) 0xf7, (byte) 0xcc, 0x34, (byte) 0xa5,
(byte) 0xe5, (byte) 0xf1, 0x71, (byte) 0xd8, 0x31, 0x15 },
/* 3 */{ 0x04, (byte) 0xc7, 0x23, (byte) 0xc3, 0x18,
(byte) 0x96, 0x05, (byte) 0x9a, 0x07, 0x12,
(byte) 0x80, (byte) 0xe2, (byte) 0xeb, 0x27,
(byte) 0xb2, 0x75 },
/* 4 */{ 0x09, (byte) 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a,
(byte) 0xa0, 0x52, 0x3b, (byte) 0xd6, (byte) 0xb3,
0x29, (byte) 0xe3, 0x2f, (byte) 0x84 },
/* 5 */{ 0x53, (byte) 0xd1, 0x00, (byte) 0xed, 0x20,
(byte) 0xfc, (byte) 0xb1, 0x5b, 0x6a, (byte) 0xcb,
(byte) 0xbe, 0x39, 0x4a, 0x4c, 0x58, (byte) 0xcf },
/* 6 */{ (byte) 0xd0, (byte) 0xef, (byte) 0xaa, (byte) 0xfb,
0x43, 0x4d, 0x33, (byte) 0x85, 0x45, (byte) 0xf9, 0x02,
0x7f, 0x50, 0x3c, (byte) 0x9f, (byte) 0xa8 },
/* 7 */{ 0x51, (byte) 0xa3, 0x40, (byte) 0x8f, (byte) 0x92,
(byte) 0x9d, 0x38, (byte) 0xf5, (byte) 0xbc,
(byte) 0xb6, (byte) 0xda, 0x21, 0x10, (byte) 0xff,
(byte) 0xf3, (byte) 0xd2 },
/* 8 */{ (byte) 0xcd, 0x0c, 0x13, (byte) 0xec, 0x5f,
(byte) 0x97, 0x44, 0x17, (byte) 0xc4, (byte) 0xa7,
0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73 },
/* 9 */{ 0x60, (byte) 0x81, 0x4f, (byte) 0xdc, 0x22, 0x2a,
(byte) 0x90, (byte) 0x88, 0x46, (byte) 0xee,
(byte) 0xb8, 0x14, (byte) 0xde, 0x5e, 0x0b, (byte) 0xdb },
/* a */{ (byte) 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c,
(byte) 0xc2, (byte) 0xd3, (byte) 0xac, 0x62,
(byte) 0x91, (byte) 0x95, (byte) 0xe4, 0x79 },
/* b */{ (byte) 0xe7, (byte) 0xc8, 0x37, 0x6d, (byte) 0x8d,
(byte) 0xd5, 0x4e, (byte) 0xa9, 0x6c, 0x56,
(byte) 0xf4, (byte) 0xea, 0x65, 0x7a, (byte) 0xae, 0x08 },
/* c */{ (byte) 0xba, 0x78, 0x25, 0x2e, 0x1c, (byte) 0xa6,
(byte) 0xb4, (byte) 0xc6, (byte) 0xe8, (byte) 0xdd,
0x74, 0x1f, 0x4b, (byte) 0xbd, (byte) 0x8b, (byte) 0x8a },
/* d */{ 0x70, 0x3e, (byte) 0xb5, 0x66, 0x48, 0x03,
(byte) 0xf6, 0x0e, 0x61, 0x35, 0x57, (byte) 0xb9,
(byte) 0x86, (byte) 0xc1, 0x1d, (byte) 0x9e },
/* e */{ (byte) 0xe1, (byte) 0xf8, (byte) 0x98, 0x11, 0x69,
(byte) 0xd9, (byte) 0x8e, (byte) 0x94, (byte) 0x9b,
0x1e, (byte) 0x87, (byte) 0xe9, (byte) 0xce, 0x55,
0x28, (byte) 0xdf },
/* f */{ (byte) 0x8c, (byte) 0xa1, (byte) 0x89, 0x0d,
(byte) 0xbf, (byte) 0xe6, 0x42, 0x68, 0x41,
(byte) 0x99, 0x2d, 0x0f, (byte) 0xb0, 0x54,
(byte) 0xbb, 0x16 } };
}
/**
* 生成逆s盒矩阵
*/
private void BuildInvSbox()
{
// this.Sbox = new byte[][] {};
// 0x52,0x09,0x6A,0xD5,0x30,0x36,0xA5,0x38,0xBF,0x40,0xA3,0x9E,0x81,0xF3,0xD7,0xFB,
// 0x7C,0xE3,0x39,0x82,0x9B,0x2F,0xFF,0x87,0x34,0x8E,0x43,0x44,0xC4,0xDE,0xE9,0xCB,
// 0x54,0x7B,0x94,0x32,0xA6,0xC2,0x23,0x3D,0xEE,0x4C,0x95,0x0B,0x42,0xFA,0xC3,0x4E,
// 0x08,0x2E,0xA1,0x66,0x28,0xD9,0x24,0xB2,0x76,0x5B,0xA2,0x49,0x6D,0x8B,0xD1,0x25,
// 0x72,0xF8,0xF6,0x64,0x86,0x68,0x98,0x16,0xD4,0xA4,0x5C,0xCC,0x5D,0x65,0xB6,0x92,
// 0x6C,0x70,0x48,0x50,0xFD,0xED,0xB9,0xDA,0x5E,0x15,0x46,0x57,0xA7,0x8D,0x9D,0x84,
// 0x90,0xD8,0xAB,0x00,0x8C,0xBC,0xD3,0x0A,0xF7,0xE4,0x58,0x05,0xB8,0xB3,0x45,0x06,
// 0xD0,0x2C,0x1E,0x8F,0xCA,0x3F,0x0F,0x02,0xC1,0xAF,0xBD,0x03,0x01,0x13,0x8A,0x6B,
// 0x3A,0x91,0x11,0x41,0x4F,0x67,0xDC,0xEA,0x97,0xF2,0xCF,0xCE,0xF0,0xB4,0xE6,0x73,
// 0x96,0xAC,0x74,0x22,0xE7,0xAD,0x35,0x85,0xE2,0xF9,0x37,0xE8,0x1C,0x75,0xDF,0x6E,
// 0x47,0xF1,0x1A,0x71,0x1D,0x29,0xC5,0x89,0x6F,0xB7,0x62,0x0E,0xAA,0x18,0xBE,0x1B,
// 0xFC,0x56,0x3E,0x4B,0xC6,0xD2,0x79,0x20,0x9A,0xDB,0xC0,0xFE,0x78,0xCD,0x5A,0xF4,
// 0x1F,0xDD,0xA8,0x33,0x88,0x07,0xC7,0x31,0xB1,0x12,0x10,0x59,0x27,0x80,0xEC,0x5F,
// 0x60,0x51,0x7F,0xA9,0x19,0xB5,0x4A,0x0D,0x2D,0xE5,0x7A,0x9F,0x93,0xC9,0x9C,0xEF,
// 0xA0,0xE0,0x3B,0x4D,0xAE,0x2A,0xF5,0xB0,0xC8,0xEB,0xBB,0x3C,0x83,0x53,0x99,0x61,
// 0x17,0x2B,0x04,0x7E,0xBA,0x77,0xD6,0x26,0xE1,0x69,0x14,0x63,0x55,0x21,0x0C,0x7D,
int x, y;
this.iSbox = new byte[16][16];
for (int i = 0; i < 16; i++)
{
// System.out.println("i="+i);
for (int j = 0; j < 16; j++)
{
x = (int) ((this.Sbox[i][j] >> 4) & 0x0f);
y = (int) (this.Sbox[i][j] & 0x0f);
// System.out.println("x="+x+" y="+y);
this.iSbox[x][y] = (byte) (16 * i + j);
}
}
}
/**
* 扩展密钥
*/
private void KeyExpansion()
{
this.w = new byte[Nb * (Nr + 1)][4];
for (int row = 0; row < Nk; ++row)
{
this.w[row][0] = this.key[4 * row];
this.w[row][1] = this.key[4 * row + 1];
this.w[row][2] = this.key[4 * row + 2];
this.w[row][3] = this.key[4 * row + 3];
}
byte[] temp = new byte[Nb];
for (int row = Nk; row < Nb * (Nr + 1); ++row)
{
temp[0] = this.w[row - 1][0];
temp[1] = this.w[row - 1][1];
temp[2] = this.w[row - 1][2];
temp[3] = this.w[row - 1][3];
if (row % Nk == 0)
{
temp = SubWord(RotWord(temp));
temp[0] = (byte) (temp[0] ^ this.Rcon[row / Nk][0]);
temp[1] = (byte) (temp[1] ^ this.Rcon[row / Nk][1]);
temp[2] = (byte) (temp[2] ^ this.Rcon[row / Nk][2]);
temp[3] = (byte) (temp[3] ^ this.Rcon[row / Nk][3]);
} else if (Nk > 6 && (row % Nk == 4))
{
temp = SubWord(temp);
}
this.w[row][0] = (byte) (this.w[row - Nk][0] ^ temp[0]);
this.w[row][1] = (byte) (this.w[row - Nk][1] ^ temp[1]);
this.w[row][2] = (byte) (this.w[row - Nk][2] ^ temp[2]);
this.w[row][3] = (byte) (this.w[row - Nk][3] ^ temp[3]);
}
}
/**
* SubWord方法
*
* @param subWord
* @return
*/
private byte[] SubWord(byte[] subWord)
{
for (int c = 0; c < subWord.length; ++c)
{
subWord[c] = this.Sbox[(subWord[c] >> 4) & 0x0f][(subWord[c] & 0x0f)];
}
return subWord;
}
/**
* RotWord方法
*
* @param rotWord
* @return
*/
private byte[] RotWord(byte[] rotWord)
{
byte[] temp = rotWord;
byte[] b = new byte[4];
for (int i = 0; i < 4; i++)
{
b[i] = temp[(i + 1) % 4];
}
return b;
}
/**
* 轮密钥加
*
* @param round
*/
private void AddRoundKey(int round)
{
for (int r = 0; r < 4; ++r)
{
for (int c = 0; c < Nb; ++c)
{
this.State[r][c] = (byte) (this.State[r][c] ^ w[(round * Nb)
+ c][r]);
}
}
}
/**
* SubBytes方法
*/
private void SubBytes()
{
for (int r = 0; r < 4; ++r)
{
for (int c = 0; c < Nb; ++c)
{
this.State[r][c] = this.Sbox[(this.State[r][c] >> 4) & 0x0f][(this.State[r][c] & 0x0f)];
}
}
}
/**
* InvSubBytes方法
*/
private void InvSubBytes()
{
for (int r = 0; r < 4; ++r)
{
for (int c = 0; c < Nb; ++c)
{
this.State[r][c] = this.iSbox[(this.State[r][c] >> 4) & 0x0f][(this.State[r][c] & 0x0f)];
}
}
}
/**
* 行移位
*/
private void ShiftRows()
{
byte[][] temp = new byte[4][Nb];
for (int r = 0; r < 4; ++r)
{
for (int c = 0; c < Nb; ++c)
{
temp[r][c] = this.State[r][c];
}
}
for (int r = 1; r < 4; ++r)
{
for (int c = 0; c < Nb; ++c)
{
this.State[r][c] = temp[r][(c + r) % Nb];
}
}
// System.out.println();
// for (int r = 0; r < 4; r++)
// {
// for (int c = 0; c < 4; c++)
// {
// System.out.print(State[r][c]+" ");
// }
// System.out.println();
// }
//
}
/**
* 逆行移位
*/
private void InvShiftRows()
{
byte[][] temp = new byte[4][Nb];
for (int r = 0; r < 4; ++r)
{
for (int c = 0; c < Nb; ++c)
{
temp[r][c] = this.State[r][c];
}
}
for (int r = 1; r < 4; ++r)
{
for (int c = 0; c < Nb; ++c)
{
this.State[r][c] = temp[r][(c - r + Nb) % Nb];
}
}
// System.out.println();
// for (int r = 0; r < 4; ++r)
// {
// for (int c = 0; c < 4; ++c)
// {
// System.out.print(this.State[r][c] + " ");
// }
// System.out.println();
// }
}
/**
* 列混合
*/
private void MixColumns()
{
byte[][] temp = new byte[4][Nb];
for (int r = 0; r < 4; ++r)
{
for (int c = 0; c < Nb; ++c)
{
temp[r][c] = this.State[r][c];
}
}
for (int c = 0; c < Nb; ++c)
{
this.State[0][c] = (byte) (gfmultby02(temp[0][c])
^ gfmultby03(temp[1][c]) ^ gfmultby01(temp[2][c]) ^ gfmultby01(temp[3][c]));
this.State[1][c] = (byte) (gfmultby01(temp[0][c])
^ gfmultby02(temp[1][c]) ^ gfmultby03(temp[2][c]) ^ gfmultby01(temp[3][c]));
this.State[2][c] = (byte) (gfmultby01(temp[0][c]) ^ (gfmultby01(temp[1][c])
^ gfmultby02(temp[2][c]) ^ gfmultby03(temp[3][c])));
this.State[3][c] = (byte) (gfmultby03(temp[0][c])
^ gfmultby01(temp[1][c]) ^ (gfmultby01(temp[2][c]) ^ gfmultby02(temp[3][c])));
}
}
/**
* 逆列混合
*/
private void InvMixColumns()
{
byte[][] temp = new byte[4][Nb];
for (int r = 0; r < 4; ++r)
{
for (int c = 0; c < Nb; ++c)
{
temp[r][c] = this.State[r][c];
}
}
for (int c = 0; c < Nb; c++)
{
this.State[0][c] = (byte) (gfmultby0e(temp[0][c])
^ gfmultby0b(temp[1][c]) ^ gfmultby0d(temp[2][c]) ^ gfmultby09(temp[3][c]));
this.State[1][c] = (byte) (gfmultby09(temp[0][c])
^ gfmultby0e(temp[1][c]) ^ gfmultby0b(temp[2][c]) ^ gfmultby0d(temp[3][c]));
this.State[2][c] = (byte) (gfmultby0d(temp[0][c]) ^ (gfmultby09(temp[1][c])
^ gfmultby0e(temp[2][c]) ^ gfmultby0b(temp[3][c])));
this.State[3][c] = (byte) (gfmultby0b(temp[0][c])
^ gfmultby0d(temp[1][c]) ^ (gfmultby09(temp[2][c]) ^ gfmultby0e(temp[3][c])));
}
}
// 有限域GF(28)部分变换
private byte gfmultby01(byte b)
{
return b;
}
private byte gfmultby02(byte b)
{
// if (b < 0x80 && b >= 0) // !!!!!!!这里比较大小的时候注意符号位
// return (byte) (b << 1);
// else
// return (byte) ((b << 1) ^ (byte) 0x1b);
if (((b >> 7) & 0x01) == 0) // !!!!!!!这里比较大小的时候注意符号位
return (byte) (b << 1);
else
return (byte) ((b << 1) ^ (byte) 0x1b);
// 消除符号位可以用b&0xff
}
private byte gfmultby03(byte b)
{
return (byte) (gfmultby02(b) ^ gfmultby01(b));
}
private byte gfmultby09(byte b)
{
return (byte) (gfmultby02(gfmultby02(gfmultby02(b))) ^ gfmultby01(b));
}
private byte gfmultby0b(byte b)
{
return (byte) (gfmultby02(gfmultby02(gfmultby02(b))) ^ gfmultby02(b) ^ gfmultby01(b));
}
private byte gfmultby0d(byte b)
{
return (byte) (gfmultby02(gfmultby02(gfmultby02(b)))
^ gfmultby02(gfmultby02(b)) ^ gfmultby01(b));
}
private byte gfmultby0e(byte b)
{
return (byte) (gfmultby02(gfmultby02(gfmultby02(b)))
^ gfmultby02(gfmultby02(b)) ^ gfmultby02(b));
}
/*************************** 公有方法 ************************************/
/**
* 加密过程
*
* @param input
* @param output
*/
public void Cipher(byte[] input, byte[] output)
{
this.State = new byte[4][Nb];
for (int i = 0; i < (4 * Nb); i++)
{
this.State[i / Nb][i % Nb] = input[i];
}// 初始化状态矩阵
AddRoundKey(0);// 轮密钥加
for (int round = 1; round < Nr; ++round)
{
SubBytes();// S盒变换
ShiftRows();// 行移位
MixColumns();// 列混合
AddRoundKey(round);
}
SubBytes();// S盒置换
ShiftRows();// 行移位
AddRoundKey(Nr);// 轮密钥加
for (int i = 0; i < (4 * Nb); i++)
{
output[i] = this.State[i / Nb][i % Nb];
// System.out.println((i%Nb));
}// 输出密文
}
public void Cipher(String input, String output)
{
}
/**
* 解密过程
*
* @param inputs
* @param output
*/
public void Invcipher(byte[] input, byte[] output)
{
this.State = new byte[4][Nb];
for (int i = 0; i < (4 * Nb); ++i)
{
this.State[i / Nb][i % Nb] = input[i];
}// 初始化状态矩阵
AddRoundKey(Nr);// 轮密钥加
for (int round = Nr - 1; round > 0; round--)
{
InvShiftRows();// 逆行移位
InvSubBytes();// 逆S盒置换
AddRoundKey(round);// 轮密钥加
InvMixColumns();// 逆列混合
}
InvShiftRows();// 逆行移位
InvSubBytes();// 逆S盒置换
AddRoundKey(0);// 轮密钥加
for (int i = 0; i < (4 * Nb); ++i)
{
output[i] = this.State[i / Nb][i % Nb];
}// 输出结果
}
}
package aesHelper.Aes;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
/**
* 辅助类 处理明文字符输入字节数不匹配等问题
*
* @author DC
*
*/
public class AesCipherAndInvCipher
{
private byte[] key;// 密钥
private byte[] pt;// 明文字节数组
private byte[] ct;
private int mode;
private int Nb = 0;
private int dataLength;
private int blockSize = 4;// 分组大小32位,4bytes
public AesCipherAndInvCipher(byte[] kb)
{
this.key=kb;
}
/**
* 加密
*
* @param kb
* @param plainText
* @return 加密后密文字节数组
*/
private byte[] Eecrypt(String plainText, byte[] kb) throws InvalidKeyException
{
try
{
pt = plainText.getBytes("UTF-8");// 获取明文字节数组
//System.out.println("明文字节数组：");
//DisplayAsBytes(pt);
} catch (UnsupportedEncodingException e)
{
System.out.println("不支持的编码类型！");
e.printStackTrace();
}
dataLength = pt.length;
// System.out.println(dataLength);
mode = dataLength % blockSize;// 判断明文数组长度是否与分组长度匹配
ct = new byte[mode == 0 ? pt.length : dataLength / blockSize * 4 + 32];// 密文字节数组
Nb = dataLength / blockSize;
// System.out.println(ct.length);
Aes a1 = new Aes(KEYSIZE.Bit192, kb, Nb);
Aes a2 = new Aes(KEYSIZE.Bit192, kb, 4);
Aes a3 = new Aes(KEYSIZE.Bit192, kb, 4);
if (mode == 0)
{
a1.Cipher(pt, ct);
} else
{
//System.out.println("长度不匹配");
byte[] b1 = new byte[blockSize * Nb];// 匹配的部分
//System.out.println(blockSize * Nb);
byte[] b2 = new byte[16];// 剩余部分
byte[] b3 = new byte[16];// 存明文长度
byte[] c1 = new byte[b1.length];
byte[] c2 = new byte[b2.length];
byte[] c3 = new byte[b3.length];
System.arraycopy(pt, 0, b1, 0, b1.length);
// System.out.println("匹配明文字节数组：");
// DisplayAsBytes(b1);
System.arraycopy(pt, Nb * blockSize, b2, 0, mode);
b3 = intToByteArray(dataLength);
// System.out.println(ct.length);
a1.Cipher(b1, c1);
//System.out.println("c1：");
//DisplayAsBytes(c1);
// DisplayAsBytes(b3);
a2.Cipher(b2, c2);
a3.Cipher(b3, c3);
System.arraycopy(c1, 0, ct, 0, c1.length);
System.arraycopy(c2, 0, ct, b1.length, c2.length);
System.arraycopy(c3, 0, ct, b1.length + b2.length, c3.length);
}
return ct;
}
public byte[] EecryptToBytes(String plainText, byte[] kb) throws InvalidKeyException
{
byte[] ct=Eecrypt(plainText,kb);
return ct;
}
public String EecryptToString(String plainText, byte[] kb) throws InvalidKeyException
{
byte[] ct = Eecrypt(plainText,kb);
//System.out.println("密文："+BytesToString(ct));
return BytesToString(ct);
}
/**
* 解密
*/
public String Decrypt(byte[] ct,byte[] kb)
{
String s="";
if (mode == 0)
{
byte[] output = new byte[dataLength];
Aes a = new Aes(KEYSIZE.Bit192, kb, Nb);
a.Invcipher(ct, output);
try
{
s = new String(output, "UTF-8");
System.out.println("解密：" + s);
} catch (UnsupportedEncodingException e)
{
System.out.println("不支持的编码格式！");
e.printStackTrace();
}
} else
{
byte[] length = new byte[16];
byte[] plainText1 = new byte[ct.length - 32];
byte[] plainText2 = new byte[16];
Aes a1 = new Aes(KEYSIZE.Bit192, kb, Nb);
Aes a2 = new Aes(KEYSIZE.Bit192, kb, 4);
Aes a3 = new Aes(KEYSIZE.Bit192, kb, 4);
byte[] c1 = new byte[ct.length - 32];
byte[] c2 = new byte[16];
byte[] c3 = new byte[16];
System.arraycopy(ct, ct.length - 16, c3, 0, c3.length);
System.arraycopy(ct, ct.length - 32, c2, 0, c2.length);
System.arraycopy(ct, 0, c1, 0, Nb * blockSize);
//System.out.println("密文匹配部分c1:");
//DisplayAsBytes(c1);
a3.Invcipher(c3, length);// 解密明文字节数组长度
a2.Invcipher(c2, plainText2);// 解密剩余的部分
a1.Invcipher(c1, plainText1);// 解密匹配的部分
// System.out.println(plainText1.length);
//System.out.println("解密后字节数组长度：");
//DisplayAsBytes(length);
//System.out.println("解密后匹配部分：");
//DisplayAsBytes(plainText1);
//System.out.println("解密后剩余部分：");
//DisplayAsBytes(plainText2);
// DisplayAsBytes(output);
// int length;
int length1 = byteArrayToInt(length);
//System.out.println("\n解密长度后：" + length1);
byte[] output = new byte[length1];
System.arraycopy(plainText1, 0, output, 0, plainText1.length);
System.arraycopy(plainText2, 0, output, plainText1.length, length1
- plainText1.length);
//System.out.println("解密后字节数组：");
//DisplayAsBytes(output);
try
{
s = new String(output, "UTF-8");
System.out.println("解密后明文：" + s);
} catch (UnsupportedEncodingException e)
{
System.out.println("不支持的编码格式！");
e.printStackTrace();
}
}
return s;
}
public String Decrypt(String cryptText,byte[] kb)
{
//System.out.println(cryptText+" "+cryptText.length());
byte[] ct=StringToBytes(cryptText);
//DisplayAsBytes(ct);
return Decrypt(ct,kb);
}
public String Decrypt(Byte[] ct,byte[] kb)
{
return Decrypt(ct,kb);
}
/**
* int转化为Byte数组
*
* @param value
* @return
*/
private static byte[] intToByteArray(int value)
{
byte[] b = new byte[16];
for (int i = 0; i < 4; i++)
{
int offset = (b.length - 1 - i) * 8;
b[i] = (byte) ((value >>> offset) & 0xFF);
}
for (int i = 4; i < 16; i++)
{
b[i] = 0;
}
return b;
}
/**
* byte数组转化为int
*
* @param b
* @return
*/
private static final int byteArrayToInt(byte[] b)
{
byte[] b1 = new byte[4];
System.arraycopy(b, 0, b1, 0, 4);
//DisplayAsBytes(b1);
//System.out.println(b1[0] << 24);
return (b1[0] << 24) + ((b1[1] & 0xFF) << 16) + ((b1[2] & 0xFF) << 8)
+ (b1[3] & 0xFF);
// targets[0] = (byte) (res & 0xff);// 最低位
// targets[1] = (byte) ((res >> 8) & 0xff);// 次低位
// targets[2] = (byte) ((res >> 16) & 0xff);// 次高位
// targets[3] = (byte) (res >>> 24);// 最高位,无符号右移。
// return targets;
}
/**
* 显示字节数组
*
* @param b
*/
private static void DisplayAsBytes(byte[] b)
{
for (int i = 0; i < b.length; i++)
{
String hex = Integer.toHexString(b[i] & 0xFF);
if (hex.length() == 1)
{
hex = '0' + hex;
}
System.out.print(hex.toUpperCase() + " ");
}
System.out.println();
}
private static String BytesToString(byte[] b)
{
String s = "";
for (int i = 0; i < b.length; i++)
{
String hex = Integer.toHexString(b[i] & 0xFF);
if (hex.length() == 1)
{
hex = '0' + hex;
}
s+=hex;
}
return s;
}
private static byte[] StringToBytes(String cryptText)
{
byte[] b=new byte[cryptText.length()/2];
int[] a=new int[cryptText.length()];
for(int i=0;i<cryptText.length();++i)
{
String s=cryptText.substring(i, i+1);
//System.out.print(i);
if(s.equals("a"))
a[i]=10;
else if(s.equals("b"))
a[i]=11;
else if(s.equals("c"))
a[i]=12;
else if(s.equals("d"))
a[i]=13;
else if(s.equals("e"))
a[i]=14;
else if(s.equals("f"))
a[i]=15;
else
a[i]=Integer.valueOf(s);
}
for(int i=0;i<cryptText.length()/2;i++)
{
b[i]=(byte) (a[2*i]*16+a[2*i+1]);
}
return b;
}
}
======================================================generateKey.java================================================
package aesHelper.Aes;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.util.Random;
public class generateKey
{
private static byte[] key;
/**
* 随机生成key
* @param keySize
* @return
* @throws InvalidKeyException
*/
public static byte[] generateRandomKey(int keySize) throws InvalidKeyException
{
if (keySize == KEYSIZE.Bit128 | keySize == KEYSIZE.Bit192
| keySize == KEYSIZE.Bit256)
{
key = new byte[keySize / 8];
for (int i = 0; i < keySize / 8; i++)
{
Random r = new Random();
int tempByte = r.nextInt() * 255;
key[i] = (byte) tempByte;
}
// DisplayAsBytes(key);
return key;
} else
{
throw new InvalidKeyException("密钥长度错误，正确长度为128,192或者256位！");
}
}
/**
* 根据字符串生成key
* @param keyStr
* @return
*/
public static byte[] generateKeyFromString(String keyStr)
{
byte[] tempkey=null;
try
{
tempkey = keyStr.getBytes("UTF-8");
} catch (UnsupportedEncodingException e)
{
System.out.println("不支持的编码类型！");
e.printStackTrace();
}
//System.out.println("\n密钥字节数组：" + key);
if(tempkey.length<128)
{
key=new byte[16];
byte lastByte=tempkey[tempkey.length-1];
for(int i=tempkey.length;i<16;i++)
{
key[i]=gfmultby02(lastByte);
lastByte=key[i-1];
}
//DisplayAsBytes(key);
}
else if(tempkey.length>128&&tempkey.length<192)
{
key=new byte[24];
byte lastByte=tempkey[tempkey.length-1];
for(int i=tempkey.length;i<24;i++)
{
key[i]=gfmultby02(lastByte);
lastByte=key[i-1];
}
//DisplayAsBytes(key);
}
else if(tempkey.length>192&&tempkey.length<256)
{
key=new byte[32];
byte lastByte=tempkey[tempkey.length-1];
for(int i=tempkey.length;i<32;i++)
{
key[i]=gfmultby02(lastByte);
lastByte=key[i-1];
}
//DisplayAsBytes(key);
}
else if(tempkey.length>256)
{
key=new byte[32];
System.arraycopy(tempkey, 0, key, 0, 32);
}
else
{
key=tempkey;
}
return key;
}
public int getKeyLength()
{
return key.length;
}
private static byte gfmultby02(byte b)
{
// if (b < 0x80 && b >= 0) // !!!!!!!这里比较大小的时候注意符号位
// return (byte) (b << 1);
// else
// return (byte) ((b << 1) ^ (byte) 0x1b);
if (((b >> 7) & 0x01) == 0) // !!!!!!!这里比较大小的时候注意符号位
return (byte) (b << 1);
else
return (byte) ((b << 1) ^ (byte) 0x1b);
// 消除符号位可以用b&0xff
}
// public static void DisplayAsBytes(byte[] b)
// {
// for (int i = 0; i < b.length; i++)
// {
// String hex = Integer.toHexString(b[i] & 0xFF);
// if (hex.length() == 1)
// {
// hex = '0' + hex;
// }
// System.out.print(hex.toUpperCase() + " ");
// }
// System.out.println();
// }
}
====================================================KEYSIZE.java=================================================
package aesHelper.Aes;
/**
* 密钥长度
*
* @author DC
*/
public class KEYSIZE
{
public static final int Bit128 = 128;//128位
public static final int Bit192 = 192;//192位
public static final int Bit256 = 256;//256位
}
===============================================以下是代码测试部分========================================================
package aesHelper.Aes;
import java.security.InvalidKeyException;
/**
* AES算法测试
*
* @author DC
*
*/
public class testAes
{
public static void main(String[] args)
{
// *************************加密*******************************************
byte[] plainText = new byte[] { 0x11, 0x11, 0x22, 0x33, 0x44, 0x55,
0x66, 0x77, (byte) 0x88, (byte) 0x99, (byte) 0xaa, (byte) 0xbb,
(byte) 0xcc, (byte) 0xdd, (byte) 0xee, (byte) 0xff, 0x00, 0x11,// 0x22,
// 0x33,0x44,
// 0x55,
0x66, 0x77 };// 明文
byte[] cipherText = new byte[20];
byte[] decipheredText = new byte[20];
byte[] keyBytes = null;
try
{
keyBytes = generateKey.generateKeyFromString("段聪wrwe2432v112wwwwwwwwwwwwwwwwwwww@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@wwwwwwwwwwwwwwwwwwwwwww34@#%$1234fffffffffffffffffffffff");
} catch (Exception e1)
{
// TODO Auto-generated catch block
e1.printStackTrace();
}
// byte[] keyBytes = new byte[] { 0x23, 0x56, 0x02, 0x03, 0x04, 0x05,
// 0x06, 0x07, 0x08, 0x09, 0x0c, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
// 0x10, 0x11, 0x12, 0x13, 0x14, 0x51, 0x16, 0x17 };// 密钥
Aes a = new Aes(KEYSIZE.Bit192, keyBytes, 5);
// System.out.println("AES加密算法");
// System.out.println("明文: ");
// DisplayAsBytes(plainText);
// System.out.println("\n使用 " + KEYSIZE.Bit192 + "位的密钥: ");
// DisplayAsBytes(keyBytes);
// a.Cipher(plainText, cipherText);
// System.out.println("\n加密后的密文为: ");
// DisplayAsBytes(cipherText);
// String plainText1="dc";
// String cipherText1=null;
// Aes a = new Aes(KeySize.Bit192, keyBytes);
// System.out.println("AES加密算法");
// System.out.println("明文: ");
// System.out.println(plainText1);
// a.Cipher(plainText1, cipherText1);
// System.out.println("\n加密后的密文为: ");
// System.out.println(cipherText1);
// **************************解密*******************************************
// a.Invcipher(cipherText, decipheredText);
// System.out.println("\n解密出结果为: ");
// DisplayAsBytes(decipheredText);
// System.out.println("\n完成！");
System.out.println("***********************测试1****************************");
byte[] key1 = null;
try
{
key1 = generateKey.generateRandomKey(KEYSIZE.Bit192);
} catch (InvalidKeyException e1)
{
e1.printStackTrace();
}
AesCipherAndInvCipher aes = new AesCipherAndInvCipher(key1);
byte[] dt = null;
String ss = null;
try
{
dt = new byte[16];
dt = aes.EecryptToBytes("段聪wrwe2432v1343", keyBytes);
ss = aes.EecryptToString("段聪wrwe2432v1343", keyBytes);
System.out.println("明文：段聪wrwe2432v1343");
} catch (InvalidKeyException e)
{
e.printStackTrace();
}
aes.Decrypt(dt, keyBytes);
aes.Decrypt(ss, keyBytes);
System.out.println("*************************测试2*****************************");
AesCipherAndInvCipher aes1 = new AesCipherAndInvCipher(key1);
byte[] dt1 = null;
try
{
// dt = new byte[16];
String plainText1 = "uuid=FSFASW24S-0342-FEW3-3F33-F44F2SE523432D";
dt1 = aes1.EecryptToBytes(plainText1, keyBytes);
System.out.println("明文：" + plainText1);
} catch (InvalidKeyException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
//System.out.println("加密后字节数组：");
//DisplayAsBytes(dt1);// 加密后字节数组
aes1.Decrypt(dt1, keyBytes);
// generateKey.generateRandomKey("dc");
}
/**
* 显示16进制
*
* @param b
*/
public static void DisplayAsBytes(byte[] b)
{
for (int i = 0; i < b.length; i++)
{
String hex = Integer.toHexString(b[i] & 0xFF);
if (hex.length() == 1)
{
hex = '0' + hex;
}
System.out.print(hex.toUpperCase() + " ");
}
System.out.println();
}
}
附录：
打包成AesHelper.jar后，可以进行以下调用：
System.out.println("******************************************************");
byte[] key1 = null;
try
{
key1 = generateKey.generateRandomKey(KEYSIZE.Bit192);
} catch (InvalidKeyException e1)
{
e1.printStackTrace();
}
AesCipherAndInvCipher aes = new AesCipherAndInvCipher(key1);
byte[] dt = null;
String ss = null;
try
{
dt = new byte[16];
dt = aes.EecryptToBytes("段聪wrwe2432v!!1343", key1);
ss = aes.EecryptToString("段聪wrwe2432v!!1343", key1);
System.out.println("明文：段聪wrwe2432v!!1343");
} catch (InvalidKeyException e)
{
e.printStackTrace();
}
aes.Decrypt(dt, key1);
aes.Decrypt(ss, key1);
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