java实现AES加密和解密

1、Java实现AES加密和解密经过三周的不懈努力，终于完成了 AES对任意格式的文件加密和解 密。现在将自己的学习经历记下来，纪念自己三周的付出。同时也感 谢网上的各位大神的博客，让我学到了很多。下面就将AES的各个构件的核心代码粘贴如下，每行代码都有详细的 注释！package myAes;/*本类完成AES的加密和解密的流程/内容参考：* */public class myAes private byte State口口;明文的状态表private byte Sbox口口; S 盒子private byte iSbox口口;逆 S盒子private byte key口;密钥private i

2、nt Nk;/密钥长度private int Nr;/ 对不同的长度的密钥不同的轮数private byte w;/ 密钥调度表private byte Rcon口口;轮常数表private int Nb;明文列数/构造函数public myAes(byte口 keyBytes,int keySize) =4;/只处理明文是128位为一组if(keySize=128)=4;=10;else if (keySize=192) /密钥长度位192位);二6;=12;else if (keySize=256) 二8;二14;二 new byte * 4;二 keyBytes;createSbox()

3、;/创建S盒子的方法createISbox();/ 创建S逆盒子的方法createRcon(); 创建轮常数数组的方法keyExtend();/ 密钥扩展的方法/初始化S盒子private void createSbox() =new byte口 0 x63, 0 x7c, 0 x77, 0 x7b, (byte) 0 xf2, 0 x6b, 0 x6f,(byte) 0 xc5, 0 x30, 0 x01, 0 x67, 0 x2b, (byte) 0 xfe,(byte) 0 xd7, (byte) 0 xab, 0 x76 , (byte) 0 xca, (byte) 0 x82, (b

4、yte) 0 xc9, 0 x7d,(byte) 0 xfa, 0 x59, 0 x47, (byte) 0 xf0, (byte) 0 xad,(byte) 0 xd4, (byte) 0 xa2, (byte) 0 xaf, (byte) 0 x9c,(byte) 0 xa4, 0 x72, (byte) 0 xc0 , (byte) 0 xb7, (byte) 0 xfd, (byte) 0 x93, 0 x26, 0 x36, 0 x3f, (byte) 0 xf7, (byte) 0 xcc, 0 x34, (byte) 0 xa5,(byte) 0 xe5, (byte) 0 xf

5、1,0 x71, (byte) 0 xd8, 0 x31,0 x15 ,0 x04, (byte) 0 xc7, 0 x23, (byte) 0 xc3, 0 x18,(byte) 0 x96, 0 x05, (byte) 0 x9a, 0 x07, 0 x12,(byte) 0 x80, (byte) 0 xe2, (byte) 0 xeb, 0 x27,(byte) 0 xb2, 0 x75 , 0 x09, (byte) 0 x83, 0 x2c, 0 x1a, 0 x1b, 0 x6e, 0 x5a,(byte) 0 xa0, 0 x52, 0 x3b, (byte) 0 xd6, (

6、byte) 0 xb3,0 x29, (byte) 0 xe3, 0 x2f, (byte) 0 x84 , 0 x53, (byte) 0 xd1,0 x00, (byte) 0 xed, 0 x20,(byte) 0 xfc, (byte) 0 xb1,0 x5b, 0 x6a, (byte) 0 xcb,(byte) 0 xbe, 0 x39, 0 x4a, 0 x4c, 0 x58, (byte) 0 xcf , (byte) 0 xd0, (byte) 0 xef, (byte) 0 xaa, (byte) 0 xfb,0 x43, 0 x4d, 0 x33, (byte) 0 x8

7、5, 0 x45, (byte) 0 xf9, 0 x02,0 x7f, 0 x50, 0 x3c, (byte) 0 x9f, (byte) 0 xa8 , 0 x51, (byte) 0 xa3, 0 x40, (byte) 0 x8f, (byte) 0 x92,(byte) 0 x9d, 0 x38, (byte) 0 xf5, (byte) 0 xbc, (byte) 0 xb6, (byte) 0 xda, 0 x21, 0 x10, (byte) 0 xff,(byte) 0 xf3, (byte) 0 xd2 , (byte) 0 xcd, 0 x0c, 0 x13, (byt

8、e) 0 xec, 0 x5f,(byte) 0 x97, 0 x44, 0 x17, (byte) 0 xc4, (byte) 0 xa7,0 x7e, 0 x3d, 0 x64, 0 x5d, 0 x19, 0 x73 , 0 x60, (byte) 0 x81,0 x4f, (byte) 0 xdc, 0 x22, 0 x2a,(byte) 0 x90, (byte) 0 x88, 0 x46, (byte) 0 xee,(byte) 0 xb8, 0 x14, (byte) 0 xde, 0 x5e, 0 x0b, (byte) 0 xdb , (byte) 0 xe0, 0 x32,

9、 0 x3a, 0 x0a, 0 x49, 0 x06, 0 x24, 0 x5c,(byte) 0 xc2, (byte) 0 xd3, (byte) 0 xac, 0 x62,(byte) 0 x91, (byte) 0 x95, (byte) 0 xe4, 0 x79 , (byte) 0 xe7, (byte) 0 xc8, 0 x37, 0 x6d, (byte) 0 x8d,(byte) 0 xd5, 0 x4e, (byte) 0 xa9, 0 x6c, 0 x56,(byte) 0 xf4, (byte) 0 xea, 0 x65, 0 x7a, (byte) 0 xae, 0

10、 x08 , (byte) 0 xba, 0 x78, 0 x25, 0 x2e, 0 x1c, (byte) 0 xa6, (byte) 0 xb4, (byte) 0 xc6, (byte) 0 xe8, (byte) 0 xdd,0 x74, 0 x1f, 0 x4b, (byte) 0 xbd, (byte) 0 x8b, (byte) 0 x8a , 0 x70, 0 x3e, (byte) 0 xb5, 0 x66, 0 x48, 0 x03,(byte) 0 xf6, 0 x0e, 0 x61, 0 x35, 0 x57, (byte) 0 xb9,(byte) 0 x86, (

11、byte) 0 xc1, 0 x1d, (byte) 0 x9e , (byte) 0 xe1, (byte) 0 xf8, (byte) 0 x98, 0 x11, 0 x69,(byte) 0 xd9, (byte) 0 x8e, (byte) 0 x94, (byte) 0 x9b,0 x1e, (byte) 0 x87, (byte) 0 xe9, (byte) 0 xce, 0 x55,0 x28, (byte) 0 xdf , (byte) 0 x8c, (byte) 0 xa1, (byte) 0 x89, 0 x0d,(byte) 0 xbf, (byte) 0 xe6, 0

12、x42, 0 x68, 0 x41,(byte) 0 x99, 0 x2d, 0 x0f, (byte) 0 xb0, 0 x54,(byte) 0 xbb, 0 x16 ;/*生成S逆盒子：我的思路：得到s盒中一个元素的高四位和低四位，分别作为盒子的行和列。然后在把s盒中的行和列转换成十六进制存到s逆盒中。*/private void createISbox() int x, y;=new byte1616;for (int i = 0; i 16; i+) for (int j = 0; j 4) & 0 x0f);/得到s盒子元素中的低四位的值y = (int)皿& 0 x0f);高四位

13、和低四位分别做为s逆盒子的行和列，将s盒子的行和列变 成十六进制放到s逆盒子中xy = (byte) (16 * i + j);/初始化Rcon轮常数二维数组private void createRcon() =new byte口 0 x00, 0 x00, 0 x00, 0 x00 , 0 x01, 0 x00, 0 x00, 0 x00 , 0 x02, 0 x00, 0 x00, 0 x00 , 0 x04, 0 x00, 0 x00, 0 x00 , 0 x08, 0 x00, 0 x00, 0 x00 , 0 x10, 0 x00, 0 x00, 0 x00 , 0 x20, 0 x

14、00, 0 x00, 0 x00 , 0 x40, 0 x00, 0 x00, 0 x00 , (byte) 0 x80, 0 x00, 0 x00, 0 x00 , 0 x1B, 0 x00, 0 x0, 0 x00 , 0 x36, 0 x00, 0 x00, 0 x00 ,;/* RotWord方法：将密钥wi-1的四个字节循环左移位,*返回移位后的结果。* */private byte口 RotWord(byte rotWord) byte口 b = new byte4;b0 = rotWord1;b1 = rotWord2;b2 = rotWord3;b3 = rotWord0;re

15、turn b;/* SubWord方法：将密钥wi-1的四个字节分别用S盒子的内容进 行替换返回替换后的结果。*/private byte口 SubWord(byte口 subWord) for (int i = 0; i 4 & 0 x0f)(subWordi & 0 x0f);return subWord;/*扩展密钥的方法private void keyExtend() =new byteNb * (Nr + 1)4;for (int i = 0; i Nk; i+) i0 = 4 * i；i1 = 4 * i + 1;i2 = 4 * i + 2;i3 = 4 * i + 3;/对轮密

16、钥十六进制输出/*，w+i+：);for(int j=0;j=3;j+)%x,wij);!l .*/byte口 temp = new byte4;for (int i = Nk; i 6 & (i % Nk = 4) temp = SubWord(temp);i0 = (byte) i - Nk0八 temp0);i1 = (byte) i - Nk1八 temp1);i2 = (byte) i - Nk2八 temp2);i3 = (byte) i - Nk3八 temp3);/对轮密钥十六进制输出/*w+i+：)；for(int j=0;j=3;j+)%x,wij)；!l .*/;/byt

17、e数组转换成String输出。即到时候在前台输出密钥扩展的内 容public static String BytesToString(String w,byte口 b)String s =;for (int i = 0; i ; i+)String hex = (bi & 0 xFF);if () = 1)hex = 0+hex+n.elsehex=hex+s+=hex;s=w+ +s;return s;/*以下是加密过程的每个方法/轮加密private void addRoundKey(int round) for (int r = 0; r 4; r+) for (int c = 0; c

18、 Nb; c+) rc = (byte) rc八 wround * Nb + cr);/字节替换private void subByte() for (int r = 0; r 4; r+) for (int c = 0; c 4) & 0 x0frc & 0 x0f);/逆字节替换private void invSubByte() for (int r = 0; r 4; r+) for (int c = 0; c 4) & 0 x0frc & 0 x0f);/行移位 private void shiftRow() byte temp = new byte4Nb;for (int r = 0

19、; r 4; r+) for (int c = 0; c Nb; c+) temprc = rc;/开始移位for (int r = 1; r 4; r+) for (int c = 0; c Nb; c+) rc = tempr(r + c) % Nb;/逆行移位private void invShiftRow() byte temp = new byte4Nb;for (int r = 0; r 4; r+) for (int c = 0; c Nb; c+) temprc = rc;/开始移位for (int c = 0; c Nb; c+) rc = tempr(c - r + Nb)

20、 % Nb;/列混合private void mixColum() byte口 temp = new byte4Nb;for (int r = 0; r 4; r+) for (int c = 0; c Nb; c+) temprc = rc;for (int c = 0; c Nb; c+) 0c = (byte) (mult2(temp0c)八 multBy03(temp1c)八 mult1(temp2c) mult1(temp3c);1c = (byte) (mult1(temp0c)八 mult2(temp1c)八 multBy03(temp2c) mult1(temp3c);2c =

21、 (byte) (mult1(temp0c)八 mult1(temp1c)八 mult2(temp2c)八multBy03(temp3c);3c = (byte) (multBy03(temp0c)八 mult1(temp1c) 八 mult1(temp2c) 八 mult2(temp3c);/逆列混合private void invMixColum()byte口 temp = new byte4Nb;for (int r = 0; r 4; r+) for (int c = 0; c Nb; c+) temprc = rc; for (int c = 0; c 7 & 0 x01)= 0)

22、/若字节最高位为0,则就是将b左移1位return (byte) (b 1); else byte c = 0 x1b;return (byte) (b 1)八 c);/字节*03的结果，相当于b* (02+01)。后面的方法类似private byte multBy03(byte b) return (byte) (mult2(b)八 mult1(b);/字节b*09的结果private byte multBy09(byte b) return (byte) (mult2(mult2(mult2(b)八 mult1(b);/字节*0b的结果private byte multBy0b(byte b) return (byte) (mult2(mult2(mult2(b) 八 mult2(b)八 mult1(b);/字节*0d的结果private byte multBy0d(byte b) return (byte) (mult2(mult2(mult2(b)八 mult2(mult2(b) mult1(b);/字节*0e的结果private byte multBy0e(byte b) return (byte) (mult2(mult2(mult2(b)八 mult2(mult2