首先准备好两个文本文件（plain.txt和cipher.txt），这里我准备加密《荷塘月色》这篇文章。
接下来是3个代码文件（AES.java,CBC.java,testCBC.java），一共5个文件放在同一目录下。接下来上代码：
AES.java如下：
package CBC;
public class AES {
private byte[] key=null;
private char[] ikey=null;
private byte[] plaintext=null;
private byte[] ciphertext= null;
private static char Rcon[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36};
private static char[] S= {
0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
};
private static char[] InvS= {
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
};
private static char x2time (char in)
{
char temp;
temp = (char) (in<<1);
if((in & 0x80)==0x80)
temp ^= 0x1b;
return (char) (temp&0xff);
}
private static char x3time(char in) {
return (char) (x2time(in)^in);
}
private static char x9time(char in) {
return (char) (x2time(x2time((char) x2time(in)))^in);
}
private static char xbtime(char in) {
return (char) (x2time(x2time(x2time(in)))^x2time(in)^in);
}
private static char xdtime(char in) {
return (char) (x2time(x2time(x2time(in)))^x2time(x2time(in))^in);
}
private static char xetime(char in) {
return (char) (x2time(x2time(x2time(in)))^x2time(x2time(in))^x2time(in));
}
public AES(String key) {
setKey(key);
setPlaintext(new byte[0]);
setCiphertext(new byte[0]);
}
public AES(byte[] key) {
setKey(key);
setPlaintext(new byte[0]);
setCiphertext(new byte[0]);
}
public AES() {
setKey(new byte[0]);
setPlaintext(new byte[0]);
setCiphertext(new byte[0]);
}
private void geneKey() {
int i,j;
this.ikey=new char[11*16];
char[] T=new char[4];
for(i=0;i<16;i++)
this.ikey[i]=(char)(this.key[i]&0xff);
for(i=4;i<44;i++) {
if(i%4==0) {
T[0]=(char) (S[this.ikey[4*i-3]]^Rcon[i/4-1]);
T[1]=(char) (S[this.ikey[4*i-2]]);
T[2]=(char) (S[this.ikey[4*i-1]]);
T[3]=(char) (S[this.ikey[4*i-4]]);
for(j=4*i;j<4*i+4;j++)
this.ikey[j]=(char) (this.ikey[j-16]^T[j%4]&0xff);
}else {
for(j=4*i;j<4*i+4;j++)
this.ikey[j]=(char) (this.ikey[j-16]^this.ikey[j-4]&0xff);
}
}
}
private byte[] EncryptRound(byte[] bin,int start) {
byte[] out=new byte[16];
char[] in=byteTochar(bin);
out[0]=(byte) (x2time(S[in[0]])^x3time(S[in[5]])^S[in[10]]^S[in[15]]^this.ikey[start]);
out[1]=(byte) (x2time(S[in[1]])^x3time(S[in[6]])^S[in[11]]^S[in[12]]^this.ikey[start+1]);
out[2]=(byte) (x2time(S[in[2]])^x3time(S[in[7]])^S[in[8]]^S[in[13]]^this.ikey[start+2]);
out[3]=(byte) (x2time(S[in[3]])^x3time(S[in[4]])^S[in[9]]^S[in[14]]^this.ikey[start+3]);
out[4]=(byte) (S[in[0]]^x2time(S[in[5]])^x3time(S[in[10]])^S[in[15]]^this.ikey[start+4]);
out[5]=(byte) (S[in[1]]^x2time(S[in[6]])^x3time(S[in[11]])^S[in[12]]^this.ikey[start+5]);
out[6]=(byte) (S[in[2]]^x2time(S[in[7]])^x3time(S[in[8]])^S[in[13]]^this.ikey[start+6]);
out[7]=(byte) (S[in[3]]^x2time(S[in[4]])^x3time(S[in[9]])^S[in[14]]^this.ikey[start+7]);
out[8]=(byte) (S[in[0]]^S[in[5]]^x2time(S[in[10]])^x3time(S[in[15]])^this.ikey[start+8]);
out[9]=(byte) (S[in[1]]^S[in[6]]^x2time(S[in[11]])^x3time(S[in[12]])^this.ikey[start+9]);
out[10]=(byte) (S[in[2]]^S[in[7]]^x2time(S[in[8]])^x3time(S[in[13]])^this.ikey[start+10]);
out[11]=(byte) (S[in[3]]^S[in[4]]^x2time(S[in[9]])^x3time(S[in[14]])^this.ikey[start+11]);
out[12]=(byte) (x3time(S[in[0]])^S[in[5]]^S[in[10]]^x2time(S[in[15]])^this.ikey[start+12]);
out[13]=(byte) (x3time(S[in[1]])^S[in[6]]^S[in[11]]^x2time(S[in[12]])^this.ikey[start+13]);
out[14]=(byte) (x3time(S[in[2]])^S[in[7]]^S[in[8]]^x2time(S[in[13]])^this.ikey[start+14]);
out[15]=(byte) (x3time(S[in[3]])^S[in[4]]^S[in[9]]^x2time(S[in[14]])^this.ikey[start+15]);
return out;
}
private byte[] EncryptLastRound(byte[] bin) {
char[] in=byteTochar(bin);
byte[] out=new byte[16];
out[0]=(byte) (S[in[0]]^this.ikey[160]);
out[1]=(byte) (S[in[1]]^this.ikey[161]);
out[2]=(byte) (S[in[2]]^this.ikey[162]);
out[3]=(byte) (S[in[3]]^this.ikey[163]);
out[4]=(byte) (S[in[5]]^this.ikey[164]);
out[5]=(byte) (S[in[6]]^this.ikey[165]);
out[6]=(byte) (S[in[7]]^this.ikey[166]);
out[7]=(byte) (S[in[4]]^this.ikey[167]);
out[8]=(byte) (S[in[10]]^this.ikey[168]);
out[9]=(byte) (S[in[11]]^this.ikey[169]);
out[10]=(byte) (S[in[8]]^this.ikey[170]);
out[11]=(byte) (S[in[9]]^this.ikey[171]);
out[12]=(byte) (S[in[15]]^this.ikey[172]);
out[13]=(byte) (S[in[12]]^this.ikey[173]);
out[14]=(byte) (S[in[13]]^this.ikey[174]);
out[15]=(byte) (S[in[14]]^this.ikey[175]);
return out;
}
private byte[] DecryptRound(byte[] in,int start) {
char[] lineTran=byteTochar(DecryptLastRound(in,start));
byte[] output=new byte[16];
output[0]=(byte) (xetime(lineTran[0])^xbtime(lineTran[4])^xdtime(lineTran[8])^x9time(lineTran[12]));
output[1]=(byte) (xetime(lineTran[1])^xbtime(lineTran[5])^xdtime(lineTran[9])^x9time(lineTran[13]));
output[2]=(byte) (xetime(lineTran[2])^xbtime(lineTran[6])^xdtime(lineTran[10])^x9time(lineTran[14]));
output[3]=(byte) (xetime(lineTran[3])^xbtime(lineTran[7])^xdtime(lineTran[11])^x9time(lineTran[15]));
output[4]=(byte) (x9time(lineTran[0])^xetime(lineTran[4])^xbtime(lineTran[8])^xdtime(lineTran[12]));
output[5]=(byte) (x9time(lineTran[1])^xetime(lineTran[5])^xbtime(lineTran[9])^xdtime(lineTran[13]));
output[6]=(byte) (x9time(lineTran[2])^xetime(lineTran[6])^xbtime(lineTran[10])^xdtime(lineTran[14]));
output[7]=(byte) (x9time(lineTran[3])^xetime(lineTran[7])^xbtime(lineTran[11])^xdtime(lineTran[15]));
output[8]=(byte) (xdtime(lineTran[0])^x9time(lineTran[4])^xetime(lineTran[8])^xbtime(lineTran[12]));
output[9]=(byte) (xdtime(lineTran[1])^x9time(lineTran[5])^xetime(lineTran[9])^xbtime(lineTran[13]));
output[10]=(byte) (xdtime(lineTran[2])^x9time(lineTran[6])^xetime(lineTran[10])^xbtime(lineTran[14]));
output[11]=(byte) (xdtime(lineTran[3])^x9time(lineTran[7])^xetime(lineTran[11])^xbtime(lineTran[15]));
output[12]=(byte) (xbtime(lineTran[0])^xdtime(lineTran[4])^x9time(lineTran[8])^xetime(lineTran[12]));
output[13]=(byte) (xbtime(lineTran[1])^xdtime(lineTran[5])^x9time(lineTran[9])^xetime(lineTran[13]));
output[14]=(byte) (xbtime(lineTran[2])^xdtime(lineTran[6])^x9time(lineTran[10])^xetime(lineTran[14]));
output[15]=(byte) (xbtime(lineTran[3])^xdtime(lineTran[7])^x9time(lineTran[11])^xetime(lineTran[15]));
return output;
}
private byte[] DecryptLastRound(byte[] bin,int start) {
char[] in=byteTochar(bin);
byte[] lineTran=new byte[16];
lineTran[0]=(byte) (InvS[in[0]]^this.ikey[start]);
lineTran[1]=(byte) (InvS[in[1]]^this.ikey[start+1]);
lineTran[2]=(byte) (InvS[in[2]]^this.ikey[start+2]);
lineTran[3]=(byte) (InvS[in[3]]^this.ikey[start+3]);
lineTran[4]=(byte) (InvS[in[7]]^this.ikey[start+4]);
lineTran[5]=(byte) (InvS[in[4]]^this.ikey[start+5]);
lineTran[6]=(byte) (InvS[in[5]]^this.ikey[start+6]);
lineTran[7]=(byte) (InvS[in[6]]^this.ikey[start+7]);
lineTran[8]=(byte) (InvS[in[10]]^this.ikey[start+8]);
lineTran[9]=(byte) (InvS[in[11]]^this.ikey[start+9]);
lineTran[10]=(byte) (InvS[in[8]]^this.ikey[start+10]);
lineTran[11]=(byte) (InvS[in[9]]^this.ikey[start+11]);
lineTran[12]=(byte) (InvS[in[13]]^this.ikey[start+12]);
lineTran[13]=(byte) (InvS[in[14]]^this.ikey[start+13]);
lineTran[14]=(byte) (InvS[in[15]]^this.ikey[start+14]);
lineTran[15]=(byte) (InvS[in[12]]^this.ikey[start+15]);
return lineTran;
}
public void Encrypt() {
byte[] inout=new byte[16];
for(int i=0;i<16;i++)
inout[i]=(byte) (this.plaintext[i]^this.ikey[i]);
for(int j=0;j<9;j++)
inout=EncryptRound(inout,16*j+16);
this.ciphertext=EncryptLastRound(inout);
}
public void Decrypt() {
byte[] inout=new byte[16];
for(int i=0;i<16;i++)
inout[i]=(byte) (this.ciphertext[i]^this.ikey[i+160]);
for(int j=0;j<9;j++)
inout=DecryptRound(inout,(9-j)*16);
this.plaintext=DecryptLastRound(inout,0);
}
public void Encrypt(String plaintext) {
setPlaintext(plaintext);
Encrypt();
}
public void Encrypt(byte[] plaintext) {
setPlaintext(plaintext);
Encrypt();
}
public void Decrypt(String ciphertext) {
setCiphertext(ciphertext);
Decrypt();
}
public void Decrypt(byte[] ciphertext) {
setCiphertext(ciphertext);
Decrypt();
}
public void showIkey() {
int i,j;
for(i=0;i<44;i++) {
if(i%4==0)System.out.print(String.format("k%d: ",i/4));
for(j=4*i;j<4*i+4;j++)
System.out.print(String.format("%02x ",this.ikey[j]));
if(i%4==3)System.out.println();
}
}
public void showInfo() {
showKey();
showIkey();
showPlaintext();
showCiphertext();
}
public void showKey() {
int i;
System.out.print("Key:n Hex:");
for(i=0;i<16;i++)
System.out.print(String.format("%02x ",this.key[i]));
System.out.print("n CH:");
String strKey=new String(this.key);
System.out.println(strKey);
}
public void showPlaintext() {
int i;
System.out.print("Plaintext:n Hex:");
for(i=0;i<16;i++)
System.out.print(String.format("%02x ",this.plaintext[i]));
System.out.print("n CH:");
String strPlaintext=new String(this.plaintext);
System.out.println(strPlaintext);
}
public void showCiphertext() {
int i;
System.out.print("Ciphertext:n Hex:");
for(i=0;i<16;i++)
System.out.print(String.format("%02x ",this.ciphertext[i]));
System.out.println();
}
public void setKey(byte[] key) {
this.key=new byte[16];
int n=key.length>16?16:key.length;
for(int i=0;i16?16:plaintext.length;
for(int i=0;i16?16:ciphertext.length;
for(int i=0;i
CBC.java如下：
package CBC;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
public class CBC {
private byte[] plaintext=null;
private byte[] ciphertext=null;
private byte[] IV=new byte[16];
AES aes=new AES();
public CBC() {
IV=new byte[0];
}
public CBC(byte[] key) {
aes.setKey(key);
}
public CBC(byte[] key,byte[] IV) {
aes.setKey(key);
int n=IV.length>16?16:IV.length;
for(int i=0;i16?16:iv.length;
for(int i=0;i16?16:IV.length;
for(int i=0;i16?16:iv.length;
for(int i=0;i> 4));
sb.append(hexString.charAt((this.plaintext[i-1] & 0x0f) >> 0));
if(i%80==0)sb.append("n");
}
System.out.println(sb.toString());
System.out.println(" CH:"+new String(this.plaintext));
}
public void showCiphertext() {
String hexString = "0123456789abcdef";
System.out.print("Ciphertext:n Hex:");
StringBuilder sb = new StringBuilder(this.ciphertext.length * 2);
for (int i = 1; i <= this.ciphertext.length; i++) {
sb.append(hexString.charAt((this.ciphertext[i-1] & 0xf0) >> 4));
sb.append(hexString.charAt((this.ciphertext[i-1] & 0x0f) >> 0));
if(i%80==0)sb.append("n");
}
System.out.println(sb.toString());
}
private byte[] byteAdd(byte[] bt1, byte[] bt2){
byte[] bt3 = new byte[bt1.length+bt2.length];
System.arraycopy(bt1, 0, bt3, 0, bt1.length);
System.arraycopy(bt2, 0, bt3, bt1.length, bt2.length);
return bt3;
}
private byte[] byteXOR(byte[] bt1, byte[] bt2) {
byte[] bt3 = new byte[16];
System.arraycopy(bt1, 0, bt3, 0, bt1.length);
for(int i=0;i>4&0xf);
str+=hexString.charAt(b&0xf);
}
return str;
}
private byte[] stringTobyte(String str){
int high,low;
byte[] buf=new byte[str.length()/2];
for(int i=0;i
testCBC.java如下：
package CBC;
public class testCBC {
static String plainPath="src/CBC/plain.txt";
static String cipherPath="src/CBC/cipher.txt";
public static void main(String[] args) {
String key="fhieowubgjdkjldfl";
String IV="fwsssssrf45";
CBC cbc=new CBC(key,IV);
//测试加密
encrypt(cbc, plainPath);
//测试解密
// decrypt(cbc, cipherPath);
}
public static void encrypt(CBC cbc,String plainPath) {
cbc.setPlaintext(plainPath);
cbc.Encrypt();
cbc.writeCiphertext(cipherPath);
cbc.showPlaintext();
cbc.showCiphertext();
}
public static void decrypt(CBC cbc,String cipherPath) {
cbc.setCiphertext(cipherPath);
cbc.Decrypt();
cbc.writePlaintext(plainPath);
cbc.showPlaintext();
cbc.showCiphertext();
}
}
测试结果：
可以看到加密后的密文（16进制）已经保存在了cipher.txt中：
接下来注释掉第11行，第13行取消注释，进行解密的测试：
文章被正确的解密！
欢迎分享，转载请注明来源：内存溢出
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