package cn.fulong.ccf.common;
import java.io.UnsupportedEncodingException;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.KeySpec;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
public class DesEncrypter {
Cipher ecipher;
Cipher dcipher;
// 8-byte Salt
byte[] salt = {
(byte) 0xA9, (byte) 0x9B, (byte) 0xC8, (byte) 0x32,
(byte) 0x56, (byte) 0x35, (byte) 0xE3, (byte) 0x03
};
// Iteration count
int iterationCount = 19;
public DesEncrypter(String passPhrase) {
try {
// Create the key
KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt,
iterationCount);
SecretKey key = SecretKeyFactory.getInstance(
"PBEWithMD5AndDES").generateSecret(keySpec);
ecipher = Cipher.getInstance(key.getAlgorithm());
dcipher = Cipher.getInstance(key.getAlgorithm());
// Prepare the parameter to the ciphers
AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt,
iterationCount);
// Create the ciphers
ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
}
catch (java.security.InvalidAlgorithmParameterException e) {
}
catch (java.security.spec.InvalidKeySpecException e) {
}
catch (javax.crypto.NoSuchPaddingException e) {
}
catch (java.security.NoSuchAlgorithmException e) {
}
catch (java.security.InvalidKeyException e) {
}
}
public String encrypt(String str) {
try {
// Encode the string into bytes using utf-8
byte[] utf8 = str.getBytes("UTF8");
// Encrypt
byte[] enc = ecipher.doFinal(utf8);
// Encode bytes to base64 to get a string
return new sun.misc.BASE64Encoder().encode(enc);
}
catch (javax.crypto.BadPaddingException e) {
}
catch (IllegalBlockSizeException e) {
}
catch (UnsupportedEncodingException e) {
}
catch (java.io.IOException e) {
}
return null;
}
public String decrypt(String str) {
try {
// Decode base64 to get bytes
byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(str);
// Decrypt
byte[] utf8 = dcipher.doFinal(dec);
// Decode using utf-8
return new String(utf8, "UTF8");
}
catch (javax.crypto.BadPaddingException e) {
}
catch (IllegalBlockSizeException e) {
}
catch (UnsupportedEncodingException e) {
}
catch (java.io.IOException e) {
}
return null;
}
public static double multi(long n) {
if (n == 0) {
return 1;
} else {
return n * multi(n - 1);
}
}
public static void main(String arg[]) {
/*
* 解密
*/
String in="gAPYzh+OfUk=";
DesEncrypter desin=new DesEncrypter("fulong");
System.out.println(desin.decrypt(in));
/*
* 加密
*/
String out = "fulong";
DesEncrypter desout = new DesEncrypter("fulong");
System.out.println(desout.encrypt(out));
//System.out.print(multi(3));
}
}
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