java的DES加密解密辅助类
package temptest;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import javax.crypto.*;
import javax.crypto.spec.*;
import sun.misc.BASE64Decoder;
public class desencryptiontest {
public static void main(String[] args) {
String text = "测试asdY^&*NN!__s some plaintext!";
System.out.println("加密前的明文:" + text);
String cryperText = "";
try {
cryperText = toHexString(encrypt(text));
System.out.println("加密前的明文:" + cryperText);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
System.out.println("解密后的明文:" + decrypt(cryperText));
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
System.in.read();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private static byte[] desKey;
private static String key = "19491001";
public static String decrypt(String message) throws Exception {
byte[] bytesrc = convertHexString(message);
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
byte[] retByte = cipher.doFinal(bytesrc);
return new String(retByte);
}
public static byte[] encrypt(String message) throws Exception {
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
return cipher.doFinal(message.getBytes("UTF-8"));
}
public static byte[] convertHexString(String ss) {
byte digest[] = new byte[ss.length() / 2];
for (int i = 0; i < digest.length; i++) {
String byteString = ss.substring(2 * i, 2 * i + 2);
int byteValue = Integer.parseInt(byteString, 16);
digest[i] = (byte) byteValue;
}
return digest;
}
public static String toHexString(byte b[]) {
StringBuffer hexString = new StringBuffer();
for (int i = 0; i < b.length; i++) {
String plainText = Integer.toHexString(0xff & b[i]);
if (plainText.length() < 2)
plainText = "0" + plainText;
hexString.append(plainText);
}
return hexString.toString();
}
}
发布者：系统管理员 点击数：1544 发布时间：2017-09-01 17:49:24 更新时间：2018-05-18 17:54:24
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