引用:
作者stalin
人腦debug太累
可以把exception的log 貼出來嗎
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其實主要 執行到
代碼:
System.out.print( "input to Hex to byte to 32 hexstr2arrayb : "+hexstr2arrayb(seed,64));
System.out.println();
就會exception
我是用System.out.print來測試hexstr2arrayb
然後exception是說
Exception in thread "main" java.lang.NullPointerException
at aestest.hexstr2arrayb(aestest.java:271)
at aestest.encrypt(aestest.java:99)
at aestest.main(aestest.java:35)
話說找到在java補0的方法了
可是範例上是說16bit的補0
如果要強制補0到128要怎麼補?
引用:
PHP的AES加密填充只有ZeroPadding(补零 - 因为数据长度不是16的整数倍就需要填充),而Java是没
有这种填充模式,杯具的只能自己写一个了,那Java的填充模式就用NoPadding(不填充内容)
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代碼:
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author Jacker
*/
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import sun.misc.BASE64Decoder;
public class Encryption
{
public static void main(String args[]) throws Exception {
System.out.println(encrypt());
System.out.println(desEncrypt());
}
public static String encrypt() throws Exception {
try {
String data = "Test String";
String key = "1234567812345678";
String iv = "1234567812345678";
Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
int blockSize = cipher.getBlockSize();
byte[] dataBytes = data.getBytes();
int plaintextLength = dataBytes.length;
if (plaintextLength % blockSize != 0) {
plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));
}
byte[] plaintext = new byte[plaintextLength];
System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);
SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());
cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
byte[] encrypted = cipher.doFinal(plaintext);
return new sun.misc.BASE64Encoder().encode(encrypted);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
public static String desEncrypt() throws Exception {
try
{
String data = "2fbwW9+8vPId2/foafZq6Q==";
String key = "1234567812345678";
String iv = "1234567812345678";
byte[] encrypted1 = new BASE64Decoder().decodeBuffer(data);
Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());
cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);
byte[] original = cipher.doFinal(encrypted1);
String originalString = new String(original);
return originalString;
}
catch (Exception e) {
e.printStackTrace();
return null;
}
}
}
怪異的是
這一篇又說可以
ZeroBytePadding
http://blog.csdn.net/whu_zhangmin/a...etails/30284809
代碼:
package com.example.crypto;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
/**
* Created with IntelliJ IDEA.
* User: zhangmin
* Module: Safe
* Date: 14-6-9
* Time: 下午3:13
*/
public class AESCrypto {
public static String encrypt(String seed, String cleartext) throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] result = encrypt(rawKey, cleartext.getBytes());
return toHex(result);
}
public static String decrypt(String seed, String encrypted) throws Exception {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] enc = toByte(encrypted);
byte[] result = decrypt(rawKey, enc);
return new String(result);
}
private static byte[] getRawKey(byte[] seed) throws Exception {
KeyGenerator kgen = KeyGenerator.getInstance("AES");
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
sr.setSeed(seed);
kgen.init(128, sr); // 192 and 256 bits may not be available
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
return raw;
}
private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES/ECB/ZeroBytePadding");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted = cipher.doFinal(clear);
return encrypted;
}
private static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES/ECB/ZeroBytePadding");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
byte[] decrypted = cipher.doFinal(encrypted);
return decrypted;
}
public static String toHex(String txt) {
return toHex(txt.getBytes());
}
public static String fromHex(String hex) {
return new String(toByte(hex));
}
public static byte[] toByte(String hexString) {
int len = hexString.length() / 2;
byte[] result = new byte[len];
for (int i = 0; i < len; i++)
result[i] = Integer.valueOf(hexString.substring(2 * i, 2 * i + 2), 16).byteValue();
return result;
}
public static String toHex(byte[] buf) {
if (buf == null)
return "";
StringBuffer result = new StringBuffer(2 * buf.length);
for (int i = 0; i < buf.length; i++) {
appendHex(result, buf[i]);
}
return result.toString();
}
private final static String HEX = "0123456789ABCDEF";
private static void appendHex(StringBuffer sb, byte b) {
sb.append(HEX.charAt((b >> 4) & 0x0f)).append(HEX.charAt(b & 0x0f));
}
}
謝謝