android javax.crypto.BadPaddingException: pad block corrupted
今天发现在windows上能正常使用的java aes代码在android上无法使用，折腾了一天。。。。最后查了些资料后发现主要原因是在windows上以及android上产生的key是不同的，所以更改了以下类的使用方法便可以正常使用。主要是自己传递了一个16个字符的seed即可。
以下代码经过在手机上测试可用
<pre>
import java.security.SecureRandom;
import java.util.UUID;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
/**
- AES加密器
- @author padnans
/
public class AESEncryptor {
/*
* 生成秘钥 16位，否则不能进行正常的加密解密
/
public static final int passwordLength = 16;
/*
* 生成秘钥 16位，否则不能进行正常的加密解密
* @return
/
public static String randomPassword(){
String uuid = UUID.randomUUID().toString();
System.out.println("uuid = "+uuid.length());
int random = (int)(Math.random()11);
String password = uuid.substring(random,random+passwordLength);
return password;
}
public static String encrypt(String seed, String cleartext)
throws Exception {
// byte[] rawKey = getRawKey(seed.getBytes());
byte[] rawKey = 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[] rawKey = 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");
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");
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");
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));
}
}
</pre>
测试代码：
加密：
<pre>
String random = AESEncryptor.randomPassword();
String password = random;
try {
String msgEncrypt = AESEncryptor.encrypt(password,mMsgText);
mMsgText = password+msgEncrypt+"[.SNAPCHAT]";
Log.i("=======加密========密码："+password+",数据："+msgEncrypt);
}catch (Exception e){
e.printStackTrace();
}
</pre>
解密：
<pre>
String password = sms.content.substring(0,AESEncryptor.passwordLength);
String msgEncrypt = sms.content.substring(AESEncryptor.passwordLength).replace("[.SNAPCHAT]","");// 前面16个字符是秘钥的一部分
String s = "";
try {
s = AESEncryptor.decrypt(password, msgEncrypt);
Log.i("=======解密========密码："+password+",数据："+msgEncrypt);
}catch (Exception e){
e.printStackTrace();
}
</pre>
