android AES加密代码

package com.example.crack_me;

import java.security.Key;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
/**
* Created by Anciety on 7/19/16.
*/
public class Encrption {

public static String encrypt(String key, String raw_text) throws Exception {
byte[] rawKey = getRawKey(key.getBytes());
byte[] result = encrypt(rawKey, raw_text.getBytes());
return toHex(result);
}

public static String decrypt(String key, String encrypted) throws Exception {
byte[] rawKey = getRawKey(key.getBytes());
byte[] enc = toByte(encrypted);
byte[] result = decrypt(rawKey, enc);
return new String(result);
}

private static byte[] getRawKey(byte[] seed) throws Exception {
KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
**SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG", "Crypto");**

secureRandom.setSeed(seed);
keyGenerator.init(128, secureRandom);

SecretKey secretKey = keyGenerator.generateKey();
byte[] raw = secretKey.getEncoded();
return raw;
}

private static byte[] encrypt(byte[] raw, byte[] raw_text) throws Exception {
SecretKeySpec secretKeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);

byte[] encrypted = cipher.doFinal(raw_text);
return encrypted;
}

private static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception {
SecretKeySpec secretKeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);
byte[] raw_text = cipher.doFinal(encrypted);
return raw_text;
}

public static String toHex(String text) {
return toHex(text.getBytes());
}

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();
}

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;
}

private final static String HEX = "0123456789ABCDEF";

private static void appendHex(StringBuffer stringBuffer, byte b) {
stringBuffer.append(HEX.charAt((b >> 4) & 0x0f)).append(HEX.charAt(b & 0x0f));
}
}

javax.crypto.BadPaddingException: pad block corrupted