Android AES加密工具类，解决只能加密不能解密问题

import android.annotation.SuppressLint;

import java.security.SecureRandom;

import javax.crypto.Cipher;

import javax.crypto.KeyGenerator;

import javax.crypto.SecretKey;

import javax.crypto.spec.SecretKeySpec;

public class AESEncryptor {

public static String key = "abcdefg";

public static String encrypt(String src) throws Exception {

byte[] rawKey = getRawKey(key.getBytes());

byte[] result = encrypt(rawKey, src.getBytes());

return toHex(result);

}

public static String decrypt(String encrypted) throws Exception {

byte[] rawKey = getRawKey(key.getBytes());

byte[] enc = toByte(encrypted);

byte[] result = decrypt(rawKey, enc);

return new String(result);

}

@SuppressLint("TrulyRandom")

private static byte[] getRawKey(byte[] seed) throws Exception {

KeyGenerator kgen = KeyGenerator.getInstance("AES");

// SHA1PRNG 强随机种子算法, 要区别4.2以上版本的调用方法

SecureRandom sr = null;

if (android.os.Build.VERSION.SDK_INT > android.os.Build.VERSION_CODES.JELLY_BEAN) {

sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");

} else {

sr = SecureRandom.getInstance("SHA1PRNG");

}

sr.setSeed(seed);

kgen.init(256, sr); // 256 bits or 128 bits,192bits

SecretKey skey = kgen.generateKey();

byte[] raw = skey.getEncoded();

return raw;

}

private static byte[] encrypt(byte[] key, byte[] src) throws Exception {

SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");

Cipher cipher = Cipher.getInstance("AES");

cipher.init(Cipher.ENCRYPT_MODE, skeySpec);

byte[] encrypted = cipher.doFinal(src);

return encrypted;

}

private static byte[] decrypt(byte[] key, byte[] encrypted)

throws Exception {

SecretKeySpec skeySpec = new SecretKeySpec(key, "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));

}

}