- import android.annotation.SuppressLint;
- import java.security.SecureRandom;
- import javax.crypto.Cipher;
- import javax.crypto.KeyGenerator;
- import javax.crypto.SecretKey;
- import javax.crypto.spec.IvParameterSpec;
- import javax.crypto.spec.SecretKeySpec;
- /**
- *
- *
- * Author:sunger
- */
- public class AESUtils {
- 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);
- }
- @SuppressLint("TrulyRandom")
- 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");
- cipher.init(Cipher.ENCRYPT_MODE, skeySpec, new IvParameterSpec(
- new byte[cipher.getBlockSize()]));
- 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, new IvParameterSpec(
- new byte[cipher.getBlockSize()]));
- byte[] decrypted = cipher.doFinal(encrypted);
- return decrypted;
- }
- private 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 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));
- }
- }
来源: http://www.phpxs.com/code/1001960/