JAVA,AES加密算法

private static final String AES = "AES";
private static final String CHARSET_NAME = "utf-8";

private static SecretKeySpec getKey(String password)
throws NoSuchAlgorithmException {
// 密钥加密器生成器
KeyGenerator kgen = KeyGenerator.getInstance(AES);
SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
random.setSeed(password.getBytes());
kgen.init(128, random);
// 创建加密器
SecretKey secretKey = kgen.generateKey();
byte[] enCodeFormat = secretKey.getEncoded();
SecretKeySpec key = new SecretKeySpec(enCodeFormat, AES);
return key;
}

public static String encode(String str, String password) {
byte[] arr = encodeToArr(str, password);
return byteArrToString(arr);
}

private static byte[] encodeToArr(String str, String password) {
try {
Cipher cipher = Cipher.getInstance(AES);// 创建密码器
byte[] byteContent = str.getBytes(CHARSET_NAME);

cipher.init(Cipher.ENCRYPT_MODE, getKey(password));// 初始化
byte[] result = cipher.doFinal(byteContent);
return result;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}

public static String decode(String hexStr, String password) {
try {
byte[] arr = string2ByteArr(hexStr);
return decode(arr, password);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}

private static String decode(byte[] arr, String password) {
try {
// 创建密码器
Cipher cipher = Cipher.getInstance(AES);
cipher.init(Cipher.DECRYPT_MODE, getKey(password));// 初始化

byte[] result = cipher.doFinal(arr);
return new String(result, CHARSET_NAME);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}

private static String byteArrToString(byte[] arr) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < arr.length; i++) {
String s = Integer.toString(arr[i] + 128, 16);
if (s.length() == 1) {
s = "0" + s;
}
sb.append(s);
}

return sb.toString().toUpperCase();
}

private static byte[] string2ByteArr(String s) {
s = s.toUpperCase();
String str = "0123456789ABCDEF";
byte[] arr = new byte[s.length() / 2];
for (int i = 0; i < arr.length; i++) {
char s1 = s.charAt(i * 2);
char s2 = s.charAt(i * 2 + 1);
int tmp1 = str.indexOf(s1) * 16;
int tmp2 = str.indexOf(s2);
arr[i] = (byte) (tmp1 + tmp2 - 128);

}
return arr;
}