AES加密代码


public class EncryptUtil {

// --------------------部分代码-----------

/**

* AES加密

*

* @param key

* 密钥信息

* @param content

* 待加密信息

*/

public static byte[] encodeAES(byte[] key, byte[] content) throws Exception {

// 不是16的倍数的，补足

int base = 16;

if (key.length % base != 0) {

int groups = key.length / base + (key.length % base != 0 ? 1 : 0);

byte[] temp = new byte[groups * base];

Arrays.fill(temp, (byte) 0);

System.arraycopy(key, 0, temp, 0, key.length);

key = temp;

}

SecretKey secretKey = new SecretKeySpec(key, "AES");

IvParameterSpec iv = new IvParameterSpec(new byte[] { 0, 0, 0, 0, 0, 0,

0, 0, 0, 0, 0, 0, 0, 0, 0, 0 });

Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");

cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);

byte[] tgtBytes = cipher.doFinal(content);

return tgtBytes;

}

/**

* AES解密

*

* @param key

* 密钥信息

* @param content

* 待加密信息

* @return

* @throws Exception

*/

public static byte[] decodeAES(byte[] key, byte[] content) throws Exception {

// 不是16的倍数的，补足

int base = 16;

if (key.length % base != 0) {

int groups = key.length / base + (key.length % base != 0 ? 1 : 0);

byte[] temp = new byte[groups * base];

Arrays.fill(temp, (byte) 0);

System.arraycopy(key, 0, temp, 0, key.length);

key = temp;

}

SecretKey secretKey = new SecretKeySpec(key, "AES");

IvParameterSpec iv = new IvParameterSpec(new byte[] { 0, 0, 0, 0, 0, 0,

0, 0, 0, 0, 0, 0, 0, 0, 0, 0 });

Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");

cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);

byte[] tgtBytes = cipher.doFinal(content);

return tgtBytes;

}

//身份验证使用这个方法。

public static String encryptAES(String content, String key) {

try {

return bytesToHexString(encodeAES(key.getBytes(),

content.getBytes()));

} catch (Exception e) {

return null;

}

}

public static String decryptAES(String content, String key) {

try {

byte[] contentByte = hexStringToByte(content);

return new String(decodeAES(key.getBytes(), contentByte),

"UTF-8");

} catch (Exception e) {

return null;

}

}

/**

* 把字节数组转换成16进制字符串

*

* @parambArray

* @return

*/

public static String bytesToHexString(byte[] bArray) {

StringBuffer sb = new StringBuffer(bArray.length);

String sTemp;

for (int i = 0; i<bArray.length; i++) {

sTemp = Integer.toHexString(0xFF &bArray[i]);

if (sTemp.length() < 2)

sb.append(0);

sb.append(sTemp.toUpperCase());

}

return sb.toString();

}

/*

* 把16进制字符串转换成字节数组

*

* @param hex

*

* @return

*/

public static byte[] hexStringToByte(String hex) {

int len = (hex.length() / 2);

byte[] result = new byte[len];

char[] achar = hex.toCharArray();

for (int i = 0; i<len; i++) {

int pos = i * 2;

result[i] = (byte) (toByte(achar[pos]) << 4 | toByte(achar[pos + 1]));

}

return result;

}

private static byte toByte(char c) {

byte b = (byte) "0123456789ABCDEF".indexOf(c);

return b;

}

}