private static final String AES = "AES";
private static int keysizeAES = 128;
private static String charset = "utf-8";
/**
* 使用AES加密算法经行加密(可逆)
* @param res 需要加密的密文
* @param key 秘钥
* @return
*/
public static String AESencode(String res, String key) {
return keyGeneratorES(res, AES, key, keysizeAES, true);
}
/**
* 对使用AES加密算法的密文进行解密
* @param res 需要解密的密文
* @param key 秘钥
* @return
*/
public static String AESdecode(String res, String key) {
return keyGeneratorES(res, AES, key, keysizeAES, false);
}
/**
* 使用KeyGenerator双向加密,DES/AES,注意这里转化为字符串的时候是将2进制转为16进制格式的字符串,不是直接转,因为会出错
* @param res 加密的原文
* @param algorithm 加密使用的算法名称
* @param key 加密的秘钥
* @param keysize
* @param isEncode
* @return
*/
private static String keyGeneratorES(String res, String algorithm, String key, int keysize, boolean isEncode) {
try {
KeyGenerator kg = KeyGenerator.getInstance(algorithm);
if (keysize == 0) {
byte[] keyBytes = charset == null ? key.getBytes() : key.getBytes(charset);
kg.init(new SecureRandom(keyBytes));
} else if (key == null) {
kg.init(keysize);
} else {
byte[] keyBytes = charset == null ? key.getBytes() : key.getBytes(charset);
/**windows中使用
kg.init(keysize, new SecureRandom(keyBytes));
*/
/**Linux中使用,此处经过实际生产测试可用*/
SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
random.setSeed(keyBytes);
kg.init(keysize, random);
}
SecretKey sk = kg.generateKey();
SecretKeySpec sks = new SecretKeySpec(sk.getEncoded(), algorithm);
Cipher cipher = Cipher.getInstance(algorithm);
if (isEncode) {
cipher.init(Cipher.ENCRYPT_MODE, sks);
byte[] resBytes = charset == null? res.getBytes() : res.getBytes(charset);
return parseByte2HexStr(cipher.doFinal(resBytes));
} else {
cipher.init(Cipher.DECRYPT_MODE, sks);
return new String(cipher.doFinal(parseHexStr2Byte(res)));
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**将二进制转换成16进制 */
public static String parseByte2HexStr(byte buf[]) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < buf.length; i++) {
String hex = Integer.toHexString(buf[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
sb.append(hex.toUpperCase());
}
return sb.toString();
}
/**将16进制转换为二进制*/
public static byte[] parseHexStr2Byte(String hexStr) {
if (hexStr.length() < 1)
return null;
byte[] result = new byte[hexStr.length()/2];
for (int i = 0;i< hexStr.length()/2; i++) {
int high = Integer.parseInt(hexStr.substring(i*2, i*2+1), 16);
int low = Integer.parseInt(hexStr.substring(i*2+1, i*2+2), 16);
result[i] = (byte) (high * 16 + low);
}
return result;
}
public static void main(String[] args) {
System.out.println(AESencode("测试解密文字","hello"));
System.out.println(AESdecode("130FB21FB4B85E0C60C2B995AC2A30","hello"));
}