e8VzqzV4

1package chela.spring.core;
2
3import javax.crypto.Cipher;
4import javax.crypto.spec.IvParameterSpec;
5import javax.crypto.spec.SecretKeySpec;
6import java.util.Base64;
7
8final public class ChCrypto {
9    final static Base64.Encoder encorder = Base64.getEncoder();
10    final static Base64.Decoder decorder = Base64.getDecoder();
11    static private Cipher cipher(int opmode, String secretKey) throws Exception{
12        if(secretKey.length() != 32) throw new RuntimeException("SecretKey length is not 32 chars");
13        Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding");
14        SecretKeySpec sk = new SecretKeySpec(secretKey.getBytes(), "AES");
15        IvParameterSpec iv = new IvParameterSpec(secretKey.substring(0, 16).getBytes()); //0~16은 서버와 합의!
16        c.init(opmode, sk, iv);
17        return c;
18    }
19    static public String encrypt(String str, String secretKey){
20        try{
21            byte[] encrypted = cipher(Cipher.ENCRYPT_MODE, secretKey).doFinal(str.getBytes("UTF-8"));
22            return new String(encorder.encode(encrypted));
23        }catch(Exception e){
24            return null;
25        }
26    }
27    static public String decrypt(String str, String secretKey){
28        try{
29            byte[] byteStr = decorder.decode(str.getBytes());
30            return new String(cipher(Cipher.DECRYPT_MODE, secretKey).doFinal(byteStr),"UTF-8");
31        }catch(Exception e){
32            return null;
33        }
34    }
35}