[java] AES256 암호화

https://github.com/Woniper/JavaExample/tree/master/AES256

1. commons-codec-1.9.jar 추가

commons-codec-1.9.jar

2. AES256 구현

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package com.woniper.aes;   import java.io.UnsupportedEncodingException; import java.security.InvalidAlgorithmParameterException; import java.security.InvalidKeyException; import java.security.Key; import java.security.NoSuchAlgorithmException;   import javax.crypto.BadPaddingException; import javax.crypto.Cipher; import javax.crypto.IllegalBlockSizeException; import javax.crypto.NoSuchPaddingException; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.SecretKeySpec;   import org.apache.commons.codec.binary.Base64;   public class AES256Util {     private String iv;     private Key keySpec;       public AES256Util(String key) throws UnsupportedEncodingException {         this.iv = key.substring(0, 16);           byte[] keyBytes = new byte[16];         byte[] b = key.getBytes("UTF-8");         int len = b.length;         if(len > keyBytes.length)             len = keyBytes.length;         System.arraycopy(b, 0, keyBytes, 0, len);         SecretKeySpec keySpec = new SecretKeySpec(keyBytes, "AES");           this.keySpec = keySpec;     }       // 암호화     public String aesEncode(String str) throws java.io.UnsupportedEncodingException, NoSuchAlgorithmException,                                                       NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException,                                                       IllegalBlockSizeException, BadPaddingException{         Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding");         c.init(Cipher.ENCRYPT_MODE, keySpec, new IvParameterSpec(iv.getBytes()));           byte[] encrypted = c.doFinal(str.getBytes("UTF-8"));         String enStr = new String(Base64.encodeBase64(encrypted));           return enStr;     }       //복호화     public String aesDecode(String str) throws java.io.UnsupportedEncodingException, NoSuchAlgorithmException,                                                       NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException,                                                       IllegalBlockSizeException, BadPaddingException {         Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding");         c.init(Cipher.DECRYPT_MODE, keySpec, new IvParameterSpec(iv.getBytes("UTF-8")));           byte[] byteStr = Base64.decodeBase64(str.getBytes());           return new String(c.doFinal(byteStr),"UTF-8");     } }

3. TEST 

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package com.woniper.aes;   public class MainAES {       public static void main(String[] args) throws Exception {         String key = "aes256-test-key!!";       // key는 16자 이상          AES256Util aes256 = new AES256Util(key);                   String text = "암호화되지 않은 문자입니다.";         String encText = aes256.aesEncode(text);         String decText = aes256.aesDecode(encText);                   System.out.println("암호화할 문자 : " + text);         System.out.println("암호화된 문자 : " + encText);         System.out.println("복호화된 문자 : " + decText);     }   }

4. 출력 결과

출처 : https://blog.woniper.net/216?category=506090