[Android] AES 암호화, 복호화

소스

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");
    }
}

 

TEST

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);
    }
 

 

 

출처 : 

http://aramk.tistory.com/32

http://woniperstory.tistory.com/216