자바 ECB 복호화 오류

4656 단어
Exception in thread "main" javax.crypto.BadPaddingException: Given final block not properly padded
	at com.sun.crypto.provider.SunJCE_f.b(DashoA13*..)
	at com.sun.crypto.provider.SunJCE_f.b(DashoA13*..)
	at com.sun.crypto.provider.DESedeCipher.engineDoFinal(DashoA13*..)
	at javax.crypto.Cipher.doFinal(DashoA13*..)
	at com.xy.code.Des3.ees3DecodeECB(Des3.java:60)
	at com.xy.code.Des3.main(Des3.java:17)

암호 화 된 문자열 을 가 져 오 려 면 base 64 를 바이트 배열 로 디 코딩 한 다음 바이트 배열 을 복호화 해 야 합 니 다.
import java.security.Key;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
import javax.crypto.spec.IvParameterSpec;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
public class Des3 {
    public static void main(String[] args) throws Exception {
        byte[] key=new BASE64Decoder().decodeBuffer("YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4");
        byte[] keyiv = { 1, 2, 3, 4, 5, 6, 7, 8 };
        byte[] data="105|    |.,。、;‘|asddasdas".getBytes("UTF-8");
        byte[] a = new BASE64Decoder().decodeBuffer("sJXqpz8mkdAj0F51S690RPTiFPUmSk6A");
        System.out.println("ECB    ");
        byte[] str3 = des3EncodeECB(key, data);
        byte[] str4 = ees3DecodeECB(key, a);
        System.out.println(new BASE64Encoder().encode(str3));
        System.out.println(new String(str4, "UTF-8"));
        System.out.println();
        System.out.println("CBC    ");
        byte[] str5 = des3EncodeCBC(key, keyiv, data);
        byte[] str6 = des3DecodeCBC(key, keyiv, a);
        System.out.println(new BASE64Encoder().encode(str5));
        System.out.println(new String(str6, "UTF-8"));
    }
    /**
     * ECB  ,  IV
     * @param key   
     * @param data   
     * @return Base64     
     * @throws Exception
     */
    public static byte[] des3EncodeECB(byte[] key, byte[] data)
            throws Exception {
        Key deskey = null;
        DESedeKeySpec spec = new DESedeKeySpec(key);
        SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
        deskey = keyfactory.generateSecret(spec);
        Cipher cipher = Cipher.getInstance("desede" + "/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, deskey);
        byte[] bOut = cipher.doFinal(data);
        return bOut;
    }
    /**
     * ECB  ,  IV
     * @param key   
     * @param data Base64     
     * @return   
     * @throws Exception
     */
    public static byte[] ees3DecodeECB(byte[] key, byte[] data)
            throws Exception {
        Key deskey = null;
        DESedeKeySpec spec = new DESedeKeySpec(key);
        SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
        deskey = keyfactory.generateSecret(spec);
        Cipher cipher = Cipher.getInstance("desede" + "/ECB/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, deskey);
        byte[] bOut = cipher.doFinal(data);
        return bOut;
    }
    /**
     * CBC  
     * @param key   
     * @param keyiv IV
     * @param data   
     * @return Base64     
     * @throws Exception
     */
    public static byte[] des3EncodeCBC(byte[] key, byte[] keyiv, byte[] data)
            throws Exception {
        Key deskey = null;
        DESedeKeySpec spec = new DESedeKeySpec(key);
        SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
        deskey = keyfactory.generateSecret(spec);
        Cipher cipher = Cipher.getInstance("desede" + "/CBC/PKCS5Padding");
        IvParameterSpec ips = new IvParameterSpec(keyiv);
        cipher.init(Cipher.ENCRYPT_MODE, deskey, ips);
        byte[] bOut = cipher.doFinal(data);
        return bOut;
    }
    /**
     * CBC  
     * @param key   
     * @param keyiv IV
     * @param data Base64     
     * @return   
     * @throws Exception
     */
    public static byte[] des3DecodeCBC(byte[] key, byte[] keyiv, byte[] data)
            throws Exception {
        Key deskey = null;
        DESedeKeySpec spec = new DESedeKeySpec(key);
        SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
        deskey = keyfactory.generateSecret(spec);
        Cipher cipher = Cipher.getInstance("desede" + "/CBC/PKCS5Padding");
        IvParameterSpec ips = new IvParameterSpec(keyiv);
        cipher.init(Cipher.DECRYPT_MODE, deskey, ips);
        byte[] bOut = cipher.doFinal(data);
        return bOut;
    }
}

PS: ECB 암호 화 를 사용 하면 CBC 디 코딩 을 사용 해도 이 오류 가 발생 합 니 다.

좋은 웹페이지 즐겨찾기