이것은 AES 알고리즘을 사용하여 java에서 문자열을 암호화하고 암호 해독하기위한 코드입니다.Null PointerException AES 알고리즘
스택 트레이스 :
javax.crypto.IllegalBlockSizeException: Input length must be multiple of 16 when decrypting with padded cipher
at com.sun.crypto.provider.SunJCE_f.b(DashoA13*..)
at com.sun.crypto.provider.SunJCE_f.b(DashoA13*..)
at com.sun.crypto.provider.AESCipher.engineDoFinal(DashoA13*..)
at javax.crypto.Cipher.doFinal(DashoA13*..)
at test.AES.AESdecryptalgo(AES.java:76)
at test.AES.main(AES.java:95)
코드 :
package test;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.security.*;
public class AES
{
public byte[] encrypted;
public byte[] original;
public String originalString;
Cipher cipher;
SecretKeySpec skeySpec;
IvParameterSpec spec;
byte [] iv;
/*public static String asHex (byte buf[])
{
StringBuffer strbuf = new StringBuffer(buf.length * 2);
int i;
for (i = 0; i < buf.length; i++) {
if (((int) buf[i] & 0xff) < 0x10)
strbuf.append("0");
strbuf.append(Long.toString((int) buf[i] & 0xff, 16));
}
return strbuf.toString();
}*/
public AES()
{
try
{
KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(128);
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
skeySpec = new SecretKeySpec(raw, "AES");
cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
}
catch(Exception ex)
{ex.printStackTrace();}
}
public String AESencryptalgo(byte[] text)
{
String newtext="";
try
{
// byte[] raw = skey.getEncoded();
//SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
AlgorithmParameters param = cipher.getParameters();
IvParameterSpec ivspec=param.getParameterSpec(IvParameterSpec.class);
iv=ivspec.getIV();
spec=new IvParameterSpec(iv);
//AlgorithmParameters params = cipher.getParameters();
//iv = params.getParameterSpec(IvParameterSpec.class).getIV();
encrypted = cipher.doFinal(text);
}
catch(Exception e)
{
e.printStackTrace();
}
finally
{
newtext=new String(encrypted);
//System.out.println("ENCRYPTED "+newtext);
return newtext;
}
}
public String AESdecryptalgo(byte[] text)
{
try
{
cipher.init(Cipher.DECRYPT_MODE, skeySpec,spec);
original = cipher.doFinal(text); //Exception occurs here
originalString = new String(original);
}
catch(Exception e)
{
e.printStackTrace();
}
finally
{
return originalString;
}
}
public static void main(String[] args)
{
AES a=new AES();
String encrypt=a.AESencryptalgo("hello".getBytes());
System.out.println(encrypt);
String decrypt=a.AESdecryptalgo(encrypt.getBytes());
System.out.println(decrypt);
}
}`
예외 스택 추적을 포함 할 수 있습니까? – bragboy
가능한 중복 (동일한 사용자 기준) : http://stackoverflow.com/questions/3180878/exception-in-aes-decryption-algorithm-in-java, http://stackoverflow.com/questions/3181535/exception-in -aes-decryption-algorithm-in-java –
나는 나의 이전 게시물에서 제안 된 수정을했고 나는 다른 예외를 가지고있다. – sparkle