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Thread: Neeeeeeeed Help

  1. #1
    Junior Member
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    Unhappy Neeeeeeeed Help

    AES Java :

    import java.security.MessageDigest;
    import java.util.Arrays;
    import javax.crypto.KeyGenerator;
    import javax.crypto.SecretKey;
    import javax.crypto.spec.SecretKeySpec;
    import javax.crypto.spec.IvParameterSpec;

    import javax.crypto.Cipher;
    import javax.crypto.spec.IvParameterSpec;
    import javax.crypto.spec.SecretKeySpec;

    public class AES {
    static String IV = "AAAAAAAAAAAAAAAA";
    static String plaintext = "test text 123\0\0\0"; /*Note null padding*/
    static String encryptionKey = "0123456789abcdef";
    public static void main(String [] args) {
    try {

    System.out.println("==Java==");
    System.out.println("plain: " + plaintext);

    byte[] cipher = encrypt(plaintext, encryptionKey);

    System.out.print("cipher: ");
    for (int i=0; i<cipher.length; i++)
    System.out.print(new Integer(cipher[i])+" ");
    System.out.println("");

    String decrypted = decrypt(cipher, encryptionKey);

    System.out.println("decrypt: " + decrypted);

    } catch (Exception e) {
    e.printStackTrace();
    }
    }

    public static byte[] encrypt(String plainText, String encryptionKey) throws Exception {
    Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding", "SunJCE");
    SecretKeySpec key = new SecretKeySpec(encryptionKey.getBytes("UTF-8"), "AES");
    cipher.init(Cipher.ENCRYPT_MODE, key,new IvParameterSpec(IV.getBytes("UTF-8")));
    return cipher.doFinal(plainText.getBytes("UTF-8"));
    }

    public static String decrypt(byte[] cipherText, String encryptionKey) throws Exception{
    Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding", "SunJCE");
    SecretKeySpec key = new SecretKeySpec(encryptionKey.getBytes("UTF-8"), "AES");
    cipher.init(Cipher.DECRYPT_MODE, key,new IvParameterSpec(IV.getBytes("UTF-8")));
    return new String(cipher.doFinal(cipherText),"UTF-8");
    }
    }



    Why i can't change IV , plain text or key to be any thing except 16

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Neeeeeeeed Help

    Please edit your post and wrap your code with code tags:
    [code=java]
    YOUR CODE HERE
    [/code]
    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.