Encryption between Java and C #

Question

Hi, I am trying to understand how to replicate encryption of text executed in C # but in Java. the piece of code that still puzzles me and cannot find the answer to this in C #:

PasswordDeriveBytes myPass = new PasswordDeriveBytes(String Password, byte[] Salt);
Trp.Key = myPass.GetBytes(24);
Trp.IV = myPass.GetBytes(8);

Basically, what would be the equivalent of this code in Java? The UPDATE: . Using the provided code for PasswordDeriveBytes (second snippet), I was able to fully reproduce the C # code. Thanks, Maarten Bodes.

BASE64Encoder base64 = new BASE64Encoder();
PasswordDeriveBytes i_Pass = new PasswordDeriveBytes(passWord, saltWordAsBytes);
byte[] keyBytes = i_Pass.getBytes(24);
byte[] ivBytes = i_Pass.getBytes(8);
Cipher c3des = Cipher.getInstance("DESede/CBC/PKCS5Padding");
SecretKeySpec myKey = new SecretKeySpec(keyBytes, "DESede");
IvParameterSpec ivspec = new IvParameterSpec(ivBytes);
c3des.init (Cipher.ENCRYPT_MODE, myKey, ivspec);
encrytpedTextAsByte  = c3des.doFinal(plainTextAsBytes);
encryptedText  = base64.encode(encrytpedTextAsByte);

but it may not seem like it is running on a platform. basically the decoding code is set (I can't change C # 3.5) and I'm trying to encode in java so that C # code can decode it.

Any help would be greatly appreciated.

Answer 1

, PasswordDeriveBytes 20 - PBKDF1 ( not 2, Java-). getBytes . getBytes 20 Microsoft . Mono , .

RFC2898DeriveBytes, PBKDF2. ASCII Java.

Microsoft PasswordDeriveBytes PBKDF1 ( 20 ). Mono .

Microsoft API . , .

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Microsoft. PBKDF-1 , , HX. 20 , PBKDF1. ASCII , 1 ( "1", 0x31), HX.

, Mono:

public class PasswordDeriveBytes {

    private final MessageDigest hash;
    private final byte[] initial;
    private final int iterations;

    private byte[] output;
    private int hashnumber = 0;
    private int position = 0;

    public PasswordDeriveBytes(String password, byte[] salt) {
        try {
            this.hash = MessageDigest.getInstance("SHA-1");
            this.initial = new byte[hash.getDigestLength()];
            this.hash.update(password.getBytes(UTF_8));
            this.hash.update(salt);
            this.hash.digest(this.initial, 0, this.initial.length);
            this.iterations = 100;
        } catch (NoSuchAlgorithmException | DigestException e) {
            throw new IllegalStateException(e);
        }
    }

    public byte[] getBytes(int cb) {
        if (cb < 1)
            throw new IndexOutOfBoundsException("cb");
        byte[] result = new byte[cb];
        int cpos = 0;
        // the initial hash (in reset) + at least one iteration
        int iter = Math.max(1, iterations - 1);
        // start with the PKCS5 key
        if (output == null) {
            // calculate the PKCS5 key
            output = initial;
            // generate new key material
            for (int i = 0; i < iter - 1; i++)
                output = hash.digest(output);
        }
        while (cpos < cb) {
            byte[] output2 = null;
            if (hashnumber == 0) {
                // last iteration on output
                output2 = hash.digest(output);
            } else if (hashnumber < 1000) {
                String n = String.valueOf(hashnumber);
                output2 = new byte[output.length + n.length()];
                for (int j = 0; j < n.length(); j++)
                    output2[j] = (byte) (n.charAt(j));
                System.arraycopy(output, 0, output2, n.length(), output.length);
                // don't update output
                output2 = hash.digest(output2);
            } else {
                throw new SecurityException();
            }
            int rem = output2.length - position;
            int l = Math.min(cb - cpos, rem);
            System.arraycopy(output2, position, result, cpos, l);
            cpos += l;
            position += l;
            while (position >= output2.length) {
                position -= output2.length;
                hashnumber++;
            }
        }
        return result;
    }
}

, , , :

public class PasswordDeriveBytes {

    private final MessageDigest hash;

    private final byte[] firstToLastDigest;
    private final byte[] outputBuffer;

    private int position = 0;

    public PasswordDeriveBytes(String password, byte[] salt) {
        try {
            this.hash = MessageDigest.getInstance("SHA-1");

            this.hash.update(password.getBytes(UTF_8));
            this.hash.update(salt);
            this.firstToLastDigest = this.hash.digest();

            final int iterations = 100;
            for (int i = 1; i < iterations - 1; i++) {
                hash.update(firstToLastDigest);
                hash.digest(firstToLastDigest, 0, firstToLastDigest.length);
            }

            this.outputBuffer = hash.digest(firstToLastDigest);

        } catch (NoSuchAlgorithmException | DigestException e) {
            throw new IllegalStateException("SHA-1 digest should always be available", e);
        }
    }

    public byte[] getBytes(int requested) {
        if (requested < 1) {
            throw new IllegalArgumentException(
                    "You should at least request 1 byte");
        }

        byte[] result = new byte[requested];

        int generated = 0;

        try {
            while (generated < requested) {
                final int outputOffset = position % outputBuffer.length;
                if (outputOffset == 0 && position != 0) {
                    final String counter = String.valueOf(position / outputBuffer.length);
                    hash.update(counter.getBytes(US_ASCII));
                    hash.update(firstToLastDigest);
                    hash.digest(outputBuffer, 0, outputBuffer.length);
                }

                final int left = outputBuffer.length - outputOffset;
                final int required = requested - generated;
                final int copy = Math.min(left, required);

                System.arraycopy(outputBuffer, outputOffset, result, generated, copy);

                generated += copy;
                position += copy;
            }
        } catch (final DigestException e) {
            throw new IllegalStateException(e);
        }
        return result;
    }
}

, . , . , Microsoft PasswordDeriveBytes, (. ). .

:

private static final String PASSWORD = "46dkaKLKKJLjdkdk;akdjafj";

private static final byte[] SALT = { 0x26, 0x19, (byte) 0x81, 0x4E,
        (byte) 0xA0, 0x6D, (byte) 0x95, 0x34 };

public static void main(String[] args) throws Exception {
    final Cipher desEDE = Cipher.getInstance("DESede/CBC/PKCS5Padding");

    final PasswordDeriveBytes myPass = new PasswordDeriveBytes(PASSWORD, SALT);
    final SecretKeyFactory kf = SecretKeyFactory.getInstance("DESede");
    final byte[] key = myPass.getBytes(192 / Byte.SIZE);
    final SecretKey desEDEKey = kf.generateSecret(new DESedeKeySpec(key));

    final byte[] iv = myPass.getBytes(desEDE.getBlockSize());

    desEDE.init(Cipher.ENCRYPT_MODE, desEDEKey, new IvParameterSpec(iv));

    final byte[] ct = desEDE.doFinal("owlstead".getBytes(US_ASCII));
}

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Java:

• , 1, 4K
• , 3 * 64 = 192 196
• 3DES , AES