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Built on the nucleus of TweetNaCl, TweetPepper provides contemporary key formats, key protection using SCrypt/SecretBox, digital signature support scheme featuring CubeHash, key encapsulation using Salsa20, and other useful features you probably want anyway.

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//
//  Copyright (c) 2011, Neil Alexander T.
//  All rights reserved.
// 
//  Redistribution and use in source and binary forms, with
//  or without modification, are permitted provided that the following
//  conditions are met:
// 
//  - Redistributions of source code must retain the above copyright notice,
//    this list of conditions and the following disclaimer.
//  - Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
// 
//  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
//  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
//  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
//  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
//  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
//  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
//  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
//  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
//  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
//  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
//  POSSIBILITY OF SUCH DAMAGE.
//

package com.cryptoregistry.tweet.salt.stream;

public class XSalsa20 extends HSalsa20 {
	
	public final int CRYPTO_STREAM_XSALSA20_REF_KEYBYTES = 32;
	public final int CRYPTO_STREAM_XSALSA20_REF_NONCEBYTES = 24;

	public final static byte[] sigma = { (byte) 'e', (byte) 'x', (byte) 'p',
			(byte) 'a', (byte) 'n', (byte) 'd', (byte) ' ', (byte) '3',
			(byte) '2', (byte) '-', (byte) 'b', (byte) 'y', (byte) 't',
			(byte) 'e', (byte) ' ', (byte) 'k' };

	
	public int crypto_stream(byte[] c, int clen, byte[] n, byte[] k) {
		byte[] subkey = new byte[32];

		super.crypto_core(subkey, n, k, sigma);
		return super.crypto_stream(c, clen, n, 16, subkey);
	}

	public int crypto_stream_xor(byte[] c, byte[] m, long mlen, byte[] n,
			byte[] k) {
		byte[] subkey = new byte[32];

		super.crypto_core(subkey, n, k, sigma);
		return super.crypto_stream_xor(c, m, (int) mlen, n, 16, subkey);
	}
}