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/*
 * Copyright 2021 Siisise Net.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.siisise.security.digest;

import java.util.Arrays;
import net.siisise.security.io.BlockOutputStream;

/**
 * RFC 1319
 * @deprecated RFC 6149
 */
@Deprecated
public class MD2 extends BlockMessageDigest {

    static final String OID = "1.2.840.113549.2.2";

    // byte short int どれでもいい
    static final short[] S = {
        0x29, 0x2e, 0x43, 0xc9, 0xa2, 0xd8, 0x7c, 0x01, 0x3d, 0x36, 0x54, 0xa1, 0xec, 0xf0, 0x06, 0x13,
        0x62, 0xa7, 0x05, 0xf3, 0xc0, 0xc7, 0x73, 0x8c, 0x98, 0x93, 0x2b, 0xd9, 0xbc, 0x4c, 0x82, 0xca,
        0x1e, 0x9b, 0x57, 0x3c, 0xfd, 0xd4, 0xe0, 0x16, 0x67, 0x42, 0x6f, 0x18, 0x8a, 0x17, 0xe5, 0x12,
        0xbe, 0x4e, 0xc4, 0xd6, 0xda, 0x9e, 0xde, 0x49, 0xa0, 0xfb, 0xf5, 0x8e, 0xbb, 0x2f, 0xee, 0x7a,
        0xa9, 0x68, 0x79, 0x91, 0x15, 0xb2, 0x07, 0x3f, 0x94, 0xc2, 0x10, 0x89, 0x0b, 0x22, 0x5f, 0x21,
        0x80, 0x7f, 0x5d, 0x9a, 0x5a, 0x90, 0x32, 0x27, 0x35, 0x3e, 0xcc, 0xe7, 0xbf, 0xf7, 0x97, 0x03,
        0xff, 0x19, 0x30, 0xb3, 0x48, 0xa5, 0xb5, 0xd1, 0xd7, 0x5e, 0x92, 0x2a, 0xac, 0x56, 0xaa, 0xc6,
        0x4f, 0xb8, 0x38, 0xd2, 0x96, 0xa4, 0x7d, 0xb6, 0x76, 0xfc, 0x6b, 0xe2, 0x9c, 0x74, 0x04, 0xf1,
        0x45, 0x9d, 0x70, 0x59, 0x64, 0x71, 0x87, 0x20, 0x86, 0x5b, 0xcf, 0x65, 0xe6, 0x2d, 0xa8, 0x02,
        0x1b, 0x60, 0x25, 0xad, 0xae, 0xb0, 0xb9, 0xf6, 0x1c, 0x46, 0x61, 0x69, 0x34, 0x40, 0x7e, 0x0f,
        0x55, 0x47, 0xa3, 0x23, 0xdd, 0x51, 0xaf, 0x3a, 0xc3, 0x5c, 0xf9, 0xce, 0xba, 0xc5, 0xea, 0x26,
        0x2c, 0x53, 0x0d, 0x6e, 0x85, 0x28, 0x84, 0x09, 0xd3, 0xdf, 0xcd, 0xf4, 0x41, 0x81, 0x4d, 0x52,
        0x6a, 0xdc, 0x37, 0xc8, 0x6c, 0xc1, 0xab, 0xfa, 0x24, 0xe1, 0x7b, 0x08, 0x0c, 0xbd, 0xb1, 0x4a,
        0x78, 0x88, 0x95, 0x8b, 0xe3, 0x63, 0xe8, 0x6d, 0xe9, 0xcb, 0xd5, 0xfe, 0x3b, 0x00, 0x1d, 0x39,
        0xf2, 0xef, 0xb7, 0x0e, 0x66, 0x58, 0xd0, 0xe4, 0xa6, 0x77, 0x72, 0xf8, 0xeb, 0x75, 0x4b, 0x0a,
        0x31, 0x44, 0x50, 0xb4, 0x8f, 0xed, 0x1f, 0x1a, 0xdb, 0x99, 0x8d, 0x33, 0x9f, 0x11, 0x83, 0x14
    };

    private final byte[] c = new byte[16];
    private final byte[] x = new byte[48];
    private byte l;

    public MD2() {
        super("MD2");
        engineReset();
    }

    @Override
    protected int engineGetDigestLength() {
        return 16;
    }

    @Override
    public int getBitBlockLength() {
        return 128;
    }
    
    /**
     * length 不要
     * @param data
     * @param offset
     * @param length 
     */
    @Override
    public void engineUpdate(byte[] data, int offset, int length) {
        pac.write(data,offset,length);
    }

    @Override
    public void blockWrite(byte[] input, int offset, int len) {
        byte lc;
        int t;
    
        // Step 4.
        System.arraycopy(input, offset, x, 16, 16);
        for (int j = 0; j < 16; j++) {
            // Step 2.
            lc = x[16 + j];
            c[j] ^= S[(lc ^ l) & 0xff]; // RFC 1319 Errata
            l = c[j];

            // Step 4.
            x[32 + j] = (byte) (lc ^ x[j]);
        }
        t = 0;
        for (int j = 0; j < 18; j++) {
            for (int k = 0; k < 48; k++) {
                t = (x[k] ^ S[t & 0xff]);
                x[k] = (byte) t;
            }
            t = (t + j) & 0xff;
        }
    }

    @Override
    protected byte[] engineDigest() {
        // Step 1. padding
        int p = 16 - pac.size();
        byte[] padding = new byte[p];
        for (int i = 0; i < p; i++) {
            padding[i] = (byte) p;
        }
        engineUpdate(padding, 0, p); // ここまでStep 2. と Step 4. 並走
        // Step 2.
        engineUpdate(c, 0, 16); // Step 2を入力にまわして Step 4. のみ拾う

        byte[] ret = new byte[16];
        System.arraycopy(x, 0, ret, 0, 16);
        engineReset();
        return ret;
    }

    @Override
    protected final void engineReset() {
        pac = new BlockOutputStream(this);
        l = 0;
        Arrays.fill(c,(byte)0);
        // Step 3.
        Arrays.fill(x,(byte)0);
    }

}