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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 net.siisise.lang.Bin;
import net.siisise.security.io.BlockOutputStream;

/**
 * RFC 1321 MD5の実装.
 * @deprecated RFC 6151 署名禁止 RFC 6331 歴史的 RFC 9155 TLS 1.2 DTLS 1.2 脆弱
 */
@Deprecated
public class MD5 extends BlockMessageDigest {

    public static String OBJECTIDENTIFIER = "1.2.840.113549.2.5";

    private final int digestLength;
    private int[] ad;

    static final int[] S1 = {7, 22, 17, 12};
    static final int[] S2 = {5, 20, 14, 9};
    static final int[] S3 = {4, 23, 16, 11};
    static final int[] S4 = {6, 21, 15, 10};
    static final int[] K = {
        0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
        0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
        0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
        0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,

        0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
        0xd62f105d, 0x2441453, 0xd8a1e681, 0xe7d3fbc8,
        0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
        0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,

        0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
        0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
        0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x4881d05,
        0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,

        0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,
        0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
        0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
        0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
    };
    
    static final int[] xi = new int[64];
    
    static {
        for ( int i = 0; i < 16; i++ ) {
//            xi[i] = i;
            xi[i+16] = (i * 5 + 1) & 0x0f;
            xi[i+32] = (i * 3 + 5) & 0x0f;
            xi[i+48] = (i * 7) & 0x0f;
        }
    }
    
    public MD5() {
        super("MD5");
        digestLength = 128 / 8;
        engineReset();
    }

    /**
     * 特定の長さのMD5.
     * @param len 8の倍数bit 8 から 128 まで
     */
    public MD5(int len) {
        super("MD5-" + len);
        if ( len < 8 || len > 128 ) {
            throw new SecurityException();
        }
        digestLength = len / 8;
        engineReset();
    }

    @Override
    protected int engineGetDigestLength() {
        return digestLength;
    }
    
    @Override
    public int getBitBlockLength() {
        return 512;
    }

    @Override
    protected void engineReset() {
        ad = new int[]{0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476};
        length = 0;
        pac = new BlockOutputStream(this);
    }

    private void abcdf(int m, int i) {
        int e = -i & 3;
        int f = (1 - i) & 3;
        int b = ad[f];
        int c = ad[e ^ 2];
        int d = ad[f ^ 2];
        m += ad[e] + ((b & c) | ~b & d) + K[i];
        d = S1[e];
        ad[e] = ((m << d) | (m >>> (32 - d))) + b;
    }

    private void abcdg(int m, int i) {
        int e = -i & 3;
        int f = (1 - i) & 3;
        int b = ad[f];
        int c = ad[e ^ 2];
        int d = ad[f ^ 2];
        m += ad[e] + ((b & d) | (~d & c)) + K[i];
        d = S2[e];
        ad[e] = ((m << d) | (m >>> (32 - d))) + b;
    }

    private void abcdh(int m, int i) {
        int e = -i & 3;
        int f = (1 - i) & 3;
        int b = ad[f];
        int c = ad[e ^ 2];
        int d = ad[f ^ 2];
        m += ad[e] + (b ^ c ^ d) + K[i];
        d = S3[e];
        ad[e] = ((m << d) | (m >>> (32 - d))) + b;
    }

    private void abcdi(int m, int i) {
        int e = -i & 3;
        int b = ad[(1 - i) & 3];
        int c = ad[e ^ 2];
        int d = ad[(3 - i) & 3];
        m += ad[e] + (c ^ (b | ~d)) + K[i];
        d = S4[e];
        ad[e] = ((m << d) | (m >>> (32 - d))) + b;
    }

    int x[] = new int[16];
    
    @Override
    public void blockWrite(byte[] input, int offset, int len) {

        int aa, bb, cc, dd;
        aa = ad[0];
        bb = ad[1];
        cc = ad[2];
        dd = ad[3];

        Bin.btoli(input, offset, x, 16);

        /* Round 1. */
        for (int i = 0; i < 16; i++) {
            abcdf(x[i], i);
        }
        /* Round 2. */
        for (int i = 16; i < 32; i++) {
            abcdg(x[xi[i]], i);
        }
        /* Round 3. */
        for (int i = 32; i < 48; i++) {
            abcdh(x[xi[i]], i);
        }
        /* Round 4. */
        for (int i = 48; i < 64; i++) {
            abcdi(x[xi[i]], i);
        }

        ad[0] += aa;
        ad[1] += bb;
        ad[2] += cc;
        ad[3] += dd;
    }

    @Override
    protected byte[] engineDigest() {

        long len = length;

        // ラスト周
        // padding
        pac.write(new byte[]{(byte) 0x80});
        int padlen = 512 - (int) ((len + 64 + 8) % 512);
        pac.write(new byte[padlen / 8]);
        byte[] lena = new byte[8];
        for (int i = 0; i < 8; i++) {
            lena[i] = (byte) len;
            len >>>= 8;
        }

        pac.write(lena, 0, lena.length);

        byte[] ret = new byte[digestLength];
        for (int i = 0; i < digestLength; i++) {
            ret[i] = (byte) (ad[i / 4] >>> ((i & 3) * 8));
        }
        engineReset();
        return ret;
    }
}