net.siisise.security.digest.RIPEMD Maven / Gradle / Ivy

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/*
 * Copyright 2024 okome.
 *
 * 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;

/**
 * RACE Integrity Primitives Evalution Message Digest
 * 
 * RIPEMD (オリジナル128bit) 1996年
 * RIPEMD-128 (改良)
 * RIPEMD-160
 * RIPEMD-256
 * RIPEMD-320
 * 
 * @deprecated セキュリティ的に推奨しない 実装まだ
 */
@Deprecated
public class RIPEMD extends BlockMessageDigest {

    int len = 20;
    int[] ad;
    
    public RIPEMD() {
        super("RIPEMD"); // オリジナル?
    }
    
    public RIPEMD(String name) {
        super(name);
        if ( name.startsWith("RIPEMD-")) {
            len = Integer.parseInt(name.substring(7)) / 8;
        }
    }
    
    @Override
    protected int engineGetDigestLength() {
        return len;
    }
    
    @Override
    public int getBitBlockLength() {
        return 512;
        
    }

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

    @Override
    protected void engineReset() {
        ad = new int[]{0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476, 0xc3d2e1f0};
        length = 0;
        pac = new BlockOutputStream(this);
    }

    @Override
    public void blockWrite(byte[] src, int offset, int length) {
        
        int[] s = Bin.btoli(src,offset,length);
        
        for ( int i  = 0; i < 16; i++ ) { // Round 1
            
        }
        for ( int i = 16; i < 32; i++ ) { // Round 2
            
        }
        for ( int i = 32; i < 48; i++ ) { // Round 3
            
        }
        for ( int i = 48; i < 64; i++ ) { // Round 4
            
        }
        for ( int i = 64; i < 80; i++ ) { // Round 5
            
        }
        throw new UnsupportedOperationException("Not supported yet.");
    }

}