Topic: get the 12th word seed (Read 192 times)

import org.bitcoinj.core.Utils;
import org.bitcoinj.crypto.MnemonicCode;

import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.*;

public class Find12 {

    private static final int TARGET_SIZE = 12;
    private static List WORDS;
    private static MessageDigest SHA256;
    private static int CONCAT_LEN_BITS;
    private static int CONCAT_LEN_BITS_DIV_33;
    private static int CONCAT_LEN_BITS_MINUS_CONCAT_LEN_BITS_DIV_33;
    private static int CONCAT_LEN_BITS_MINUS_CONCAT_LEN_BITS_DIV_33__DIV8;

    public static void main(String args[]) throws IOException {
        String[] input = new String[]{"faith","always","acquire","host","amused",
                "mercy","horn","service","series","stove","off"};
        Find12 find12 = new Find12();
        find12.findSeed(input);
    }

    public Find12() throws IOException {
        WORDS =  new MnemonicCode().getWordList();
        try {
            SHA256 = MessageDigest.getInstance("SHA-256");
        } catch (NoSuchAlgorithmException var1) {
            throw new RuntimeException(var1);
        }
        this.CONCAT_LEN_BITS = 11 * TARGET_SIZE;
        this.CONCAT_LEN_BITS_DIV_33 = CONCAT_LEN_BITS/33;
        this.CONCAT_LEN_BITS_MINUS_CONCAT_LEN_BITS_DIV_33 =  CONCAT_LEN_BITS - CONCAT_LEN_BITS_DIV_33;
        this.CONCAT_LEN_BITS_MINUS_CONCAT_LEN_BITS_DIV_33__DIV8 = CONCAT_LEN_BITS_MINUS_CONCAT_LEN_BITS_DIV_33/8;
    }

    private void findSeed(String[] input) {
        for(int i=0; i            List seed = new ArrayList<>(Arrays.asList(input));
            seed.add(WORDS.get(i));
            if (checksumCheck(seed)){
                System.out.println(Utils.SPACE_JOINER.join(seed));
            }
        }
    }

    private boolean checksumCheck(List words){
        boolean[] concatBits = new boolean[CONCAT_LEN_BITS];
        int wordindex = 0;

        int hash;
        for(Iterator checksumLengthBits = words.iterator(); checksumLengthBits.hasNext(); ++wordindex) {
            String entropyLengthBits = (String)checksumLengthBits.next();
            int entropy = Collections.binarySearch(WORDS, entropyLengthBits);
            if(entropy < 0) {
                return false;
            }
            for(hash = 0; hash < 11; ++hash) {
                concatBits[wordindex * 11 + hash] = (entropy & 1 << 10 - hash) != 0;
            }
        }

        byte[] var13 = new byte[CONCAT_LEN_BITS_MINUS_CONCAT_LEN_BITS_DIV_33__DIV8];

        for(hash = 0; hash < var13.length; ++hash) {
            for(int hashBits = 0; hashBits < 8; ++hashBits) {
                if(concatBits[hash * 8 + hashBits]) {
                    var13[hash] = (byte)(var13[hash] | 1 << 7 - hashBits);
                }
            }
        }

        byte[] var14 = hash(var13, 0, var13.length, SHA256);
        boolean[] var15 = bytesToBits(var14);

        for(int i = 0; i < CONCAT_LEN_BITS_DIV_33; ++i) {
            if(concatBits[CONCAT_LEN_BITS_MINUS_CONCAT_LEN_BITS_DIV_33 + i] != var15[i]) {
                return false;
            }
        }
        return true;
    }
    private boolean[] bytesToBits(byte[] data) {
        boolean[] bits = new boolean[data.length * 8];

        for(int i = 0; i < data.length; ++i) {
            for(int j = 0; j < 8; ++j) {
                bits[i * 8 + j] = (data[i] & 1 << 7 - j) != 0;
            }
        }
        return bits;
    }
    public byte[] hash(byte[] input, int offset, int length, MessageDigest sha256) {
        sha256.reset();
        sha256.update(input, offset, length);
        return sha256.digest();
    }
}

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