221 lines
10 KiB
Java
221 lines
10 KiB
Java
package com.luminiasoft.bitshares;
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import com.google.gson.JsonArray;
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import com.google.gson.JsonObject;
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import com.google.gson.JsonParser;
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import com.luminiasoft.bitshares.crypto.AndroidRandomSource;
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import com.luminiasoft.bitshares.crypto.SecureRandomStrengthener;
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import java.io.UnsupportedEncodingException;
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import java.math.BigInteger;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import java.security.SecureRandom;
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import java.util.Arrays;
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import org.bitcoinj.core.ECKey;
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import org.spongycastle.crypto.DataLengthException;
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import org.spongycastle.crypto.InvalidCipherTextException;
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import org.spongycastle.crypto.engines.AESFastEngine;
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import org.spongycastle.crypto.modes.CBCBlockCipher;
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import org.spongycastle.crypto.paddings.PaddedBufferedBlockCipher;
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import org.spongycastle.crypto.params.KeyParameter;
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import org.spongycastle.crypto.params.ParametersWithIV;
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/**
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* Class to manage the Bin Files
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*
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* @author Henry Varona
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*/
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public abstract class FileBin {
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/**
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* Method to get the brainkey fron an input of bytes
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*
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* @param input Array of bytes of the file to be processed
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* @param password the pin code
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* @return the brainkey file, or null if the file or the password are
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* incorrect
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*/
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public static String getBrainkeyFromByte(byte[] input, String password) {
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try {
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byte[] publicKey = new byte[33];
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byte[] rawDataEncripted = new byte[input.length-33];
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System.arraycopy(input, 0, publicKey, 0, publicKey.length);
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System.arraycopy(input, 33, rawDataEncripted, 0, rawDataEncripted.length);
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MessageDigest md = MessageDigest.getInstance("SHA-256");
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ECKey randomECKey = ECKey.fromPublicOnly(publicKey);
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byte[] finalKey = randomECKey.getPubKeyPoint().multiply(ECKey.fromPrivate(md.digest(password.getBytes("UTF-8"))).getPrivKey()).normalize().getXCoord().getEncoded();
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MessageDigest md1 = MessageDigest.getInstance("SHA-512");
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finalKey = md1.digest(finalKey);
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byte[] rawData = decryptAES(rawDataEncripted, byteToString(finalKey).getBytes());
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byte[] checksum = new byte[4];
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System.arraycopy(rawData, 0, checksum, 0, 4);
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byte[] compressedData = new byte[rawData.length - 4];
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System.arraycopy(rawData, 4, compressedData, 0, compressedData.length);
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System.out.println("Despues:"+byteToString(compressedData));
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byte[] wallet_object_bytes = Util.decompress(compressedData, Util.XZ);
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String wallet_string = new String(wallet_object_bytes, "UTF-8");
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JsonObject wallet = new JsonParser().parse(wallet_string).getAsJsonObject();
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if (wallet.get("wallet").isJsonArray()) {
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wallet = wallet.get("wallet").getAsJsonArray().get(0).getAsJsonObject();
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} else {
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wallet = wallet.get("wallet").getAsJsonObject();
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}
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byte[] encKey_enc = new BigInteger(wallet.get("encryption_key").getAsString(), 16).toByteArray();
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byte[] temp = new byte[encKey_enc.length - (encKey_enc[0] == 0 ? 1 : 0)];
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System.arraycopy(encKey_enc, (encKey_enc[0] == 0 ? 1 : 0), temp, 0, temp.length);
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byte[] encKey = decryptAES(temp, password.getBytes("UTF-8"));
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temp = new byte[encKey.length - 16];
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System.arraycopy(encKey, 0, temp, 0, temp.length);
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byte[] encBrain = new BigInteger(wallet.get("encrypted_brainkey").getAsString(), 16).toByteArray();
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while(encBrain[0] == 0){
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byte[]temp2 = new byte[encBrain.length-1];
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System.arraycopy(encBrain, 1, temp2, 0, temp2.length);
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encBrain = temp2;
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}
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String BrainKey = new String((decryptAES(encBrain, temp)), "UTF-8");
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return BrainKey;
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} catch (UnsupportedEncodingException | NoSuchAlgorithmException ex) {
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}
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return null;
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}
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/**
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* Method to generate the file form a brainkey
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*
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* @param BrainKey The input brainkey
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* @param password The pin code
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* @param accountName The Account Name
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* @return The array byte of the file, or null if an error happens
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*/
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public static byte[] getBytesFromBrainKey(String BrainKey, String password, String accountName) {
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try {
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byte[] encKey = new byte[32];
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SecureRandomStrengthener randomStrengthener = SecureRandomStrengthener.getInstance();
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//randomStrengthener.addEntropySource(new AndroidRandomSource());
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SecureRandom secureRandom = randomStrengthener.generateAndSeedRandomNumberGenerator();
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secureRandom.nextBytes(encKey);
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byte[] encKey_enc = encryptAES(encKey, password.getBytes("UTF-8"));
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byte[] encBrain = encryptAES(BrainKey.getBytes("ASCII"), encKey);
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/**
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* Data to Store
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*/
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JsonObject wallet = new JsonObject();
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wallet.add("encryption_key", new JsonParser().parse(byteToString(encKey_enc)));
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wallet.add("encrypted_brainkey", new JsonParser().parse(byteToString(encBrain)));
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JsonObject wallet_object = new JsonObject();
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wallet_object.add("wallet", wallet);
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JsonArray accountNames = new JsonArray();
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JsonObject jsonAccountName = new JsonObject();
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jsonAccountName.add("name", new JsonParser().parse(accountName));
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accountNames.add(jsonAccountName);
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wallet_object.add("linked_accounts", accountNames);
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byte[] compressedData = Util.compress(wallet_object.toString().getBytes("UTF-8"), Util.XZ);
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System.out.println("Antes:"+byteToString(compressedData));
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MessageDigest md = MessageDigest.getInstance("SHA-256");
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byte[] checksum = md.digest(compressedData);
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byte[] rawData = new byte[compressedData.length + 4];
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System.arraycopy(checksum, 0, rawData, 0, 4);
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System.arraycopy(compressedData, 0, rawData, 4, compressedData.length);
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byte[] randomKey = new byte[32];
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secureRandom.nextBytes(randomKey);
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ECKey randomECKey = ECKey.fromPrivate(md.digest(randomKey));
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byte[] randPubKey = randomECKey.getPubKey();
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byte[] finalKey = randomECKey.getPubKeyPoint().multiply(ECKey.fromPrivate(md.digest(password.getBytes("UTF-8"))).getPrivKey()).normalize().getXCoord().getEncoded();
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MessageDigest md1 = MessageDigest.getInstance("SHA-512");
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finalKey = md1.digest(finalKey);
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rawData = encryptAES(rawData, byteToString(finalKey).getBytes());
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byte[] result = new byte[rawData.length + randPubKey.length];
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System.arraycopy(randPubKey, 0, result, 0, randPubKey.length);
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System.arraycopy(rawData, 0, result, randPubKey.length, rawData.length);
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return result;
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} catch (UnsupportedEncodingException | NoSuchAlgorithmException ex) {
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}
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return null;
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}
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private static byte[] encryptAES(byte[] input, byte[] key) {
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try {
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MessageDigest md = MessageDigest.getInstance("SHA-512");
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byte[] result = md.digest(key);
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byte[] ivBytes = new byte[16];
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System.arraycopy(result, 32, ivBytes, 0, 16);
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byte[] sksBytes = new byte[32];
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System.arraycopy(result, 0, sksBytes, 0, 32);
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PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESFastEngine()));
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cipher.init(true, new ParametersWithIV(new KeyParameter(sksBytes), ivBytes));
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byte[] temp = new byte[input.length + (16 - (input.length % 16))];
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System.arraycopy(input, 0, temp, 0, input.length);
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Arrays.fill(temp, input.length, temp.length, (byte) (16 - (input.length % 16)));
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byte[] out = new byte[cipher.getOutputSize(temp.length)];
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int proc = cipher.processBytes(temp, 0, temp.length, out, 0);
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cipher.doFinal(out, proc);
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temp = new byte[out.length - 16];
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System.arraycopy(out, 0, temp, 0, temp.length);
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return temp;
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} catch (NoSuchAlgorithmException | DataLengthException | IllegalStateException | InvalidCipherTextException ex) {
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}
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return null;
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}
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private static byte[] decryptAES(byte[] input, byte[] key) {
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try {
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MessageDigest md = MessageDigest.getInstance("SHA-512");
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byte[] result = md.digest(key);
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byte[] ivBytes = new byte[16];
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System.arraycopy(result, 32, ivBytes, 0, 16);
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byte[] sksBytes = new byte[32];
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System.arraycopy(result, 0, sksBytes, 0, 32);
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PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESFastEngine()));
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cipher.init(false, new ParametersWithIV(new KeyParameter(sksBytes), ivBytes));
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byte[] pre_out = new byte[cipher.getOutputSize(input.length)];
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int proc = cipher.processBytes(input, 0, input.length, pre_out, 0);
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int proc2 = cipher.doFinal(pre_out, proc);
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byte[] out = new byte[proc+proc2];
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System.arraycopy(pre_out, 0, out, 0, proc+proc2);
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//Unpadding
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int count = out[out.length-1];
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byte[] temp = new byte[count];
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System.arraycopy(out, out.length - count, temp, 0, temp.length);
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byte[] temp2 = new byte[count];
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Arrays.fill(temp2, (byte) count);
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if (Arrays.equals(temp, temp2)) {
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temp = new byte[out.length - count];
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System.arraycopy(out, 0, temp, 0, out.length - count);
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return temp;
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} else {
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return out;
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}
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} catch (NoSuchAlgorithmException | DataLengthException | IllegalStateException | InvalidCipherTextException ex) {
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ex.printStackTrace();
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}
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return null;
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}
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public static String byteToString(byte[] input) {
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StringBuilder result = new StringBuilder();
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for (byte in : input) {
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if ((in & 0xff) < 0x10) {
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result.append("0");
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}
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result.append(Integer.toHexString(in & 0xff));
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}
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return result.toString();
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}
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}
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