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First class memo implementation

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This commit is contained in:
Henry Varona 2016-12-04 21:23:52 -04:00 committed by Nelson R. Perez
parent 67eb4953d0
commit 9d19607899
3 changed files with 190 additions and 90 deletions
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93
src/main/java/com/luminiasoft/bitshares/FileBin.java
View file

@ -49,14 +49,13 @@ public abstract class FileBin {
byte[] finalKey = randomECKey.getPubKeyPoint().multiply(ECKey.fromPrivate(md.digest(password.getBytes("UTF-8"))).getPrivKey()).normalize().getXCoord().getEncoded();
MessageDigest md1 = MessageDigest.getInstance("SHA-512");
finalKey = md1.digest(finalKey);
byte[] rawData = decryptAES(rawDataEncripted, byteToString(finalKey).getBytes());
byte[] rawData = Util.decryptAES(rawDataEncripted, Util.byteToString(finalKey).getBytes());
byte[] checksum = new byte[4];
System.arraycopy(rawData, 0, checksum, 0, 4);
byte[] compressedData = new byte[rawData.length - 4];
System.arraycopy(rawData, 4, compressedData, 0, compressedData.length);
System.out.println("Despues:"+byteToString(compressedData));
byte[] wallet_object_bytes = Util.decompress(compressedData, Util.XZ);
String wallet_string = new String(wallet_object_bytes, "UTF-8");
JsonObject wallet = new JsonParser().parse(wallet_string).getAsJsonObject();
@ -69,7 +68,7 @@ public abstract class FileBin {
byte[] encKey_enc = new BigInteger(wallet.get("encryption_key").getAsString(), 16).toByteArray();
byte[] temp = new byte[encKey_enc.length - (encKey_enc[0] == 0 ? 1 : 0)];
System.arraycopy(encKey_enc, (encKey_enc[0] == 0 ? 1 : 0), temp, 0, temp.length);
byte[] encKey = decryptAES(temp, password.getBytes("UTF-8"));
byte[] encKey = Util.decryptAES(temp, password.getBytes("UTF-8"));
temp = new byte[encKey.length];
System.arraycopy(encKey, 0, temp, 0, temp.length);
@ -79,7 +78,7 @@ public abstract class FileBin {
System.arraycopy(encBrain, 1, temp2, 0, temp2.length);
encBrain = temp2;
}
String BrainKey = new String((decryptAES(encBrain, temp)), "UTF-8");
String BrainKey = new String((Util.decryptAES(encBrain, temp)), "UTF-8");
return BrainKey;
@ -105,15 +104,15 @@ public abstract class FileBin {
//randomStrengthener.addEntropySource(new AndroidRandomSource());
SecureRandom secureRandom = randomStrengthener.generateAndSeedRandomNumberGenerator();
secureRandom.nextBytes(encKey);
byte[] encKey_enc = encryptAES(encKey, password.getBytes("UTF-8"));
byte[] encBrain = encryptAES(BrainKey.getBytes("ASCII"), encKey);
byte[] encKey_enc = Util.encryptAES(encKey, password.getBytes("UTF-8"));
byte[] encBrain = Util.encryptAES(BrainKey.getBytes("ASCII"), encKey);
/**
* Data to Store
*/
JsonObject wallet = new JsonObject();
wallet.add("encryption_key", new JsonParser().parse(byteToString(encKey_enc)));
wallet.add("encrypted_brainkey", new JsonParser().parse(byteToString(encBrain)));
wallet.add("encryption_key", new JsonParser().parse(Util.byteToString(encKey_enc)));
wallet.add("encrypted_brainkey", new JsonParser().parse(Util.byteToString(encBrain)));
JsonObject wallet_object = new JsonObject();
wallet_object.add("wallet", wallet);
JsonArray accountNames = new JsonArray();
@ -122,7 +121,6 @@ public abstract class FileBin {
accountNames.add(jsonAccountName);
wallet_object.add("linked_accounts", accountNames);
byte[] compressedData = Util.compress(wallet_object.toString().getBytes("UTF-8"), Util.XZ);
System.out.println("Antes:"+byteToString(compressedData));
MessageDigest md = MessageDigest.getInstance("SHA-256");
byte[] checksum = md.digest(compressedData);
byte[] rawData = new byte[compressedData.length + 4];
@ -135,7 +133,7 @@ public abstract class FileBin {
byte[] finalKey = randomECKey.getPubKeyPoint().multiply(ECKey.fromPrivate(md.digest(password.getBytes("UTF-8"))).getPrivKey()).normalize().getXCoord().getEncoded();
MessageDigest md1 = MessageDigest.getInstance("SHA-512");
finalKey = md1.digest(finalKey);
rawData = encryptAES(rawData, byteToString(finalKey).getBytes());
rawData = Util.encryptAES(rawData, Util.byteToString(finalKey).getBytes());
byte[] result = new byte[rawData.length + randPubKey.length];
System.arraycopy(randPubKey, 0, result, 0, randPubKey.length);
@ -149,80 +147,5 @@ public abstract class FileBin {
return null;
}
private static byte[] encryptAES(byte[] input, byte[] key) {
try {
MessageDigest md = MessageDigest.getInstance("SHA-512");
byte[] result = md.digest(key);
byte[] ivBytes = new byte[16];
System.arraycopy(result, 32, ivBytes, 0, 16);
byte[] sksBytes = new byte[32];
System.arraycopy(result, 0, sksBytes, 0, 32);
PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESFastEngine()));
cipher.init(true, new ParametersWithIV(new KeyParameter(sksBytes), ivBytes));
byte[] temp = new byte[input.length + (16 - (input.length % 16))];
System.arraycopy(input, 0, temp, 0, input.length);
Arrays.fill(temp, input.length, temp.length, (byte) (16 - (input.length % 16)));
byte[] out = new byte[cipher.getOutputSize(temp.length)];
int proc = cipher.processBytes(temp, 0, temp.length, out, 0);
cipher.doFinal(out, proc);
temp = new byte[out.length - 16];
System.arraycopy(out, 0, temp, 0, temp.length);
return temp;
} catch (NoSuchAlgorithmException | DataLengthException | IllegalStateException | InvalidCipherTextException ex) {
}
return null;
}
private static byte[] decryptAES(byte[] input, byte[] key) {
try {
MessageDigest md = MessageDigest.getInstance("SHA-512");
byte[] result = md.digest(key);
byte[] ivBytes = new byte[16];
System.arraycopy(result, 32, ivBytes, 0, 16);
byte[] sksBytes = new byte[32];
System.arraycopy(result, 0, sksBytes, 0, 32);
PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESFastEngine()));
cipher.init(false, new ParametersWithIV(new KeyParameter(sksBytes), ivBytes));
byte[] pre_out = new byte[cipher.getOutputSize(input.length)];
int proc = cipher.processBytes(input, 0, input.length, pre_out, 0);
int proc2 = cipher.doFinal(pre_out, proc);
byte[] out = new byte[proc+proc2];
System.arraycopy(pre_out, 0, out, 0, proc+proc2);
//Unpadding
byte countByte = (byte)((byte)out[out.length-1] % 16);
int count = countByte & 0xFF;
if ((count > 15) || (count <= 0)){
return out;
}
byte[] temp = new byte[count];
System.arraycopy(out, out.length - count, temp, 0, temp.length);
byte[] temp2 = new byte[count];
Arrays.fill(temp2, (byte) count);
if (Arrays.equals(temp, temp2)) {
temp = new byte[out.length - count];
System.arraycopy(out, 0, temp, 0, out.length - count);
return temp;
} else {
return out;
}
} catch (NoSuchAlgorithmException | DataLengthException | IllegalStateException | InvalidCipherTextException ex) {
ex.printStackTrace();
}
return null;
}
public static String byteToString(byte[] input) {
StringBuilder result = new StringBuilder();
for (byte in : input) {
if ((in & 0xff) < 0x10) {
result.append("0");
}
result.append(Integer.toHexString(in & 0xff));
}
return result.toString();
}
}

74
src/main/java/com/luminiasoft/bitshares/Memo.java
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@ -1,15 +1,89 @@
package com.luminiasoft.bitshares;
import com.luminiasoft.bitshares.crypto.SecureRandomStrengthener;
import com.luminiasoft.bitshares.interfaces.ByteSerializable;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import org.bitcoinj.core.ECKey;
/**
* Created by nelson on 11/9/16.
*/
public class Memo implements ByteSerializable {
//TODO: Give this class a proper implementation
private byte[] from;
private byte[] to;
private byte[] nonce = new byte[8];
private byte[] message;
@Override
public byte[] toBytes() {
if ((this.from == null) || (this.to == null) || (this.nonce == null) ||(this.message == null)){
return new byte[1];
}
byte[] result = new byte[this.from.length+this.to.length+this.nonce.length+this.message.length];
System.arraycopy(this.from, 0, result, 0, this.from.length);
System.arraycopy(this.to, 0, result, this.from.length, this.to.length);
System.arraycopy(this.nonce, 0, result, this.from.length+this.to.length, this.nonce.length);
System.arraycopy(this.message, 0, result, this.from.length+this.to.length+this.nonce.length, this.message.length);
return result;
}
public Memo(){
this.from = null;
this.nonce = null;
this.to = null;
this.message = null;
}
public Memo(byte[] private_key, byte[] public_key, byte[] msg){
this(private_key,public_key,msg,0);
}
public Memo(byte[] private_key, byte[] public_key, byte[] msg, long custom_nonce){
try {
MessageDigest md = MessageDigest.getInstance("SHA-256");
ECKey privateECKey = ECKey.fromPrivate(md.digest(private_key));
this.from = privateECKey.getPubKey();
this.to = public_key;
if (custom_nonce == 0){
SecureRandomStrengthener randomStrengthener = SecureRandomStrengthener.getInstance();
//randomStrengthener.addEntropySource(new AndroidRandomSource());
SecureRandom secureRandom = randomStrengthener.generateAndSeedRandomNumberGenerator();
secureRandom.nextBytes(nonce);
long time = System.currentTimeMillis();
for (int i = 7;i >=1; i--){
this.nonce[i] = (byte)(time&0xff);
time = time/0x100;
}
} else {
for (int i = 7;i >=0; i--){
this.nonce[i] = (byte)(custom_nonce&0xff);
custom_nonce = custom_nonce/0x100;
}
}
byte[] secret = privateECKey.getPubKeyPoint().multiply(ECKey.fromPublicOnly(md.digest(public_key)).getPrivKey()).normalize().getXCoord().getEncoded();
byte[] finalKey = new byte[secret.length + this.nonce.length];
byte[] sha256Msg = md.digest(msg);
byte[] serialChecksum = new byte[4];
System.arraycopy(sha256Msg, 0, serialChecksum, 0, 4);
byte[] msgFinal = new byte[serialChecksum.length + msg.length];
System.arraycopy(serialChecksum, 0, msgFinal, 0, serialChecksum.length);
System.arraycopy(msg, 0, msgFinal, serialChecksum.length, msg.length);
this.message = Util.encryptAES(msgFinal, finalKey);
} catch (NoSuchAlgorithmException ex){
}
}
}

105
src/main/java/com/luminiasoft/bitshares/Util.java
View file

@ -7,14 +7,23 @@ import org.tukaani.xz.LZMAInputStream;
import org.tukaani.xz.LZMAOutputStream;
import org.tukaani.xz.XZInputStream;
import org.tukaani.xz.XZOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.spongycastle.crypto.DataLengthException;
import org.spongycastle.crypto.InvalidCipherTextException;
import org.spongycastle.crypto.engines.AESFastEngine;
import org.spongycastle.crypto.modes.CBCBlockCipher;
import org.spongycastle.crypto.paddings.PaddedBufferedBlockCipher;
import org.spongycastle.crypto.params.KeyParameter;
import org.spongycastle.crypto.params.ParametersWithIV;
/**
* Class used to encapsulate common utility methods
@ -145,4 +154,98 @@ public class Util {
public static byte[] revertLong(Long input) {
return ByteBuffer.allocate(Long.SIZE / 8).putLong(Long.reverseBytes(input)).array();
}
/**
* Function to encrypt a message with AES
* @param input data to encrypt
* @param key key for encryption
* @return AES Encription of input
*/
public static byte[] encryptAES(byte[] input, byte[] key) {
try {
MessageDigest md = MessageDigest.getInstance("SHA-512");
byte[] result = md.digest(key);
byte[] ivBytes = new byte[16];
System.arraycopy(result, 32, ivBytes, 0, 16);
byte[] sksBytes = new byte[32];
System.arraycopy(result, 0, sksBytes, 0, 32);
PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESFastEngine()));
cipher.init(true, new ParametersWithIV(new KeyParameter(sksBytes), ivBytes));
byte[] temp = new byte[input.length + (16 - (input.length % 16))];
System.arraycopy(input, 0, temp, 0, input.length);
Arrays.fill(temp, input.length, temp.length, (byte) (16 - (input.length % 16)));
byte[] out = new byte[cipher.getOutputSize(temp.length)];
int proc = cipher.processBytes(temp, 0, temp.length, out, 0);
cipher.doFinal(out, proc);
temp = new byte[out.length - 16];
System.arraycopy(out, 0, temp, 0, temp.length);
return temp;
} catch (NoSuchAlgorithmException | DataLengthException | IllegalStateException | InvalidCipherTextException ex) {
}
return null;
}
/**
* Function to decrypt a message with AES encryption
* @param input data to decrypt
* @param key key for decryption
* @return input decrypted with AES. Null if the decrypt failed (Bad Key)
*/
public static byte[] decryptAES(byte[] input, byte[] key) {
try {
MessageDigest md = MessageDigest.getInstance("SHA-512");
byte[] result = md.digest(key);
byte[] ivBytes = new byte[16];
System.arraycopy(result, 32, ivBytes, 0, 16);
byte[] sksBytes = new byte[32];
System.arraycopy(result, 0, sksBytes, 0, 32);
PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESFastEngine()));
cipher.init(false, new ParametersWithIV(new KeyParameter(sksBytes), ivBytes));
byte[] pre_out = new byte[cipher.getOutputSize(input.length)];
int proc = cipher.processBytes(input, 0, input.length, pre_out, 0);
int proc2 = cipher.doFinal(pre_out, proc);
byte[] out = new byte[proc+proc2];
System.arraycopy(pre_out, 0, out, 0, proc+proc2);
//Unpadding
byte countByte = (byte)((byte)out[out.length-1] % 16);
int count = countByte & 0xFF;
if ((count > 15) || (count <= 0)){
return out;
}
byte[] temp = new byte[count];
System.arraycopy(out, out.length - count, temp, 0, temp.length);
byte[] temp2 = new byte[count];
Arrays.fill(temp2, (byte) count);
if (Arrays.equals(temp, temp2)) {
temp = new byte[out.length - count];
System.arraycopy(out, 0, temp, 0, out.length - count);
return temp;
} else {
return out;
}
} catch (NoSuchAlgorithmException | DataLengthException | IllegalStateException | InvalidCipherTextException ex) {
ex.printStackTrace();
}
return null;
}
/**
* Transform an array of bytes to an hex String representation
* @param input array of bytes to transform as a string
* @return Input as a String
*/
public static String byteToString(byte[] input) {
StringBuilder result = new StringBuilder();
for (byte in : input) {
if ((in & 0xff) < 0x10) {
result.append("0");
}
result.append(Integer.toHexString(in & 0xff));
}
return result.toString();
}
}