org.telegram.mtproto.secure.CryptoUtils Maven / Gradle / Ivy
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Java library to create Telegram Clients
package org.telegram.mtproto.secure;
import org.telegram.mtproto.secure.aes.AESImplementation;
import org.telegram.mtproto.secure.aes.DefaultAESImplementation;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.PublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.RSAPublicKeySpec;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
/**
* Author: Korshakov Stepan
* Created: 18.07.13 3:54
*/
public class CryptoUtils {
private static final ThreadLocal md5 = new ThreadLocal() {
@Override
protected MessageDigest initialValue() {
MessageDigest crypt = null;
try {
crypt = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return crypt;
}
};
private static final ThreadLocal sha1 = new ThreadLocal() {
@Override
protected MessageDigest initialValue() {
MessageDigest crypt = null;
try {
crypt = MessageDigest.getInstance("SHA-1");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return crypt;
}
};
private static AESImplementation currentImplementation = new DefaultAESImplementation();
public static void setAESImplementation(AESImplementation implementation) {
currentImplementation = implementation;
}
public static byte[] RSA(byte[] src, BigInteger key, BigInteger exponent) {
try {
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PublicKey publicKey = keyFactory.generatePublic(new RSAPublicKeySpec(key, exponent));
Cipher cipher = Cipher.getInstance("RSA/ECB/NoPadding");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
return cipher.doFinal(src);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (InvalidKeySpecException e) {
e.printStackTrace();
}
return null;
}
public static void AES256IGEDecryptBig(byte[] src, byte[] dest, int len, byte[] iv, byte[] key) {
currentImplementation.AES256IGEDecrypt(src, dest, len, iv, key);
}
public static byte[] AES256IGEDecrypt(byte[] src, byte[] iv, byte[] key) {
byte[] res = new byte[src.length];
currentImplementation.AES256IGEDecrypt(src, res, src.length, iv, key);
return res;
}
public static void AES256IGEDecrypt(File src, File dest, byte[] iv, byte[] key) throws IOException {
currentImplementation.AES256IGEDecrypt(src.getAbsolutePath(), dest.getAbsolutePath(), iv, key);
}
public static void AES256IGEEncrypt(File src, File dest, byte[] iv, byte[] key) throws IOException {
currentImplementation.AES256IGEEncrypt(src.getAbsolutePath(), dest.getAbsolutePath(), iv, key);
}
public static byte[] AES256IGEEncrypt(byte[] src, byte[] iv, byte[] key) {
byte[] res = new byte[src.length];
currentImplementation.AES256IGEEncrypt(src, res, src.length, iv, key);
return res;
}
public static String MD5(byte[] src) {
try {
MessageDigest crypt = MessageDigest.getInstance("MD5");
crypt.reset();
crypt.update(src);
return ToHex(crypt.digest());
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return null;
}
public static String MD5(RandomAccessFile randomAccessFile) {
try {
MessageDigest crypt = md5.get();
crypt.reset();
byte[] block = new byte[8 * 1024];
for (int i = 0; i < randomAccessFile.length(); i += 8 * 1024) {
int len = (int) Math.min(block.length, randomAccessFile.length() - i);
randomAccessFile.readFully(block, 0, len);
crypt.update(block, 0, len);
}
return ToHex(crypt.digest());
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
public static String MD5(File file) {
try {
RandomAccessFile randomAccessFile = new RandomAccessFile(file, "r");
MessageDigest crypt = md5.get();
crypt.reset();
byte[] block = new byte[8 * 1024];
for (int i = 0; i < randomAccessFile.length(); i += 8 * 1024) {
int len = (int) Math.min(block.length, randomAccessFile.length() - i);
randomAccessFile.readFully(block, 0, len);
crypt.update(block, 0, len);
}
return ToHex(crypt.digest());
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
public static byte[] MD5Raw(byte[] src) {
MessageDigest crypt = md5.get();
crypt.reset();
crypt.update(src);
return crypt.digest();
}
public static String ToHex(byte[] src) {
String res = "";
for (int i = 0; i < src.length; i++) {
res += String.format("%02X", src[i] & 0xFF);
}
return res.toLowerCase();
}
public static byte[] SHA1(InputStream in) throws IOException {
MessageDigest crypt = sha1.get();
crypt.reset();
// Transfer bytes from in to out
byte[] buf = new byte[4 * 1024];
int len;
while ((len = in.read(buf)) > 0) {
Thread.yield();
// out.write(buf, 0, len);
crypt.update(buf, 0, len);
}
in.close();
return crypt.digest();
}
public static byte[] SHA1(String fileName) throws IOException {
MessageDigest crypt = sha1.get();
crypt.reset();
FileInputStream in = new FileInputStream(fileName);
// Transfer bytes from in to out
byte[] buf = new byte[4 * 1024];
int len;
while ((len = in.read(buf)) > 0) {
Thread.yield();
// out.write(buf, 0, len);
crypt.update(buf, 0, len);
}
in.close();
return crypt.digest();
}
public static byte[] SHA1(byte[] src) {
MessageDigest crypt = sha1.get();
crypt.reset();
crypt.update(src);
return crypt.digest();
}
public static byte[] SHA1(byte[]... src1) {
MessageDigest crypt = sha1.get();
crypt.reset();
for (int i = 0; i < src1.length; i++) {
crypt.update(src1[i]);
}
return crypt.digest();
}
public static boolean arrayEq(byte[] a, byte[] b) {
if (a.length != b.length) {
return false;
}
for (int i = 0; i < a.length; i++) {
if (a[i] != b[i])
return false;
}
return true;
}
public static byte[] concat(byte[]... v) {
int len = 0;
for (int i = 0; i < v.length; i++) {
len += v[i].length;
}
byte[] res = new byte[len];
int offset = 0;
for (int i = 0; i < v.length; i++) {
System.arraycopy(v[i], 0, res, offset, v[i].length);
offset += v[i].length;
}
return res;
}
public static byte[] substring(byte[] src, int start, int len) {
byte[] res = new byte[len];
System.arraycopy(src, start, res, 0, len);
return res;
}
public static byte[] align(byte[] src, int factor) {
if (src.length % factor == 0) {
return src;
}
int padding = factor - src.length % factor;
return concat(src, Entropy.getInstance().generateSeed(padding));
}
public static byte[] alignKeyZero(byte[] src, int size) {
if (src.length == size) {
return src;
}
if (src.length > size) {
return substring(src, src.length - size, size);
} else {
return concat(new byte[size - src.length], src);
}
}
public static byte[] xor(byte[] a, byte[] b) {
byte[] res = new byte[a.length];
for (int i = 0; i < a.length; i++) {
res[i] = (byte) (a[i] ^ b[i]);
}
return res;
}
public static BigInteger loadBigInt(byte[] data) {
return new BigInteger(1, data);
}
public static byte[] fromBigInt(BigInteger val) {
byte[] res = val.toByteArray();
if (res[0] == 0) {
byte[] res2 = new byte[res.length - 1];
System.arraycopy(res, 1, res2, 0, res2.length);
return res2;
} else {
return res;
}
}
public static boolean isZero(byte[] src) {
for (int i = 0; i < src.length; i++) {
if (src[i] != 0) {
return false;
}
}
return true;
}
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