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maxgalbu/Readme.md

Created July 28, 2017 09:40
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Readme.md

To use it, run these commands:

javac SimpleStringEncrypter.java
java SimpleStringEncrypter
Raw
SimpleStringEncrypter.java
import java.io.*;
import java.util.Arrays;
public class SimpleStringEncrypter {
private static final byte[] PASSWORD_ENCRYPTION_KEY = "sdf@!#$verf^wv%6Fwe%$$#FFGwfsdefwfe135s$^H)dg".getBytes();
private static final String CHARSET = "UTF8";
public static void main(String[] args) throws Exception{
SimpleStringEncrypter simpleStringEncrypter = new SimpleStringEncrypter();
System.out.println(simpleStringEncrypter.encrypt("Hello"));
//Replace this string with whatever you find it in .dbeaver-data-sources.xml
System.out.println(simpleStringEncrypter.decrypt("OwEKLE4jpQ=="));
}
public SimpleStringEncrypter() {
}
public String encrypt(String unencryptedString) throws Exception {
if(unencryptedString == null) {
throw new IllegalArgumentException("Empty string");
} else {
try {
byte[] e = unencryptedString.getBytes("UTF8");
byte[] plainBytes = Arrays.copyOf(e, e.length + 2);
plainBytes[plainBytes.length - 2] = 0;
plainBytes[plainBytes.length - 1] = -127;
this.xorStringByKey(plainBytes);
return Base64.encode(plainBytes);
} catch (Exception var4) {
throw new Exception(var4);
}
}
}
private void xorStringByKey(byte[] plainBytes) throws UnsupportedEncodingException {
int keyOffset = 0;
for(int i = 0; i < plainBytes.length; ++i) {
byte keyChar = PASSWORD_ENCRYPTION_KEY[keyOffset];
++keyOffset;
if(keyOffset >= PASSWORD_ENCRYPTION_KEY.length) {
keyOffset = 0;
}
plainBytes[i] ^= keyChar;
}
}
public String decrypt(String encryptedString) throws Exception {
if(encryptedString != null && encryptedString.trim().length() > 0) {
try {
byte[] e = Base64.decode(encryptedString);
this.xorStringByKey(e);
if(e[e.length - 2] == 0 && e[e.length - 1] == -127) {
return new String(e, 0, e.length - 2, "UTF8");
} else {
throw new Exception("Invalid encrypted string");
}
} catch (Exception var3) {
throw new Exception(var3);
}
} else {
throw new IllegalArgumentException("Empty encrypted string");
}
}
}
final class Base64 {
private static final char[] S_BASE64CHAR = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x',
'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', '+', '/'
};
private static final char S_BASE64PAD = '=';
private static final byte[] S_DECODETABLE = new byte[128];
static {
for (int i = 0; i < S_DECODETABLE.length; i ++)
S_DECODETABLE[i] = Byte.MAX_VALUE; // 127
for (int i = 0; i < S_BASE64CHAR.length; i ++) // 0 to 63
S_DECODETABLE[S_BASE64CHAR[i]] = (byte)i;
}
private static int decode0(char[] ibuf, byte[] obuf, int wp) {
int outlen = 3;
if (ibuf[3] == S_BASE64PAD) outlen = 2;
if (ibuf[2] == S_BASE64PAD) outlen = 1;
int b0 = S_DECODETABLE[ibuf[0]];
int b1 = S_DECODETABLE[ibuf[1]];
int b2 = S_DECODETABLE[ibuf[2]];
int b3 = S_DECODETABLE[ibuf[3]];
switch (outlen) {
case 1:
obuf[wp] = (byte)(b0 << 2 & 0xfc | b1 >> 4 & 0x3);
return 1;
case 2:
obuf[wp++] = (byte)(b0 << 2 & 0xfc | b1 >> 4 & 0x3);
obuf[wp] = (byte)(b1 << 4 & 0xf0 | b2 >> 2 & 0xf);
return 2;
case 3:
obuf[wp++] = (byte)(b0 << 2 & 0xfc | b1 >> 4 & 0x3);
obuf[wp++] = (byte)(b1 << 4 & 0xf0 | b2 >> 2 & 0xf);
obuf[wp] = (byte)(b2 << 6 & 0xc0 | b3 & 0x3f);
return 3;
default:
throw new RuntimeException("Internal Errror");
}
}
/**
*
*/
public static byte[] decode(char[] data, int off, int len) {
char[] ibuf = new char[4];
int ibufcount = 0;
byte[] obuf = new byte[len/4*3+3];
int obufcount = 0;
for (int i = off; i < off+len; i ++) {
char ch = data[i];
if (ch == S_BASE64PAD
|| ch < S_DECODETABLE.length && S_DECODETABLE[ch] != Byte.MAX_VALUE) {
ibuf[ibufcount++] = ch;
if (ibufcount == ibuf.length) {
ibufcount = 0;
obufcount += decode0(ibuf, obuf, obufcount);
}
}
}
if (obufcount == obuf.length)
return obuf;
byte[] ret = new byte[obufcount];
System.arraycopy(obuf, 0, ret, 0, obufcount);
return ret;
}
/**
*
*/
public static byte[] decode(String data) {
char[] ibuf = new char[4];
int ibufcount = 0;
byte[] obuf = new byte[data.length()/4*3+3];
int obufcount = 0;
for (int i = 0; i < data.length(); i ++) {
char ch = data.charAt(i);
if (ch == S_BASE64PAD
|| ch < S_DECODETABLE.length && S_DECODETABLE[ch] != Byte.MAX_VALUE) {
ibuf[ibufcount++] = ch;
if (ibufcount == ibuf.length) {
ibufcount = 0;
obufcount += decode0(ibuf, obuf, obufcount);
}
}
}
if (obufcount == obuf.length)
return obuf;
byte[] ret = new byte[obufcount];
System.arraycopy(obuf, 0, ret, 0, obufcount);
return ret;
}
/**
*
*/
public static void decode(char[] data, int off, int len, OutputStream ostream) throws IOException {
char[] ibuf = new char[4];
int ibufcount = 0;
byte[] obuf = new byte[3];
for (int i = off; i < off+len; i ++) {
char ch = data[i];
if (ch == S_BASE64PAD
|| ch < S_DECODETABLE.length && S_DECODETABLE[ch] != Byte.MAX_VALUE) {
ibuf[ibufcount++] = ch;
if (ibufcount == ibuf.length) {
ibufcount = 0;
int obufcount = decode0(ibuf, obuf, 0);
ostream.write(obuf, 0, obufcount);
}
}
}
}
/**
*
*/
public static void decode(String data, OutputStream ostream) throws IOException {
char[] ibuf = new char[4];
int ibufcount = 0;
byte[] obuf = new byte[3];
for (int i = 0; i < data.length(); i ++) {
char ch = data.charAt(i);
if (ch == S_BASE64PAD
|| ch < S_DECODETABLE.length && S_DECODETABLE[ch] != Byte.MAX_VALUE) {
ibuf[ibufcount++] = ch;
if (ibufcount == ibuf.length) {
ibufcount = 0;
int obufcount = decode0(ibuf, obuf, 0);
ostream.write(obuf, 0, obufcount);
}
}
}
}
/**
* Returns base64 representation of specified byte array.
*/
public static String encode(byte[] data) {
return encode(data, 0, data.length);
}
/**
* Returns base64 representation of specified byte array.
*/
public static String encode(byte[] data, int off, int len)
{
if (len <= 0) return "";
char[] out = new char[len/3*4+4];
int rindex = off;
int windex = 0;
int rest = len-off;
while (rest >= 3) {
int i = ((data[rindex]&0xff)<<16)
+((data[rindex+1]&0xff)<<8)
+(data[rindex+2]&0xff);
out[windex++] = S_BASE64CHAR[i>>18];
out[windex++] = S_BASE64CHAR[(i>>12)&0x3f];
out[windex++] = S_BASE64CHAR[(i>>6)&0x3f];
out[windex++] = S_BASE64CHAR[i&0x3f];
rindex += 3;
rest -= 3;
}
if (rest == 1) {
int i = data[rindex]&0xff;
out[windex++] = S_BASE64CHAR[i>>2];
out[windex++] = S_BASE64CHAR[(i<<4)&0x3f];
out[windex++] = S_BASE64PAD;
out[windex++] = S_BASE64PAD;
} else if (rest == 2) {
int i = ((data[rindex]&0xff)<<8)+(data[rindex+1]&0xff);
out[windex++] = S_BASE64CHAR[i>>10];
out[windex++] = S_BASE64CHAR[(i>>4)&0x3f];
out[windex++] = S_BASE64CHAR[(i<<2)&0x3f];
out[windex++] = S_BASE64PAD;
}
return new String(out, 0, windex);
}
/**
* Outputs base64 representation of the specified byte array to a byte stream.
*/
public static void encode(byte[] data, int off, int len, OutputStream ostream) throws IOException {
if (len <= 0) return;
byte[] out = new byte[4];
int rindex = off;
int rest = len-off;
while (rest >= 3) {
int i = ((data[rindex]&0xff)<<16)
+((data[rindex+1]&0xff)<<8)
+(data[rindex+2]&0xff);
out[0] = (byte)S_BASE64CHAR[i>>18];
out[1] = (byte)S_BASE64CHAR[(i>>12)&0x3f];
out[2] = (byte)S_BASE64CHAR[(i>>6)&0x3f];
out[3] = (byte)S_BASE64CHAR[i&0x3f];
ostream.write(out, 0, 4);
rindex += 3;
rest -= 3;
}
if (rest == 1) {
int i = data[rindex]&0xff;
out[0] = (byte)S_BASE64CHAR[i>>2];
out[1] = (byte)S_BASE64CHAR[(i<<4)&0x3f];
out[2] = (byte)S_BASE64PAD;
out[3] = (byte)S_BASE64PAD;
ostream.write(out, 0, 4);
} else if (rest == 2) {
int i = ((data[rindex]&0xff)<<8)+(data[rindex+1]&0xff);
out[0] = (byte)S_BASE64CHAR[i>>10];
out[1] = (byte)S_BASE64CHAR[(i>>4)&0x3f];
out[2] = (byte)S_BASE64CHAR[(i<<2)&0x3f];
out[3] = (byte)S_BASE64PAD;
ostream.write(out, 0, 4);
}
}
/**
* Outputs base64 representation of the specified byte array to a character stream.
*/
public static void encode(byte[] data, int off, int len, Writer writer) throws IOException {
if (len <= 0) return;
char[] out = new char[4];
int rindex = off;
int rest = len-off;
while (rest >= 3) {
int i = ((data[rindex]&0xff)<<16)
+((data[rindex+1]&0xff)<<8)
+(data[rindex+2]&0xff);
out[0] = S_BASE64CHAR[i>>18];
out[1] = S_BASE64CHAR[(i>>12)&0x3f];
out[2] = S_BASE64CHAR[(i>>6)&0x3f];
out[3] = S_BASE64CHAR[i&0x3f];
writer.write(out, 0, 4);
rindex += 3;
rest -= 3;
/*
if (output % 76 == 0)
writer.write("\n");
*/
}
if (rest == 1) {
int i = data[rindex]&0xff;
out[0] = S_BASE64CHAR[i>>2];
out[1] = S_BASE64CHAR[(i<<4)&0x3f];
out[2] = S_BASE64PAD;
out[3] = S_BASE64PAD;
writer.write(out, 0, 4);
} else if (rest == 2) {
int i = ((data[rindex]&0xff)<<8)+(data[rindex+1]&0xff);
out[0] = S_BASE64CHAR[i>>10];
out[1] = S_BASE64CHAR[(i>>4)&0x3f];
out[2] = S_BASE64CHAR[(i<<2)&0x3f];
out[3] = S_BASE64PAD;
writer.write(out, 0, 4);
}
}
/**
* Outputs base64 representation of the specified input stream to a character stream.
*/
public static void encode(InputStream stream, long len, Writer writer)
throws IOException
{
if (len <= 0) return;
char[] out = new char[4];
long rest = len;
while (rest >= 3) {
int i = ((stream.read()&0xff)<<16)
+((stream.read()&0xff)<<8)
+(stream.read()&0xff);
out[0] = S_BASE64CHAR[i>>18];
out[1] = S_BASE64CHAR[(i>>12)&0x3f];
out[2] = S_BASE64CHAR[(i>>6)&0x3f];
out[3] = S_BASE64CHAR[i&0x3f];
writer.write(out, 0, 4);
rest -= 3;
}
if (rest == 1) {
int i = stream.read()&0xff;
out[0] = S_BASE64CHAR[i>>2];
out[1] = S_BASE64CHAR[(i<<4)&0x3f];
out[2] = S_BASE64PAD;
out[3] = S_BASE64PAD;
writer.write(out, 0, 4);
} else if (rest == 2) {
int i = ((stream.read()&0xff)<<8)+(stream.read()&0xff);
out[0] = S_BASE64CHAR[i>>10];
out[1] = S_BASE64CHAR[(i>>4)&0x3f];
out[2] = S_BASE64CHAR[(i<<2)&0x3f];
out[3] = S_BASE64PAD;
writer.write(out, 0, 4);
}
}
}
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