/* SBox8: 8 bit Pseudo-Random Number Generator Algorithm/Source Code */
/*
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relinquishment in perpetuity of all present and future rights to this
software under copyright law.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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For more information, please refer to
#** SBox8 algorithm originally designed and developed by Karl-Uwe Frank
*/
/*
------------------------------------------------------------------
SBox8 Test vectors
------------------------------------------------------------------
Seed (Hex): 00000000
Key (Hex): 000000000000000000
Keystream : 89 28 7b 77 5e 3e 2f f9 ab
Plaintext : Plaintext
Ciphertext: d9 44 1a 1e 30 4a 4a 81 df
--------------------------------------------------------------------
Seed (Hex): 00000000
Key (Hex): 000000000000000001
Keystream : 8e e7 b4 36 a8 4e ee a6 89 08 9a 54 49 7d 18 6b 0d
Plaintext : Secure my Secrets
Ciphertext: dd 82 d7 43 da 2b ce cb f0 28 c9 31 2a 0f 7d 1f 7e
--------------------------------------------------------------------
Seed (Hex): 01020304
Key (Hex): d69a6454d069458e0a
Keystream : 74 97 98 e3 f6 9f cf a4 f5 11 d1 00 58 80
Plaintext : Attack at dawn
Ciphertext: 35 e3 ec 82 95 f4 ef c5 81 31 b5 61 2f ee
-------------------------------------------------------------------
Seed (Hex): 01020304
Key (Hex): d69a6454d069458e0b
Keystream : bc 8a 7e 81 18 57 58 8c 7d 1d c9 f1 81 56 1c
Plaintext : Victory is near
Ciphertext: ea e3 1d f5 77 25 21 ac 14 6e e9 9f e4 37 6e
-------------------------------------------------------------------
Example:
echo -en "Secure my Secrets" | java SBox8_stdio 2ddd6a2c 0c8c8279b04c4430d69a6454d069458e > ciphertext.out
java SBox8_stdio 2ddd6a2c 0c8c8279b04c4430d69a6454d069458e < ciphertext.out
-------------------------------------------------------------------
*/
// Do not swap! Manage your JVM memory consumption with -ms and -mx keys.
import java.io.IOException;
import java.util.Arrays;
//-----------------------------------------
//
// Compile Instruction
//
// rm -f SBox8_stdio.class && javac SBox8_stdio.java
//
public class SBox8_stdio
{
//-----------------------------------------
//
// Global Varaiable Definition
//
private static byte[] KeyHash;
// Secret State Array
//
private static int SBox[] = new int[256];
// Global Carry on Array Indices
//
private static int a = 0;
private static int b = 0;
private static int c = 0;
private static int d = 0;
private static int j = 0;
//-----------------------------------------
// Main
//
public static void main (String args[]) throws IOException
{
try
{
if (args.length < 2) {
ShowUsage("SBox8_stdio");
System.exit(0);
}
//-----------------------------------------
// seed for the permutation initialisation
//
int seed = Integer.parseInt(args[0], 16);
//-----------------------------------------
// Rebuild KeyWord[] from KeyHash
//
KeyHash = hexStr2byteArr(args[1]);
//-----------------------------------------
// Initialisation of SBox8
//
SBox8_PIA(seed);
// Shuffle the key into the SBox8 Permutation
SBox8_KSA(KeyHash);
//-----------------------------------------
//
// Encrypt/Decrypt Binary File (unbuffered Read/Write)
//
byte[] inByte = new byte[1];
byte[] outByte = new byte[1];
int inB, outB;
while ((System.in.read(inByte) != -1)) {
inB = (int)inByte[0];
outB = (inB ^ SBox8_PRGA()) & 0xff;
outByte[0] = (byte)outB;
System.out.write(outByte[0]);
}
System.in.close();
System.out.close();
System.exit(0);
} catch (Exception e) {
System.err.println("Error: " + e);
} finally {
System.exit(0);
}
}
//-----------------------------------------
//
public static void ShowUsage(String ThisName)
{
System.err.printf("\nUsage : java %s Seed (in Hex) Key(in Hex) out\n", ThisName);
System.err.printf("\nExample: java %s 8e68cf3 7d0ef66789aca2cfa6c76db7560554 CipherFile\n", ThisName);
System.err.printf("\n cat CipherFile | java %s 8e68cf3 7d0ef66789aca2cfa6c76db7560554 > Plainfile\n\n", ThisName);
}
//-----------------------------------------
// Convert String in Hex Notation to byte Array
//
private static byte[] hexStr2byteArr(String hexStr)
{
int ArrLen = hexStr.length()/2;
byte[] byteArr = new byte[ArrLen];
for (int i=0; i> 8) & 0xff);
c = ((seed >> 16) & 0xff);
d = ((seed >> 24) & 0xff);
}
// Shifting to the next odd Value of each Variable
// in Order to generate an alternating Permutation
int t = ((b ^ c) + d);
t |= 1;
// Initialise the alternating Permutation
for (int i=0; i<256; i++) {
a += t & 0xff;
SBox[i] = a;
}
}
//-----------------------------------------
// KSA = Key Schedule Algorithm
//
public static void SBox8_KSA(byte[] key)
{
// Shuffle the key into the Permutation
for (int i=0; i<256; i++) {
d = i % key.length;
a = (a + SBox[b]) &0xff;
b = (b + SBox[a]) &0xff;
c = (a + b + i + key[d]) &0xff;
swap(SBox, c, i);
}
j=0;
}
//-----------------------------------------
// PRGA = Pseudo-Random Generation Algorithm
//
public static int SBox8_PRGA()
{
a = (a + SBox[b]) &0xff;
b = (b + SBox[a]) &0xff;
c = (a + b + j + SBox[j]) &0xff;
swap(SBox, c, j);
d = SBox[(SBox[c] + SBox[d]) &0xff] &0xff;
j = (j + 1) &0xff;
return ((a + b) ^ (c + d)) &0xff;
}
}