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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.4.
package org.bouncycastle.pqc.crypto.qtesla;
class CommonFunction
{
/****************************************************************************************************
* Description: Checks Whether the Two Parts of Arrays are Equal to Each Other
*
* @param left Left Array
* @param leftOffset Starting Point of the Left Array
* @param right Right Array
* @param rightOffset Starting Point of the Right Array
* @param length Length to be Compared from the Starting Point
*
* @return true Equal
* false Different
****************************************************************************************************/
public static boolean memoryEqual(byte[] left, int leftOffset, byte[] right, int rightOffset, int length)
{
if ((leftOffset + length <= left.length) && (rightOffset + length <= right.length))
{
for (int i = 0; i < length; i++)
{
if (left[leftOffset + i] != right[rightOffset + i])
{
return false;
}
}
return true;
}
else
{
return false;
}
}
/****************************************************************************
* Description: Converts 2 Consecutive Bytes in "load" to A Number of "Short"
* from A Known Position
*
* @param load Source Array
* @param loadOffset Starting Position
*
* @return A Number of "Short"
****************************************************************************/
public static short load16(final byte[] load, int loadOffset)
{
short number = 0;
if (load.length - loadOffset >= Const.SHORT_SIZE / Const.BYTE_SIZE)
{
for (int i = 0; i < Const.SHORT_SIZE / Const.BYTE_SIZE; i++)
{
number ^= (short)(load[loadOffset + i] & 0xFF) << (Const.BYTE_SIZE * i);
}
}
else
{
for (int i = 0; i < load.length - loadOffset; i++)
{
number ^= (short)(load[loadOffset + i] & 0xFF) << (Const.BYTE_SIZE * i);
}
}
return number;
}
/******************************************************************************
* Description: Converts 4 Consecutive Bytes in "load" to A Number of "Integer"
* from A Known Position
*
* @param load Source Array
* @param loadOffset Starting Position
*
* @return A Number of "Integer"
******************************************************************************/
public static int load32(final byte[] load, int loadOffset)
{
int number = 0;
if (load.length - loadOffset >= Const.INT_SIZE / Const.BYTE_SIZE)
{
for (int i = 0; i < Const.INT_SIZE / Const.BYTE_SIZE; i++)
{
number ^= (int)(load[loadOffset + i] & 0xFF) << (Const.BYTE_SIZE * i);
}
}
else
{
for (int i = 0; i < load.length - loadOffset; i++)
{
number ^= (int)(load[loadOffset + i] & 0xFF) << (Const.BYTE_SIZE * i);
}
}
return number;
}
/***************************************************************************
* Description: Converts 8 Consecutive Bytes in "load" to A Number of "Long"
* from A Known Position
*
* @param load Source Array
* @param loadOffset Starting Position
*
* @return A Number of "Long"
***************************************************************************/
public static long load64(final byte[] load, int loadOffset)
{
long number = 0L;
if (load.length - loadOffset >= Const.LONG_SIZE / Const.BYTE_SIZE)
{
for (int i = 0; i < Const.LONG_SIZE / Const.BYTE_SIZE; i++)
{
number ^= (long)(load[loadOffset + i] & 0xFF) << (Const.BYTE_SIZE * i);
}
}
else
{
for (int i = 0; i < load.length - loadOffset; i++)
{
number ^= (long)(load[loadOffset + i] & 0xFF) << (Const.BYTE_SIZE * i);
}
}
return number;
}
/*****************************************************************************
* Description: Converts A Number of "Short" to 2 Consecutive Bytes in "store"
* from a known position
*
* @param store Destination Array
* @param storeOffset Starting position
* @param number Source Number
*
* @return none
*****************************************************************************/
public static void store16(byte[] store, int storeOffset, short number)
{
if (store.length - storeOffset >= Const.SHORT_SIZE / Const.BYTE_SIZE)
{
for (int i = 0; i < Const.SHORT_SIZE / Const.BYTE_SIZE; i++)
{
store[storeOffset + i] = (byte)((number >> (Const.BYTE_SIZE * i)) & 0xFF);
}
}
else
{
for (int i = 0; i < store.length - storeOffset; i++)
{
store[storeOffset + i] = (byte)((number >> (Const.BYTE_SIZE * i)) & 0xFF);
}
}
}
/*******************************************************************************
* Description: Converts A Number of "Integer" to 4 Consecutive Bytes in "store"
* from A Known Position
*
* @param store Destination Array
* @param storeOffset Starting Position
* @param number: Source Number
*
* @return none
*******************************************************************************/
public static void store32(byte[] store, int storeOffset, int number)
{
if (store.length - storeOffset >= Const.INT_SIZE / Const.BYTE_SIZE)
{
for (int i = 0; i < Const.INT_SIZE / Const.BYTE_SIZE; i++)
{
store[storeOffset + i] = (byte)((number >> (Const.BYTE_SIZE * i)) & 0xFF);
}
}
else
{
for (int i = 0; i < store.length - storeOffset; i++)
{
store[storeOffset + i] = (byte)((number >> (Const.BYTE_SIZE * i)) & 0xFF);
}
}
}
/****************************************************************************
* Description: Converts A Number of "Long" to 8 Consecutive Bytes in "store"
* from A Known Position
*
* @param store Destination Array
* @param storeOffset Starting Position
* @param number Source Number
*
* @return none
****************************************************************************/
public static void store64(byte[] store, int storeOffset, long number)
{
if (store.length - storeOffset >= Const.LONG_SIZE / Const.BYTE_SIZE)
{
for (int i = 0; i < Const.LONG_SIZE / Const.BYTE_SIZE; i++)
{
store[storeOffset + i] = (byte)((number >> (Const.BYTE_SIZE * i)) & 0xFFL);
}
}
else
{
for (int i = 0; i < store.length - storeOffset; i++)
{
store[storeOffset + i] = (byte)((number >> (Const.BYTE_SIZE * i)) & 0xFFL);
}
}
}
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