io.takamaka.crypto.tkmsecurityprovider.util.Pack Maven / Gradle / Ivy

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This package contains an old version of the qtesla algorithm from the bouncycastle library. Changes have been introduced in the current library that make the old keys incompatible with the new ones. The purpose of this package is to maintain, within the takamaka.io software, compatibility with the old implementation of signature keys.
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/*
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 */
package io.takamaka.crypto.tkmsecurityprovider.util;

/**
 * Utility methods for converting byte arrays into ints and longs, and back again.
 */
public abstract class Pack
{
    public static short bigEndianToShort(byte[] bs, int off)
    {
        int n = (bs[  off] & 0xff) << 8;
        n |= (bs[++off] & 0xff);
        return (short)n;
    }

    public static int bigEndianToInt(byte[] bs, int off)
    {
        int n = bs[  off] << 24;
        n |= (bs[++off] & 0xff) << 16;
        n |= (bs[++off] & 0xff) << 8;
        n |= (bs[++off] & 0xff);
        return n;
    }

    public static void bigEndianToInt(byte[] bs, int off, int[] ns)
    {
        for (int i = 0; i < ns.length; ++i)
        {
            ns[i] = bigEndianToInt(bs, off);
            off += 4;
        }
    }

    public static byte[] intToBigEndian(int n)
    {
        byte[] bs = new byte[4];
        intToBigEndian(n, bs, 0);
        return bs;
    }

    public static void intToBigEndian(int n, byte[] bs, int off)
    {
        bs[  off] = (byte)(n >>> 24);
        bs[++off] = (byte)(n >>> 16);
        bs[++off] = (byte)(n >>>  8);
        bs[++off] = (byte)(n       );
    }

    public static byte[] intToBigEndian(int[] ns)
    {
        byte[] bs = new byte[4 * ns.length];
        intToBigEndian(ns, bs, 0);
        return bs;
    }

    public static void intToBigEndian(int[] ns, byte[] bs, int off)
    {
        for (int i = 0; i < ns.length; ++i)
        {
            intToBigEndian(ns[i], bs, off);
            off += 4;
        }
    }

    public static long bigEndianToLong(byte[] bs, int off)
    {
        int hi = bigEndianToInt(bs, off);
        int lo = bigEndianToInt(bs, off + 4);
        return ((long)(hi & 0xffffffffL) << 32) | (long)(lo & 0xffffffffL);
    }

    public static void bigEndianToLong(byte[] bs, int off, long[] ns)
    {
        for (int i = 0; i < ns.length; ++i)
        {
            ns[i] = bigEndianToLong(bs, off);
            off += 8;
        }
    }

    public static byte[] longToBigEndian(long n)
    {
        byte[] bs = new byte[8];
        longToBigEndian(n, bs, 0);
        return bs;
    }

    public static void longToBigEndian(long n, byte[] bs, int off)
    {
        intToBigEndian((int)(n >>> 32), bs, off);
        intToBigEndian((int)(n & 0xffffffffL), bs, off + 4);
    }

    public static byte[] longToBigEndian(long[] ns)
    {
        byte[] bs = new byte[8 * ns.length];
        longToBigEndian(ns, bs, 0);
        return bs;
    }

    public static void longToBigEndian(long[] ns, byte[] bs, int off)
    {
        for (int i = 0; i < ns.length; ++i)
        {
            longToBigEndian(ns[i], bs, off);
            off += 8;
        }
    }

    public static short littleEndianToShort(byte[] bs, int off)
    {
        int n = bs[  off] & 0xff;
        n |= (bs[++off] & 0xff) << 8;
        return (short)n;
    }

    public static int littleEndianToInt(byte[] bs, int off)
    {
        int n = bs[  off] & 0xff;
        n |= (bs[++off] & 0xff) << 8;
        n |= (bs[++off] & 0xff) << 16;
        n |= bs[++off] << 24;
        return n;
    }

    public static void littleEndianToInt(byte[] bs, int off, int[] ns)
    {
        for (int i = 0; i < ns.length; ++i)
        {
            ns[i] = littleEndianToInt(bs, off);
            off += 4;
        }
    }

    public static void littleEndianToInt(byte[] bs, int bOff, int[] ns, int nOff, int count)
    {
        for (int i = 0; i < count; ++i)
        {
            ns[nOff + i] = littleEndianToInt(bs, bOff);
            bOff += 4;
        }
    }

    public static int[] littleEndianToInt(byte[] bs, int off, int count)
    {
        int[] ns = new int[count];
        for (int i = 0; i < ns.length; ++i)
        {
            ns[i] = littleEndianToInt(bs, off);
            off += 4;
        }
        return ns;
    }

    public static byte[] shortToLittleEndian(short n)
    {
        byte[] bs = new byte[2];
        shortToLittleEndian(n, bs, 0);
        return bs;
    }

    public static void shortToLittleEndian(short n, byte[] bs, int off)
    {
        bs[  off] = (byte)(n       );
        bs[++off] = (byte)(n >>>  8);
    }

    public static byte[] intToLittleEndian(int n)
    {
        byte[] bs = new byte[4];
        intToLittleEndian(n, bs, 0);
        return bs;
    }

    public static void intToLittleEndian(int n, byte[] bs, int off)
    {
        bs[  off] = (byte)(n       );
        bs[++off] = (byte)(n >>>  8);
        bs[++off] = (byte)(n >>> 16);
        bs[++off] = (byte)(n >>> 24);
    }

    public static byte[] intToLittleEndian(int[] ns)
    {
        byte[] bs = new byte[4 * ns.length];
        intToLittleEndian(ns, bs, 0);
        return bs;
    }

    public static void intToLittleEndian(int[] ns, byte[] bs, int off)
    {
        for (int i = 0; i < ns.length; ++i)
        {
            intToLittleEndian(ns[i], bs, off);
            off += 4;
        }
    }

    public static long littleEndianToLong(byte[] bs, int off)
    {
        int lo = littleEndianToInt(bs, off);
        int hi = littleEndianToInt(bs, off + 4);
        return ((long)(hi & 0xffffffffL) << 32) | (long)(lo & 0xffffffffL);
    }

    public static void littleEndianToLong(byte[] bs, int off, long[] ns)
    {
        for (int i = 0; i < ns.length; ++i)
        {
            ns[i] = littleEndianToLong(bs, off);
            off += 8;
        }
    }

    public static void littleEndianToLong(byte[] bs, int bsOff, long[] ns, int nsOff, int nsLen)
    {
        for (int i = 0; i < nsLen; ++i)
        {
            ns[nsOff + i] = littleEndianToLong(bs, bsOff);
            bsOff += 8;
        }
    }

    public static byte[] longToLittleEndian(long n)
    {
        byte[] bs = new byte[8];
        longToLittleEndian(n, bs, 0);
        return bs;
    }

    public static void longToLittleEndian(long n, byte[] bs, int off)
    {
        intToLittleEndian((int)(n & 0xffffffffL), bs, off);
        intToLittleEndian((int)(n >>> 32), bs, off + 4);
    }

    public static byte[] longToLittleEndian(long[] ns)
    {
        byte[] bs = new byte[8 * ns.length];
        longToLittleEndian(ns, bs, 0);
        return bs;
    }

    public static void longToLittleEndian(long[] ns, byte[] bs, int off)
    {
        for (int i = 0; i < ns.length; ++i)
        {
            longToLittleEndian(ns[i], bs, off);
            off += 8;
        }
    }

    public static void longToLittleEndian(long[] ns, int nsOff, int nsLen, byte[] bs, int bsOff)
    {
        for (int i = 0; i < nsLen; ++i)
        {
            longToLittleEndian(ns[nsOff + i], bs, bsOff);
            bsOff += 8;
        }
    }
}