org.bouncycastle.math.ec.rfc8032.Codec Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of bcprov-ext-debug-jdk18on Show documentation

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 Java 1.8 and later with debug enabled.

The newest version!

package org.bouncycastle.math.ec.rfc8032;

abstract class Codec
{
    static int decode16(byte[] bs, int off)
    {
        int n = bs[off] & 0xFF;
        n |= (bs[++off] & 0xFF) << 8;
        return n;
    }

    static int decode24(byte[] bs, int off)
    {
        int n = bs[  off] & 0xFF;
        n |= (bs[++off] & 0xFF) << 8;
        n |= (bs[++off] & 0xFF) << 16;
        return n;
    }

    static int decode32(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;
    }

    static void decode32(byte[] bs, int bsOff, int[] n, int nOff, int nLen)
    {
        for (int i = 0; i < nLen; ++i)
        {
            n[nOff + i] = decode32(bs, bsOff + i * 4);
        }
    }

    static void encode24(int n, byte[] bs, int off)
    {
        bs[  off] = (byte)(n       );
        bs[++off] = (byte)(n >>>  8);
        bs[++off] = (byte)(n >>> 16);
    }

    static void encode32(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);
    }

    static void encode32(int[] n, int nOff, int nLen, byte[] bs, int bsOff)
    {
        for (int i = 0; i < nLen; ++i)
        {
            encode32(n[nOff + i], bs, bsOff + i * 4);
        }
    }

    static void encode56(long n, byte[] bs, int off)
    {
        encode32((int)n, bs, off);
        encode24((int)(n >>> 32), bs, off + 4);
    }
}