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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.crypto.prng;

import org.bouncycastle.util.Pack;

public class VMPCRandomGenerator implements RandomGenerator
{
    private byte n = 0;

    /**
     * Permutation generated by code: 
     * // First 1850 fractional digit of Pi number. 
     * byte[] key = new BigInteger("14159265358979323846...5068006422512520511").toByteArray();
     * s = 0;
     * P = new byte[256];
     * for (int i = 0; i < 256; i++) {
     *     P[i] = (byte) i;
     * }
     * for (int m = 0; m < 768; m++) {
     *     s = P[(s + P[m & 0xff] + key[m % key.length]) & 0xff];
     *     byte temp = P[m & 0xff];
     *     P[m & 0xff] = P[s & 0xff];
     *     P[s & 0xff] = temp;
     * } 
     */
    private byte[] P =
    {
        (byte) 0xbb, (byte) 0x2c, (byte) 0x62, (byte) 0x7f,
        (byte) 0xb5, (byte) 0xaa, (byte) 0xd4, (byte) 0x0d, (byte) 0x81,
        (byte) 0xfe, (byte) 0xb2, (byte) 0x82, (byte) 0xcb, (byte) 0xa0,
        (byte) 0xa1, (byte) 0x08, (byte) 0x18, (byte) 0x71, (byte) 0x56,
        (byte) 0xe8, (byte) 0x49, (byte) 0x02, (byte) 0x10, (byte) 0xc4,
        (byte) 0xde, (byte) 0x35, (byte) 0xa5, (byte) 0xec, (byte) 0x80,
        (byte) 0x12, (byte) 0xb8, (byte) 0x69, (byte) 0xda, (byte) 0x2f,
        (byte) 0x75, (byte) 0xcc, (byte) 0xa2, (byte) 0x09, (byte) 0x36,
        (byte) 0x03, (byte) 0x61, (byte) 0x2d, (byte) 0xfd, (byte) 0xe0,
        (byte) 0xdd, (byte) 0x05, (byte) 0x43, (byte) 0x90, (byte) 0xad,
        (byte) 0xc8, (byte) 0xe1, (byte) 0xaf, (byte) 0x57, (byte) 0x9b,
        (byte) 0x4c, (byte) 0xd8, (byte) 0x51, (byte) 0xae, (byte) 0x50,
        (byte) 0x85, (byte) 0x3c, (byte) 0x0a, (byte) 0xe4, (byte) 0xf3,
        (byte) 0x9c, (byte) 0x26, (byte) 0x23, (byte) 0x53, (byte) 0xc9,
        (byte) 0x83, (byte) 0x97, (byte) 0x46, (byte) 0xb1, (byte) 0x99,
        (byte) 0x64, (byte) 0x31, (byte) 0x77, (byte) 0xd5, (byte) 0x1d,
        (byte) 0xd6, (byte) 0x78, (byte) 0xbd, (byte) 0x5e, (byte) 0xb0,
        (byte) 0x8a, (byte) 0x22, (byte) 0x38, (byte) 0xf8, (byte) 0x68,
        (byte) 0x2b, (byte) 0x2a, (byte) 0xc5, (byte) 0xd3, (byte) 0xf7,
        (byte) 0xbc, (byte) 0x6f, (byte) 0xdf, (byte) 0x04, (byte) 0xe5,
        (byte) 0x95, (byte) 0x3e, (byte) 0x25, (byte) 0x86, (byte) 0xa6,
        (byte) 0x0b, (byte) 0x8f, (byte) 0xf1, (byte) 0x24, (byte) 0x0e,
        (byte) 0xd7, (byte) 0x40, (byte) 0xb3, (byte) 0xcf, (byte) 0x7e,
        (byte) 0x06, (byte) 0x15, (byte) 0x9a, (byte) 0x4d, (byte) 0x1c,
        (byte) 0xa3, (byte) 0xdb, (byte) 0x32, (byte) 0x92, (byte) 0x58,
        (byte) 0x11, (byte) 0x27, (byte) 0xf4, (byte) 0x59, (byte) 0xd0,
        (byte) 0x4e, (byte) 0x6a, (byte) 0x17, (byte) 0x5b, (byte) 0xac,
        (byte) 0xff, (byte) 0x07, (byte) 0xc0, (byte) 0x65, (byte) 0x79,
        (byte) 0xfc, (byte) 0xc7, (byte) 0xcd, (byte) 0x76, (byte) 0x42,
        (byte) 0x5d, (byte) 0xe7, (byte) 0x3a, (byte) 0x34, (byte) 0x7a,
        (byte) 0x30, (byte) 0x28, (byte) 0x0f, (byte) 0x73, (byte) 0x01,
        (byte) 0xf9, (byte) 0xd1, (byte) 0xd2, (byte) 0x19, (byte) 0xe9,
        (byte) 0x91, (byte) 0xb9, (byte) 0x5a, (byte) 0xed, (byte) 0x41,
        (byte) 0x6d, (byte) 0xb4, (byte) 0xc3, (byte) 0x9e, (byte) 0xbf,
        (byte) 0x63, (byte) 0xfa, (byte) 0x1f, (byte) 0x33, (byte) 0x60,
        (byte) 0x47, (byte) 0x89, (byte) 0xf0, (byte) 0x96, (byte) 0x1a,
        (byte) 0x5f, (byte) 0x93, (byte) 0x3d, (byte) 0x37, (byte) 0x4b,
        (byte) 0xd9, (byte) 0xa8, (byte) 0xc1, (byte) 0x1b, (byte) 0xf6,
        (byte) 0x39, (byte) 0x8b, (byte) 0xb7, (byte) 0x0c, (byte) 0x20,
        (byte) 0xce, (byte) 0x88, (byte) 0x6e, (byte) 0xb6, (byte) 0x74,
        (byte) 0x8e, (byte) 0x8d, (byte) 0x16, (byte) 0x29, (byte) 0xf2,
        (byte) 0x87, (byte) 0xf5, (byte) 0xeb, (byte) 0x70, (byte) 0xe3,
        (byte) 0xfb, (byte) 0x55, (byte) 0x9f, (byte) 0xc6, (byte) 0x44,
        (byte) 0x4a, (byte) 0x45, (byte) 0x7d, (byte) 0xe2, (byte) 0x6b,
        (byte) 0x5c, (byte) 0x6c, (byte) 0x66, (byte) 0xa9, (byte) 0x8c,
        (byte) 0xee, (byte) 0x84, (byte) 0x13, (byte) 0xa7, (byte) 0x1e,
        (byte) 0x9d, (byte) 0xdc, (byte) 0x67, (byte) 0x48, (byte) 0xba,
        (byte) 0x2e, (byte) 0xe6, (byte) 0xa4, (byte) 0xab, (byte) 0x7c,
        (byte) 0x94, (byte) 0x00, (byte) 0x21, (byte) 0xef, (byte) 0xea,
        (byte) 0xbe, (byte) 0xca, (byte) 0x72, (byte) 0x4f, (byte) 0x52,
        (byte) 0x98, (byte) 0x3f, (byte) 0xc2, (byte) 0x14, (byte) 0x7b,
        (byte) 0x3b, (byte) 0x54 };

    /**
     * Value generated in the same way as {@link VMPCRandomGenerator#P};
     */
    private byte s = (byte) 0xbe;

    public VMPCRandomGenerator()
    {
    }

    public void addSeedMaterial(byte[] seed)
    {
        for (int m = 0; m < seed.length; m++)
        {
            s = P[(s + P[n & 0xff] + seed[m]) & 0xff];
            byte temp = P[n & 0xff];
            P[n & 0xff] = P[s & 0xff];
            P[s & 0xff] = temp;
            n = (byte) ((n + 1) & 0xff);
        }
    }

    public void addSeedMaterial(long seed)
    {
        addSeedMaterial(Pack.longToBigEndian(seed));
    }

    public void nextBytes(byte[] bytes)
    {
        nextBytes(bytes, 0, bytes.length);
    }

    public void nextBytes(byte[] bytes, int start, int len)
    {
        synchronized (P)
        {
            int end = start + len;
            for (int i = start; i != end; i++)
            {
                s = P[(s + P[n & 0xff]) & 0xff];
                bytes[i] = P[(P[(P[s & 0xff]) & 0xff] + 1) & 0xff];
                byte temp = P[n & 0xff];
                P[n & 0xff] = P[s & 0xff];
                P[s & 0xff] = temp;
                n = (byte) ((n + 1) & 0xff);
            }
        }
    }
}




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