Examples of org.bouncycastle.crypto.prng.DigestRandomGenerator

org.bouncycastle.crypto.prng.DigestRandomGenerator
Random generation based on the digest with counter. Calling addSeedMaterial will always increase the entropy of the hash.
Internal access to the digest is synchronized so a single one of these can be shared.

        // compute c1 = E(r, z)
        byte[] c1 = McElieceCCA2Primitives.encryptionPrimitive((McElieceCCA2PublicKeyParameters)key, r, z)
            .getEncoded();


        // get PRNG object
        DigestRandomGenerator sr0 = new DigestRandomGenerator(new SHA1Digest());


        // seed PRNG with r'
        sr0.addSeedMaterial(rBytes);


        // generate random c2
        byte[] c2 = new byte[input.length];
        sr0.nextBytes(c2);


        // XOR with input
        for (int i = 0; i < input.length; i++)
        {
            c2[i] ^= input[i];

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        byte[] rBytes = decC1[0].getEncoded();
        // ... and obtain error vector z
        GF2Vector z = decC1[1];


        // get PRNG object
        DigestRandomGenerator sr0 = new DigestRandomGenerator(new SHA1Digest());


        // seed PRNG with r'
        sr0.addSeedMaterial(rBytes);


        // generate random sequence
        byte[] mBytes = new byte[c2Len];
        sr0.nextBytes(mBytes);


        // XOR with c2 to obtain m
        for (int i = 0; i < c2Len; i++)
        {
            mBytes[i] ^= c2[i];

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        byte[] r = new byte[c2Len];
        sr.nextBytes(r);


        // get PRNG object
                // get PRNG object
        DigestRandomGenerator sr0 = new DigestRandomGenerator(new SHA1Digest());


        // seed PRNG with r'
        sr0.addSeedMaterial(r);


        // generate random sequence ...
        byte[] c1 = new byte[c1Len];
        sr0.nextBytes(c1);


        // ... and XOR with (m||const) to obtain c1
        for (int i = c1Len - 1; i >= 0; i--)
        {
            c1[i] ^= mConst[i];

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        {
            rPrime[i] ^= c2[i];
        }


        // get PRNG object
        DigestRandomGenerator sr0 = new DigestRandomGenerator(new SHA1Digest());


        // seed PRNG with r'
        sr0.addSeedMaterial(rPrime);


        // generate random sequence R(r') ...
        byte[] mConstPrime = new byte[c1Len];
        sr0.nextBytes(mConstPrime);


        // ... and XOR with c1 to obtain (m||const')
        for (int i = c1Len - 1; i >= 0; i--)
        {
            mConstPrime[i] ^= c1[i];

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        // compute c1 = E(rPrime, z)
        byte[] c1 = McElieceCCA2Primitives.encryptionPrimitive((McElieceCCA2PublicKeyParameters)key, rPrime,
            z).getEncoded();


        // get PRNG object
        DigestRandomGenerator sr0 = new DigestRandomGenerator(new SHA1Digest());


        // seed PRNG with r'
        sr0.addSeedMaterial(rPrimeBytes);


        // generate random c2
        byte[] c2 = new byte[input.length + kDiv8];
        sr0.nextBytes(c2);


        // XOR with input
        for (int i = 0; i < input.length; i++)
        {
            c2[i] ^= input[i];

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        byte[] rPrimeBytes = c1Dec[0].getEncoded();
        // ... and obtain error vector z
        GF2Vector z = c1Dec[1];


        // get PRNG object
        DigestRandomGenerator sr0 = new DigestRandomGenerator(new SHA1Digest());


        // seed PRNG with r'
        sr0.addSeedMaterial(rPrimeBytes);


        // generate random sequence
        byte[] mrBytes = new byte[c2Len];
        sr0.nextBytes(mrBytes);


        // XOR with c2 to obtain (m||r)
        for (int i = 0; i < c2Len; i++)
        {
            mrBytes[i] ^= c2[i];

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    // public constructors
    public SecureRandom()
    {
        super(0);
        this.generator = new DigestRandomGenerator(new SHA1Digest());
        setSeed(System.currentTimeMillis());
    }

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    }


    public SecureRandom(byte[] inSeed)
    {
        super(0);
        this.generator = new DigestRandomGenerator(new SHA1Digest());
        setSeed(inSeed);
    }

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    // public class methods
    public static SecureRandom getInstance(String algorithm)
    {
        if (algorithm.equals("SHA1PRNG"))
        {
            return new SecureRandom(new DigestRandomGenerator(new SHA1Digest()));
        }
        if (algorithm.equals("SHA256PRNG"))
        {
            return new SecureRandom(new DigestRandomGenerator(new SHA256Digest()));
        }
        return new SecureRandom();    // follow old behaviour
    }

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Related Classes of org.bouncycastle.crypto.prng.DigestRandomGenerator

org.bouncycastle.pqc.crypto.mceliece.McElieceFujisakiCipher

org.bouncycastle.pqc.crypto.mceliece.McElieceKobaraImaiCipher

org.bouncycastle.pqc.crypto.mceliece.McEliecePointchevalCipher

java.security.SecureRandom

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