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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for Android. Android ships with a stripped-down version of Bouncy Castle - this causes classloader collisions if you try to add an alternative (updated/complete) Bouncy Castle jar. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.

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package org.spongycastle.crypto.params;

import org.spongycastle.crypto.DerivationParameters;

/**
 * parameters for mask derivation functions.
 */
public class MGFParameters
    implements DerivationParameters
{
    byte[]  seed;

    public MGFParameters(
        byte[]  seed)
    {
        this(seed, 0, seed.length);
    }

    public MGFParameters(
        byte[]  seed,
        int     off,
        int     len)
    {
        this.seed = new byte[len];
        System.arraycopy(seed, off, this.seed, 0, len);
    }

    public byte[] getSeed()
    {
        return seed;
    }
}