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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.tls;

import java.security.SecureRandom;

import org.spongycastle.crypto.CryptoException;
import org.spongycastle.crypto.Signer;
import org.spongycastle.crypto.params.AsymmetricKeyParameter;

interface TlsSigner
{
    byte[] calculateRawSignature(SecureRandom random, AsymmetricKeyParameter privateKey, byte[] md5andsha1)
        throws CryptoException;

    Signer createVerifyer(AsymmetricKeyParameter publicKey);

    boolean isValidPublicKey(AsymmetricKeyParameter publicKey);
}