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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.crypto.tls;

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

public interface TlsSigner
{
    void init(TlsContext context);

    byte[] generateRawSignature(AsymmetricKeyParameter privateKey, byte[] md5AndSha1)
        throws CryptoException;

    byte[] generateRawSignature(SignatureAndHashAlgorithm algorithm,
        AsymmetricKeyParameter privateKey, byte[] hash)
        throws CryptoException;

    boolean verifyRawSignature(byte[] sigBytes, AsymmetricKeyParameter publicKey, byte[] md5AndSha1)
        throws CryptoException;

    boolean verifyRawSignature(SignatureAndHashAlgorithm algorithm, byte[] sigBytes,
        AsymmetricKeyParameter publicKey, byte[] hash)
        throws CryptoException;

    Signer createSigner(AsymmetricKeyParameter privateKey);

    Signer createSigner(SignatureAndHashAlgorithm algorithm, AsymmetricKeyParameter privateKey);

    Signer createVerifyer(AsymmetricKeyParameter publicKey);

    Signer createVerifyer(SignatureAndHashAlgorithm algorithm, AsymmetricKeyParameter publicKey);

    boolean isValidPublicKey(AsymmetricKeyParameter publicKey);
}