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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.tls;

import java.io.IOException;

import org.spongycastle.tls.crypto.TlsCryptoParameters;
import org.spongycastle.tls.crypto.TlsSecret;

/**
 * Base interface for a class that decrypts TLS secrets.
 */
public interface TlsCredentialedDecryptor
    extends TlsCredentials
{
    /**
     * Decrypt the passed in cipher text using the parameters available.
     *
     * @param cryptoParams the parameters to use for the decryption.
     * @param ciphertext the cipher text containing the secret.
     * @return a TlS secret.
     * @throws IOException on a parsing or decryption error.
     */
    TlsSecret decrypt(TlsCryptoParameters cryptoParams, byte[] ciphertext) throws IOException;
}