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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 java.io.IOException;

public interface TlsCipher
{
    int getPlaintextLimit(int ciphertextLimit);

    byte[] encodePlaintext(long seqNo, short type, byte[] plaintext, int offset, int len)
        throws IOException;

    byte[] decodeCiphertext(long seqNo, short type, byte[] ciphertext, int offset, int len)
        throws IOException;
}