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The Bouncy Castle Java APIs for the TLS, including a JSSE provider. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.tls.crypto;

/**
 * Interface for MAC services based on HMAC.
 */
public interface TlsHMAC
    extends TlsMAC
{
    /**
     * Return the internal block size for the message digest underlying this HMAC service.
     *
     * @return the internal block size for the digest (in bytes).
     */
    int getInternalBlockSize();
}