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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 FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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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();
}