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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.impl;

/**
 * Base interface for a generic TLS MAC implementation for use with a cipher suite.
 */
public interface TlsSuiteMac
{
    /**
     * Return the output length (in bytes) of this MAC.
     *
     * @return The output length of this MAC.
     */
    int getSize();

    /**
     * Calculate the MAC for some given data.
     *
     * @param type    The message type of the message.
     * @param message A byte array containing the message.
     * @param offset  The number of bytes to skip, before the message starts.
     * @param length  The length of the message.
     * @return A new byte array containing the MAC value.
     */
    byte[] calculateMac(long seqNo, short type, byte[] message, int offset, int length);

    /**
     * Constant time calculation of the MAC for some given data with a given expected length.
     *
     * @param seqNo The sequence number of the cipher text.
     * @param type The content type of the message.
     * @param message A byte array containing the message.
     * @param offset The number of bytes to skip, before the message starts.
     * @param length The length of the message.
     * @param expectedLength The expected length of the full message,
     * @param randomData Random data for padding out the MAC calculation if required.
     * @return A new byte array containing the MAC value.
     */
    byte[] calculateMacConstantTime(long seqNo, short type, byte[] message, int offset, int length, int expectedLength, byte[] randomData);
}