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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 message digest, or hash, services.
 */
public interface TlsHash
{
    /**
     * Update the hash with the passed in input.
     *
     * @param input input array containing the data.
     * @param inOff offset into the input array the input starts at.
     * @param length the length of the input data.
     */
    void update(byte[] input, int inOff, int length);

    /**
     * Return calculated hash for any input passed in.
     *
     * @return the hash value.
     */
    byte[] calculateHash();

    /**
     * Return a clone of this hash object representing its current state.
     *
     * @return a clone of the current hash.
     */
    Object clone();

    /**
     * Reset the hash underlying this service.
     */
    void reset();
}