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The Bouncy Castle Java APIs for the OpenPGP Protocol. 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.openpgp.operator;

import java.io.InputStream;

/**
 * A decryptor that wraps a stream of PGP encrypted data to decrypt, and optionally integrity check,
 * the data.
 */
public interface PGPDataDecryptor
{
    /**
     * Wraps an encrypted data stream with a stream that will return the decrypted data.
     *
     * @param in the encrypted data.
     * @return a decrypting stream.
     */
    InputStream getInputStream(InputStream in);

    /**
     * Obtains the block size of the encryption algorithm used in this decryptor.
     *
     * @return the block size of the cipher in bytes.
     */
    int getBlockSize();

    /**
     * Obtains the digest calculator used to verify the integrity check.
     */
    PGPDigestCalculator getIntegrityCalculator();
}