src/main/java/org/apache/commons/crypto/jna/OpenSsl10XNativeJna.java [223:318]:
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    public static native int EVP_CipherFinal_ex(PointerByReference ctx, ByteBuffer bout,
            int[] outl);

    // ENGINE API: https://www.openssl.org/docs/man1.0.2/man3/engine.html

    /**
     * Init a cipher.
     *
     * @param ctx
     *            cipher context
     * @param cipher
     *            evp cipher instance
     * @param impl
     *            engine
     * @param key
     *            key
     * @param iv
     *            iv
     * @param enc
     *            1 for encryption, 0 for decryption
     * @return 1 for success and 0 for failure.
     */
    public static native int EVP_CipherInit_ex(PointerByReference ctx, PointerByReference cipher,
            PointerByReference impl, byte[] key, byte[] iv, int enc);

    /**
     * Continues a multiple-part encryption/decryption operation.
     *
     * @param ctx
     *            cipher context
     * @param bout
     *            output byte buffer
     * @param outl
     *            output length
     * @param in
     *            input byte buffer
     * @param inl
     *            input length
     * @return 1 for success and 0 for failure.
     */
    public static native int EVP_CipherUpdate(PointerByReference ctx, ByteBuffer bout, int[] outl,
            ByteBuffer in, int inl);

    /**
     * Generates random data
     *
     * @param buf
     *            the bytes for generated random.
     * @param num
     *            buffer length
     * @return 1 on success, 0 otherwise.
     */
    public static native int RAND_bytes(ByteBuffer buf, int num);

    // Random generator
    /**
     * OpenSSL uses for random number generation
     *
     * @return pointers to the respective methods
     */
    public static native PointerByReference RAND_get_rand_method();

    /**
     * OpenSSL uses for random number generation.
     *
     * @return pointers to the respective methods
     */
    public static native PointerByReference RAND_SSLeay();

    /**
     * @see <a href="https://www.openssl.org/docs/man1.0.2/man3/SSLeay.html">Version Number</a>
     * TODO (does not appear to be used yet)
     * @return OPENSSL_VERSION_NUMBER which is a numeric release version identifier
     */
    public static native NativeLong SSLeay();

    /**
     * Retrieves version/build information about OpenSSL library.
     * This is returned by {@link OpenSslNativeJna#OpenSSLVersion(int)}
     *
     * @see <a href="https://www.openssl.org/docs/man1.0.2/man3/SSLeay_version.html">Version Info</a>
     *
     * @param type
     *            type can be SSLEAY_VERSION, SSLEAY_CFLAGS, SSLEAY_BUILT_ON...
     * @return A pointer to a constant string describing the version of the OpenSSL library or
     *         giving information about the library build.
     */
    public static native String SSLeay_version(int type);


    // ================== instance interface methods ==================

    @Override
    public PointerByReference _ENGINE_by_id(final String string) {
        return ENGINE_by_id(string);
    }
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src/main/java/org/apache/commons/crypto/jna/OpenSsl20XNativeJna.java [218:309]:
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    public static native int EVP_CipherFinal_ex(PointerByReference ctx, ByteBuffer bout,
            int[] outl);

    /**
     * Init a cipher.
     *
     * @param ctx
     *            cipher context
     * @param cipher
     *            evp cipher instance
     * @param impl
     *            engine
     * @param key
     *            key
     * @param iv
     *            iv
     * @param enc
     *            1 for encryption, 0 for decryption
     * @return 1 for success and 0 for failure.
     */
    public static native int EVP_CipherInit_ex(PointerByReference ctx, PointerByReference cipher,
            PointerByReference impl, byte[] key, byte[] iv, int enc);

    // ENGINE API: https://www.openssl.org/docs/man1.0.2/man3/engine.html

    /**
     * Continues a multiple-part encryption/decryption operation.
     *
     * @param ctx
     *            cipher context
     * @param bout
     *            output byte buffer
     * @param outl
     *            output length
     * @param in
     *            input byte buffer
     * @param inl
     *            input length
     * @return 1 for success and 0 for failure.
     */
    public static native int EVP_CipherUpdate(PointerByReference ctx, ByteBuffer bout, int[] outl,
            ByteBuffer in, int inl);

    /**
     * Generates random data.
     *
     * @param buf
     *            the bytes for generated random.
     * @param num
     *            buffer length.
     * @return 1 on success, 0 otherwise.
     */
    public static native int RAND_bytes(ByteBuffer buf, int num);

    // Random generator
    /**
     * OpenSSL uses for random number generation.
     *
     * @return pointers to the respective methods.
     */
    public static native PointerByReference RAND_get_rand_method();

    /**
     * OpenSSL uses for random number generation.
     *
     * @return pointers to the respective methods.
     */
    public static native PointerByReference RAND_SSLeay();

    /**
     * TODO (does not appear to be used yet)
     * @return OPENSSL_VERSION_NUMBER which is a numeric release version identifier
     */
    public static native NativeLong SSLeay();

    /**
     * Retrieves version/build information about OpenSSL library.
     * This is returned by {@link OpenSslNativeJna#OpenSSLVersion(int)}
     *
     * @param type
     *            type can be SSLEAY_VERSION, SSLEAY_CFLAGS, SSLEAY_BUILT_ON...
     * @return A pointer to a constant string describing the version of the OpenSSL library or
     *         giving information about the library build.
     */
    public static native String SSLeay_version(int type);

    // ================== instance interface methods ==================

    @Override
    public PointerByReference _ENGINE_by_id(final String string) {
        return ENGINE_by_id(string);
    }
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