src/main/java/org/apache/commons/crypto/jna/OpenSsl11XNativeJna.java [163:237]:
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    public static native PointerByReference EVP_CIPHER_CTX_new();

    /**
     * Clears all information from a cipher context and free up any allocated * memory associate
     * with it.
     *
     * @param c
     *            openssl evp cipher
     */

    /**
     * Enables or disables padding
     *
     * @param c
     *            cipher context
     * @param pad
     *            If the pad parameter is zero then no padding is performed
     * @return always returns 1
     */
    public static native int EVP_CIPHER_CTX_set_padding(PointerByReference c, int pad);

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

    // ENGINE API: https://www.openssl.org/docs/man1.1.1/man3/ENGINE_add.html
    // (The above page includes all the ENGINE functions used below)

    /**
     * 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);
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src/main/java/org/apache/commons/crypto/jna/OpenSsl20XNativeJna.java [194:259]:
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    public static native PointerByReference EVP_CIPHER_CTX_new();

    /**
     * Enables or disables padding.
     *
     * @param c
     *            cipher context.
     * @param pad
     *            If the pad parameter is zero then no padding is performed.
     * @return always returns 1
     */
    public static native int EVP_CIPHER_CTX_set_padding(PointerByReference c, int pad);

    /**
     * Finishes a multiple-part operation.
     *
     * @param ctx
     *            cipher context
     * @param bout
     *            output byte buffer
     * @param outl
     *            output length
     * @return 1 for success and 0 for failure.
     */
    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);
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