--- /dev/null
+/* crypt.h -- base code for traditional PKWARE encryption
+ Version 1.2.0, September 16th, 2017
+
+ Copyright (C) 2012-2017 Nathan Moinvaziri
+ https://github.com/nmoinvaz/minizip
+ Copyright (C) 1998-2005 Gilles Vollant
+ Modifications for Info-ZIP crypting
+ http://www.winimage.com/zLibDll/minizip.html
+ Copyright (C) 2003 Terry Thorsen
+
+ This code is a modified version of crypting code in Info-ZIP distribution
+
+ Copyright (C) 1990-2000 Info-ZIP. All rights reserved.
+
+ This program is distributed under the terms of the same license as zlib.
+ See the accompanying LICENSE file for the full text of the license.
+*/
+
+#ifndef _MINICRYPT_H
+#define _MINICRYPT_H
+
+#if ZLIB_VERNUM < 0x1270
+typedef unsigned long z_crc_t;
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define RAND_HEAD_LEN 12
+
+/***************************************************************************/
+
+#define zdecode(pkeys,pcrc_32_tab,c) \
+ (update_keys(pkeys,pcrc_32_tab, c ^= decrypt_byte(pkeys)))
+
+#define zencode(pkeys,pcrc_32_tab,c,t) \
+ (t = decrypt_byte(pkeys), update_keys(pkeys,pcrc_32_tab,c), t^(c))
+
+/***************************************************************************/
+
+/* Return the next byte in the pseudo-random sequence */
+uint8_t decrypt_byte(uint32_t *pkeys);
+
+/* Update the encryption keys with the next byte of plain text */
+uint8_t update_keys(uint32_t *pkeys, const z_crc_t *pcrc_32_tab, int32_t c);
+
+/* Initialize the encryption keys and the random header according to the given password. */
+void init_keys(const char *passwd, uint32_t *pkeys, const z_crc_t *pcrc_32_tab);
+
+/* Generate cryptographically secure random numbers */
+int cryptrand(unsigned char *buf, unsigned int len);
+
+/* Create encryption header */
+int crypthead(const char *passwd, uint8_t *buf, int buf_size, uint32_t *pkeys,
+ const z_crc_t *pcrc_32_tab, uint8_t verify1, uint8_t verify2);
+
+/***************************************************************************/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif