/******************************************************************************/
/* SlunkCrypt, by LoRd_MuldeR <MuldeR2@GMX.de>                                */
/* This work has been released under the CC0 1.0 Universal license!           */
/******************************************************************************/

#ifndef INC_SLUNKCRYPT_H
#define INC_SLUNKCRYPT_H

#include <stdlib.h>
#include <stdint.h>

/*
 * Version info
 */
extern const uint16_t SLUNKCRYPT_VERSION_MAJOR;
extern const uint16_t SLUNKCRYPT_VERSION_MINOR;
extern const uint16_t SLUNKCRYPT_VERSION_PATCH;

/*
 * Build date and time
 */
extern const char *const SLUNKCRYPT_BUILD;

/*
 * Abort flag
 */
extern volatile int g_slunkcrypt_abort_flag;

/*
 * Opaque handle to internal state
 */
typedef uintptr_t slunkcrypt_t;
#define SLUNKCRYPT_NULL ((slunkcrypt_t)NULL)

/*
 * Error codes
 */
static const int SLUNKCRYPT_SUCCESS =  0;
static const int SLUNKCRYPT_FAILURE = -1;
static const int SLUNKCRYPT_ABORTED = -2;

/*
 * Limits
 */
static const size_t SLUNKCRYPT_PWDLEN_MIN =   5U;
static const size_t SLUNKCRYPT_PWDLEN_MAX = 512U;

/*
 * Seed generator
 */
int slunkcrypt_generate_seed(uint64_t* const seed);

/*
 * Allocate, reset or free state
 */
slunkcrypt_t slunkcrypt_alloc(const uint64_t salt, const uint8_t *const passwd, const size_t passwd_len);
int slunkcrypt_reset(const slunkcrypt_t context, const uint64_t salt, const uint8_t *const passwd, const size_t passwd_len);
void slunkcrypt_free(const slunkcrypt_t context);

/*
 * Encryption routines
 */
int slunkcrypt_encrypt(const slunkcrypt_t context, const uint8_t *const input, uint8_t* const output, size_t length);
int slunkcrypt_encrypt_inplace(const slunkcrypt_t context, uint8_t *const buffer, size_t length);

/*
 * Decryption routines
 */
int slunkcrypt_decrypt(const slunkcrypt_t context, const uint8_t *const input, uint8_t *const output, size_t length);
int slunkcrypt_decrypt_inplace(const slunkcrypt_t context, uint8_t* const buffer, size_t length);

/*
 * Auxiliary functions
 */
int slunkcrypt_random_bytes(uint8_t* const buffer, const size_t length);
void slunkcrypt_bzero(void* const ptr, const size_t length);

#endif