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 * Copyright (c) 2015 - 2017 The GmSSL Project.  All rights reserved.
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 *    guanzhi1980@gmail.com.
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 */

#ifndef HEADER_FFX_H
#define HEADER_FFX_H

#include <string.h>
#include <openssl/evp.h>


#define FFX_MIN_DIGITS		 6
#define FFX_MAX_DIGITS		18
#define FFX_MIN_TWEAKLEN	 4
#define FFX_MAX_TWEAKLEN	11
#define FFX_NUM_ROUNDS		10

#define FFX_TYPE_BINARY		0x04
#define FFX_TYPE_KEYWORD	0x05
#define FFX_TYPE_PASSWORD	0x08
#define FFX_TYPE_TEXT		0x09
#define FFX_TYPE_INTEGER	0x0a
#define FFX_TYPE_DIGITS		0x00
#define FFX_TYPE_CELLPHONE	0x01
#define FFX_TYPE_BANKCARD	0x02
#define FFX_TYPE_IDCARD		0x03

#ifdef __cplusplus
extern "C" {
#endif

typedef struct FFX_CTX_st FFX_CTX;

FFX_CTX *FFX_CTX_new(void);
void FFX_CTX_free(FFX_CTX *ctx);
int FFX_init(FFX_CTX *ctx, const EVP_CIPHER *cipher,
	const unsigned char *key, int flag);
int FFX_encrypt(FFX_CTX *ctx, const char *in, char *out, size_t iolen,
	unsigned char *tweak, size_t tweaklen);
int FFX_decrypt(FFX_CTX *ctx, const char *in, char *out, size_t iolen,
	unsigned char *tweak, size_t tweaklen);
int  FFX_compute_luhn(const char *in, size_t inlen);


/* BEGIN ERROR CODES */
/*
 * The following lines are auto generated by the script mkerr.pl. Any changes
 * made after this point may be overwritten when the script is next run.
 */

int ERR_load_FFX_strings(void);

/* Error codes for the FFX functions. */

/* Function codes. */
# define FFX_F_FFX_DECRYPT                                100
# define FFX_F_FFX_ENCRYPT                                101
# define FFX_F_FFX_INIT                                   102

/* Reason codes. */
# define FFX_R_ENCRYPT_INIT_FAILURE                       100
# define FFX_R_INVALID_BLOCK_SIZE                         101
# define FFX_R_INVALID_CIPHER_MODE                        102
# define FFX_R_INVALID_INPUT_DIGIT                        103
# define FFX_R_INVALID_INPUT_LENGTH                       104
# define FFX_R_INVALID_TWEAK_LENGTH                       105

# ifdef  __cplusplus
}
# endif
#endif