#ifndef _OTP_H
#define _OTP_H
#include <stdlib.h>
#include <time.h>
enum {OTPKEYSIZE = 8};
typedef unsigned char OtpKey[OTPKEYSIZE];
#define OTP_MIN_PASSPHRASE 10
#define OTP_MAX_PASSPHRASE 63
#define OTP_USER_TIMEOUT 120
#define OTP_DB_TIMEOUT 60
#define OTP_HEXPREFIX "hex:"
#define OTP_WORDPREFIX "word:"
typedef enum { OTP_ALG_MD4, OTP_ALG_MD5, OTP_ALG_SHA } OtpAlgID;
#define OTP_ALG_DEFAULT "md5"
typedef struct {
OtpAlgID id;
char *name;
int hashsize;
int (*hash)(const char *, size_t, unsigned char *);
int (*init)(OtpKey, const char *, const char *);
int (*next)(OtpKey);
} OtpAlgorithm;
typedef struct {
char *user;
OtpAlgorithm *alg;
unsigned n;
char seed[17];
OtpKey key;
int challengep;
time_t lock_time;
char *err;
} OtpContext;
OtpAlgorithm *otp_find_alg (char *);
void otp_print_stddict (OtpKey, char *, size_t);
void otp_print_hex (OtpKey, char *, size_t);
void otp_print_stddict_extended (OtpKey, char *, size_t);
void otp_print_hex_extended (OtpKey, char *, size_t);
unsigned otp_checksum (OtpKey);
int otp_parse_hex (OtpKey, const char *);
int otp_parse_stddict (OtpKey, const char *);
int otp_parse_altdict (OtpKey, const char *, OtpAlgorithm *);
int otp_parse (OtpKey, const char *, OtpAlgorithm *);
int otp_challenge (OtpContext *, char *, char *, size_t);
int otp_verify_user (OtpContext *, const char *);
int otp_verify_user_1 (OtpContext *, const char *);
char *otp_error (OtpContext *);
void *otp_db_open (void);
void otp_db_close (void *);
int otp_put (void *, OtpContext *);
int otp_get (void *, OtpContext *);
int otp_simple_get (void *, OtpContext *);
int otp_delete (void *, OtpContext *);
#endif