/*

 * Copyright 2004-2018 The OpenSSL Project Authors. All Rights Reserved.

 * Copyright (c) 2004, EdelKey Project. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 *

 * Originally written by Christophe Renou and Peter Sylvester,

 * for the EdelKey project.

 */

#ifndef HEADER_SRP_H

# define HEADER_SRP_H

#include <openssl/opensslconf.h>

#ifndef OPENSSL_NO_SRP

# include <stdio.h>

# include <string.h>

# include <openssl/safestack.h>

# include <openssl/bn.h>

# include <openssl/crypto.h>

# ifdef  __cplusplus

extern "C" {

# endif

typedef struct SRP_gN_cache_st {

    char *b64_bn;

    BIGNUM *bn;

} SRP_gN_cache;

DEFINE_STACK_OF(SRP_gN_cache)

typedef struct SRP_user_pwd_st {

    /* Owned by us. */

    char *id;

    BIGNUM *s;

    BIGNUM *v;

    /* Not owned by us. */

    const BIGNUM *g;

    const BIGNUM *N;

    /* Owned by us. */

    char *info;

} SRP_user_pwd;

void SRP_user_pwd_free(SRP_user_pwd *user_pwd);

DEFINE_STACK_OF(SRP_user_pwd)

typedef struct SRP_VBASE_st {

    STACK_OF(SRP_user_pwd) *users_pwd;

    STACK_OF(SRP_gN_cache) *gN_cache;

/* to simulate a user */

    char *seed_key;

    const BIGNUM *default_g;

    const BIGNUM *default_N;

} SRP_VBASE;

/*

 * Internal structure storing N and g pair

 */

typedef struct SRP_gN_st {

    char *id;

    const BIGNUM *g;

    const BIGNUM *N;

} SRP_gN;

DEFINE_STACK_OF(SRP_gN)

SRP_VBASE *SRP_VBASE_new(char *seed_key);

void SRP_VBASE_free(SRP_VBASE *vb);

int SRP_VBASE_init(SRP_VBASE *vb, char *verifier_file);

/* This method ignores the configured seed and fails for an unknown user. */

DEPRECATEDIN_1_1_0(SRP_user_pwd *SRP_VBASE_get_by_user(SRP_VBASE *vb, char *username))

/* NOTE: unlike in SRP_VBASE_get_by_user, caller owns the returned pointer.*/

SRP_user_pwd *SRP_VBASE_get1_by_user(SRP_VBASE *vb, char *username);

char *SRP_create_verifier(const char *user, const char *pass, char **salt,

                          char **verifier, const char *N, const char *g);

int SRP_create_verifier_BN(const char *user, const char *pass, BIGNUM **salt,

                           BIGNUM **verifier, const BIGNUM *N,

                           const BIGNUM *g);

# define SRP_NO_ERROR 0

# define SRP_ERR_VBASE_INCOMPLETE_FILE 1

# define SRP_ERR_VBASE_BN_LIB 2

# define SRP_ERR_OPEN_FILE 3

# define SRP_ERR_MEMORY 4

# define DB_srptype      0

# define DB_srpverifier  1

# define DB_srpsalt      2

# define DB_srpid        3

# define DB_srpgN        4

# define DB_srpinfo      5

# undef  DB_NUMBER

# define DB_NUMBER       6

# define DB_SRP_INDEX    'I'

# define DB_SRP_VALID    'V'

# define DB_SRP_REVOKED  'R'

# define DB_SRP_MODIF    'v'

/* see srp.c */

char *SRP_check_known_gN_param(const BIGNUM *g, const BIGNUM *N);

SRP_gN *SRP_get_default_gN(const char *id);

/* server side .... */

BIGNUM *SRP_Calc_server_key(const BIGNUM *A, const BIGNUM *v, const BIGNUM *u,

                            const BIGNUM *b, const BIGNUM *N);

BIGNUM *SRP_Calc_B(const BIGNUM *b, const BIGNUM *N, const BIGNUM *g,

                   const BIGNUM *v);

int SRP_Verify_A_mod_N(const BIGNUM *A, const BIGNUM *N);

BIGNUM *SRP_Calc_u(const BIGNUM *A, const BIGNUM *B, const BIGNUM *N);

/* client side .... */

BIGNUM *SRP_Calc_x(const BIGNUM *s, const char *user, const char *pass);

BIGNUM *SRP_Calc_A(const BIGNUM *a, const BIGNUM *N, const BIGNUM *g);

BIGNUM *SRP_Calc_client_key(const BIGNUM *N, const BIGNUM *B, const BIGNUM *g,

                            const BIGNUM *x, const BIGNUM *a, const BIGNUM *u);

int SRP_Verify_B_mod_N(const BIGNUM *B, const BIGNUM *N);

# define SRP_MINIMAL_N 1024

# ifdef  __cplusplus

}

# endif

# endif

#endif