include/openssl/srp.h

   1 /*
   2  * Written by Christophe Renou (christophe.renou@edelweb.fr) with the
   3  * precious help of Peter Sylvester (peter.sylvester@edelweb.fr) for the
   4  * EdelKey project and contributed to the OpenSSL project 2004.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2004 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 #ifndef __SRP_H__
  60 # define __SRP_H__
  61
  62 #include <openssl/opensslconf.h>
  63
  64 # ifdef OPENSSL_NO_SRP
  65 #  error SRP is disabled.
  66 # endif
  67
  68 # include <stdio.h>
  69 # include <string.h>
  70
  71 #ifdef  __cplusplus
  72 extern "C" {
  73 #endif
  74
  75 # include <openssl/safestack.h>
  76 # include <openssl/bn.h>
  77 # include <openssl/crypto.h>
  78
  79 typedef struct SRP_gN_cache_st {
  80     char *b64_bn;
  81     BIGNUM *bn;
  82 } SRP_gN_cache;
  83
  84
  85 DEFINE_STACK_OF(SRP_gN_cache)
  86
  87 typedef struct SRP_user_pwd_st {
  88     char *id;
  89     BIGNUM *s;
  90     BIGNUM *v;
  91     const BIGNUM *g;
  92     const BIGNUM *N;
  93     char *info;
  94 } SRP_user_pwd;
  95
  96 DEFINE_STACK_OF(SRP_user_pwd)
  97
  98 typedef struct SRP_VBASE_st {
  99     STACK_OF(SRP_user_pwd) *users_pwd;
 100     STACK_OF(SRP_gN_cache) *gN_cache;
 101 /* to simulate a user */
 102     char *seed_key;
 103     BIGNUM *default_g;
 104     BIGNUM *default_N;
 105 } SRP_VBASE;
 106
 107 /*
 108  * Structure interne pour retenir les couples N et g
 109  */
 110 typedef struct SRP_gN_st {
 111     char *id;
 112     BIGNUM *g;
 113     BIGNUM *N;
 114 } SRP_gN;
 115
 116 DEFINE_STACK_OF(SRP_gN)
 117
 118 SRP_VBASE *SRP_VBASE_new(char *seed_key);
 119 void SRP_VBASE_free(SRP_VBASE *vb);
 120 int SRP_VBASE_init(SRP_VBASE *vb, char *verifier_file);
 121 SRP_user_pwd *SRP_VBASE_get_by_user(SRP_VBASE *vb, char *username);
 122 char *SRP_create_verifier(const char *user, const char *pass, char **salt,
 123                           char **verifier, const char *N, const char *g);
 124 int SRP_create_verifier_BN(const char *user, const char *pass, BIGNUM **salt,
 125                            BIGNUM **verifier, const BIGNUM *N,
 126                            const BIGNUM *g);
 127
 128 # define SRP_NO_ERROR 0
 129 # define SRP_ERR_VBASE_INCOMPLETE_FILE 1
 130 # define SRP_ERR_VBASE_BN_LIB 2
 131 # define SRP_ERR_OPEN_FILE 3
 132 # define SRP_ERR_MEMORY 4
 133
 134 # define DB_srptype      0
 135 # define DB_srpverifier  1
 136 # define DB_srpsalt      2
 137 # define DB_srpid        3
 138 # define DB_srpgN        4
 139 # define DB_srpinfo      5
 140 # undef  DB_NUMBER
 141 # define DB_NUMBER       6
 142
 143 # define DB_SRP_INDEX    'I'
 144 # define DB_SRP_VALID    'V'
 145 # define DB_SRP_REVOKED  'R'
 146 # define DB_SRP_MODIF    'v'
 147
 148 /* see srp.c */
 149 char *SRP_check_known_gN_param(BIGNUM *g, BIGNUM *N);
 150 SRP_gN *SRP_get_default_gN(const char *id);
 151
 152 /* server side .... */
 153 BIGNUM *SRP_Calc_server_key(BIGNUM *A, BIGNUM *v, BIGNUM *u, BIGNUM *b,
 154                             BIGNUM *N);
 155 BIGNUM *SRP_Calc_B(BIGNUM *b, BIGNUM *N, BIGNUM *g, BIGNUM *v);
 156 int SRP_Verify_A_mod_N(BIGNUM *A, BIGNUM *N);
 157 BIGNUM *SRP_Calc_u(BIGNUM *A, BIGNUM *B, BIGNUM *N);
 158
 159 /* client side .... */
 160 BIGNUM *SRP_Calc_x(BIGNUM *s, const char *user, const char *pass);
 161 BIGNUM *SRP_Calc_A(BIGNUM *a, BIGNUM *N, BIGNUM *g);
 162 BIGNUM *SRP_Calc_client_key(BIGNUM *N, BIGNUM *B, BIGNUM *g, BIGNUM *x,
 163                             BIGNUM *a, BIGNUM *u);
 164 int SRP_Verify_B_mod_N(BIGNUM *B, BIGNUM *N);
 165
 166 # define SRP_MINIMAL_N 1024
 167
 168 #ifdef  __cplusplus
 169 }
 170 #endif
 171
 172 #endif