crypto/ffc/ffc_dh.c

   1 /*
   2  * Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include "internal/ffc.h"
  11 #include "internal/nelem.h"
  12 #include "crypto/bn_dh.h"
  13
  14 #ifndef OPENSSL_NO_DH
  15
  16 # define FFDHE(sz) {                                                        \
  17         SN_ffdhe##sz, NID_ffdhe##sz,                                        \
  18         sz,                                                                 \
  19         &ossl_bignum_ffdhe##sz##_p, &ossl_bignum_ffdhe##sz##_q,             \
  20         &ossl_bignum_const_2,                                               \
  21     }
  22
  23 # define MODP(sz)  {                                                        \
  24         SN_modp_##sz, NID_modp_##sz,                                        \
  25         sz,                                                                 \
  26         &ossl_bignum_modp_##sz##_p, &ossl_bignum_modp_##sz##_q,             \
  27         &ossl_bignum_const_2                                                \
  28     }
  29
  30 # define RFC5114(name, uid, sz, tag) {                                      \
  31         name, uid,                                                          \
  32         sz,                                                                 \
  33         &ossl_bignum_dh##tag##_p, &ossl_bignum_dh##tag##_q,                 \
  34         &ossl_bignum_dh##tag##_g                                            \
  35     }
  36
  37 #else
  38
  39 # define FFDHE(sz)                      { SN_ffdhe##sz, NID_ffdhe##sz }
  40 # define MODP(sz)                       { SN_modp_##sz, NID_modp_##sz }
  41 # define RFC5114(name, uid, sz, tag)    { name, uid }
  42
  43 #endif
  44
  45 struct dh_named_group_st {
  46     const char *name;
  47     int uid;
  48 #ifndef OPENSSL_NO_DH
  49     int32_t nbits;
  50     const BIGNUM *p;
  51     const BIGNUM *q;
  52     const BIGNUM *g;
  53 #endif
  54 };
  55
  56 static const DH_NAMED_GROUP dh_named_groups[] = {
  57     FFDHE(2048),
  58     FFDHE(3072),
  59     FFDHE(4096),
  60     FFDHE(6144),
  61     FFDHE(8192),
  62 #ifndef FIPS_MODULE
  63     MODP(1536),
  64 #endif
  65     MODP(2048),
  66     MODP(3072),
  67     MODP(4096),
  68     MODP(6144),
  69     MODP(8192),
  70     /*
  71      * Additional dh named groups from RFC 5114 that have a different g.
  72      * The uid can be any unique identifier.
  73      */
  74 #ifndef FIPS_MODULE
  75     RFC5114("dh_1024_160", 1, 1024, 1024_160),
  76     RFC5114("dh_2048_224", 2, 2048, 2048_224),
  77     RFC5114("dh_2048_256", 3, 2048, 2048_256),
  78 #endif
  79 };
  80
  81 const DH_NAMED_GROUP *ossl_ffc_name_to_dh_named_group(const char *name)
  82 {
  83     size_t i;
  84
  85     for (i = 0; i < OSSL_NELEM(dh_named_groups); ++i) {
  86         if (OPENSSL_strcasecmp(dh_named_groups[i].name, name) == 0)
  87             return &dh_named_groups[i];
  88     }
  89     return NULL;
  90 }
  91
  92 const DH_NAMED_GROUP *ossl_ffc_uid_to_dh_named_group(int uid)
  93 {
  94     size_t i;
  95
  96     for (i = 0; i < OSSL_NELEM(dh_named_groups); ++i) {
  97         if (dh_named_groups[i].uid == uid)
  98             return &dh_named_groups[i];
  99     }
 100     return NULL;
 101 }
 102
 103 #ifndef OPENSSL_NO_DH
 104 const DH_NAMED_GROUP *ossl_ffc_numbers_to_dh_named_group(const BIGNUM *p,
 105                                                          const BIGNUM *q,
 106                                                          const BIGNUM *g)
 107 {
 108     size_t i;
 109
 110     for (i = 0; i < OSSL_NELEM(dh_named_groups); ++i) {
 111         /* Keep searching until a matching p and g is found */
 112         if (BN_cmp(p, dh_named_groups[i].p) == 0
 113             && BN_cmp(g, dh_named_groups[i].g) == 0
 114             /* Verify q is correct if it exists */
 115             && (q == NULL || BN_cmp(q, dh_named_groups[i].q) == 0))
 116             return &dh_named_groups[i];
 117     }
 118     return NULL;
 119 }
 120 #endif
 121
 122 int ossl_ffc_named_group_get_uid(const DH_NAMED_GROUP *group)
 123 {
 124     if (group == NULL)
 125         return NID_undef;
 126     return group->uid;
 127 }
 128
 129 const char *ossl_ffc_named_group_get_name(const DH_NAMED_GROUP *group)
 130 {
 131     if (group == NULL)
 132         return NULL;
 133     return group->name;
 134 }
 135
 136 #ifndef OPENSSL_NO_DH
 137 const BIGNUM *ossl_ffc_named_group_get_q(const DH_NAMED_GROUP *group)
 138 {
 139     if (group == NULL)
 140         return NULL;
 141     return group->q;
 142 }
 143
 144 int ossl_ffc_named_group_set_pqg(FFC_PARAMS *ffc, const DH_NAMED_GROUP *group)
 145 {
 146     if (ffc == NULL || group == NULL)
 147         return 0;
 148
 149     ossl_ffc_params_set0_pqg(ffc, (BIGNUM *)group->p, (BIGNUM *)group->q,
 150                              (BIGNUM *)group->g);
 151
 152     /* flush the cached nid, The DH layer is responsible for caching */
 153     ffc->nid = NID_undef;
 154     return 1;
 155 }
 156 #endif