providers/implementations/keymgmt/dsa_kmgmt.c

   1 /*
   2  * Copyright 2019 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 <openssl/core_numbers.h>
  11 #include <openssl/core_names.h>
  12 #include <openssl/bn.h>
  13 #include <openssl/params.h>
  14 #include "internal/param_build.h"
  15 #include "prov/implementations.h"
  16 #include "prov/providercommon.h"
  17 #include "prov/provider_ctx.h"
  18 #include "crypto/dsa.h"
  19
  20 static OSSL_OP_keymgmt_importdomparams_fn dsa_importdomparams;
  21 static OSSL_OP_keymgmt_exportdomparams_fn dsa_exportdomparams;
  22 static OSSL_OP_keymgmt_importkey_fn dsa_importkey;
  23 static OSSL_OP_keymgmt_exportkey_fn dsa_exportkey;
  24
  25 static int params_to_domparams(DSA *dsa, const OSSL_PARAM params[])
  26 {
  27     const OSSL_PARAM *param_p, *param_q, *param_g;
  28     BIGNUM *p = NULL, *q = NULL, *g = NULL;
  29
  30     if (dsa == NULL)
  31         return 0;
  32
  33     param_p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_P);
  34     param_q = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_Q);
  35     param_g = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_G);
  36
  37     if ((param_p != NULL && !OSSL_PARAM_get_BN(param_p, &p))
  38         || (param_q != NULL && !OSSL_PARAM_get_BN(param_q, &q))
  39         || (param_g != NULL && !OSSL_PARAM_get_BN(param_g, &g)))
  40         goto err;
  41
  42     if (!DSA_set0_pqg(dsa, p, q, g))
  43         goto err;
  44
  45     return 1;
  46
  47  err:
  48     BN_free(p);
  49     BN_free(q);
  50     BN_free(g);
  51     return 0;
  52 }
  53
  54 static int domparams_to_params(DSA *dsa, OSSL_PARAM_BLD *tmpl)
  55 {
  56     const BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
  57
  58     if (dsa == NULL)
  59         return 0;
  60
  61     DSA_get0_pqg(dsa, &dsa_p, &dsa_q, &dsa_g);
  62     if (dsa_p != NULL
  63         && !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_P, dsa_p))
  64         return 0;
  65     if (dsa_q != NULL
  66         && !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_Q, dsa_q))
  67         return 0;
  68     if (dsa_g != NULL
  69         && !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_G, dsa_g))
  70         return 0;
  71
  72     return 1;
  73 }
  74
  75 static int params_to_key(DSA *dsa, const OSSL_PARAM params[])
  76 {
  77     const OSSL_PARAM *param_priv_key, *param_pub_key;
  78     BIGNUM *priv_key = NULL, *pub_key = NULL;
  79
  80     if (dsa == NULL)
  81         return 0;
  82
  83     if (!params_to_domparams(dsa, params))
  84         return 0;
  85
  86     param_priv_key =
  87         OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_DSA_PRIV_KEY);
  88     param_pub_key =
  89         OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_DSA_PUB_KEY);
  90
  91     /*
  92      * DSA documentation says that a public key must be present if a private key
  93      * is.
  94      */
  95     if (param_priv_key != NULL && param_pub_key == NULL)
  96         return 0;
  97
  98     if ((param_priv_key != NULL
  99          && !OSSL_PARAM_get_BN(param_priv_key, &priv_key))
 100         || (param_pub_key != NULL
 101             && !OSSL_PARAM_get_BN(param_pub_key, &pub_key)))
 102         goto err;
 103
 104     if (pub_key != NULL && !DSA_set0_key(dsa, pub_key, priv_key))
 105         goto err;
 106
 107     return 1;
 108
 109  err:
 110     BN_free(priv_key);
 111     BN_free(pub_key);
 112     return 0;
 113 }
 114
 115 static int key_to_params(DSA *dsa, OSSL_PARAM_BLD *tmpl)
 116 {
 117     const BIGNUM *priv_key = NULL, *pub_key = NULL;
 118
 119     if (dsa == NULL)
 120         return 0;
 121     if (!domparams_to_params(dsa, tmpl))
 122         return 0;
 123
 124     DSA_get0_key(dsa, &pub_key, &priv_key);
 125     if (priv_key != NULL
 126         && !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_DSA_PRIV_KEY, priv_key))
 127         return 0;
 128     if (pub_key != NULL
 129         && !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_DSA_PUB_KEY, pub_key))
 130         return 0;
 131
 132     return 1;
 133 }
 134
 135 static void *dsa_importdomparams(void *provctx, const OSSL_PARAM params[])
 136 {
 137     DSA *dsa;
 138     OPENSSL_CTX *libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
 139
 140     if ((dsa = dsa_new(libctx)) == NULL
 141         || !params_to_domparams(dsa, params)) {
 142         DSA_free(dsa);
 143         dsa = NULL;
 144     }
 145     return dsa;
 146 }
 147
 148 static int dsa_exportdomparams(void *domparams,
 149                                OSSL_CALLBACK *param_cb, void *cbarg)
 150 {
 151     DSA *dsa = domparams;
 152     OSSL_PARAM_BLD tmpl;
 153     OSSL_PARAM *params = NULL;
 154     int ret;
 155
 156     ossl_param_bld_init(&tmpl);
 157     if (dsa == NULL
 158         || !domparams_to_params(dsa, &tmpl)
 159         || (params = ossl_param_bld_to_param(&tmpl)) == NULL)
 160         return 0;
 161     ret = param_cb(params, cbarg);
 162     ossl_param_bld_free(params);
 163     return ret;
 164 }
 165
 166 static void *dsa_importkey(void *provctx, const OSSL_PARAM params[])
 167 {
 168     DSA *dsa;
 169     OPENSSL_CTX *libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
 170
 171     if ((dsa = dsa_new(libctx)) == NULL
 172         || !params_to_key(dsa, params)) {
 173         DSA_free(dsa);
 174         dsa = NULL;
 175     }
 176     return dsa;
 177 }
 178
 179 static int dsa_exportkey(void *key, OSSL_CALLBACK *param_cb, void *cbarg)
 180 {
 181     DSA *dsa = key;
 182     OSSL_PARAM_BLD tmpl;
 183     OSSL_PARAM *params = NULL;
 184     int ret;
 185
 186     ossl_param_bld_init(&tmpl);
 187     if (dsa == NULL
 188         || !key_to_params(dsa, &tmpl)
 189         || (params = ossl_param_bld_to_param(&tmpl)) == NULL)
 190         return 0;
 191     ret = param_cb(params, cbarg);
 192     ossl_param_bld_free(params);
 193     return ret;
 194 }
 195
 196 const OSSL_DISPATCH dsa_keymgmt_functions[] = {
 197     /*
 198      * TODO(3.0) When implementing OSSL_FUNC_KEYMGMT_GENKEY, remember to also
 199      * implement OSSL_FUNC_KEYMGMT_EXPORTKEY.
 200      */
 201     { OSSL_FUNC_KEYMGMT_IMPORTDOMPARAMS, (void (*)(void))dsa_importdomparams },
 202     { OSSL_FUNC_KEYMGMT_EXPORTDOMPARAMS, (void (*)(void))dsa_exportdomparams },
 203     { OSSL_FUNC_KEYMGMT_FREEDOMPARAMS, (void (*)(void))DSA_free },
 204     { OSSL_FUNC_KEYMGMT_IMPORTKEY, (void (*)(void))dsa_importkey },
 205     { OSSL_FUNC_KEYMGMT_EXPORTKEY, (void (*)(void))dsa_exportkey },
 206     { OSSL_FUNC_KEYMGMT_FREEKEY, (void (*)(void))DSA_free },
 207     { 0, NULL }
 208 };