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_get_domparam_params_fn dsa_get_domparam_params;
  23 static OSSL_OP_keymgmt_importkey_fn dsa_importkey;
  24 static OSSL_OP_keymgmt_exportkey_fn dsa_exportkey;
  25 static OSSL_OP_keymgmt_get_key_params_fn dsa_get_key_params;
  26
  27 static int params_to_domparams(DSA *dsa, const OSSL_PARAM params[])
  28 {
  29     const OSSL_PARAM *param_p, *param_q, *param_g;
  30     BIGNUM *p = NULL, *q = NULL, *g = NULL;
  31
  32     if (dsa == NULL)
  33         return 0;
  34
  35     param_p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_P);
  36     param_q = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_Q);
  37     param_g = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_G);
  38
  39     if ((param_p != NULL && !OSSL_PARAM_get_BN(param_p, &p))
  40         || (param_q != NULL && !OSSL_PARAM_get_BN(param_q, &q))
  41         || (param_g != NULL && !OSSL_PARAM_get_BN(param_g, &g)))
  42         goto err;
  43
  44     if (!DSA_set0_pqg(dsa, p, q, g))
  45         goto err;
  46
  47     return 1;
  48
  49  err:
  50     BN_free(p);
  51     BN_free(q);
  52     BN_free(g);
  53     return 0;
  54 }
  55
  56 static int domparams_to_params(DSA *dsa, OSSL_PARAM_BLD *tmpl)
  57 {
  58     const BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
  59
  60     if (dsa == NULL)
  61         return 0;
  62
  63     DSA_get0_pqg(dsa, &dsa_p, &dsa_q, &dsa_g);
  64     if (dsa_p != NULL
  65         && !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_P, dsa_p))
  66         return 0;
  67     if (dsa_q != NULL
  68         && !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_Q, dsa_q))
  69         return 0;
  70     if (dsa_g != NULL
  71         && !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_G, dsa_g))
  72         return 0;
  73
  74     return 1;
  75 }
  76
  77 static int params_to_key(DSA *dsa, const OSSL_PARAM params[])
  78 {
  79     const OSSL_PARAM *param_priv_key, *param_pub_key;
  80     BIGNUM *priv_key = NULL, *pub_key = NULL;
  81
  82     if (dsa == NULL)
  83         return 0;
  84
  85     if (!params_to_domparams(dsa, params))
  86         return 0;
  87
  88     param_priv_key =
  89         OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_DSA_PRIV_KEY);
  90     param_pub_key =
  91         OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_DSA_PUB_KEY);
  92
  93     /*
  94      * DSA documentation says that a public key must be present if a private key
  95      * is.
  96      */
  97     if (param_priv_key != NULL && param_pub_key == NULL)
  98         return 0;
  99
 100     if ((param_priv_key != NULL
 101          && !OSSL_PARAM_get_BN(param_priv_key, &priv_key))
 102         || (param_pub_key != NULL
 103             && !OSSL_PARAM_get_BN(param_pub_key, &pub_key)))
 104         goto err;
 105
 106     if (pub_key != NULL && !DSA_set0_key(dsa, pub_key, priv_key))
 107         goto err;
 108
 109     return 1;
 110
 111  err:
 112     BN_free(priv_key);
 113     BN_free(pub_key);
 114     return 0;
 115 }
 116
 117 static int key_to_params(DSA *dsa, OSSL_PARAM_BLD *tmpl)
 118 {
 119     const BIGNUM *priv_key = NULL, *pub_key = NULL;
 120
 121     if (dsa == NULL)
 122         return 0;
 123     if (!domparams_to_params(dsa, tmpl))
 124         return 0;
 125
 126     DSA_get0_key(dsa, &pub_key, &priv_key);
 127     if (priv_key != NULL
 128         && !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_DSA_PRIV_KEY, priv_key))
 129         return 0;
 130     if (pub_key != NULL
 131         && !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_DSA_PUB_KEY, pub_key))
 132         return 0;
 133
 134     return 1;
 135 }
 136
 137 static void *dsa_importdomparams(void *provctx, const OSSL_PARAM params[])
 138 {
 139     DSA *dsa;
 140
 141     if ((dsa = DSA_new()) == NULL
 142         || !params_to_domparams(dsa, params)) {
 143         DSA_free(dsa);
 144         dsa = NULL;
 145     }
 146     return dsa;
 147 }
 148
 149 static int dsa_exportdomparams(void *domparams,
 150                                OSSL_CALLBACK *param_cb, void *cbarg)
 151 {
 152     DSA *dsa = domparams;
 153     OSSL_PARAM_BLD tmpl;
 154     OSSL_PARAM *params = NULL;
 155     int ret;
 156
 157     ossl_param_bld_init(&tmpl);
 158     if (dsa == NULL
 159         || !domparams_to_params(dsa, &tmpl)
 160         || (params = ossl_param_bld_to_param(&tmpl)) == NULL)
 161         return 0;
 162     ret = param_cb(params, cbarg);
 163     ossl_param_bld_free(params);
 164     return ret;
 165 }
 166
 167 static void *dsa_importkey(void *provctx, const OSSL_PARAM params[])
 168 {
 169     DSA *dsa;
 170
 171     if ((dsa = DSA_new()) == 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 /*
 197  * Same function for domain parameters and for keys.
 198  * "dpk" = "domain parameters & keys"
 199  */
 200 static ossl_inline int dsa_get_dpk_params(void *key, OSSL_PARAM params[])
 201 {
 202     DSA *dsa = key;
 203     OSSL_PARAM *p;
 204
 205     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_BITS)) != NULL
 206         && !OSSL_PARAM_set_int(p, DSA_bits(dsa)))
 207         return 0;
 208     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_SECURITY_BITS)) != NULL
 209         && !OSSL_PARAM_set_int(p, DSA_security_bits(dsa)))
 210         return 0;
 211     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_MAX_SIZE)) != NULL
 212         && !OSSL_PARAM_set_int(p, DSA_size(dsa)))
 213         return 0;
 214     return 1;
 215 }
 216
 217 /*
 218  * We have wrapper functions to make sure we get signatures right, see
 219  * the forward declarations at the beginning of this file.
 220  */
 221 static int dsa_get_domparam_params(void *domparams, OSSL_PARAM params[])
 222 {
 223     return dsa_get_dpk_params(domparams, params);
 224 }
 225
 226 static int dsa_get_key_params(void *key, OSSL_PARAM params[])
 227 {
 228     return dsa_get_dpk_params(key, params);
 229 }
 230
 231 const OSSL_DISPATCH dsa_keymgmt_functions[] = {
 232     { OSSL_FUNC_KEYMGMT_IMPORTDOMPARAMS, (void (*)(void))dsa_importdomparams },
 233     { OSSL_FUNC_KEYMGMT_EXPORTDOMPARAMS, (void (*)(void))dsa_exportdomparams },
 234     { OSSL_FUNC_KEYMGMT_FREEDOMPARAMS, (void (*)(void))DSA_free },
 235     { OSSL_FUNC_KEYMGMT_GET_DOMPARAM_PARAMS,
 236       (void (*) (void))dsa_get_domparam_params },
 237     { OSSL_FUNC_KEYMGMT_IMPORTKEY, (void (*)(void))dsa_importkey },
 238     { OSSL_FUNC_KEYMGMT_EXPORTKEY, (void (*)(void))dsa_exportkey },
 239     { OSSL_FUNC_KEYMGMT_FREEKEY, (void (*)(void))DSA_free },
 240     { OSSL_FUNC_KEYMGMT_GET_KEY_PARAMS,  (void (*) (void))dsa_get_key_params },
 241     { 0, NULL }
 242 };