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 /*
  11  * DSA low level APIs are deprecated for public use, but still ok for
  12  * internal use.
  13  */
  14 #include "internal/deprecated.h"
  15
  16 #include <openssl/core_numbers.h>
  17 #include <openssl/core_names.h>
  18 #include <openssl/bn.h>
  19 #include <openssl/params.h>
  20 #include "internal/param_build.h"
  21 #include "crypto/dsa.h"
  22 #include "prov/implementations.h"
  23 #include "prov/providercommon.h"
  24 #include "prov/provider_ctx.h"
  25 #include "crypto/dsa.h"
  26
  27 static OSSL_OP_keymgmt_new_fn dsa_newdata;
  28 static OSSL_OP_keymgmt_free_fn dsa_freedata;
  29 static OSSL_OP_keymgmt_get_params_fn dsa_get_params;
  30 static OSSL_OP_keymgmt_gettable_params_fn dsa_gettable_params;
  31 static OSSL_OP_keymgmt_has_fn dsa_has;
  32 static OSSL_OP_keymgmt_import_fn dsa_import;
  33 static OSSL_OP_keymgmt_import_types_fn dsa_import_types;
  34 static OSSL_OP_keymgmt_export_fn dsa_export;
  35 static OSSL_OP_keymgmt_export_types_fn dsa_export_types;
  36
  37 #define DSA_DEFAULT_MD "SHA256"
  38 #define DSA_POSSIBLE_SELECTIONS                 \
  39     (OSSL_KEYMGMT_SELECT_KEYPAIR | OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS)
  40
  41 static int params_to_domparams(DSA *dsa, const OSSL_PARAM params[])
  42 {
  43     const OSSL_PARAM *param_p, *param_q, *param_g;
  44     BIGNUM *p = NULL, *q = NULL, *g = NULL;
  45
  46     if (dsa == NULL)
  47         return 0;
  48
  49     param_p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_P);
  50     param_q = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_Q);
  51     param_g = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_G);
  52
  53     if ((param_p != NULL && !OSSL_PARAM_get_BN(param_p, &p))
  54         || (param_q != NULL && !OSSL_PARAM_get_BN(param_q, &q))
  55         || (param_g != NULL && !OSSL_PARAM_get_BN(param_g, &g)))
  56         goto err;
  57
  58     if (!DSA_set0_pqg(dsa, p, q, g))
  59         goto err;
  60
  61     return 1;
  62
  63  err:
  64     BN_free(p);
  65     BN_free(q);
  66     BN_free(g);
  67     return 0;
  68 }
  69
  70 static int domparams_to_params(DSA *dsa, OSSL_PARAM_BLD *tmpl)
  71 {
  72     const BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
  73
  74     if (dsa == NULL)
  75         return 0;
  76
  77     DSA_get0_pqg(dsa, &dsa_p, &dsa_q, &dsa_g);
  78     if (dsa_p != NULL
  79         && !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_P, dsa_p))
  80         return 0;
  81     if (dsa_q != NULL
  82         && !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_Q, dsa_q))
  83         return 0;
  84     if (dsa_g != NULL
  85         && !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_G, dsa_g))
  86         return 0;
  87
  88     return 1;
  89 }
  90
  91 static int params_to_key(DSA *dsa, const OSSL_PARAM params[])
  92 {
  93     const OSSL_PARAM *param_priv_key, *param_pub_key;
  94     BIGNUM *priv_key = NULL, *pub_key = NULL;
  95
  96     if (dsa == NULL)
  97         return 0;
  98
  99     if (!params_to_domparams(dsa, params))
 100         return 0;
 101
 102     param_priv_key =
 103         OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PRIV_KEY);
 104     param_pub_key =
 105         OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PUB_KEY);
 106
 107     /*
 108      * DSA documentation says that a public key must be present if a private key
 109      * is.
 110      */
 111     if (param_priv_key != NULL && param_pub_key == NULL)
 112         return 0;
 113
 114     if ((param_priv_key != NULL
 115          && !OSSL_PARAM_get_BN(param_priv_key, &priv_key))
 116         || (param_pub_key != NULL
 117             && !OSSL_PARAM_get_BN(param_pub_key, &pub_key)))
 118         goto err;
 119
 120     if (pub_key != NULL && !DSA_set0_key(dsa, pub_key, priv_key))
 121         goto err;
 122
 123     return 1;
 124
 125  err:
 126     BN_free(priv_key);
 127     BN_free(pub_key);
 128     return 0;
 129 }
 130
 131 static int key_to_params(DSA *dsa, OSSL_PARAM_BLD *tmpl)
 132 {
 133     const BIGNUM *priv_key = NULL, *pub_key = NULL;
 134
 135     if (dsa == NULL)
 136         return 0;
 137     if (!domparams_to_params(dsa, tmpl))
 138         return 0;
 139
 140     DSA_get0_key(dsa, &pub_key, &priv_key);
 141     if (priv_key != NULL
 142         && !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_PRIV_KEY, priv_key))
 143         return 0;
 144     if (pub_key != NULL
 145         && !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_PUB_KEY, pub_key))
 146         return 0;
 147
 148     return 1;
 149 }
 150
 151 static void *dsa_newdata(void *provctx)
 152 {
 153     return DSA_new();
 154 }
 155
 156 static void dsa_freedata(void *keydata)
 157 {
 158     DSA_free(keydata);
 159 }
 160
 161 static int dsa_has(void *keydata, int selection)
 162 {
 163     DSA *dsa = keydata;
 164     int ok = 0;
 165
 166     if ((selection & DSA_POSSIBLE_SELECTIONS) != 0)
 167         ok = 1;
 168
 169     if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
 170         ok = ok && (DSA_get0_pub_key(dsa) != NULL);
 171     if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
 172         ok = ok && (DSA_get0_priv_key(dsa) != NULL);
 173     if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
 174         ok = ok && (DSA_get0_p(dsa) != NULL && DSA_get0_g(dsa) != NULL);
 175     return ok;
 176 }
 177
 178 static int dsa_import(void *keydata, int selection, const OSSL_PARAM params[])
 179 {
 180     DSA *dsa = keydata;
 181     int ok = 0;
 182
 183     if (dsa == NULL)
 184         return 0;
 185
 186     if ((selection & DSA_POSSIBLE_SELECTIONS) != 0)
 187         ok = 1;
 188
 189     if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
 190         ok = ok && params_to_domparams(dsa, params);
 191     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 192         ok = ok && params_to_key(dsa, params);
 193
 194     return ok;
 195 }
 196
 197 static int dsa_export(void *keydata, int selection, OSSL_CALLBACK *param_cb,
 198                       void *cbarg)
 199 {
 200     DSA *dsa = keydata;
 201     OSSL_PARAM_BLD tmpl;
 202     OSSL_PARAM *params = NULL;
 203     int ok = 1;
 204
 205     if (dsa == NULL)
 206         return 0;
 207
 208     ossl_param_bld_init(&tmpl);
 209
 210     if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
 211         ok = ok && domparams_to_params(dsa, &tmpl);
 212     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 213         ok = ok && key_to_params(dsa, &tmpl);
 214
 215     if (!ok
 216         || (params = ossl_param_bld_to_param(&tmpl)) == NULL)
 217         return 0;
 218
 219     ok = param_cb(params, cbarg);
 220     ossl_param_bld_free(params);
 221     return ok;
 222 }
 223
 224 /* IMEXPORT = IMPORT + EXPORT */
 225
 226 # define DSA_IMEXPORTABLE_PARAMETERS                    \
 227     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_P, NULL, 0),      \
 228     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_Q, NULL, 0),      \
 229     OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_G, NULL, 0)
 230 # define DSA_IMEXPORTABLE_PUBLIC_KEY                    \
 231     OSSL_PARAM_BN(OSSL_PKEY_PARAM_PUB_KEY, NULL, 0)
 232 # define DSA_IMEXPORTABLE_PRIVATE_KEY                   \
 233     OSSL_PARAM_BN(OSSL_PKEY_PARAM_PRIV_KEY, NULL, 0)
 234 static const OSSL_PARAM dsa_all_types[] = {
 235     DSA_IMEXPORTABLE_PARAMETERS,
 236     DSA_IMEXPORTABLE_PUBLIC_KEY,
 237     DSA_IMEXPORTABLE_PRIVATE_KEY,
 238     OSSL_PARAM_END
 239 };
 240 static const OSSL_PARAM dsa_parameter_types[] = {
 241     DSA_IMEXPORTABLE_PARAMETERS,
 242     OSSL_PARAM_END
 243 };
 244 static const OSSL_PARAM dsa_key_types[] = {
 245     DSA_IMEXPORTABLE_PUBLIC_KEY,
 246     DSA_IMEXPORTABLE_PRIVATE_KEY,
 247     OSSL_PARAM_END
 248 };
 249 static const OSSL_PARAM *dsa_types[] = {
 250     NULL,                        /* Index 0 = none of them */
 251     dsa_parameter_types,          /* Index 1 = parameter types */
 252     dsa_key_types,                /* Index 2 = key types */
 253     dsa_all_types                 /* Index 3 = 1 + 2 */
 254 };
 255
 256 static const OSSL_PARAM *dsa_imexport_types(int selection)
 257 {
 258     int type_select = 0;
 259
 260     if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
 261         type_select += 1;
 262     if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
 263         type_select += 2;
 264     return dsa_types[type_select];
 265 }
 266
 267 static const OSSL_PARAM *dsa_import_types(int selection)
 268 {
 269     return dsa_imexport_types(selection);
 270 }
 271
 272 static const OSSL_PARAM *dsa_export_types(int selection)
 273 {
 274     return dsa_imexport_types(selection);
 275 }
 276
 277 static ossl_inline int dsa_get_params(void *key, OSSL_PARAM params[])
 278 {
 279     DSA *dsa = key;
 280     OSSL_PARAM *p;
 281
 282     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_BITS)) != NULL
 283         && !OSSL_PARAM_set_int(p, DSA_bits(dsa)))
 284         return 0;
 285     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_SECURITY_BITS)) != NULL
 286         && !OSSL_PARAM_set_int(p, DSA_security_bits(dsa)))
 287         return 0;
 288     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_MAX_SIZE)) != NULL
 289         && !OSSL_PARAM_set_int(p, DSA_size(dsa)))
 290         return 0;
 291     if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_DEFAULT_DIGEST)) != NULL
 292         && !OSSL_PARAM_set_utf8_string(p, DSA_DEFAULT_MD))
 293         return 0;
 294     return 1;
 295 }
 296
 297 static const OSSL_PARAM dsa_params[] = {
 298     OSSL_PARAM_int(OSSL_PKEY_PARAM_BITS, NULL),
 299     OSSL_PARAM_int(OSSL_PKEY_PARAM_SECURITY_BITS, NULL),
 300     OSSL_PARAM_int(OSSL_PKEY_PARAM_MAX_SIZE, NULL),
 301     OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_DEFAULT_DIGEST, NULL, 0),
 302     OSSL_PARAM_END
 303 };
 304
 305 static const OSSL_PARAM *dsa_gettable_params(void)
 306 {
 307     return dsa_params;
 308 }
 309
 310 const OSSL_DISPATCH dsa_keymgmt_functions[] = {
 311     { OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))dsa_newdata },
 312     { OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))dsa_freedata },
 313     { OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))dsa_get_params },
 314     { OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))dsa_gettable_params },
 315     { OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))dsa_has },
 316     { OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))dsa_import },
 317     { OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))dsa_import_types },
 318     { OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))dsa_export },
 319     { OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))dsa_export_types },
 320     { 0, NULL }
 321 };