mirror of https://github.com/openssl/openssl.git
376 lines
10 KiB
C
376 lines
10 KiB
C
/*
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* Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/*
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* DH low level APIs are deprecated for public use, but still ok for
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* internal use.
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*/
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#include "internal/deprecated.h"
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#include <openssl/core_numbers.h>
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#include <openssl/core_names.h>
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#include <openssl/bn.h>
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#include <openssl/dh.h>
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#include <openssl/params.h>
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#include "prov/implementations.h"
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#include "prov/providercommon.h"
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#include "prov/provider_ctx.h"
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#include "crypto/dh.h"
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#include "internal/param_build.h"
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static OSSL_OP_keymgmt_new_fn dh_newdata;
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static OSSL_OP_keymgmt_free_fn dh_freedata;
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static OSSL_OP_keymgmt_get_params_fn dh_get_params;
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static OSSL_OP_keymgmt_gettable_params_fn dh_gettable_params;
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static OSSL_OP_keymgmt_has_fn dh_has;
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static OSSL_OP_keymgmt_match_fn dh_match;
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static OSSL_OP_keymgmt_validate_fn dh_validate;
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static OSSL_OP_keymgmt_import_fn dh_import;
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static OSSL_OP_keymgmt_import_types_fn dh_import_types;
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static OSSL_OP_keymgmt_export_fn dh_export;
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static OSSL_OP_keymgmt_export_types_fn dh_export_types;
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#define DH_POSSIBLE_SELECTIONS \
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(OSSL_KEYMGMT_SELECT_KEYPAIR | OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS)
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static int params_to_domparams(DH *dh, const OSSL_PARAM params[])
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{
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const OSSL_PARAM *param_p, *param_g;
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BIGNUM *p = NULL, *g = NULL;
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if (dh == NULL)
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return 0;
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param_p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_P);
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param_g = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_G);
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if ((param_p != NULL && !OSSL_PARAM_get_BN(param_p, &p))
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|| (param_g != NULL && !OSSL_PARAM_get_BN(param_g, &g)))
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goto err;
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if (!DH_set0_pqg(dh, p, NULL, g))
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goto err;
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return 1;
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err:
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BN_free(p);
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BN_free(g);
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return 0;
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}
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static int domparams_to_params(DH *dh, OSSL_PARAM_BLD *tmpl)
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{
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const BIGNUM *dh_p = NULL, *dh_g = NULL;
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if (dh == NULL)
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return 0;
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DH_get0_pqg(dh, &dh_p, NULL, &dh_g);
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if (dh_p != NULL
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&& !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_P, dh_p))
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return 0;
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if (dh_g != NULL
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&& !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_G, dh_g))
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return 0;
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return 1;
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}
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static int params_to_key(DH *dh, const OSSL_PARAM params[])
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{
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const OSSL_PARAM *param_priv_key, *param_pub_key;
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BIGNUM *priv_key = NULL, *pub_key = NULL;
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if (dh == NULL)
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return 0;
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if (!params_to_domparams(dh, params))
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return 0;
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param_priv_key =
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OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PRIV_KEY);
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param_pub_key =
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OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PUB_KEY);
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/*
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* DH documentation says that a public key must be present if a
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* private key is present.
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* We want to have at least a public key either way, so we end up
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* requiring it unconditionally.
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*/
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if (param_pub_key == NULL)
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return 0;
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if ((param_priv_key != NULL
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&& !OSSL_PARAM_get_BN(param_priv_key, &priv_key))
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|| !OSSL_PARAM_get_BN(param_pub_key, &pub_key))
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goto err;
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if (!DH_set0_key(dh, pub_key, priv_key))
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goto err;
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return 1;
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err:
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BN_clear_free(priv_key);
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BN_free(pub_key);
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return 0;
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}
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static int key_to_params(DH *dh, OSSL_PARAM_BLD *tmpl)
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{
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const BIGNUM *priv_key = NULL, *pub_key = NULL;
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if (dh == NULL)
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return 0;
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if (!domparams_to_params(dh, tmpl))
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return 0;
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DH_get0_key(dh, &pub_key, &priv_key);
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if (priv_key != NULL
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&& !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_PRIV_KEY, priv_key))
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return 0;
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if (pub_key != NULL
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&& !ossl_param_bld_push_BN(tmpl, OSSL_PKEY_PARAM_PUB_KEY, pub_key))
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return 0;
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return 1;
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}
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static void *dh_newdata(void *provctx)
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{
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return dh_new_with_ctx(PROV_LIBRARY_CONTEXT_OF(provctx));
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}
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static void dh_freedata(void *keydata)
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{
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DH_free(keydata);
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}
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static int dh_has(void *keydata, int selection)
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{
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DH *dh = keydata;
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int ok = 0;
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if (dh != NULL) {
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if ((selection & DH_POSSIBLE_SELECTIONS) != 0)
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ok = 1;
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if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
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ok = ok && (DH_get0_pub_key(dh) != NULL);
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if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
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ok = ok && (DH_get0_priv_key(dh) != NULL);
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if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
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ok = ok && (DH_get0_p(dh) != NULL && DH_get0_g(dh) != NULL);
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}
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return ok;
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}
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static int dh_match(const void *keydata1, const void *keydata2, int selection)
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{
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const DH *dh1 = keydata1;
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const DH *dh2 = keydata2;
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int ok = 1;
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if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
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ok = ok && BN_cmp(DH_get0_pub_key(dh1), DH_get0_pub_key(dh2)) == 0;
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if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
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ok = ok && BN_cmp(DH_get0_priv_key(dh1), DH_get0_priv_key(dh2)) == 0;
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if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) {
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FFC_PARAMS *dhparams1 = dh_get0_params((DH *)dh1);
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FFC_PARAMS *dhparams2 = dh_get0_params((DH *)dh2);
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ok = ok && ffc_params_cmp(dhparams1, dhparams2, 1);
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}
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return ok;
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}
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static int dh_import(void *keydata, int selection, const OSSL_PARAM params[])
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{
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DH *dh = keydata;
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int ok = 0;
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if (dh == NULL)
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return 0;
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if ((selection & DH_POSSIBLE_SELECTIONS) != 0)
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ok = 1;
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if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
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ok = ok && params_to_domparams(dh, params);
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if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
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ok = ok && params_to_key(dh, params);
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return ok;
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}
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static int dh_export(void *keydata, int selection, OSSL_CALLBACK *param_cb,
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void *cbarg)
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{
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DH *dh = keydata;
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OSSL_PARAM_BLD tmpl;
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OSSL_PARAM *params = NULL;
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int ok = 1;
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if (dh == NULL)
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return 0;
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ossl_param_bld_init(&tmpl);
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if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
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ok = ok && domparams_to_params(dh, &tmpl);
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if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
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ok = ok && key_to_params(dh, &tmpl);
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if (!ok
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|| (params = ossl_param_bld_to_param(&tmpl)) == NULL)
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return 0;
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ok = param_cb(params, cbarg);
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ossl_param_bld_free(params);
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return ok;
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}
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/* IMEXPORT = IMPORT + EXPORT */
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# define DH_IMEXPORTABLE_PARAMETERS \
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_P, NULL, 0), \
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_G, NULL, 0)
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# define DH_IMEXPORTABLE_PUBLIC_KEY \
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_PUB_KEY, NULL, 0)
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# define DH_IMEXPORTABLE_PRIVATE_KEY \
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OSSL_PARAM_BN(OSSL_PKEY_PARAM_PRIV_KEY, NULL, 0)
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static const OSSL_PARAM dh_all_types[] = {
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DH_IMEXPORTABLE_PARAMETERS,
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DH_IMEXPORTABLE_PUBLIC_KEY,
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DH_IMEXPORTABLE_PRIVATE_KEY,
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OSSL_PARAM_END
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};
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static const OSSL_PARAM dh_parameter_types[] = {
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DH_IMEXPORTABLE_PARAMETERS,
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OSSL_PARAM_END
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};
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static const OSSL_PARAM dh_key_types[] = {
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DH_IMEXPORTABLE_PUBLIC_KEY,
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DH_IMEXPORTABLE_PRIVATE_KEY,
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OSSL_PARAM_END
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};
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static const OSSL_PARAM *dh_types[] = {
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NULL, /* Index 0 = none of them */
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dh_parameter_types, /* Index 1 = parameter types */
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dh_key_types, /* Index 2 = key types */
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dh_all_types /* Index 3 = 1 + 2 */
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};
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static const OSSL_PARAM *dh_imexport_types(int selection)
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{
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int type_select = 0;
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if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
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type_select += 1;
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if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
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type_select += 2;
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return dh_types[type_select];
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}
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static const OSSL_PARAM *dh_import_types(int selection)
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{
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return dh_imexport_types(selection);
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}
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static const OSSL_PARAM *dh_export_types(int selection)
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{
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return dh_imexport_types(selection);
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}
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static ossl_inline int dh_get_params(void *key, OSSL_PARAM params[])
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{
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DH *dh = key;
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OSSL_PARAM *p;
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if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_BITS)) != NULL
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&& !OSSL_PARAM_set_int(p, DH_bits(dh)))
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return 0;
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if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_SECURITY_BITS)) != NULL
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&& !OSSL_PARAM_set_int(p, DH_security_bits(dh)))
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return 0;
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if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_MAX_SIZE)) != NULL
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&& !OSSL_PARAM_set_int(p, DH_size(dh)))
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return 0;
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return 1;
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}
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static const OSSL_PARAM dh_params[] = {
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OSSL_PARAM_int(OSSL_PKEY_PARAM_BITS, NULL),
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OSSL_PARAM_int(OSSL_PKEY_PARAM_SECURITY_BITS, NULL),
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OSSL_PARAM_int(OSSL_PKEY_PARAM_MAX_SIZE, NULL),
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OSSL_PARAM_END
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};
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static const OSSL_PARAM *dh_gettable_params(void)
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{
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return dh_params;
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}
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static int dh_validate_public(DH *dh)
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{
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const BIGNUM *pub_key = NULL;
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DH_get0_key(dh, &pub_key, NULL);
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return DH_check_pub_key_ex(dh, pub_key);
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}
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static int dh_validate_private(DH *dh)
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{
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int status = 0;
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const BIGNUM *priv_key = NULL;
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DH_get0_key(dh, NULL, &priv_key);
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return dh_check_priv_key(dh, priv_key, &status);;
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}
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static int dh_validate(void *keydata, int selection)
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{
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DH *dh = keydata;
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int ok = 0;
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if ((selection & DH_POSSIBLE_SELECTIONS) != 0)
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ok = 1;
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if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
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ok = ok && DH_check_params_ex(dh);
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if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
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ok = ok && dh_validate_public(dh);
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if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
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ok = ok && dh_validate_private(dh);
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if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR)
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== OSSL_KEYMGMT_SELECT_KEYPAIR)
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ok = ok && dh_check_pairwise(dh);
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return ok;
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}
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const OSSL_DISPATCH dh_keymgmt_functions[] = {
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{ OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))dh_newdata },
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{ OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))dh_freedata },
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{ OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))dh_get_params },
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{ OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))dh_gettable_params },
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{ OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))dh_has },
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{ OSSL_FUNC_KEYMGMT_MATCH, (void (*)(void))dh_match },
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{ OSSL_FUNC_KEYMGMT_VALIDATE, (void (*)(void))dh_validate },
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{ OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))dh_import },
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{ OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))dh_import_types },
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{ OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))dh_export },
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{ OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))dh_export_types },
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{ 0, NULL }
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};
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