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openssl/providers/implementations/keymgmt/ec_kmgmt.c
Shane Lontis c0f39ded68 Add Explicit EC parameter support to providers. 
This was added for backward compatability.
Added EC_GROUP_new_from_params() that supports explicit curve parameters.

This fixes the 15-test_genec.t TODO.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/12604)
2020-08-22 14:55:41 +10:00

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/*
* Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/*
* ECDH/ECDSA low level APIs are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include "e_os.h" /* strcasecmp */
#include <string.h>
#include <openssl/core_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/bn.h>
#include <openssl/err.h>
#include <openssl/objects.h>
#include "crypto/bn.h"
#include "crypto/ec.h"
#include "prov/implementations.h"
#include "prov/providercommon.h"
#include "prov/providercommonerr.h"
#include "prov/provider_ctx.h"
#include "internal/param_build_set.h"
static OSSL_FUNC_keymgmt_new_fn ec_newdata;
static OSSL_FUNC_keymgmt_gen_init_fn ec_gen_init;
static OSSL_FUNC_keymgmt_gen_set_template_fn ec_gen_set_template;
static OSSL_FUNC_keymgmt_gen_set_params_fn ec_gen_set_params;
static OSSL_FUNC_keymgmt_gen_settable_params_fn ec_gen_settable_params;
static OSSL_FUNC_keymgmt_gen_fn ec_gen;
static OSSL_FUNC_keymgmt_gen_cleanup_fn ec_gen_cleanup;
static OSSL_FUNC_keymgmt_load_fn ec_load;
static OSSL_FUNC_keymgmt_free_fn ec_freedata;
static OSSL_FUNC_keymgmt_get_params_fn ec_get_params;
static OSSL_FUNC_keymgmt_gettable_params_fn ec_gettable_params;
static OSSL_FUNC_keymgmt_set_params_fn ec_set_params;
static OSSL_FUNC_keymgmt_settable_params_fn ec_settable_params;
static OSSL_FUNC_keymgmt_has_fn ec_has;
static OSSL_FUNC_keymgmt_match_fn ec_match;
static OSSL_FUNC_keymgmt_validate_fn ec_validate;
static OSSL_FUNC_keymgmt_import_fn ec_import;
static OSSL_FUNC_keymgmt_import_types_fn ec_import_types;
static OSSL_FUNC_keymgmt_export_fn ec_export;
static OSSL_FUNC_keymgmt_export_types_fn ec_export_types;
static OSSL_FUNC_keymgmt_query_operation_name_fn ec_query_operation_name;
#define EC_DEFAULT_MD "SHA256"
#define EC_POSSIBLE_SELECTIONS \
(OSSL_KEYMGMT_SELECT_KEYPAIR | OSSL_KEYMGMT_SELECT_ALL_PARAMETERS)
static
const char *ec_query_operation_name(int operation_id)
{
switch (operation_id) {
case OSSL_OP_KEYEXCH:
return "ECDH";
case OSSL_OP_SIGNATURE:
return "ECDSA";
}
return NULL;
}
/*
* Callers of key_to_params MUST make sure that domparams_to_params is also
* called!
*
* This function only exports the bare keypair, domain parameters and other
* parameters are exported separately.
*/
static ossl_inline
int key_to_params(const EC_KEY *eckey, OSSL_PARAM_BLD *tmpl,
OSSL_PARAM params[], int include_private,
unsigned char **pub_key)
{
BIGNUM *x = NULL, *y = NULL;
const BIGNUM *priv_key = NULL;
const EC_POINT *pub_point = NULL;
const EC_GROUP *ecg = NULL;
size_t pub_key_len = 0;
int ret = 0;
BN_CTX *bnctx = NULL;
if (eckey == NULL
|| (ecg = EC_KEY_get0_group(eckey)) == NULL)
return 0;
priv_key = EC_KEY_get0_private_key(eckey);
pub_point = EC_KEY_get0_public_key(eckey);
if (pub_point != NULL) {
OSSL_PARAM *p = NULL, *px = NULL, *py = NULL;
/*
* EC_POINT_point2buf() can generate random numbers in some
* implementations so we need to ensure we use the correct libctx.
*/
bnctx = BN_CTX_new_ex(ec_key_get_libctx(eckey));
if (bnctx == NULL)
goto err;
/* If we are doing a get then check first before decoding the point */
if (tmpl == NULL) {
p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_PUB_KEY);
px = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_EC_PUB_X);
py = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_EC_PUB_Y);
}
if (p != NULL || tmpl != NULL) {
/* convert pub_point to a octet string according to the SECG standard */
if ((pub_key_len = EC_POINT_point2buf(ecg, pub_point,
POINT_CONVERSION_COMPRESSED,
pub_key, bnctx)) == 0
|| !ossl_param_build_set_octet_string(tmpl, p,
OSSL_PKEY_PARAM_PUB_KEY,
*pub_key, pub_key_len))
goto err;
}
if (px != NULL || py != NULL) {
if (px != NULL)
x = BN_CTX_get(bnctx);
if (py != NULL)
y = BN_CTX_get(bnctx);
if (!EC_POINT_get_affine_coordinates(ecg, pub_point, x, y, bnctx))
goto err;
if (px != NULL
&& !ossl_param_build_set_bn(tmpl, px,
OSSL_PKEY_PARAM_EC_PUB_X, x))
goto err;
if (py != NULL
&& !ossl_param_build_set_bn(tmpl, py,
OSSL_PKEY_PARAM_EC_PUB_Y, y))
goto err;
}
}
if (priv_key != NULL && include_private) {
size_t sz;
int ecbits;
/*
* Key import/export should never leak the bit length of the secret
* scalar in the key.
*
* For this reason, on export we use padded BIGNUMs with fixed length.
*
* When importing we also should make sure that, even if short lived,
* the newly created BIGNUM is marked with the BN_FLG_CONSTTIME flag as
* soon as possible, so that any processing of this BIGNUM might opt for
* constant time implementations in the backend.
*
* Setting the BN_FLG_CONSTTIME flag alone is never enough, we also have
* to preallocate the BIGNUM internal buffer to a fixed public size big
* enough that operations performed during the processing never trigger
* a realloc which would leak the size of the scalar through memory
* accesses.
*
* Fixed Length
* ------------
*
* The order of the large prime subgroup of the curve is our choice for
* a fixed public size, as that is generally the upper bound for
* generating a private key in EC cryptosystems and should fit all valid
* secret scalars.
*
* For padding on export we just use the bit length of the order
* converted to bytes (rounding up).
*
* For preallocating the BIGNUM storage we look at the number of "words"
* required for the internal representation of the order, and we
* preallocate 2 extra "words" in case any of the subsequent processing
* might temporarily overflow the order length.
*/
ecbits = EC_GROUP_order_bits(ecg);
if (ecbits <= 0)
goto err;
sz = (ecbits + 7 ) / 8;
if (!ossl_param_build_set_bn_pad(tmpl, params,
OSSL_PKEY_PARAM_PRIV_KEY,
priv_key, sz))
goto err;
}
ret = 1;
err:
BN_CTX_free(bnctx);
return ret;
}
static ossl_inline
int otherparams_to_params(const EC_KEY *ec, OSSL_PARAM_BLD *tmpl,
OSSL_PARAM params[])
{
int ecdh_cofactor_mode = 0;
if (ec == NULL)
return 0;
ecdh_cofactor_mode =
(EC_KEY_get_flags(ec) & EC_FLAG_COFACTOR_ECDH) ? 1 : 0;
return ossl_param_build_set_int(tmpl, params,
OSSL_PKEY_PARAM_USE_COFACTOR_ECDH,
ecdh_cofactor_mode);
}
static
void *ec_newdata(void *provctx)
{
return EC_KEY_new_with_libctx(PROV_LIBRARY_CONTEXT_OF(provctx), NULL);
}
static
void ec_freedata(void *keydata)
{
EC_KEY_free(keydata);
}
static
int ec_has(void *keydata, int selection)
{
EC_KEY *ec = keydata;
int ok = 0;
if (ec != NULL) {
if ((selection & EC_POSSIBLE_SELECTIONS) != 0)
ok = 1;
if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
ok = ok && (EC_KEY_get0_public_key(ec) != NULL);
if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
ok = ok && (EC_KEY_get0_private_key(ec) != NULL);
if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
ok = ok && (EC_KEY_get0_group(ec) != NULL);
/*
* We consider OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS to always be
* available, so no extra check is needed other than the previous one
* against EC_POSSIBLE_SELECTIONS.
*/
}
return ok;
}
static int ec_match(const void *keydata1, const void *keydata2, int selection)
{
const EC_KEY *ec1 = keydata1;
const EC_KEY *ec2 = keydata2;
const EC_GROUP *group_a = EC_KEY_get0_group(ec1);
const EC_GROUP *group_b = EC_KEY_get0_group(ec2);
BN_CTX *ctx = BN_CTX_new_ex(ec_key_get_libctx(ec1));
int ok = 1;
if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
ok = ok && group_a != NULL && group_b != NULL
&& EC_GROUP_cmp(group_a, group_b, ctx) == 0;
if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0) {
const BIGNUM *pa = EC_KEY_get0_private_key(ec1);
const BIGNUM *pb = EC_KEY_get0_private_key(ec2);
ok = ok && BN_cmp(pa, pb) == 0;
}
if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0) {
const EC_POINT *pa = EC_KEY_get0_public_key(ec1);
const EC_POINT *pb = EC_KEY_get0_public_key(ec2);
ok = ok && EC_POINT_cmp(group_b, pa, pb, ctx) == 0;
}
BN_CTX_free(ctx);
return ok;
}
static
int ec_import(void *keydata, int selection, const OSSL_PARAM params[])
{
EC_KEY *ec = keydata;
int ok = 1;
if (ec == NULL)
return 0;
/*
* In this implementation, we can export/import only keydata in the
* following combinations:
* - domain parameters (+optional other params)
* - public key with associated domain parameters (+optional other params)
* - private key with associated public key and domain parameters
* (+optional other params)
*
* This means:
* - domain parameters must always be requested
* - private key must be requested alongside public key
* - other parameters are always optional
*/
if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) == 0)
return 0;
if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0
&& (selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) == 0)
return 0;
if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
ok = ok && ec_group_fromdata(ec, params);
if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
int include_private =
selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY ? 1 : 0;
ok = ok && ec_key_fromdata(ec, params, include_private);
}
if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0)
ok = ok && ec_key_otherparams_fromdata(ec, params);
return ok;
}
static
int ec_export(void *keydata, int selection, OSSL_CALLBACK *param_cb,
void *cbarg)
{
EC_KEY *ec = keydata;
OSSL_PARAM_BLD *tmpl;
OSSL_PARAM *params = NULL;
unsigned char *pub_key = NULL, *genbuf = NULL;
BN_CTX *bnctx = NULL;
int ok = 1;
if (ec == NULL)
return 0;
/*
* In this implementation, we can export/import only keydata in the
* following combinations:
* - domain parameters (+optional other params)
* - public key with associated domain parameters (+optional other params)
* - private key with associated public key and domain parameters
* (+optional other params)
*
* This means:
* - domain parameters must always be requested
* - private key must be requested alongside public key
* - other parameters are always optional
*/
if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) == 0)
return 0;
if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0
&& (selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) == 0)
return 0;
if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0
&& (selection & OSSL_KEYMGMT_SELECT_KEYPAIR) == 0)
return 0;
tmpl = OSSL_PARAM_BLD_new();
if (tmpl == NULL)
return 0;
if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) {
bnctx = BN_CTX_new_ex(ec_key_get_libctx(ec));
BN_CTX_start(bnctx);
ok = ok && (bnctx != NULL);
ok = ok && ec_group_todata(EC_KEY_get0_group(ec), tmpl, NULL,
ec_key_get_libctx(ec), ec_key_get0_propq(ec),
bnctx, &genbuf);
}
if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0) {
int include_private =
selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY ? 1 : 0;
ok = ok && key_to_params(ec, tmpl, NULL, include_private, &pub_key);
}
if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0)
ok = ok && otherparams_to_params(ec, tmpl, NULL);
if (ok && (params = OSSL_PARAM_BLD_to_param(tmpl)) != NULL)
ok = param_cb(params, cbarg);
OSSL_PARAM_BLD_free_params(params);
OSSL_PARAM_BLD_free(tmpl);
OPENSSL_free(pub_key);
OPENSSL_free(genbuf);
BN_CTX_end(bnctx);
BN_CTX_free(bnctx);
return ok;
}
/* IMEXPORT = IMPORT + EXPORT */
# define EC_IMEXPORTABLE_DOM_PARAMETERS \
OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME, NULL, 0), \
OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_ENCODING, NULL, 0), \
OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_FIELD_TYPE, NULL, 0), \
OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_P, NULL, 0), \
OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_A, NULL, 0), \
OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_B, NULL, 0), \
OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_GENERATOR, NULL, 0), \
OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_ORDER, NULL, 0), \
OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_COFACTOR, NULL, 0), \
OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_SEED, NULL, 0)
# define EC_IMEXPORTABLE_PUBLIC_KEY \
OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_PUB_KEY, NULL, 0)
# define EC_IMEXPORTABLE_PRIVATE_KEY \
OSSL_PARAM_BN(OSSL_PKEY_PARAM_PRIV_KEY, NULL, 0)
# define EC_IMEXPORTABLE_OTHER_PARAMETERS \
OSSL_PARAM_int(OSSL_PKEY_PARAM_USE_COFACTOR_ECDH, NULL)
/*
* Include all the possible combinations of OSSL_PARAM arrays for
* ec_imexport_types().
*
* They are in a separate file as it is ~100 lines of unreadable and
* uninteresting machine generated stuff.
*
* TODO(3.0): the generated list looks quite ugly, as to cover all possible
* combinations of the bits in `selection`, it also includes combinations that
* are not really useful: we might want to consider alternatives to this
* solution.
*/
#include "ec_kmgmt_imexport.inc"
static ossl_inline
const OSSL_PARAM *ec_imexport_types(int selection)
{
int type_select = 0;
if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
type_select += 1;
if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
type_select += 2;
if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
type_select += 4;
if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0)
type_select += 8;
return ec_types[type_select];
}
static
const OSSL_PARAM *ec_import_types(int selection)
{
return ec_imexport_types(selection);
}
static
const OSSL_PARAM *ec_export_types(int selection)
{
return ec_imexport_types(selection);
}
static int ec_get_ecm_params(const EC_GROUP *group, OSSL_PARAM params[])
{
#ifdef OPENSSL_NO_EC2M
return 1;
#else
int ret = 0, m;
unsigned int k1 = 0, k2 = 0, k3 = 0;
int basis_nid;
const char *basis_name = NULL;
int fid = EC_GROUP_get_field_type(group);
if (fid != NID_X9_62_characteristic_two_field)
return 1;
basis_nid = EC_GROUP_get_basis_type(group);
if (basis_nid == NID_X9_62_tpBasis)
basis_name = SN_X9_62_tpBasis;
else if (basis_nid == NID_X9_62_ppBasis)
basis_name = SN_X9_62_ppBasis;
else
goto err;
m = EC_GROUP_get_degree(group);
if (!ossl_param_build_set_int(NULL, params, OSSL_PKEY_PARAM_EC_CHAR2_M, m)
|| !ossl_param_build_set_utf8_string(NULL, params,
OSSL_PKEY_PARAM_EC_CHAR2_TYPE,
basis_name))
goto err;
if (basis_nid == NID_X9_62_tpBasis) {
if (!EC_GROUP_get_trinomial_basis(group, &k1)
|| !ossl_param_build_set_int(NULL, params,
OSSL_PKEY_PARAM_EC_CHAR2_TP_BASIS,
(int)k1))
goto err;
} else {
if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3)
|| !ossl_param_build_set_int(NULL, params,
OSSL_PKEY_PARAM_EC_CHAR2_PP_K1, (int)k1)
|| !ossl_param_build_set_int(NULL, params,
OSSL_PKEY_PARAM_EC_CHAR2_PP_K2, (int)k2)
|| !ossl_param_build_set_int(NULL, params,
OSSL_PKEY_PARAM_EC_CHAR2_PP_K3, (int)k3))
goto err;
}
ret = 1;
err:
return ret;
#endif /* OPENSSL_NO_EC2M */
}
static
int ec_get_params(void *key, OSSL_PARAM params[])
{
int ret = 0;
EC_KEY *eck = key;
const EC_GROUP *ecg = NULL;
OSSL_PARAM *p;
unsigned char *pub_key = NULL, *genbuf = NULL;
OPENSSL_CTX *libctx;
const char *propq;
BN_CTX *bnctx = NULL;
ecg = EC_KEY_get0_group(eck);
if (ecg == NULL)
return 0;
libctx = ec_key_get_libctx(eck);
propq = ec_key_get0_propq(eck);
bnctx = BN_CTX_new_ex(libctx);
if (bnctx == NULL)
return 0;
BN_CTX_start(bnctx);
if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_MAX_SIZE)) != NULL
&& !OSSL_PARAM_set_int(p, ECDSA_size(eck)))
return 0;
if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_BITS)) != NULL
&& !OSSL_PARAM_set_int(p, EC_GROUP_order_bits(ecg)))
return 0;
if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_SECURITY_BITS)) != NULL) {
int ecbits, sec_bits;
ecbits = EC_GROUP_order_bits(ecg);
/*
* The following estimates are based on the values published
* in Table 2 of "NIST Special Publication 800-57 Part 1 Revision 4"
* at http://dx.doi.org/10.6028/NIST.SP.800-57pt1r4 .
*
* Note that the above reference explicitly categorizes algorithms in a
* discrete set of values {80, 112, 128, 192, 256}, and that it is
* relevant only for NIST approved Elliptic Curves, while OpenSSL
* applies the same logic also to other curves.
*
* Classifications produced by other standardazing bodies might differ,
* so the results provided for "bits of security" by this provider are
* to be considered merely indicative, and it is the users'
* responsibility to compare these values against the normative
* references that may be relevant for their intent and purposes.
*/
if (ecbits >= 512)
sec_bits = 256;
else if (ecbits >= 384)
sec_bits = 192;
else if (ecbits >= 256)
sec_bits = 128;
else if (ecbits >= 224)
sec_bits = 112;
else if (ecbits >= 160)
sec_bits = 80;
else
sec_bits = ecbits / 2;
if (!OSSL_PARAM_set_int(p, sec_bits))
return 0;
}
if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_DEFAULT_DIGEST)) != NULL
&& !OSSL_PARAM_set_utf8_string(p, EC_DEFAULT_MD))
return 0;
p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_USE_COFACTOR_ECDH);
if (p != NULL) {
int ecdh_cofactor_mode = 0;
ecdh_cofactor_mode =
(EC_KEY_get_flags(eck) & EC_FLAG_COFACTOR_ECDH) ? 1 : 0;
if (!OSSL_PARAM_set_int(p, ecdh_cofactor_mode))
return 0;
}
if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_TLS_ENCODED_PT)) != NULL) {
p->return_size = EC_POINT_point2oct(EC_KEY_get0_group(key),
EC_KEY_get0_public_key(key),
POINT_CONVERSION_UNCOMPRESSED,
p->data, p->return_size, bnctx);
if (p->return_size == 0)
goto err;
}
ret = ec_get_ecm_params(ecg, params)
&& ec_group_todata(ecg, NULL, params, libctx, propq, bnctx, &genbuf)
&& key_to_params(eck, NULL, params, 1, &pub_key)
&& otherparams_to_params(eck, NULL, params);
err:
OPENSSL_free(genbuf);
OPENSSL_free(pub_key);
BN_CTX_end(bnctx);
BN_CTX_free(bnctx);
return ret;
}
#ifndef OPENSSL_NO_EC2M
# define EC2M_GETTABLE_DOM_PARAMS \
OSSL_PARAM_int(OSSL_PKEY_PARAM_EC_CHAR2_M, NULL), \
OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_CHAR2_TYPE, NULL, 0), \
OSSL_PARAM_int(OSSL_PKEY_PARAM_EC_CHAR2_TP_BASIS, NULL), \
OSSL_PARAM_int(OSSL_PKEY_PARAM_EC_CHAR2_PP_K1, NULL), \
OSSL_PARAM_int(OSSL_PKEY_PARAM_EC_CHAR2_PP_K2, NULL), \
OSSL_PARAM_int(OSSL_PKEY_PARAM_EC_CHAR2_PP_K3, NULL),
#else
# define EC2M_GETTABLE_DOM_PARAMS
#endif
static const OSSL_PARAM ec_known_gettable_params[] = {
OSSL_PARAM_int(OSSL_PKEY_PARAM_BITS, NULL),
OSSL_PARAM_int(OSSL_PKEY_PARAM_SECURITY_BITS, NULL),
OSSL_PARAM_int(OSSL_PKEY_PARAM_MAX_SIZE, NULL),
OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_TLS_ENCODED_PT, NULL, 0),
EC_IMEXPORTABLE_DOM_PARAMETERS,
EC2M_GETTABLE_DOM_PARAMS
EC_IMEXPORTABLE_PUBLIC_KEY,
OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_PUB_X, NULL, 0),
OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_PUB_Y, NULL, 0),
EC_IMEXPORTABLE_PRIVATE_KEY,
EC_IMEXPORTABLE_OTHER_PARAMETERS,
OSSL_PARAM_END
};
static
const OSSL_PARAM *ec_gettable_params(void *provctx)
{
return ec_known_gettable_params;
}
static const OSSL_PARAM ec_known_settable_params[] = {
OSSL_PARAM_int(OSSL_PKEY_PARAM_USE_COFACTOR_ECDH, NULL),
OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_TLS_ENCODED_PT, NULL, 0),
OSSL_PARAM_END
};
static
const OSSL_PARAM *ec_settable_params(void *provctx)
{
return ec_known_settable_params;
}
static
int ec_set_params(void *key, const OSSL_PARAM params[])
{
EC_KEY *eck = key;
const OSSL_PARAM *p;
p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_TLS_ENCODED_PT);
if (p != NULL) {
BN_CTX *ctx = BN_CTX_new_ex(ec_key_get_libctx(key));
int ret = 1;
if (ctx == NULL
|| p->data_type != OSSL_PARAM_OCTET_STRING
|| !EC_KEY_oct2key(key, p->data, p->data_size, ctx))
ret = 0;
BN_CTX_free(ctx);
if (!ret)
return 0;
}
return ec_key_otherparams_fromdata(eck, params);
}
static
int ec_validate(void *keydata, int selection)
{
EC_KEY *eck = keydata;
int ok = 0;
BN_CTX *ctx = BN_CTX_new_ex(ec_key_get_libctx(eck));
if (ctx == NULL)
return 0;
if ((selection & EC_POSSIBLE_SELECTIONS) != 0)
ok = 1;
if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
ok = ok && EC_GROUP_check(EC_KEY_get0_group(eck), ctx);
if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
ok = ok && ec_key_public_check(eck, ctx);
if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
ok = ok && ec_key_private_check(eck);
if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) == OSSL_KEYMGMT_SELECT_KEYPAIR)
ok = ok && ec_key_pairwise_check(eck, ctx);
BN_CTX_free(ctx);
return ok;
}
struct ec_gen_ctx {
OPENSSL_CTX *libctx;
char *group_name;
char *encoding;
char *field_type;
BIGNUM *p, *a, *b, *order, *cofactor;
unsigned char *gen, *seed;
size_t gen_len, seed_len;
int selection;
int ecdh_mode;
EC_GROUP *gen_group;
};
static void *ec_gen_init(void *provctx, int selection)
{
OPENSSL_CTX *libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
struct ec_gen_ctx *gctx = NULL;
if ((selection & (EC_POSSIBLE_SELECTIONS)) == 0)
return NULL;
if ((gctx = OPENSSL_zalloc(sizeof(*gctx))) != NULL) {
gctx->libctx = libctx;
gctx->selection = selection;
gctx->ecdh_mode = 0;
}
return gctx;
}
static int ec_gen_set_group(void *genctx, const EC_GROUP *src)
{
struct ec_gen_ctx *gctx = genctx;
EC_GROUP *group;
group = EC_GROUP_dup(src);
if (group == NULL) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_CURVE);
return 0;
}
EC_GROUP_free(gctx->gen_group);
gctx->gen_group = group;
return 1;
}
static int ec_gen_set_template(void *genctx, void *templ)
{
struct ec_gen_ctx *gctx = genctx;
EC_KEY *ec = templ;
const EC_GROUP *ec_group;
if (gctx == NULL || ec == NULL)
return 0;
if ((ec_group = EC_KEY_get0_group(ec)) == NULL)
return 0;
return ec_gen_set_group(gctx, ec_group);
}
#define COPY_INT_PARAM(params, key, val) \
p = OSSL_PARAM_locate_const(params, key); \
if (p != NULL && !OSSL_PARAM_get_int(p, &val)) \
goto err;
#define COPY_UTF8_PARAM(params, key, val) \
p = OSSL_PARAM_locate_const(params, key); \
if (p != NULL) { \
if (p->data_type != OSSL_PARAM_UTF8_STRING) \
goto err; \
OPENSSL_free(val); \
val = OPENSSL_strdup(p->data); \
if (val == NULL) \
goto err; \
}
#define COPY_OCTET_PARAM(params, key, val, len) \
p = OSSL_PARAM_locate_const(params, key); \
if (p != NULL) { \
if (p->data_type != OSSL_PARAM_OCTET_STRING) \
goto err; \
OPENSSL_free(val); \
len = p->data_size; \
val = OPENSSL_memdup(p->data, p->data_size); \
if (val == NULL) \
goto err; \
}
#define COPY_BN_PARAM(params, key, bn) \
p = OSSL_PARAM_locate_const(params, key); \
if (p != NULL) { \
if (bn == NULL) \
bn = BN_new(); \
if (bn == NULL || !OSSL_PARAM_get_BN(p, &bn)) \
goto err; \
}
static int ec_gen_set_params(void *genctx, const OSSL_PARAM params[])
{
int ret = 0;
struct ec_gen_ctx *gctx = genctx;
const OSSL_PARAM *p;
EC_GROUP *group = NULL;
COPY_INT_PARAM(params, OSSL_PKEY_PARAM_USE_COFACTOR_ECDH, gctx->ecdh_mode);
COPY_UTF8_PARAM(params, OSSL_PKEY_PARAM_GROUP_NAME, gctx->group_name);
COPY_UTF8_PARAM(params, OSSL_PKEY_PARAM_EC_FIELD_TYPE, gctx->field_type);
COPY_UTF8_PARAM(params, OSSL_PKEY_PARAM_EC_ENCODING, gctx->encoding);
COPY_BN_PARAM(params, OSSL_PKEY_PARAM_EC_P, gctx->p);
COPY_BN_PARAM(params, OSSL_PKEY_PARAM_EC_A, gctx->a);
COPY_BN_PARAM(params, OSSL_PKEY_PARAM_EC_B, gctx->b);
COPY_BN_PARAM(params, OSSL_PKEY_PARAM_EC_ORDER, gctx->order);
COPY_BN_PARAM(params, OSSL_PKEY_PARAM_EC_COFACTOR, gctx->cofactor);
COPY_OCTET_PARAM(params, OSSL_PKEY_PARAM_EC_SEED, gctx->seed, gctx->seed_len);
COPY_OCTET_PARAM(params, OSSL_PKEY_PARAM_EC_GENERATOR, gctx->gen,
gctx->gen_len);
ret = 1;
err:
EC_GROUP_free(group);
return ret;
}
static int ec_gen_set_group_from_params(struct ec_gen_ctx *gctx)
{
int ret = 0;
OSSL_PARAM_BLD *bld;
OSSL_PARAM *params = NULL;
EC_GROUP *group = NULL;
bld = OSSL_PARAM_BLD_new();
if (bld == NULL)
return 0;
if (gctx->encoding != NULL
&& !OSSL_PARAM_BLD_push_utf8_string(bld, OSSL_PKEY_PARAM_EC_ENCODING,
gctx->encoding, 0))
goto err;
if (gctx->group_name != NULL) {
if (!OSSL_PARAM_BLD_push_utf8_string(bld, OSSL_PKEY_PARAM_GROUP_NAME,
gctx->group_name, 0))
goto err;
/* Ignore any other parameters if there is a group name */
goto build;
} else if (gctx->field_type != NULL) {
if (!OSSL_PARAM_BLD_push_utf8_string(bld, OSSL_PKEY_PARAM_EC_FIELD_TYPE,
gctx->field_type, 0))
goto err;
} else {
goto err;
}
if (gctx->p == NULL
|| gctx->a == NULL
|| gctx->b == NULL
|| gctx->order == NULL
|| !OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_EC_P, gctx->p)
|| !OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_EC_A, gctx->a)
|| !OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_EC_B, gctx->b)
|| !OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_EC_ORDER, gctx->order))
goto err;
if (gctx->cofactor != NULL
&& !OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_EC_COFACTOR,
gctx->cofactor))
goto err;
if (gctx->seed != NULL
&& !OSSL_PARAM_BLD_push_octet_string(bld, OSSL_PKEY_PARAM_EC_SEED,
gctx->seed, gctx->seed_len))
goto err;
if (gctx->gen == NULL
|| !OSSL_PARAM_BLD_push_octet_string(bld, OSSL_PKEY_PARAM_EC_GENERATOR,
gctx->gen, gctx->gen_len))
goto err;
build:
params = OSSL_PARAM_BLD_to_param(bld);
if (params == NULL)
goto err;
group = EC_GROUP_new_from_params(params, gctx->libctx, NULL);
if (group == NULL)
goto err;
EC_GROUP_free(gctx->gen_group);
gctx->gen_group = group;
ret = 1;
err:
OSSL_PARAM_BLD_free_params(params);
OSSL_PARAM_BLD_free(bld);
return ret;
}
static const OSSL_PARAM *ec_gen_settable_params(void *provctx)
{
static OSSL_PARAM settable[] = {
OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME, NULL, 0),
OSSL_PARAM_int(OSSL_PKEY_PARAM_USE_COFACTOR_ECDH, NULL),
OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_ENCODING, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_EC_FIELD_TYPE, NULL, 0),
OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_P, NULL, 0),
OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_A, NULL, 0),
OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_B, NULL, 0),
OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_GENERATOR, NULL, 0),
OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_ORDER, NULL, 0),
OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_COFACTOR, NULL, 0),
OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_SEED, NULL, 0),
OSSL_PARAM_END
};
return settable;
}
static int ec_gen_assign_group(EC_KEY *ec, EC_GROUP *group)
{
if (group == NULL) {
ERR_raise(ERR_LIB_PROV, PROV_R_NO_PARAMETERS_SET);
return 0;
}
return EC_KEY_set_group(ec, group) > 0;
}
/*
* The callback arguments (osslcb & cbarg) are not used by EC_KEY generation
*/
static void *ec_gen(void *genctx, OSSL_CALLBACK *osslcb, void *cbarg)
{
struct ec_gen_ctx *gctx = genctx;
EC_KEY *ec = NULL;
int ret = 0;
if (gctx == NULL
|| (ec = EC_KEY_new_with_libctx(gctx->libctx, NULL)) == NULL)
return NULL;
if (gctx->gen_group == NULL) {
if (!ec_gen_set_group_from_params(gctx))
goto err;
} else {
if (gctx->encoding) {
int flags = ec_encoding_name2id(gctx->encoding);
if (flags < 0)
goto err;
EC_GROUP_set_asn1_flag(gctx->gen_group, flags);
}
}
/* We must always assign a group, no matter what */
ret = ec_gen_assign_group(ec, gctx->gen_group);
/* Whether you want it or not, you get a keypair, not just one half */
if ((gctx->selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
ret = ret && EC_KEY_generate_key(ec);
if (gctx->ecdh_mode != -1)
ret = ret && ec_set_ecdh_cofactor_mode(ec, gctx->ecdh_mode);
if (ret)
return ec;
err:
/* Something went wrong, throw the key away */
EC_KEY_free(ec);
return NULL;
}
static void ec_gen_cleanup(void *genctx)
{
struct ec_gen_ctx *gctx = genctx;
if (gctx == NULL)
return;
EC_GROUP_free(gctx->gen_group);
BN_free(gctx->p);
BN_free(gctx->a);
BN_free(gctx->b);
BN_free(gctx->order);
BN_free(gctx->cofactor);
OPENSSL_free(gctx->group_name);
OPENSSL_free(gctx->field_type);;
OPENSSL_free(gctx->encoding);
OPENSSL_free(gctx->seed);
OPENSSL_free(gctx->gen);
OPENSSL_free(gctx);
}
void *ec_load(const void *reference, size_t reference_sz)
{
EC_KEY *ec = NULL;
if (reference_sz == sizeof(ec)) {
/* The contents of the reference is the address to our object */
ec = *(EC_KEY **)reference;
/* We grabbed, so we detach it */
*(EC_KEY **)reference = NULL;
return ec;
}
return NULL;
}
const OSSL_DISPATCH ec_keymgmt_functions[] = {
{ OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))ec_newdata },
{ OSSL_FUNC_KEYMGMT_GEN_INIT, (void (*)(void))ec_gen_init },
{ OSSL_FUNC_KEYMGMT_GEN_SET_TEMPLATE,
(void (*)(void))ec_gen_set_template },
{ OSSL_FUNC_KEYMGMT_GEN_SET_PARAMS, (void (*)(void))ec_gen_set_params },
{ OSSL_FUNC_KEYMGMT_GEN_SETTABLE_PARAMS,
(void (*)(void))ec_gen_settable_params },
{ OSSL_FUNC_KEYMGMT_GEN, (void (*)(void))ec_gen },
{ OSSL_FUNC_KEYMGMT_GEN_CLEANUP, (void (*)(void))ec_gen_cleanup },
{ OSSL_FUNC_KEYMGMT_LOAD, (void (*)(void))ec_load },
{ OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))ec_freedata },
{ OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))ec_get_params },
{ OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))ec_gettable_params },
{ OSSL_FUNC_KEYMGMT_SET_PARAMS, (void (*) (void))ec_set_params },
{ OSSL_FUNC_KEYMGMT_SETTABLE_PARAMS, (void (*) (void))ec_settable_params },
{ OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))ec_has },
{ OSSL_FUNC_KEYMGMT_MATCH, (void (*)(void))ec_match },
{ OSSL_FUNC_KEYMGMT_VALIDATE, (void (*)(void))ec_validate },
{ OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))ec_import },
{ OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))ec_import_types },
{ OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))ec_export },
{ OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))ec_export_types },
{ OSSL_FUNC_KEYMGMT_QUERY_OPERATION_NAME,
(void (*)(void))ec_query_operation_name },
{ 0, NULL }
};
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