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openssl/providers/implementations/keymgmt/ec_kmgmt.c
Matt Caswell 2da8d4eb28 Add more complete support for libctx/propq in the EC code 
Renames some "new_ex" functions to "new_with_libctx" and ensures that we
pass around the libctx AND the propq everywhere.

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/12159)
2020-06-19 10:34:58 +01:00

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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 <openssl/core_numbers.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_OP_keymgmt_new_fn ec_newdata;
static OSSL_OP_keymgmt_gen_init_fn ec_gen_init;
static OSSL_OP_keymgmt_gen_set_template_fn ec_gen_set_template;
static OSSL_OP_keymgmt_gen_set_params_fn ec_gen_set_params;
static OSSL_OP_keymgmt_gen_settable_params_fn ec_gen_settable_params;
static OSSL_OP_keymgmt_gen_fn ec_gen;
static OSSL_OP_keymgmt_gen_cleanup_fn ec_gen_cleanup;
static OSSL_OP_keymgmt_free_fn ec_freedata;
static OSSL_OP_keymgmt_get_params_fn ec_get_params;
static OSSL_OP_keymgmt_gettable_params_fn ec_gettable_params;
static OSSL_OP_keymgmt_set_params_fn ec_set_params;
static OSSL_OP_keymgmt_settable_params_fn ec_settable_params;
static OSSL_OP_keymgmt_has_fn ec_has;
static OSSL_OP_keymgmt_match_fn ec_match;
static OSSL_OP_keymgmt_validate_fn ec_validate;
static OSSL_OP_keymgmt_import_fn ec_import;
static OSSL_OP_keymgmt_import_types_fn ec_import_types;
static OSSL_OP_keymgmt_export_fn ec_export;
static OSSL_OP_keymgmt_export_types_fn ec_export_types;
static OSSL_OP_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;
}
static ossl_inline
int domparams_to_params(const EC_KEY *ec, OSSL_PARAM_BLD *tmpl,
OSSL_PARAM params[])
{
const EC_GROUP *ecg;
int curve_nid;
if (ec == NULL)
return 0;
ecg = EC_KEY_get0_group(ec);
if (ecg == NULL)
return 0;
curve_nid = EC_GROUP_get_curve_name(ecg);
if (curve_nid == NID_undef) {
/* TODO(3.0): should we support explicit parameters curves? */
return 0;
} else {
/* named curve */
const char *curve_name = NULL;
if ((curve_name = ec_curve_nid2name(curve_nid)) == NULL)
return 0;
if (!ossl_param_build_set_utf8_string(tmpl, params,
OSSL_PKEY_PARAM_GROUP_NAME,
curve_name))
return 0;
}
return 1;
}
/*
* 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);
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, NULL) == 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, NULL);
}
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 only
* - 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 must be requested only alongside a key
*/
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;
if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
ok = ok && ec_key_domparams_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;
int ok = 1;
if (ec == NULL)
return 0;
/*
* In this implementation, we can export/import only keydata in the
* following combinations:
* - domain parameters only
* - 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 must be requested only alongside a key
*/
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)
ok = ok && domparams_to_params(ec, tmpl, NULL);
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);
return ok;
}
/* IMEXPORT = IMPORT + EXPORT */
# define EC_IMEXPORTABLE_DOM_PARAMETERS \
OSSL_PARAM_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME, 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_params(void *key, OSSL_PARAM params[])
{
int ret;
EC_KEY *eck = key;
const EC_GROUP *ecg = NULL;
OSSL_PARAM *p;
unsigned char *pub_key = NULL;
ecg = EC_KEY_get0_group(eck);
if (ecg == NULL)
return 0;
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) {
BN_CTX *ctx = BN_CTX_new_ex(ec_key_get_libctx(key));
if (ctx == NULL)
return 0;
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, ctx);
BN_CTX_free(ctx);
if (p->return_size == 0)
return 0;
}
ret = domparams_to_params(eck, NULL, params)
&& key_to_params(eck, NULL, params, 1, &pub_key)
&& otherparams_to_params(eck, NULL, params);
OPENSSL_free(pub_key);
return ret;
}
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,
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)
{
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)
{
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;
EC_GROUP *gen_group;
int selection;
int ecdh_mode;
};
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->gen_group = NULL;
gctx->selection = selection;
gctx->ecdh_mode = 0;
}
return gctx;
}
static int ec_gen_set_group(void *genctx, int nid)
{
struct ec_gen_ctx *gctx = genctx;
EC_GROUP *group;
group = EC_GROUP_new_by_curve_name_with_libctx(gctx->libctx, NULL, nid);
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_get_curve_name(ec_group));
}
static int ec_gen_set_params(void *genctx, const OSSL_PARAM params[])
{
struct ec_gen_ctx *gctx = genctx;
const OSSL_PARAM *p;
if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_USE_COFACTOR_ECDH))
!= NULL) {
if (!OSSL_PARAM_get_int(p, &gctx->ecdh_mode))
return 0;
}
if ((p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_GROUP_NAME))
!= NULL) {
const char *curve_name = NULL;
int ret = 0;
switch (p->data_type) {
case OSSL_PARAM_UTF8_STRING:
/* The OSSL_PARAM functions have no support for this */
curve_name = p->data;
ret = (curve_name != NULL);
break;
case OSSL_PARAM_UTF8_PTR:
ret = OSSL_PARAM_get_utf8_ptr(p, &curve_name);
break;
}
if (ret) {
int nid = ec_curve_name2nid(curve_name);
if (nid == NID_undef) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_CURVE);
ret = 0;
} else {
ret = ec_gen_set_group(gctx, nid);
}
}
return ret;
}
return 1;
}
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_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 = 1; /* Start optimistically */
if (gctx == NULL
|| (ec = EC_KEY_new_with_libctx(gctx->libctx, NULL)) == NULL)
return NULL;
/* 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;
/* 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);
OPENSSL_free(gctx);
}
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_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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