/* libp11, a simple layer on to of PKCS#11 API
* Copyright (C) 2005 Olaf Kirch <okir@lst.de>
* Copyright (C) 2011, 2013 Douglas E. Engert <deengert@anl.gov>
* Copyright (C) 2014, 2016 Douglas E. Engert <deengert@gmail.com>
* Copyright (C) 2016-2018 Michał Trojnara <Michal.Trojnara@stunnel.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* This file implements the handling of EC keys stored on a
* PKCS11 token
*/
#include "libp11-int.h"
#include <string.h>
#ifndef OPENSSL_NO_EC
#include <openssl/ec.h>
#include <openssl/bn.h>
#endif
#ifndef OPENSSL_NO_ECDSA
#include <openssl/ecdsa.h>
#endif
#ifndef OPENSSL_NO_ECDH
#include <openssl/ecdh.h>
#endif
#ifndef OPENSSL_NO_EC
#if OPENSSL_VERSION_NUMBER >= 0x10100004L && !defined(LIBRESSL_VERSION_NUMBER)
typedef int (*compute_key_fn)(unsigned char **, size_t *,
const EC_POINT *, const EC_KEY *);
#else
typedef int (*compute_key_fn)(void *, size_t,
const EC_POINT *, const EC_KEY *,
void *(*)(const void *, size_t, void *, size_t *));
#endif
static compute_key_fn ossl_ecdh_compute_key;
static int ec_ex_index = 0;
/********** Missing ECDSA_METHOD functions for OpenSSL < 1.1.0 */
typedef ECDSA_SIG *(*sign_sig_fn)(const unsigned char *, int,
const BIGNUM *, const BIGNUM *, EC_KEY *);
#if OPENSSL_VERSION_NUMBER < 0x10100000L
/* ecdsa_method maintains unchanged layout between 0.9.8 and 1.0.2 */
/* Data pointers and function pointers may have different sizes on some
* architectures */
struct ecdsa_method {
char *name;
sign_sig_fn ecdsa_do_sign;
void (*ecdsa_sign_setup)();
void (*ecdsa_do_verify)();
int flags;
char *app_data;
};
#endif /* OPENSSL_VERSION_NUMBER < 0x10100000L */
#if OPENSSL_VERSION_NUMBER < 0x10002000L || defined(LIBRESSL_VERSION_NUMBER)
/* Define missing functions */
ECDSA_METHOD *ECDSA_METHOD_new(const ECDSA_METHOD *m)
{
ECDSA_METHOD *out;
out = OPENSSL_malloc(sizeof(ECDSA_METHOD));
if (out == NULL)
return NULL;
if (m)
memcpy(out, m, sizeof(ECDSA_METHOD));
else
memset(out, 0, sizeof(ECDSA_METHOD));
return out;
}
void ECDSA_METHOD_free(ECDSA_METHOD *m)
{
OPENSSL_free(m);
}
void ECDSA_METHOD_set_sign(ECDSA_METHOD *m, sign_sig_fn f)
{
m->ecdsa_do_sign = f;
}
#endif /* OPENSSL_VERSION_NUMBER < 0x10002000L */
/********** Missing ECDH_METHOD functions for OpenSSL < 1.1.0 */
#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
/* ecdh_method maintains unchanged layout between 0.9.8 and 1.0.2 */
/* Data pointers and function pointers may have different sizes on some
* architectures */
struct ecdh_method {
char *name;
compute_key_fn compute_key;
int flags;
char *data;
};
/* Define missing functions */
ECDH_METHOD *ECDH_METHOD_new(const ECDH_METHOD *m)
{
ECDH_METHOD *out;
out = OPENSSL_malloc(sizeof(ECDH_METHOD));
if (out == NULL)
return NULL;
if (m)
memcpy(out, m, sizeof(ECDH_METHOD));
else
memset(out, 0, sizeof(ECDH_METHOD));
return out;
}
void ECDH_METHOD_free(ECDH_METHOD *m)
{
OPENSSL_free(m);
}
void ECDH_METHOD_get_compute_key(ECDH_METHOD *m, compute_key_fn *f)
{
*f = m->compute_key;
}
void ECDH_METHOD_set_compute_key(ECDH_METHOD *m, compute_key_fn f)
{
m->compute_key = f;
}
#endif /* OPENSSL_VERSION_NUMBER < 0x10100000L */
/********** Manage EC ex_data */
/* NOTE: ECDH also uses ECDSA ex_data and *not* ECDH ex_data */
static void alloc_ec_ex_index()
{
if (ec_ex_index == 0) {
while (ec_ex_index == 0) /* Workaround for OpenSSL RT3710 */
#if OPENSSL_VERSION_NUMBER >= 0x10100002L && !defined(LIBRESSL_VERSION_NUMBER)
ec_ex_index = EC_KEY_get_ex_new_index(0, "libp11 ec_key",
NULL, NULL, NULL);
#else
ec_ex_index = ECDSA_get_ex_new_index(0, "libp11 ecdsa",
NULL, NULL, NULL);
#endif
if (ec_ex_index < 0)
ec_ex_index = 0; /* Fallback to app_data */
}
}
#if 0
/* TODO: Free the indexes on unload */
static void free_ec_ex_index()
{
if (ec_ex_index > 0) {
#if OPENSSL_VERSION_NUMBER >= 0x10100002L
/* CRYPTO_free_ex_index requires OpenSSL version >= 1.1.0-pre1 */
CRYPTO_free_ex_index(CRYPTO_EX_INDEX_EC_KEY, ec_ex_index);
#endif
ec_ex_index = 0;
}
}
#endif
/********** EVP_PKEY retrieval */
/* Retrieve EC parameters from key into ec
* return nonzero on error */
static int pkcs11_get_params(EC_KEY *ec, PKCS11_KEY *key)
{
CK_BYTE *params;
size_t params_len = 0;
const unsigned char *a;
int rv;
if (key_getattr_alloc(key, CKA_EC_PARAMS, ¶ms, ¶ms_len))
return -1;
a = params;
rv = d2i_ECParameters(&ec, &a, (long)params_len) == NULL;
OPENSSL_free(params);
return rv;
}
/* Retrieve EC point from key into ec
* return nonzero on error */
static int pkcs11_get_point_key(EC_KEY *ec, PKCS11_KEY *key)
{
CK_BYTE *point;
size_t point_len = 0;
const unsigned char *a;
ASN1_OCTET_STRING *os;
int rv = -1;
if (key == NULL ||
key_getattr_alloc(key, CKA_EC_POINT, &point, &point_len))
return -1;
/* PKCS#11-compliant modules should return ASN1_OCTET_STRING */
a = point;
os = d2i_ASN1_OCTET_STRING(NULL, &a, (long)point_len);
if (os) {
a = os->data;
rv = o2i_ECPublicKey(&ec, &a, os->length) == NULL;
ASN1_STRING_free(os);
}
if (rv) { /* Workaround for broken PKCS#11 modules */
a = point;
rv = o2i_ECPublicKey(&ec, &a, (long)point_len) == NULL;
}
OPENSSL_free(point);
return rv;
}
/* Retrieve EC point from cert into ec
* return nonzero on error */
static int pkcs11_get_point_cert(EC_KEY *ec, PKCS11_CERT *cert)
{
EVP_PKEY *pubkey = NULL;
EC_KEY *pubkey_ec;
const EC_POINT *point;
int rv = -1;
if (cert == NULL)
goto error;
#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
pubkey = X509_get0_pubkey(cert->x509);
#else
pubkey = X509_get_pubkey(cert->x509);
#endif
if (pubkey == NULL)
goto error;
pubkey_ec = EVP_PKEY_get0_EC_KEY(pubkey);
if (pubkey_ec == NULL)
goto error;
point = EC_KEY_get0_public_key(pubkey_ec);
if (point == NULL)
goto error;
if (EC_KEY_set_public_key(ec, point) == 0)
goto error;
rv = 0;
error:
#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
EVP_PKEY_free(pubkey);
#endif
return rv;
}
static EC_KEY *pkcs11_get_ec(PKCS11_KEY *key)
{
EC_KEY *ec;
int no_params, no_point;
ec = EC_KEY_new();
if (ec == NULL)
return NULL;
/* For OpenSSL req we need at least the
* EC_KEY_get0_group(ec_key)) to return the group.
* Continue even if it fails, as the sign operation does not need
* it if the PKCS#11 module or the hardware can figure this out
*/
no_params = pkcs11_get_params(ec, key);
no_point = pkcs11_get_point_key(ec, key);
if (no_point && key->isPrivate) /* Retry with the public key */
no_point = pkcs11_get_point_key(ec, pkcs11_find_key_from_key(key));
if (no_point && key->isPrivate) /* Retry with the certificate */
no_point = pkcs11_get_point_cert(ec, pkcs11_find_certificate(key));
if (key->isPrivate && EC_KEY_get0_private_key(ec) == NULL) {
BIGNUM *bn = BN_new();
EC_KEY_set_private_key(ec, bn);
BN_free(bn);
}
/* A public keys requires both the params and the point to be present */
if (!key->isPrivate && (no_params || no_point)) {
EC_KEY_free(ec);
return NULL;
}
return ec;
}
PKCS11_KEY *pkcs11_get_ex_data_ec(const EC_KEY *ec)
{
#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
return EC_KEY_get_ex_data(ec, ec_ex_index);
#else
return ECDSA_get_ex_data((EC_KEY *)ec, ec_ex_index);
#endif
}
static void pkcs11_set_ex_data_ec(EC_KEY *ec, PKCS11_KEY *key)
{
#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
EC_KEY_set_ex_data(ec, ec_ex_index, key);
#else
ECDSA_set_ex_data(ec, ec_ex_index, key);
#endif
}
static void pkcs11_update_ex_data_ec(PKCS11_KEY *key)
{
EVP_PKEY *evp = key->evp_key;
EC_KEY *ec;
if (evp == NULL)
return;
if (EVP_PKEY_base_id(evp) != EVP_PKEY_EC)
return;
ec = EVP_PKEY_get1_EC_KEY(evp);
pkcs11_set_ex_data_ec(ec, key);
EC_KEY_free(ec);
}
/*
* Get EC key material and stash pointer in ex_data
* Note we get called twice, once for private key, and once for public
* We need to get the EC_PARAMS and EC_POINT into both,
* as lib11 dates from RSA only where all the pub key components
* were also part of the private key. With EC the point
* is not in the private key, and the params may or may not be.
*
*/
static EVP_PKEY *pkcs11_get_evp_key_ec(PKCS11_KEY *key)
{
EVP_PKEY *pk;
EC_KEY *ec;
ec = pkcs11_get_ec(key);
if (ec == NULL)
return NULL;
pk = EVP_PKEY_new();
if (pk == NULL) {
EC_KEY_free(ec);
return NULL;
}
EVP_PKEY_set1_EC_KEY(pk, ec); /* Also increments the ec ref count */
if (key->isPrivate) {
#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
EC_KEY_set_method(ec, PKCS11_get_ec_key_method());
#else
ECDSA_set_method(ec, PKCS11_get_ecdsa_method());
ECDH_set_method(ec, PKCS11_get_ecdh_method());
#endif
}
/* TODO: Retrieve the ECDSA private key object attributes instead,
* unless the key has the "sensitive" attribute set */
pkcs11_set_ex_data_ec(ec, key);
EC_KEY_free(ec); /* Drops our reference to it */
return pk;
}
/********** ECDSA signing */
/* Signature size is the issue, will assume the caller has a big buffer! */
/* No padding or other stuff needed. We can call PKCS11 from here */
static int pkcs11_ecdsa_sign(const unsigned char *msg, unsigned int msg_len,
unsigned char *sigret, unsigned int *siglen, PKCS11_KEY *key)
{
int rv;
PKCS11_SLOT *slot = KEY2SLOT(key);
PKCS11_CTX *ctx = KEY2CTX(key);
PKCS11_KEY_private *kpriv = PRIVKEY(key);
PKCS11_SLOT_private *spriv = PRIVSLOT(slot);
CK_MECHANISM mechanism;
CK_ULONG ck_sigsize;
ck_sigsize = *siglen;
memset(&mechanism, 0, sizeof(mechanism));
mechanism.mechanism = CKM_ECDSA;
CRYPTO_THREAD_write_lock(PRIVCTX(ctx)->rwlock);
rv = CRYPTOKI_call(ctx,
C_SignInit(spriv->session, &mechanism, kpriv->object));
if (!rv && kpriv->always_authenticate == CK_TRUE)
rv = pkcs11_authenticate(key);
if (!rv)
rv = CRYPTOKI_call(ctx,
C_Sign(spriv->session, (CK_BYTE *)msg, msg_len, sigret, &ck_sigsize));
CRYPTO_THREAD_unlock(PRIVCTX(ctx)->rwlock);
if (rv) {
CKRerr(CKR_F_PKCS11_ECDSA_SIGN, rv);
return -1;
}
*siglen = ck_sigsize;
return ck_sigsize;
}
/**
* ECDSA signing method (replaces ossl_ecdsa_sign_sig)
*
* @param dgst hash value to sign
* @param dlen length of the hash value
* @param kinv precomputed inverse k (from the sign_setup method)
* @param rp precomputed rp (from the sign_setup method)
* @param ec private EC signing key
* @return pointer to a ECDSA_SIG structure or NULL if an error occurred
*/
static ECDSA_SIG *pkcs11_ecdsa_sign_sig(const unsigned char *dgst, int dlen,
const BIGNUM *kinv, const BIGNUM *rp, EC_KEY *ec)
{
unsigned char sigret[512]; /* HACK for now */
ECDSA_SIG *sig;
PKCS11_KEY *key;
unsigned int siglen;
BIGNUM *r, *s, *order;
(void)kinv; /* Precomputed values are not used for PKCS#11 */
(void)rp; /* Precomputed values are not used for PKCS#11 */
key = pkcs11_get_ex_data_ec(ec);
if (check_key_fork(key) < 0) {
sign_sig_fn orig_sign_sig;
#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
const EC_KEY_METHOD *meth = EC_KEY_OpenSSL();
EC_KEY_METHOD_get_sign((EC_KEY_METHOD *)meth,
NULL, NULL, &orig_sign_sig);
#else
const ECDSA_METHOD *meth = ECDSA_OpenSSL();
orig_sign_sig = meth->ecdsa_do_sign;
#endif
return orig_sign_sig(dgst, dlen, kinv, rp, ec);
}
/* Truncate digest if its byte size is longer than needed */
order = BN_new();
if (order) {
const EC_GROUP *group = EC_KEY_get0_group(ec);
if (group && EC_GROUP_get_order(group, order, NULL)) {
int klen = BN_num_bits(order);
if (klen < 8*dlen)
dlen = (klen+7)/8;
}
BN_free(order);
}
siglen = sizeof sigret;
if (pkcs11_ecdsa_sign(dgst, dlen, sigret, &siglen, key) <= 0)
return NULL;
r = BN_bin2bn(sigret, siglen/2, NULL);
s = BN_bin2bn(sigret + siglen/2, siglen/2, NULL);
sig = ECDSA_SIG_new();
if (sig == NULL)
return NULL;
#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
ECDSA_SIG_set0(sig, r, s);
#else
BN_free(sig->r);
sig->r = r;
BN_free(sig->s);
sig->s = s;
#endif
return sig;
}
/********** ECDH key derivation */
static CK_ECDH1_DERIVE_PARAMS *pkcs11_ecdh_params_alloc(
const EC_GROUP *group, const EC_POINT *point)
{
CK_ECDH1_DERIVE_PARAMS *parms;
size_t len;
unsigned char *buf = NULL;
if (group == NULL || point == NULL)
return NULL;
len = EC_POINT_point2oct(group, point,
POINT_CONVERSION_UNCOMPRESSED, NULL, 0, NULL);
if (len == 0)
return NULL;
buf = OPENSSL_malloc(len);
if (buf == NULL)
return NULL;
len = EC_POINT_point2oct(group, point,
POINT_CONVERSION_UNCOMPRESSED, buf, len, NULL);
if (len == 0) {
OPENSSL_free(buf);
return NULL;
}
parms = OPENSSL_malloc(sizeof(CK_ECDH1_DERIVE_PARAMS));
if (parms == NULL) {
OPENSSL_free(buf);
return NULL;
}
parms->kdf = CKD_NULL;
parms->pSharedData = NULL;
parms->ulSharedDataLen = 0;
parms->pPublicData = buf;
parms->ulPublicDataLen = len;
return parms;
}
static void pkcs11_ecdh_params_free(CK_ECDH1_DERIVE_PARAMS *parms)
{
OPENSSL_free(parms->pPublicData);
OPENSSL_free(parms);
}
/* initial code will only support what is needed for pkcs11_ec_ckey
* i.e. CKM_ECDH1_DERIVE, CKM_ECDH1_COFACTOR_DERIVE
* and CK_EC_KDF_TYPE supported by token
* The secret key object is deleted
*
* In future CKM_ECMQV_DERIVE with CK_ECMQV_DERIVE_PARAMS
* could also be supported, and the secret key object could be returned.
*/
static int pkcs11_ecdh_derive(unsigned char **out, size_t *outlen,
const unsigned long ecdh_mechanism,
const void *ec_params,
void *outnewkey,
PKCS11_KEY *key)
{
PKCS11_SLOT *slot = KEY2SLOT(key);
PKCS11_CTX *ctx = KEY2CTX(key);
PKCS11_TOKEN *token = KEY2TOKEN(key);
PKCS11_KEY_private *kpriv = PRIVKEY(key);
PKCS11_SLOT_private *spriv = PRIVSLOT(slot);
CK_MECHANISM mechanism;
int rv;
CK_BBOOL true = TRUE;
CK_BBOOL false = FALSE;
CK_OBJECT_HANDLE newkey = CK_INVALID_HANDLE;
CK_OBJECT_CLASS newkey_class= CKO_SECRET_KEY;
CK_KEY_TYPE newkey_type = CKK_GENERIC_SECRET;
CK_OBJECT_HANDLE *tmpnewkey = (CK_OBJECT_HANDLE *)outnewkey;
CK_ATTRIBUTE newkey_template[] = {
{CKA_TOKEN, &false, sizeof(false)}, /* session only object */
{CKA_CLASS, &newkey_class, sizeof(newkey_class)},
{CKA_KEY_TYPE, &newkey_type, sizeof(newkey_type)},
{CKA_ENCRYPT, &true, sizeof(true)},
{CKA_DECRYPT, &true, sizeof(true)}
};
memset(&mechanism, 0, sizeof(mechanism));
mechanism.mechanism = ecdh_mechanism;
mechanism.pParameter = (void*)ec_params;
switch (ecdh_mechanism) {
case CKM_ECDH1_DERIVE:
case CKM_ECDH1_COFACTOR_DERIVE:
mechanism.ulParameterLen = sizeof(CK_ECDH1_DERIVE_PARAMS);
break;
#if 0
/* TODO */
case CK_ECMQV_DERIVE_PARAMS:
mechanism.ulParameterLen = sizeof(CK_ECMQV_DERIVE_PARAMS);
break;
#endif
default:
P11err(P11_F_PKCS11_ECDH_DERIVE, P11_R_NOT_SUPPORTED);
return -1;
}
rv = CRYPTOKI_call(ctx, C_DeriveKey(spriv->session, &mechanism, kpriv->object, newkey_template, 5, &newkey));
CRYPTOKI_checkerr(CKR_F_PKCS11_ECDH_DERIVE, rv);
/* Return the value of the secret key and/or the object handle of the secret key */
if (out && outlen) { /* pkcs11_ec_ckey only asks for the value */
if (pkcs11_getattr_alloc(token, newkey, CKA_VALUE, out, outlen)) {
CKRerr(CKR_F_PKCS11_ECDH_DERIVE, CKR_ATTRIBUTE_VALUE_INVALID);
CRYPTOKI_call(ctx, C_DestroyObject(spriv->session, newkey));
return -1;
}
}
if (tmpnewkey) /* For future use (not used by pkcs11_ec_ckey) */
*tmpnewkey = newkey;
else /* Destroy the temporary key */
CRYPTOKI_call(ctx, C_DestroyObject(spriv->session, newkey));
return 0;
}
#if OPENSSL_VERSION_NUMBER >= 0x10100004L && !defined(LIBRESSL_VERSION_NUMBER)
/**
* ECDH key derivation method (replaces ossl_ecdh_compute_key)
* Implementation for OpenSSL 1.1.0-pre4 and later
*
* @param out derived key
* @param outlen derived key length
* @param peer_point public key point
* @param ecdh private key
* @return 1 on success or 0 on error
*/
static int pkcs11_ec_ckey(unsigned char **out, size_t *outlen,
const EC_POINT *peer_point, const EC_KEY *ecdh)
{
PKCS11_KEY *key;
CK_ECDH1_DERIVE_PARAMS *parms;
unsigned char *buf = NULL;
size_t buflen;
int rv;
key = pkcs11_get_ex_data_ec(ecdh);
if (check_key_fork(key) < 0)
return ossl_ecdh_compute_key(out, outlen, peer_point, ecdh);
/* both peer and ecdh use same group parameters */
parms = pkcs11_ecdh_params_alloc(EC_KEY_get0_group(ecdh), peer_point);
if (parms == NULL)
return 0;
rv = pkcs11_ecdh_derive(&buf, &buflen, CKM_ECDH1_DERIVE, parms, NULL, key);
pkcs11_ecdh_params_free(parms);
if (rv < 0)
return 0;
*out = buf;
*outlen = buflen;
return 1;
}
#else
/**
* ECDH key derivation method (replaces ossl_ecdh_compute_key)
* Implementation for OpenSSL 1.1.0-pre3 and earlier
*
* @param out derived key
* @param outlen derived key length
* @param peer_point public key point
* @param ecdh private key
* @param KCF key derivation function
* @return the length of the derived key or -1 if an error occurred
*/
static int pkcs11_ec_ckey(void *out, size_t outlen,
const EC_POINT *peer_point, const EC_KEY *ecdh,
void *(*KDF)(const void *, size_t, void *, size_t *))
{
PKCS11_KEY *key;
CK_ECDH1_DERIVE_PARAMS *parms;
unsigned char *buf = NULL;
size_t buflen;
int rv;
key = pkcs11_get_ex_data_ec(ecdh);
if (check_key_fork(key) < 0)
return ossl_ecdh_compute_key(out, outlen, peer_point, ecdh, KDF);
/* both peer and ecdh use same group parameters */
parms = pkcs11_ecdh_params_alloc(EC_KEY_get0_group(ecdh), peer_point);
if (parms == NULL)
return -1;
rv = pkcs11_ecdh_derive(&buf, &buflen, CKM_ECDH1_DERIVE, parms, NULL, key);
pkcs11_ecdh_params_free(parms);
if (rv < 0)
return -1;
if (KDF) {
if (KDF(buf, buflen, out, &outlen) == NULL) {
OPENSSL_free(buf);
return -1;
}
} else {
if (outlen > buflen)
outlen = buflen;
memcpy(out, buf, outlen);
}
OPENSSL_free(buf);
return outlen;
}
#endif
/********** Set OpenSSL EC methods */
/*
* Overload the default OpenSSL methods for ECDSA
* If OpenSSL supports ECDSA_METHOD_new we will use it.
* First introduced in 1.0.2, changed in 1.1-pre
*/
/* New way to allocate an ECDSA_METOD object */
/* OpenSSL 1.1 has single method EC_KEY_METHOD for ECDSA and ECDH */
#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
EC_KEY_METHOD *PKCS11_get_ec_key_method(void)
{
static EC_KEY_METHOD *ops = NULL;
int (*orig_sign)(int, const unsigned char *, int, unsigned char *,
unsigned int *, const BIGNUM *, const BIGNUM *, EC_KEY *) = NULL;
alloc_ec_ex_index();
if (ops == NULL) {
ops = EC_KEY_METHOD_new((EC_KEY_METHOD *)EC_KEY_OpenSSL());
EC_KEY_METHOD_get_sign(ops, &orig_sign, NULL, NULL);
EC_KEY_METHOD_set_sign(ops, orig_sign, NULL, pkcs11_ecdsa_sign_sig);
EC_KEY_METHOD_get_compute_key(ops, &ossl_ecdh_compute_key);
EC_KEY_METHOD_set_compute_key(ops, pkcs11_ec_ckey);
}
return ops;
}
/* define old way to keep old engines working without ECDSA */
void *PKCS11_get_ecdsa_method(void)
{
return NULL;
}
void *PKCS11_get_ecdh_method(void)
{
return NULL;
}
#else /* OPENSSL_VERSION_NUMBER */
/* define new way to keep new engines from crashing with older libp11 */
void *PKCS11_get_ec_key_method(void)
{
return NULL;
}
ECDSA_METHOD *PKCS11_get_ecdsa_method(void)
{
static ECDSA_METHOD *ops = NULL;
if (ops == NULL) {
alloc_ec_ex_index();
ops = ECDSA_METHOD_new((ECDSA_METHOD *)ECDSA_OpenSSL());
ECDSA_METHOD_set_sign(ops, pkcs11_ecdsa_sign_sig);
}
return ops;
}
ECDH_METHOD *PKCS11_get_ecdh_method(void)
{
static ECDH_METHOD *ops = NULL;
if (ops == NULL) {
alloc_ec_ex_index();
ops = ECDH_METHOD_new((ECDH_METHOD *)ECDH_OpenSSL());
ECDH_METHOD_get_compute_key(ops, &ossl_ecdh_compute_key);
ECDH_METHOD_set_compute_key(ops, pkcs11_ec_ckey);
}
return ops;
}
#endif /* OPENSSL_VERSION_NUMBER */
PKCS11_KEY_ops pkcs11_ec_ops_s = {
EVP_PKEY_EC,
pkcs11_get_evp_key_ec,
pkcs11_update_ex_data_ec,
};
PKCS11_KEY_ops *pkcs11_ec_ops = {&pkcs11_ec_ops_s};
#else /* OPENSSL_NO_EC */
PKCS11_KEY_ops *pkcs11_ec_ops = {NULL};
/* if not built with EC or OpenSSL does not support ECDSA
* add these routines so engine_pkcs11 can be built now and not
* require further changes */
#warning "ECDSA support not built with libp11"
ECDSA_METHOD *PKCS11_get_ecdsa_method(void)
{
return NULL;
}
#endif /* OPENSSL_NO_EC */
/* TODO: remove this function in libp11 0.5.0 */
void PKCS11_ecdsa_method_free(void)
{
/* no op */
}
/* vim: set noexpandtab: */