/* $NetBSD: crypto-ec.c,v 1.2 2017/01/28 21:31:48 christos Exp $ */
/*
* Copyright (c) 2016 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#ifdef HAVE_HCRYPTO_W_OPENSSL
#include <openssl/ec.h>
#include <openssl/ecdsa.h>
#include <openssl/rsa.h>
#include <openssl/bn.h>
#include <openssl/objects.h>
#define HEIM_NO_CRYPTO_HDRS
#endif /* HAVE_HCRYPTO_W_OPENSSL */
#include "hx_locl.h"
extern const AlgorithmIdentifier _hx509_signature_sha512_data;
extern const AlgorithmIdentifier _hx509_signature_sha384_data;
extern const AlgorithmIdentifier _hx509_signature_sha256_data;
extern const AlgorithmIdentifier _hx509_signature_sha1_data;
void
_hx509_private_eckey_free(void *eckey)
{
#ifdef HAVE_HCRYPTO_W_OPENSSL
EC_KEY_free(eckey);
#endif
}
#ifdef HAVE_HCRYPTO_W_OPENSSL
static int
heim_oid2ecnid(heim_oid *oid)
{
/*
* Now map to openssl OID fun
*/
if (der_heim_oid_cmp(oid, ASN1_OID_ID_EC_GROUP_SECP256R1) == 0)
return NID_X9_62_prime256v1;
#ifdef NID_secp521r1
else if (der_heim_oid_cmp(oid, ASN1_OID_ID_EC_GROUP_SECP521R1) == 0)
return NID_secp521r1;
#endif
#ifdef NID_secp384r1
else if (der_heim_oid_cmp(oid, ASN1_OID_ID_EC_GROUP_SECP384R1) == 0)
return NID_secp384r1;
#endif
#ifdef NID_secp160r1
else if (der_heim_oid_cmp(oid, ASN1_OID_ID_EC_GROUP_SECP160R1) == 0)
return NID_secp160r1;
#endif
#ifdef NID_secp160r2
else if (der_heim_oid_cmp(oid, ASN1_OID_ID_EC_GROUP_SECP160R2) == 0)
return NID_secp160r2;
#endif
return NID_undef;
}
static int
parse_ECParameters(hx509_context context,
heim_octet_string *parameters, int *nid)
{
ECParameters ecparam;
size_t size;
int ret;
if (parameters == NULL) {
ret = HX509_PARSING_KEY_FAILED;
hx509_set_error_string(context, 0, ret,
"EC parameters missing");
return ret;
}
ret = decode_ECParameters(parameters->data, parameters->length,
&ecparam, &size);
if (ret) {
hx509_set_error_string(context, 0, ret,
"Failed to decode EC parameters");
return ret;
}
if (ecparam.element != choice_ECParameters_namedCurve) {
free_ECParameters(&ecparam);
hx509_set_error_string(context, 0, ret,
"EC parameters is not a named curve");
return HX509_CRYPTO_SIG_INVALID_FORMAT;
}
*nid = heim_oid2ecnid(&ecparam.u.namedCurve);
free_ECParameters(&ecparam);
if (*nid == NID_undef) {
hx509_set_error_string(context, 0, ret,
"Failed to find matcing NID for EC curve");
return HX509_CRYPTO_SIG_INVALID_FORMAT;
}
return 0;
}
/*
*
*/
static int
ecdsa_verify_signature(hx509_context context,
const struct signature_alg *sig_alg,
const Certificate *signer,
const AlgorithmIdentifier *alg,
const heim_octet_string *data,
const heim_octet_string *sig)
{
const AlgorithmIdentifier *digest_alg;
const SubjectPublicKeyInfo *spi;
heim_octet_string digest;
int ret;
EC_KEY *key = NULL;
int groupnid;
EC_GROUP *group;
const unsigned char *p;
long len;
digest_alg = sig_alg->digest_alg;
ret = _hx509_create_signature(context,
NULL,
digest_alg,
data,
NULL,
&digest);
if (ret)
return ret;
/* set up EC KEY */
spi = &signer->tbsCertificate.subjectPublicKeyInfo;
if (der_heim_oid_cmp(&spi->algorithm.algorithm, ASN1_OID_ID_ECPUBLICKEY) != 0)
return HX509_CRYPTO_SIG_INVALID_FORMAT;
/*
* Find the group id
*/
ret = parse_ECParameters(context, spi->algorithm.parameters, &groupnid);
if (ret) {
der_free_octet_string(&digest);
return ret;
}
/*
* Create group, key, parse key
*/
key = EC_KEY_new();
group = EC_GROUP_new_by_curve_name(groupnid);
EC_KEY_set_group(key, group);
EC_GROUP_free(group);
p = spi->subjectPublicKey.data;
len = spi->subjectPublicKey.length / 8;
if (o2i_ECPublicKey(&key, &p, len) == NULL) {
EC_KEY_free(key);
return HX509_CRYPTO_SIG_INVALID_FORMAT;
}
ret = ECDSA_verify(-1, digest.data, digest.length,
sig->data, sig->length, key);
der_free_octet_string(&digest);
EC_KEY_free(key);
if (ret != 1) {
ret = HX509_CRYPTO_SIG_INVALID_FORMAT;
return ret;
}
return 0;
}
static int
ecdsa_create_signature(hx509_context context,
const struct signature_alg *sig_alg,
const hx509_private_key signer,
const AlgorithmIdentifier *alg,
const heim_octet_string *data,
AlgorithmIdentifier *signatureAlgorithm,
heim_octet_string *sig)
{
const AlgorithmIdentifier *digest_alg;
heim_octet_string indata;
const heim_oid *sig_oid;
unsigned int siglen;
int ret;
if (signer->ops && der_heim_oid_cmp(signer->ops->key_oid, ASN1_OID_ID_ECPUBLICKEY) != 0)
_hx509_abort("internal error passing private key to wrong ops");
sig_oid = sig_alg->sig_oid;
digest_alg = sig_alg->digest_alg;
if (signatureAlgorithm) {
ret = _hx509_set_digest_alg(signatureAlgorithm, sig_oid,
"\x05\x00", 2);
if (ret) {
hx509_clear_error_string(context);
return ret;
}
}
ret = _hx509_create_signature(context,
NULL,
digest_alg,
data,
NULL,
&indata);
if (ret)
goto error;
sig->length = ECDSA_size(signer->private_key.ecdsa);
sig->data = malloc(sig->length);
if (sig->data == NULL) {
der_free_octet_string(&indata);
ret = ENOMEM;
hx509_set_error_string(context, 0, ret, "out of memory");
goto error;
}
siglen = sig->length;
ret = ECDSA_sign(-1, indata.data, indata.length,
sig->data, &siglen, signer->private_key.ecdsa);
der_free_octet_string(&indata);
if (ret != 1) {
ret = HX509_CMS_FAILED_CREATE_SIGATURE;
hx509_set_error_string(context, 0, ret,
"ECDSA sign failed: %d", ret);
goto error;
}
if (siglen > sig->length)
_hx509_abort("ECDSA signature prelen longer the output len");
sig->length = siglen;
return 0;
error:
if (signatureAlgorithm)
free_AlgorithmIdentifier(signatureAlgorithm);
return ret;
}
static int
ecdsa_available(const hx509_private_key signer,
const AlgorithmIdentifier *sig_alg)
{
const struct signature_alg *sig;
const EC_GROUP *group;
BN_CTX *bnctx = NULL;
BIGNUM *order = NULL;
int ret = 0;
if (der_heim_oid_cmp(signer->ops->key_oid, &asn1_oid_id_ecPublicKey) != 0)
_hx509_abort("internal error passing private key to wrong ops");
sig = _hx509_find_sig_alg(&sig_alg->algorithm);
if (sig == NULL || sig->digest_size == 0)
return 0;
group = EC_KEY_get0_group(signer->private_key.ecdsa);
if (group == NULL)
return 0;
bnctx = BN_CTX_new();
order = BN_new();
if (order == NULL)
goto err;
if (EC_GROUP_get_order(group, order, bnctx) != 1)
goto err;
#if 0
/* If anything, require a digest at least as wide as the EC key size */
if (BN_num_bytes(order) > sig->digest_size)
#endif
ret = 1;
err:
if (bnctx)
BN_CTX_free(bnctx);
if (order)
BN_clear_free(order);
return ret;
}
static int
ecdsa_private_key2SPKI(hx509_context context,
hx509_private_key private_key,
SubjectPublicKeyInfo *spki)
{
memset(spki, 0, sizeof(*spki));
return ENOMEM;
}
static int
ecdsa_private_key_export(hx509_context context,
const hx509_private_key key,
hx509_key_format_t format,
heim_octet_string *data)
{
return HX509_CRYPTO_KEY_FORMAT_UNSUPPORTED;
}
static int
ecdsa_private_key_import(hx509_context context,
const AlgorithmIdentifier *keyai,
const void *data,
size_t len,
hx509_key_format_t format,
hx509_private_key private_key)
{
const unsigned char *p = data;
EC_KEY **pkey = NULL;
EC_KEY *key;
if (keyai->parameters) {
EC_GROUP *group;
int groupnid;
int ret;
ret = parse_ECParameters(context, keyai->parameters, &groupnid);
if (ret)
return ret;
key = EC_KEY_new();
if (key == NULL)
return ENOMEM;
group = EC_GROUP_new_by_curve_name(groupnid);
if (group == NULL) {
EC_KEY_free(key);
return ENOMEM;
}
EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
if (EC_KEY_set_group(key, group) == 0) {
EC_KEY_free(key);
EC_GROUP_free(group);
return ENOMEM;
}
EC_GROUP_free(group);
pkey = &key;
}
switch (format) {
case HX509_KEY_FORMAT_DER:
private_key->private_key.ecdsa = d2i_ECPrivateKey(pkey, &p, len);
if (private_key->private_key.ecdsa == NULL) {
hx509_set_error_string(context, 0, HX509_PARSING_KEY_FAILED,
"Failed to parse EC private key");
return HX509_PARSING_KEY_FAILED;
}
private_key->signature_alg = ASN1_OID_ID_ECDSA_WITH_SHA256;
break;
default:
return HX509_CRYPTO_KEY_FORMAT_UNSUPPORTED;
}
return 0;
}
static int
ecdsa_generate_private_key(hx509_context context,
struct hx509_generate_private_context *ctx,
hx509_private_key private_key)
{
return ENOMEM;
}
static BIGNUM *
ecdsa_get_internal(hx509_context context,
hx509_private_key key,
const char *type)
{
return NULL;
}
static const unsigned ecPublicKey[] ={ 1, 2, 840, 10045, 2, 1 };
const AlgorithmIdentifier _hx509_signature_ecPublicKey = {
{ 6, rk_UNCONST(ecPublicKey) }, NULL
};
static const unsigned ecdsa_with_sha256_oid[] ={ 1, 2, 840, 10045, 4, 3, 2 };
const AlgorithmIdentifier _hx509_signature_ecdsa_with_sha256_data = {
{ 7, rk_UNCONST(ecdsa_with_sha256_oid) }, NULL
};
static const unsigned ecdsa_with_sha384_oid[] ={ 1, 2, 840, 10045, 4, 3, 3 };
const AlgorithmIdentifier _hx509_signature_ecdsa_with_sha384_data = {
{ 7, rk_UNCONST(ecdsa_with_sha384_oid) }, NULL
};
static const unsigned ecdsa_with_sha512_oid[] ={ 1, 2, 840, 10045, 4, 3, 4 };
const AlgorithmIdentifier _hx509_signature_ecdsa_with_sha512_data = {
{ 7, rk_UNCONST(ecdsa_with_sha512_oid) }, NULL
};
static const unsigned ecdsa_with_sha1_oid[] ={ 1, 2, 840, 10045, 4, 1 };
const AlgorithmIdentifier _hx509_signature_ecdsa_with_sha1_data = {
{ 6, rk_UNCONST(ecdsa_with_sha1_oid) }, NULL
};
hx509_private_key_ops ecdsa_private_key_ops = {
"EC PRIVATE KEY",
ASN1_OID_ID_ECPUBLICKEY,
ecdsa_available,
ecdsa_private_key2SPKI,
ecdsa_private_key_export,
ecdsa_private_key_import,
ecdsa_generate_private_key,
ecdsa_get_internal
};
const struct signature_alg ecdsa_with_sha512_alg = {
"ecdsa-with-sha512",
ASN1_OID_ID_ECDSA_WITH_SHA512,
&_hx509_signature_ecdsa_with_sha512_data,
ASN1_OID_ID_ECPUBLICKEY,
&_hx509_signature_sha512_data,
PROVIDE_CONF|REQUIRE_SIGNER|RA_RSA_USES_DIGEST_INFO|
SIG_PUBLIC_SIG|SELF_SIGNED_OK,
0,
NULL,
ecdsa_verify_signature,
ecdsa_create_signature,
64
};
const struct signature_alg ecdsa_with_sha384_alg = {
"ecdsa-with-sha384",
ASN1_OID_ID_ECDSA_WITH_SHA384,
&_hx509_signature_ecdsa_with_sha384_data,
ASN1_OID_ID_ECPUBLICKEY,
&_hx509_signature_sha384_data,
PROVIDE_CONF|REQUIRE_SIGNER|RA_RSA_USES_DIGEST_INFO|
SIG_PUBLIC_SIG|SELF_SIGNED_OK,
0,
NULL,
ecdsa_verify_signature,
ecdsa_create_signature,
48
};
const struct signature_alg ecdsa_with_sha256_alg = {
"ecdsa-with-sha256",
ASN1_OID_ID_ECDSA_WITH_SHA256,
&_hx509_signature_ecdsa_with_sha256_data,
ASN1_OID_ID_ECPUBLICKEY,
&_hx509_signature_sha256_data,
PROVIDE_CONF|REQUIRE_SIGNER|RA_RSA_USES_DIGEST_INFO|
SIG_PUBLIC_SIG|SELF_SIGNED_OK,
0,
NULL,
ecdsa_verify_signature,
ecdsa_create_signature,
32
};
const struct signature_alg ecdsa_with_sha1_alg = {
"ecdsa-with-sha1",
ASN1_OID_ID_ECDSA_WITH_SHA1,
&_hx509_signature_ecdsa_with_sha1_data,
ASN1_OID_ID_ECPUBLICKEY,
&_hx509_signature_sha1_data,
PROVIDE_CONF|REQUIRE_SIGNER|RA_RSA_USES_DIGEST_INFO|
SIG_PUBLIC_SIG|SELF_SIGNED_OK,
0,
NULL,
ecdsa_verify_signature,
ecdsa_create_signature,
20
};
#endif /* HAVE_HCRYPTO_W_OPENSSL */
const AlgorithmIdentifier *
hx509_signature_ecPublicKey(void)
{
#ifdef HAVE_HCRYPTO_W_OPENSSL
return &_hx509_signature_ecPublicKey;
#else
return NULL;
#endif /* HAVE_HCRYPTO_W_OPENSSL */
}
const AlgorithmIdentifier *
hx509_signature_ecdsa_with_sha256(void)
{
#ifdef HAVE_HCRYPTO_W_OPENSSL
return &_hx509_signature_ecdsa_with_sha256_data;
#else
return NULL;
#endif /* HAVE_HCRYPTO_W_OPENSSL */
}