blob: 3038b9eae805041b96ea06b20a68854b0ce09130 [file] [log] [blame]
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project 2006.
*/
/* ====================================================================
* Copyright (c) 2006 The OpenSSL Project. 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. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED 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 OpenSSL PROJECT OR
* ITS 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.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com). */
#include <openssl/evp.h>
#include <openssl/asn1t.h>
#include <openssl/bn.h>
#include <openssl/ec.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include <openssl/obj.h>
#include <openssl/x509.h>
#include "internal.h"
static int eckey_param2type(int *pptype, void **ppval, EC_KEY *ec_key) {
const EC_GROUP *group;
int nid;
if (ec_key == NULL || (group = EC_KEY_get0_group(ec_key)) == NULL) {
OPENSSL_PUT_ERROR(EVP, eckey_param2type, EVP_R_MISSING_PARAMETERS);
return 0;
}
nid = EC_GROUP_get_curve_name(group);
if (nid == NID_undef) {
OPENSSL_PUT_ERROR(EVP, eckey_param2type, EVP_R_NO_NID_FOR_CURVE);
return 0;
}
*ppval = (void*) OBJ_nid2obj(nid);
*pptype = V_ASN1_OBJECT;
return 1;
}
static int eckey_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey) {
EC_KEY *ec_key = pkey->pkey.ec;
void *pval = NULL;
int ptype;
uint8_t *penc = NULL, *p;
int penclen;
if (!eckey_param2type(&ptype, &pval, ec_key)) {
OPENSSL_PUT_ERROR(EVP, eckey_pub_encode, ERR_R_EC_LIB);
return 0;
}
penclen = i2o_ECPublicKey(ec_key, NULL);
if (penclen <= 0) {
goto err;
}
penc = OPENSSL_malloc(penclen);
if (!penc) {
goto err;
}
p = penc;
penclen = i2o_ECPublicKey(ec_key, &p);
if (penclen <= 0) {
goto err;
}
if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_EC), ptype, pval, penc,
penclen)) {
return 1;
}
err:
if (ptype == V_ASN1_OBJECT) {
ASN1_OBJECT_free(pval);
} else {
ASN1_STRING_free(pval);
}
if (penc) {
OPENSSL_free(penc);
}
return 0;
}
static EC_KEY *eckey_type2param(int ptype, void *pval) {
EC_KEY *eckey = NULL;
if (ptype == V_ASN1_SEQUENCE) {
ASN1_STRING *pstr = pval;
const uint8_t *pm = pstr->data;
int pmlen = pstr->length;
eckey = d2i_ECParameters(NULL, &pm, pmlen);
if (eckey == NULL) {
OPENSSL_PUT_ERROR(EVP, eckey_type2param, EVP_R_DECODE_ERROR);
goto err;
}
} else if (ptype == V_ASN1_OBJECT) {
ASN1_OBJECT *poid = pval;
EC_GROUP *group;
/* type == V_ASN1_OBJECT => the parameters are given
* by an asn1 OID */
eckey = EC_KEY_new();
if (eckey == NULL) {
OPENSSL_PUT_ERROR(EVP, eckey_type2param, ERR_R_MALLOC_FAILURE);
goto err;
}
group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(poid));
if (group == NULL) {
goto err;
}
if (EC_KEY_set_group(eckey, group) == 0) {
goto err;
}
EC_GROUP_free(group);
} else {
OPENSSL_PUT_ERROR(EVP, eckey_type2param, EVP_R_DECODE_ERROR);
goto err;
}
return eckey;
err:
if (eckey) {
EC_KEY_free(eckey);
}
return NULL;
}
static int eckey_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey) {
const uint8_t *p = NULL;
void *pval;
int ptype, pklen;
EC_KEY *eckey = NULL;
X509_ALGOR *palg;
if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey)) {
return 0;
}
X509_ALGOR_get0(NULL, &ptype, &pval, palg);
eckey = eckey_type2param(ptype, pval);
if (!eckey) {
OPENSSL_PUT_ERROR(EVP, eckey_pub_decode, ERR_R_EC_LIB);
return 0;
}
/* We have parameters now set public key */
if (!o2i_ECPublicKey(&eckey, &p, pklen)) {
OPENSSL_PUT_ERROR(EVP, eckey_pub_decode, EVP_R_DECODE_ERROR);
goto err;
}
EVP_PKEY_assign_EC_KEY(pkey, eckey);
return 1;
err:
if (eckey)
EC_KEY_free(eckey);
return 0;
}
static int eckey_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) {
int r;
const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec);
const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec),
*pb = EC_KEY_get0_public_key(b->pkey.ec);
r = EC_POINT_cmp(group, pa, pb, NULL);
if (r == 0) {
return 1;
} else if (r == 1) {
return 0;
} else {
return -2;
}
}
static int eckey_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8) {
const uint8_t *p = NULL;
void *pval;
int ptype, pklen;
EC_KEY *eckey = NULL;
X509_ALGOR *palg;
if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8)) {
return 0;
}
X509_ALGOR_get0(NULL, &ptype, &pval, palg);
eckey = eckey_type2param(ptype, pval);
if (!eckey)
goto ecliberr;
/* We have parameters now set private key */
if (!d2i_ECPrivateKey(&eckey, &p, pklen)) {
OPENSSL_PUT_ERROR(EVP, eckey_priv_decode, EVP_R_DECODE_ERROR);
goto ecerr;
}
/* calculate public key (if necessary) */
if (EC_KEY_get0_public_key(eckey) == NULL) {
const BIGNUM *priv_key;
const EC_GROUP *group;
EC_POINT *pub_key;
/* the public key was not included in the SEC1 private
* key => calculate the public key */
group = EC_KEY_get0_group(eckey);
pub_key = EC_POINT_new(group);
if (pub_key == NULL) {
OPENSSL_PUT_ERROR(EVP, eckey_priv_decode, ERR_R_EC_LIB);
goto ecliberr;
}
if (!EC_POINT_copy(pub_key, EC_GROUP_get0_generator(group))) {
EC_POINT_free(pub_key);
OPENSSL_PUT_ERROR(EVP, eckey_priv_decode, ERR_R_EC_LIB);
goto ecliberr;
}
priv_key = EC_KEY_get0_private_key(eckey);
if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, NULL)) {
EC_POINT_free(pub_key);
OPENSSL_PUT_ERROR(EVP, eckey_priv_decode, ERR_R_EC_LIB);
goto ecliberr;
}
if (EC_KEY_set_public_key(eckey, pub_key) == 0) {
EC_POINT_free(pub_key);
OPENSSL_PUT_ERROR(EVP, eckey_priv_decode, ERR_R_EC_LIB);
goto ecliberr;
}
EC_POINT_free(pub_key);
}
EVP_PKEY_assign_EC_KEY(pkey, eckey);
return 1;
ecliberr:
OPENSSL_PUT_ERROR(EVP, eckey_priv_decode, ERR_R_EC_LIB);
ecerr:
if (eckey)
EC_KEY_free(eckey);
return 0;
}
static int eckey_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey) {
EC_KEY *ec_key;
uint8_t *ep, *p;
int eplen, ptype;
void *pval;
unsigned int tmp_flags, old_flags;
ec_key = pkey->pkey.ec;
if (!eckey_param2type(&ptype, &pval, ec_key)) {
OPENSSL_PUT_ERROR(EVP, eckey_priv_encode, EVP_R_DECODE_ERROR);
return 0;
}
/* set the private key */
/* do not include the parameters in the SEC1 private key
* see PKCS#11 12.11 */
old_flags = EC_KEY_get_enc_flags(ec_key);
tmp_flags = old_flags | EC_PKEY_NO_PARAMETERS;
EC_KEY_set_enc_flags(ec_key, tmp_flags);
eplen = i2d_ECPrivateKey(ec_key, NULL);
if (!eplen) {
EC_KEY_set_enc_flags(ec_key, old_flags);
OPENSSL_PUT_ERROR(EVP, eckey_priv_encode, ERR_R_EC_LIB);
return 0;
}
ep = (uint8_t *)OPENSSL_malloc(eplen);
if (!ep) {
EC_KEY_set_enc_flags(ec_key, old_flags);
OPENSSL_PUT_ERROR(EVP, eckey_priv_encode, ERR_R_MALLOC_FAILURE);
return 0;
}
p = ep;
if (!i2d_ECPrivateKey(ec_key, &p)) {
EC_KEY_set_enc_flags(ec_key, old_flags);
OPENSSL_free(ep);
OPENSSL_PUT_ERROR(EVP, eckey_priv_encode, ERR_R_EC_LIB);
return 0;
}
/* restore old encoding flags */
EC_KEY_set_enc_flags(ec_key, old_flags);
if (!PKCS8_pkey_set0(p8, (ASN1_OBJECT *)OBJ_nid2obj(NID_X9_62_id_ecPublicKey),
0, ptype, pval, ep, eplen)) {
return 0;
}
return 1;
}
static int int_ec_size(const EVP_PKEY *pkey) {
return ECDSA_size(pkey->pkey.ec);
}
static int ec_bits(const EVP_PKEY *pkey) {
BIGNUM *order = BN_new();
const EC_GROUP *group;
int ret;
if (!order) {
ERR_clear_error();
return 0;
}
group = EC_KEY_get0_group(pkey->pkey.ec);
if (!EC_GROUP_get_order(group, order, NULL)) {
ERR_clear_error();
return 0;
}
ret = BN_num_bits(order);
BN_free(order);
return ret;
}
static int ec_missing_parameters(const EVP_PKEY *pkey) {
return EC_KEY_get0_group(pkey->pkey.ec) == NULL;
}
static int ec_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from) {
EC_GROUP *group = EC_GROUP_dup(EC_KEY_get0_group(from->pkey.ec));
if (group == NULL ||
EC_KEY_set_group(to->pkey.ec, group) == 0) {
return 0;
}
EC_GROUP_free(group);
return 1;
}
static int ec_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b) {
const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec),
*group_b = EC_KEY_get0_group(b->pkey.ec);
return EC_GROUP_cmp(group_a, group_b);
}
static void int_ec_free(EVP_PKEY *pkey) { EC_KEY_free(pkey->pkey.ec); }
static int do_EC_KEY_print(BIO *bp, const EC_KEY *x, int off, int ktype) {
uint8_t *buffer = NULL;
const char *ecstr;
size_t buf_len = 0, i;
int ret = 0, reason = ERR_R_BIO_LIB;
BIGNUM *order = NULL;
BN_CTX *ctx = NULL;
const EC_GROUP *group;
const EC_POINT *public_key;
const BIGNUM *priv_key;
uint8_t *pub_key_bytes = NULL;
size_t pub_key_bytes_len = 0;
if (x == NULL || (group = EC_KEY_get0_group(x)) == NULL) {
reason = ERR_R_PASSED_NULL_PARAMETER;
goto err;
}
ctx = BN_CTX_new();
if (ctx == NULL) {
reason = ERR_R_MALLOC_FAILURE;
goto err;
}
if (ktype > 0) {
public_key = EC_KEY_get0_public_key(x);
if (public_key != NULL) {
pub_key_bytes_len = EC_POINT_point2oct(
group, public_key, EC_KEY_get_conv_form(x), NULL, 0, ctx);
if (pub_key_bytes_len == 0) {
reason = ERR_R_MALLOC_FAILURE;
goto err;
}
pub_key_bytes = OPENSSL_malloc(pub_key_bytes_len);
if (pub_key_bytes == NULL) {
reason = ERR_R_MALLOC_FAILURE;
goto err;
}
pub_key_bytes_len =
EC_POINT_point2oct(group, public_key, EC_KEY_get_conv_form(x),
pub_key_bytes, pub_key_bytes_len, ctx);
if (pub_key_bytes_len == 0) {
reason = ERR_R_MALLOC_FAILURE;
goto err;
}
buf_len = pub_key_bytes_len;
}
}
if (ktype == 2) {
priv_key = EC_KEY_get0_private_key(x);
if (priv_key && (i = (size_t)BN_num_bytes(priv_key)) > buf_len)
buf_len = i;
} else
priv_key = NULL;
if (ktype > 0) {
buf_len += 10;
if ((buffer = OPENSSL_malloc(buf_len)) == NULL) {
reason = ERR_R_MALLOC_FAILURE;
goto err;
}
}
if (ktype == 2)
ecstr = "Private-Key";
else if (ktype == 1)
ecstr = "Public-Key";
else
ecstr = "ECDSA-Parameters";
if (!BIO_indent(bp, off, 128))
goto err;
if ((order = BN_new()) == NULL)
goto err;
if (!EC_GROUP_get_order(group, order, NULL))
goto err;
if (BIO_printf(bp, "%s: (%d bit)\n", ecstr, BN_num_bits(order)) <= 0)
goto err;
if ((priv_key != NULL) && !ASN1_bn_print(bp, "priv:", priv_key, buffer, off))
goto err;
if (pub_key_bytes != NULL) {
BIO_hexdump(bp, pub_key_bytes, pub_key_bytes_len, off);
}
/* TODO(fork): implement */
/*
if (!ECPKParameters_print(bp, group, off))
goto err; */
ret = 1;
err:
if (!ret)
OPENSSL_PUT_ERROR(EVP, do_EC_KEY_print, reason);
if (pub_key_bytes)
OPENSSL_free(pub_key_bytes);
if (order)
BN_free(order);
if (ctx)
BN_CTX_free(ctx);
if (buffer != NULL)
OPENSSL_free(buffer);
return ret;
}
static int eckey_param_decode(EVP_PKEY *pkey, const uint8_t **pder,
int derlen) {
EC_KEY *eckey;
if (!(eckey = d2i_ECParameters(NULL, pder, derlen))) {
OPENSSL_PUT_ERROR(EVP, eckey_param_decode, ERR_R_EC_LIB);
return 0;
}
EVP_PKEY_assign_EC_KEY(pkey, eckey);
return 1;
}
static int eckey_param_encode(const EVP_PKEY *pkey, uint8_t **pder) {
return i2d_ECParameters(pkey->pkey.ec, pder);
}
static int eckey_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *ctx) {
return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 0);
}
static int eckey_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *ctx) {
return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 1);
}
static int eckey_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *ctx) {
return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 2);
}
static int old_ec_priv_decode(EVP_PKEY *pkey, const uint8_t **pder,
int derlen) {
EC_KEY *ec;
if (!(ec = d2i_ECPrivateKey(NULL, pder, derlen))) {
OPENSSL_PUT_ERROR(EVP, old_ec_priv_decode, EVP_R_DECODE_ERROR);
return 0;
}
EVP_PKEY_assign_EC_KEY(pkey, ec);
return 1;
}
static int old_ec_priv_encode(const EVP_PKEY *pkey, uint8_t **pder) {
return i2d_ECPrivateKey(pkey->pkey.ec, pder);
}
static int ec_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2) {
switch (op) {
case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
*(int *)arg2 = NID_sha1;
return 2;
default:
return -2;
}
}
const EVP_PKEY_ASN1_METHOD ec_asn1_meth = {
EVP_PKEY_EC,
EVP_PKEY_EC,
0,
"EC",
"OpenSSL EC algorithm",
eckey_pub_decode,
eckey_pub_encode,
eckey_pub_cmp,
eckey_pub_print,
eckey_priv_decode,
eckey_priv_encode,
eckey_priv_print,
int_ec_size,
ec_bits,
eckey_param_decode,
eckey_param_encode,
ec_missing_parameters,
ec_copy_parameters,
ec_cmp_parameters,
eckey_param_print,
0,
int_ec_free,
ec_pkey_ctrl,
old_ec_priv_decode,
old_ec_priv_encode
};