--- /dev/null
+/* 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/bn.h>
+#include <openssl/bytestring.h>
+#include <openssl/ec.h>
+#include <openssl/ec_key.h>
+#include <openssl/ecdsa.h>
+#include <openssl/err.h>
+
+#include "internal.h"
+
+
+static int eckey_pub_encode(CBB *out, const EVP_PKEY *key) {
+ const EC_KEY *ec_key = key->pkey.ec;
+ const EC_GROUP *group = EC_KEY_get0_group(ec_key);
+ const EC_POINT *public_key = EC_KEY_get0_public_key(ec_key);
+
+ // See RFC 5480, section 2.
+ CBB spki, algorithm, oid, key_bitstring;
+ if (!CBB_add_asn1(out, &spki, CBS_ASN1_SEQUENCE) ||
+ !CBB_add_asn1(&spki, &algorithm, CBS_ASN1_SEQUENCE) ||
+ !CBB_add_asn1(&algorithm, &oid, CBS_ASN1_OBJECT) ||
+ !CBB_add_bytes(&oid, ec_asn1_meth.oid, ec_asn1_meth.oid_len) ||
+ !EC_KEY_marshal_curve_name(&algorithm, group) ||
+ !CBB_add_asn1(&spki, &key_bitstring, CBS_ASN1_BITSTRING) ||
+ !CBB_add_u8(&key_bitstring, 0 /* padding */) ||
+ !EC_POINT_point2cbb(&key_bitstring, group, public_key,
+ POINT_CONVERSION_UNCOMPRESSED, NULL) ||
+ !CBB_flush(out)) {
+ OPENSSL_PUT_ERROR(EVP, EVP_R_ENCODE_ERROR);
+ return 0;
+ }
+
+ return 1;
+}
+
+static int eckey_pub_decode(EVP_PKEY *out, CBS *params, CBS *key) {
+ // See RFC 5480, section 2.
+
+ // The parameters are a named curve.
+ EC_POINT *point = NULL;
+ EC_KEY *eckey = NULL;
+ EC_GROUP *group = EC_KEY_parse_curve_name(params);
+ if (group == NULL || CBS_len(params) != 0) {
+ OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
+ goto err;
+ }
+
+ eckey = EC_KEY_new();
+ if (eckey == NULL || !EC_KEY_set_group(eckey, group)) {
+ goto err;
+ }
+
+ point = EC_POINT_new(group);
+ if (point == NULL ||
+ !EC_POINT_oct2point(group, point, CBS_data(key), CBS_len(key), NULL) ||
+ !EC_KEY_set_public_key(eckey, point)) {
+ goto err;
+ }
+
+ EC_GROUP_free(group);
+ EC_POINT_free(point);
+ EVP_PKEY_assign_EC_KEY(out, eckey);
+ return 1;
+
+err:
+ EC_GROUP_free(group);
+ EC_POINT_free(point);
+ 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 *out, CBS *params, CBS *key) {
+ // See RFC 5915.
+ EC_GROUP *group = EC_KEY_parse_parameters(params);
+ if (group == NULL || CBS_len(params) != 0) {
+ OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
+ EC_GROUP_free(group);
+ return 0;
+ }
+
+ EC_KEY *ec_key = EC_KEY_parse_private_key(key, group);
+ EC_GROUP_free(group);
+ if (ec_key == NULL || CBS_len(key) != 0) {
+ OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
+ EC_KEY_free(ec_key);
+ return 0;
+ }
+
+ EVP_PKEY_assign_EC_KEY(out, ec_key);
+ return 1;
+}
+
+static int eckey_priv_encode(CBB *out, const EVP_PKEY *key) {
+ const EC_KEY *ec_key = key->pkey.ec;
+
+ // Omit the redundant copy of the curve name. This contradicts RFC 5915 but
+ // aligns with PKCS #11. SEC 1 only says they may be omitted if known by other
+ // means. Both OpenSSL and NSS omit the redundant parameters, so we omit them
+ // as well.
+ unsigned enc_flags = EC_KEY_get_enc_flags(ec_key) | EC_PKEY_NO_PARAMETERS;
+
+ // See RFC 5915.
+ CBB pkcs8, algorithm, oid, private_key;
+ if (!CBB_add_asn1(out, &pkcs8, CBS_ASN1_SEQUENCE) ||
+ !CBB_add_asn1_uint64(&pkcs8, 0 /* version */) ||
+ !CBB_add_asn1(&pkcs8, &algorithm, CBS_ASN1_SEQUENCE) ||
+ !CBB_add_asn1(&algorithm, &oid, CBS_ASN1_OBJECT) ||
+ !CBB_add_bytes(&oid, ec_asn1_meth.oid, ec_asn1_meth.oid_len) ||
+ !EC_KEY_marshal_curve_name(&algorithm, EC_KEY_get0_group(ec_key)) ||
+ !CBB_add_asn1(&pkcs8, &private_key, CBS_ASN1_OCTETSTRING) ||
+ !EC_KEY_marshal_private_key(&private_key, ec_key, enc_flags) ||
+ !CBB_flush(out)) {
+ OPENSSL_PUT_ERROR(EVP, EVP_R_ENCODE_ERROR);
+ 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) {
+ const EC_GROUP *group = EC_KEY_get0_group(pkey->pkey.ec);
+ if (group == NULL) {
+ ERR_clear_error();
+ return 0;
+ }
+ return BN_num_bits(EC_GROUP_get0_order(group));
+}
+
+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);
+ if (EC_GROUP_cmp(group_a, group_b, NULL) != 0) {
+ // mismatch
+ return 0;
+ }
+ return 1;
+}
+
+static void int_ec_free(EVP_PKEY *pkey) { EC_KEY_free(pkey->pkey.ec); }
+
+static int eckey_opaque(const EVP_PKEY *pkey) {
+ return EC_KEY_is_opaque(pkey->pkey.ec);
+}
+
+const EVP_PKEY_ASN1_METHOD ec_asn1_meth = {
+ EVP_PKEY_EC,
+ // 1.2.840.10045.2.1
+ {0x2a, 0x86, 0x48, 0xce, 0x3d, 0x02, 0x01}, 7,
+
+ eckey_pub_decode,
+ eckey_pub_encode,
+ eckey_pub_cmp,
+
+ eckey_priv_decode,
+ eckey_priv_encode,
+
+ eckey_opaque,
+
+ int_ec_size,
+ ec_bits,
+
+ ec_missing_parameters,
+ ec_copy_parameters,
+ ec_cmp_parameters,
+
+ int_ec_free,
+};
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