--- /dev/null
+/*
+ * Copyright (c) 2018 Thomas Pornin <pornin@bolet.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "inner.h"
+
+/* see inner.h */
+const unsigned char *
+br_get_curve_OID(int curve)
+{
+ static const unsigned char OID_secp256r1[] = {
+ 0x08, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07
+ };
+ static const unsigned char OID_secp384r1[] = {
+ 0x05, 0x2b, 0x81, 0x04, 0x00, 0x22
+ };
+ static const unsigned char OID_secp521r1[] = {
+ 0x05, 0x2b, 0x81, 0x04, 0x00, 0x23
+ };
+
+ switch (curve) {
+ case BR_EC_secp256r1: return OID_secp256r1;
+ case BR_EC_secp384r1: return OID_secp384r1;
+ case BR_EC_secp521r1: return OID_secp521r1;
+ default:
+ return NULL;
+ }
+}
+
+/* see inner.h */
+size_t
+br_encode_ec_raw_der_inner(void *dest,
+ const br_ec_private_key *sk, const br_ec_public_key *pk,
+ int include_curve_oid)
+{
+ /*
+ * ASN.1 format:
+ *
+ * ECPrivateKey ::= SEQUENCE {
+ * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
+ * privateKey OCTET STRING,
+ * parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
+ * publicKey [1] BIT STRING OPTIONAL
+ * }
+ *
+ * The tages '[0]' and '[1]' are explicit. The 'ECParameters'
+ * is a CHOICE; in our case, it will always be an OBJECT IDENTIFIER
+ * that identifies the curve.
+ *
+ * The value of the 'privateKey' field is the raw unsigned big-endian
+ * encoding of the private key (integer modulo the curve subgroup
+ * order); there is no INTEGER tag, and the leading bit may be 1.
+ * Also, leading bytes of value 0x00 are _not_ removed.
+ *
+ * The 'publicKey' contents are the raw encoded public key point,
+ * normally uncompressed (leading byte of value 0x04, followed
+ * by the unsigned big-endian encodings of the X and Y coordinates,
+ * padded to the full field length if necessary).
+ */
+
+ size_t len_version, len_privateKey, len_parameters, len_publicKey;
+ size_t len_publicKey_bits, len_seq;
+ const unsigned char *oid;
+
+ if (include_curve_oid) {
+ oid = br_get_curve_OID(sk->curve);
+ if (oid == NULL) {
+ return 0;
+ }
+ } else {
+ oid = NULL;
+ }
+ len_version = 3;
+ len_privateKey = 1 + len_of_len(sk->xlen) + sk->xlen;
+ if (include_curve_oid) {
+ len_parameters = 4 + oid[0];
+ } else {
+ len_parameters = 0;
+ }
+ if (pk == NULL) {
+ len_publicKey = 0;
+ len_publicKey_bits = 0;
+ } else {
+ len_publicKey_bits = 2 + len_of_len(pk->qlen) + pk->qlen;
+ len_publicKey = 1 + len_of_len(len_publicKey_bits)
+ + len_publicKey_bits;
+ }
+ len_seq = len_version + len_privateKey + len_parameters + len_publicKey;
+ if (dest == NULL) {
+ return 1 + len_of_len(len_seq) + len_seq;
+ } else {
+ unsigned char *buf;
+ size_t lenlen;
+
+ buf = dest;
+ *buf ++ = 0x30; /* SEQUENCE tag */
+ lenlen = br_asn1_encode_length(buf, len_seq);
+ buf += lenlen;
+
+ /* version */
+ *buf ++ = 0x02;
+ *buf ++ = 0x01;
+ *buf ++ = 0x01;
+
+ /* privateKey */
+ *buf ++ = 0x04;
+ buf += br_asn1_encode_length(buf, sk->xlen);
+ memcpy(buf, sk->x, sk->xlen);
+ buf += sk->xlen;
+
+ /* parameters */
+ if (include_curve_oid) {
+ *buf ++ = 0xA0;
+ *buf ++ = oid[0] + 2;
+ *buf ++ = 0x06;
+ memcpy(buf, oid, oid[0] + 1);
+ buf += oid[0] + 1;
+ }
+
+ /* publicKey */
+ if (pk != NULL) {
+ *buf ++ = 0xA1;
+ buf += br_asn1_encode_length(buf, len_publicKey_bits);
+ *buf ++ = 0x03;
+ buf += br_asn1_encode_length(buf, pk->qlen + 1);
+ *buf ++ = 0x00;
+ memcpy(buf, pk->q, pk->qlen);
+ /* buf += pk->qlen; */
+ }
+
+ return 1 + lenlen + len_seq;
+ }
+}
+
+/* see bearssl_x509.h */
+size_t
+br_encode_ec_raw_der(void *dest,
+ const br_ec_private_key *sk, const br_ec_public_key *pk)
+{
+ return br_encode_ec_raw_der_inner(dest, sk, pk, 1);
+}
projects / BearSSL / blobdiff