111 lines
3.5 KiB
C
111 lines
3.5 KiB
C
/*
|
|
* 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 "t_inner.h"
|
|
|
|
/* see bearssl_x509.h */
|
|
size_t
|
|
br_encode_ec_pkcs8_der(void *dest,
|
|
const br_ec_private_key *sk, const br_ec_public_key *pk)
|
|
{
|
|
/*
|
|
* ASN.1 format:
|
|
*
|
|
* OneAsymmetricKey ::= SEQUENCE {
|
|
* version Version,
|
|
* privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
|
|
* privateKey PrivateKey,
|
|
* attributes [0] Attributes OPTIONAL,
|
|
* ...,
|
|
* [[2: publicKey [1] PublicKey OPTIONAL ]],
|
|
* ...
|
|
* }
|
|
*
|
|
* We don't include attributes or public key (the public key
|
|
* is included in the private key value instead). The
|
|
* 'version' field is an INTEGER that we will set to 0
|
|
* (meaning 'v1', compatible with previous versions of PKCS#8).
|
|
* The 'privateKeyAlgorithm' structure is an AlgorithmIdentifier
|
|
* whose OID should be id-ecPublicKey, with, as parameters, the
|
|
* curve OID. The 'privateKey' is an OCTET STRING, whose value
|
|
* is the "raw DER" encoding of the key pair.
|
|
*/
|
|
|
|
/*
|
|
* OID id-ecPublicKey (1.2.840.10045.2.1), DER-encoded (with
|
|
* the tag).
|
|
*/
|
|
static const unsigned char OID_ECPUBKEY[] = {
|
|
0x06, 0x07, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x02, 0x01
|
|
};
|
|
|
|
size_t len_version, len_privateKeyAlgorithm, len_privateKeyValue;
|
|
size_t len_privateKey, len_seq;
|
|
const unsigned char *oid;
|
|
|
|
oid = br_get_curve_OID(sk->curve);
|
|
if (oid == NULL) {
|
|
return 0;
|
|
}
|
|
len_version = 3;
|
|
len_privateKeyAlgorithm = 2 + sizeof OID_ECPUBKEY + 2 + oid[0];
|
|
len_privateKeyValue = br_encode_ec_raw_der_inner(NULL, sk, pk, 0);
|
|
len_privateKey = 1 + len_of_len(len_privateKeyValue)
|
|
+ len_privateKeyValue;
|
|
len_seq = len_version + len_privateKeyAlgorithm + len_privateKey;
|
|
|
|
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 ++ = 0x00;
|
|
|
|
/* privateKeyAlgorithm */
|
|
*buf ++ = 0x30;
|
|
*buf ++ = (sizeof OID_ECPUBKEY) + 2 + oid[0];
|
|
memcpy(buf, OID_ECPUBKEY, sizeof OID_ECPUBKEY);
|
|
buf += sizeof OID_ECPUBKEY;
|
|
*buf ++ = 0x06;
|
|
memcpy(buf, oid, 1 + oid[0]);
|
|
buf += 1 + oid[0];
|
|
|
|
/* privateKey */
|
|
*buf ++ = 0x04;
|
|
buf += br_asn1_encode_length(buf, len_privateKeyValue);
|
|
br_encode_ec_raw_der_inner(buf, sk, pk, 0);
|
|
|
|
return 1 + lenlen + len_seq;
|
|
}
|
|
}
|