98 lines
3.2 KiB
C
98 lines
3.2 KiB
C
/*
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* Copyright (c) 2018 Thomas Pornin <pornin@bolet.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "t_inner.h"
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/* see bearssl_x509.h */
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size_t
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br_encode_rsa_pkcs8_der(void *dest, const br_rsa_private_key *sk,
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const br_rsa_public_key *pk, const void *d, size_t dlen)
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{
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/*
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* ASN.1 format:
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*
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* OneAsymmetricKey ::= SEQUENCE {
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* version Version,
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* privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
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* privateKey PrivateKey,
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* attributes [0] Attributes OPTIONAL,
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* ...,
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* [[2: publicKey [1] PublicKey OPTIONAL ]],
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* ...
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* }
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*
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* We don't include attributes or public key. The 'version' field
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* is an INTEGER that we will set to 0 (meaning 'v1', compatible
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* with previous versions of PKCS#8). The 'privateKeyAlgorithm'
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* structure is an AlgorithmIdentifier whose OID should be
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* rsaEncryption, with NULL parameters. The 'privateKey' is an
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* OCTET STRING, whose value is the "raw DER" encoding of the
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* key pair.
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*
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* Since the private key value comes last, this function really
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* adds a header, which is mostly fixed (only some lengths have
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* to be modified.
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*/
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/*
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* Concatenation of:
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* - DER encoding of an INTEGER of value 0 (the 'version' field)
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* - DER encoding of a PrivateKeyAlgorithmIdentifier that uses
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* the rsaEncryption OID, and NULL parameters
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* - An OCTET STRING tag
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*/
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static const unsigned char PK8_HEAD[] = {
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0x02, 0x01, 0x00,
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0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86,
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0xf7, 0x0d, 0x01, 0x01, 0x01, 0x05, 0x00,
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0x04
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};
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size_t len_raw, len_seq;
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len_raw = br_encode_rsa_raw_der(NULL, sk, pk, d, dlen);
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len_seq = (sizeof PK8_HEAD) + len_of_len(len_raw) + len_raw;
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if (dest == NULL) {
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return 1 + len_of_len(len_seq) + len_seq;
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} else {
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unsigned char *buf;
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size_t lenlen;
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buf = dest;
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*buf ++ = 0x30; /* SEQUENCE tag */
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lenlen = br_asn1_encode_length(buf, len_seq);
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buf += lenlen;
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/* version, privateKeyAlgorithm, privateKey tag */
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memcpy(buf, PK8_HEAD, sizeof PK8_HEAD);
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buf += sizeof PK8_HEAD;
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/* privateKey */
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buf += br_asn1_encode_length(buf, len_raw);
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br_encode_rsa_raw_der(buf, sk, pk, d, dlen);
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return 1 + lenlen + len_seq;
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}
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}
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