PROV: Add the beginning of a DER writing library
This library is meant to be small and quick. It's based on WPACKET,
which was extended to support DER writing. The way it's used is a
bit unusual, as it's used to write the structures backward into a
given buffer. A typical quick call looks like this:
/*
* Fill in this structure:
*
* something ::= SEQUENCE {
* id OBJECT IDENTIFIER,
* x [0] INTEGER OPTIONAL,
* y [1] BOOLEAN OPTIONAL,
* n INTEGER
* }
*/
unsigned char buf[nnnn], *p = NULL;
size_t encoded_len = 0;
WPACKET pkt;
int ok;
ok = WPACKET_init_der(&pkt, buf, sizeof(buf)
&& DER_w_start_sequence(&pkt, -1)
&& DER_w_bn(&pkt, -1, bn)
&& DER_w_boolean(&pkt, 1, bool)
&& DER_w_precompiled(&pkt, -1, OID, sizeof(OID))
&& DER_w_end_sequence(&pkt, -1)
&& WPACKET_finish(&pkt)
&& WPACKET_get_total_written(&pkt, &encoded_len)
&& (p = WPACKET_get_curr(&pkt)) != NULL;
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11450)
2020-03-31 22:54:43 +08:00
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SUBDIRS=der
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2020-05-12 15:02:25 +08:00
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SOURCE[../libcommon.a]=provider_err.c bio_prov.c provider_ctx.c
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2019-10-04 07:38:17 +08:00
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$FIPSCOMMON=provider_util.c
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2019-11-08 17:29:24 +08:00
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SOURCE[../libnonfips.a]=$FIPSCOMMON nid_to_name.c
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2019-10-04 07:38:17 +08:00
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SOURCE[../libfips.a]=$FIPSCOMMON
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