4 Commits (fd3ed85c67174a0d3b6639ba9b237351d1c2201f)

Author SHA1 Message Date
Shane Lontis e5b2cd5899 Change the provider implementation of X942kdf to use wpacket to do der encoding of sharedInfo
Added der_writer functions for writing octet string primitives.
Generate OID's for key wrapping algorithms used by X942 KDF.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/12554)
3 years ago
Richard Levitte 6c6b20d591 DER writer: Make context-specific tags constructed (i.e. explicit)
For now, that's what we see being used.  It's possible that we will
have to figure out a way to specific if these should be implicit or
explicit on a case by case basis.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/12544)
3 years ago
Richard Levitte 2275ff656c DER writer: Add the possibility to abandon empty SEQUENCEs
In some cases, a SEQUENCE that contains only optional fields may end
up empty.  In some cases, this may be represented by dropping the
SEQUENCE entirely from the encoded DER.

To do this, we detect the case where WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH
is used, and adapt accordingly.

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/11710)
3 years ago
Richard Levitte 1d39620b34 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)
3 years ago