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ASN.1: Add a helper for parsing AlgorithmIdentifier

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Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen 2020-01-30 15:04:03 +02:00 committed by Jouni Malinen
parent f7f2843c45
commit 8006742fa3
2 changed files with 26 additions and 0 deletions
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24
src/tls/asn1.c
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@ -325,3 +325,27 @@ int asn1_get_sequence(const u8 *buf, size_t len, struct asn1_hdr *hdr,
*next = hdr->payload + hdr->length;
return 0;
}
int asn1_get_alg_id(const u8 *buf, size_t len, struct asn1_oid *oid,
const u8 **params, size_t *params_len, const u8 **next)
{
const u8 *pos = buf, *end = buf + len;
struct asn1_hdr hdr;
/*
* AlgorithmIdentifier ::= SEQUENCE {
* algorithm OBJECT IDENTIFIER,
* parameters ANY DEFINED BY algorithm OPTIONAL}
*/
if (asn1_get_sequence(pos, end - pos, &hdr, next) < 0 ||
asn1_get_oid(hdr.payload, hdr.length, oid, &pos) < 0)
return -1;
if (params && params_len) {
*params = pos;
*params_len = hdr.payload + hdr.length - pos;
}
return 0;
}

2
src/tls/asn1.h
View file

@ -68,6 +68,8 @@ int asn1_oid_equal(const struct asn1_oid *a, const struct asn1_oid *b);
int asn1_get_integer(const u8 *buf, size_t len, int *integer, const u8 **next);
int asn1_get_sequence(const u8 *buf, size_t len, struct asn1_hdr *hdr,
const u8 **next);
int asn1_get_alg_id(const u8 *buf, size_t len, struct asn1_oid *oid,
const u8 **params, size_t *params_len, const u8 **next);
extern struct asn1_oid asn1_sha1_oid;
extern struct asn1_oid asn1_sha256_oid;