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ASN.1: Add a helper for parsing SEQUENCE

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Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen 2020-01-30 12:11:51 +02:00 committed by Jouni Malinen
parent 3393d94d02
commit f7f2843c45
2 changed files with 20 additions and 0 deletions
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18
src/tls/asn1.c
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@ -307,3 +307,21 @@ int asn1_get_integer(const u8 *buf, size_t len, int *integer, const u8 **next)
*integer = value;
return 0;
}
int asn1_get_sequence(const u8 *buf, size_t len, struct asn1_hdr *hdr,
const u8 **next)
{
if (asn1_get_next(buf, len, hdr) < 0 ||
hdr->class != ASN1_CLASS_UNIVERSAL ||
hdr->tag != ASN1_TAG_SEQUENCE) {
wpa_printf(MSG_DEBUG,
"ASN.1: Expected SEQUENCE - found class %d tag 0x%x",
hdr->class, hdr->tag);
return -1;
}
if (next)
*next = hdr->payload + hdr->length;
return 0;
}

2
src/tls/asn1.h
View file

@ -66,6 +66,8 @@ void asn1_oid_to_str(const struct asn1_oid *oid, char *buf, size_t len);
unsigned long asn1_bit_string_to_long(const u8 *buf, size_t len);
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);
extern struct asn1_oid asn1_sha1_oid;
extern struct asn1_oid asn1_sha256_oid;