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ASN.1: Add a helper for parsing INTEGER

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Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen 2019-12-12 02:28:39 +02:00 committed by Jouni Malinen
parent 5e98998ec1
commit 3393d94d02
2 changed files with 38 additions and 0 deletions
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37
src/tls/asn1.c
View file

@ -270,3 +270,40 @@ int asn1_oid_equal(const struct asn1_oid *a, const struct asn1_oid *b)
return 1;
}
int asn1_get_integer(const u8 *buf, size_t len, int *integer, const u8 **next)
{
struct asn1_hdr hdr;
size_t left;
const u8 *pos;
int value;
if (asn1_get_next(buf, len, &hdr) < 0 || hdr.length == 0)
return -1;
if (hdr.class != ASN1_CLASS_UNIVERSAL || hdr.tag != ASN1_TAG_INTEGER) {
wpa_printf(MSG_DEBUG,
"ASN.1: Expected INTEGER - found class %d tag 0x%x",
hdr.class, hdr.tag);
return -1;
}
*next = hdr.payload + hdr.length;
pos = hdr.payload;
left = hdr.length;
if (left > sizeof(value)) {
wpa_printf(MSG_DEBUG, "ASN.1: Too large INTEGER (len %u)",
hdr.length);
return -1;
}
value = 0;
while (left) {
value <<= 8;
value |= *pos++;
left--;
}
*integer = value;
return 0;
}

1
src/tls/asn1.h
View file

@ -65,6 +65,7 @@ int asn1_get_oid(const u8 *buf, size_t len, struct asn1_oid *oid,
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);
extern struct asn1_oid asn1_sha1_oid;
extern struct asn1_oid asn1_sha256_oid;