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Adding asn1_find_tag() for searching for a tag in a asn1 string.

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Pol Henarejos
2022-05-30 23:31:17 +02:00
parent ef52ae37d3
commit 950e276ee8
4 changed files with 31 additions and 10 deletions
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18
src/ccid/ccid2040.c
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@@ -553,16 +553,20 @@ int format_tlv_len(size_t len, uint8_t *out) {
return 0;
}
int walk_tlv(const uint8_t *cdata, size_t cdata_len, uint8_t **p, uint8_t *tag, size_t *tag_len, uint8_t **data) {
int walk_tlv(const uint8_t *cdata, size_t cdata_len, uint8_t **p, uint16_t *tag, size_t *tag_len, uint8_t **data) {
if (!p)
return 0;
if (!*p)
*p = (uint8_t *)cdata;
if (*p-cdata >= cdata_len)
return 0;
uint8_t tg = 0x0;
uint16_t tg = 0x0;
size_t tgl = 0;
tg = *(*p)++;
if ((tg & 0x1f) == 0x1f) {
tg <<= 8;
tg |= *(*p)++;
}
tgl = *(*p)++;
if (tgl == 0x82) {
tgl = *(*p)++ << 8;
@@ -581,6 +585,16 @@ int walk_tlv(const uint8_t *cdata, size_t cdata_len, uint8_t **p, uint8_t *tag,
return 1;
}
bool asn1_find_tag(const uint8_t *data, size_t data_len, uint16_t itag, size_t *tag_len, uint8_t **tag_data) {
uint16_t tag = 0x0;
uint8_t *p = NULL;
while (walk_tlv(data, data_len, &p, &tag, tag_len, tag_data)) {
if (itag == tag)
return true;
}
return false;
}
void init_rtc() {
rtc_init();