webadmin/pico-keys-sdk
1
0
Fork 0
mirror of https://github.com/polhenarejos/pico-keys-sdk synced 2026-06-03 03:43:00 +02:00
Code Issues Packages Projects Releases Wiki Activity

Moving some ASN1 procedures to a separate file.

Browse Source
This commit is contained in:
Pol Henarejos
2022-06-01 09:45:27 +02:00
parent 67efd73a96
commit 199095c204
7 changed files with 123 additions and 78 deletions
Download Patch File Download Diff File Expand all files Collapse all files

73
src/ccid/ccid2040.c
View File

@@ -529,79 +529,6 @@ void led_off_all() {
#endif
}
size_t asn1_len_tag(uint16_t tag, size_t len) {
size_t ret = 1+format_tlv_len(len, NULL)+len;
if (tag > 0x00ff)
return ret+1;
return ret;
}
int format_tlv_len(size_t len, uint8_t *out) {
if (len < 128) {
if (out)
*out = len;
return 1;
}
else if (len < 256) {
if (out) {
*out++ = 0x81;
*out++ = len;
}
return 2;
}
else {
if (out) {
*out++ = 0x82;
*out++ = (len >> 8) & 0xff;
*out++ = len & 0xff;
}
return 3;
}
return 0;
}
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;
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;
tgl |= *(*p)++;
}
else if (tgl == 0x81) {
tgl = *(*p)++;
}
if (tag)
*tag = tg;
if (tag_len)
*tag_len = tgl;
if (data)
*data = *p;
*p = *p+tgl;
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();