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/*
* Copyright (c) 2018 Yubico AB. All rights reserved.
* Use of this source code is governed by a BSD-style
* license that can be found in the LICENSE file.
*/
#include "fido.h"
static int
get_key_len(uint8_t tag, uint8_t *key, size_t *key_len)
{
*key = tag & 0xfc;
if ((*key & 0xf0) == 0xf0) {
fido_log_debug("%s: *key=0x%02x", __func__, *key);
return (-1);
}
*key_len = tag & 0x3;
if (*key_len == 3) {
*key_len = 4;
}
return (0);
}
static int
get_key_val(const void *body, size_t key_len, uint32_t *val)
{
const uint8_t *ptr = body;
switch (key_len) {
case 0:
*val = 0;
break;
case 1:
*val = ptr[0];
break;
case 2:
*val = (uint32_t)((ptr[1] << 8) | ptr[0]);
break;
default:
fido_log_debug("%s: key_len=%zu", __func__, key_len);
return (-1);
}
return (0);
}
int
fido_hid_get_usage(const uint8_t *report_ptr, size_t report_len,
uint32_t *usage_page)
{
const uint8_t *ptr = report_ptr;
size_t len = report_len;
while (len > 0) {
const uint8_t tag = ptr[0];
ptr++;
len--;
uint8_t key;
size_t key_len;
uint32_t key_val;
if (get_key_len(tag, &key, &key_len) < 0 || key_len > len ||
get_key_val(ptr, key_len, &key_val) < 0) {
return (-1);
}
if (key == 0x4) {
*usage_page = key_val;
}
ptr += key_len;
len -= key_len;
}
return (0);
}
int
fido_hid_get_report_len(const uint8_t *report_ptr, size_t report_len,
size_t *report_in_len, size_t *report_out_len)
{
const uint8_t *ptr = report_ptr;
size_t len = report_len;
uint32_t report_size = 0;
while (len > 0) {
const uint8_t tag = ptr[0];
ptr++;
len--;
uint8_t key;
size_t key_len;
uint32_t key_val;
if (get_key_len(tag, &key, &key_len) < 0 || key_len > len ||
get_key_val(ptr, key_len, &key_val) < 0) {
return (-1);
}
if (key == 0x94) {
report_size = key_val;
} else if (key == 0x80) {
*report_in_len = (size_t)report_size;
} else if (key == 0x90) {
*report_out_len = (size_t)report_size;
}
ptr += key_len;
len -= key_len;
}
return (0);
}
fido_dev_info_t *
fido_dev_info_new(size_t n)
{
return (calloc(n, sizeof(fido_dev_info_t)));
}
void
fido_dev_info_free(fido_dev_info_t **devlist_p, size_t n)
{
fido_dev_info_t *devlist;
if (devlist_p == NULL || (devlist = *devlist_p) == NULL)
return;
for (size_t i = 0; i < n; i++) {
const fido_dev_info_t *di;
di = &devlist[i];
free(di->path);
free(di->manufacturer);
free(di->product);
}
free(devlist);
*devlist_p = NULL;
}
const fido_dev_info_t *
fido_dev_info_ptr(const fido_dev_info_t *devlist, size_t i)
{
return (&devlist[i]);
}
const char *
fido_dev_info_path(const fido_dev_info_t *di)
{
return (di->path);
}
int16_t
fido_dev_info_vendor(const fido_dev_info_t *di)
{
return (di->vendor_id);
}
int16_t
fido_dev_info_product(const fido_dev_info_t *di)
{
return (di->product_id);
}
const char *
fido_dev_info_manufacturer_string(const fido_dev_info_t *di)
{
return (di->manufacturer);
}
const char *
fido_dev_info_product_string(const fido_dev_info_t *di)
{
return (di->product);
}
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