int ecdsa_get_params(u32 type, u8 *p, u8 *a, u8 *b, u8 *N, u8 *Gx, u8 *Gy)
{
static u8 tbl[64 * 121];
char path[256];
u32 offset;
if (type >= 64)
return -1;
if (key_build_path(path) < 0)
return -1;
strncat(path, "/curves", sizeof path);
if (key_read(path, sizeof tbl, tbl) < 0)
return -1;
offset = type * 121;
memcpy_inv(p, tbl + offset + 0, 20);
memcpy_inv(a, tbl + offset + 20, 20);
memcpy_inv(b, tbl + offset + 40, 20);
memcpy_inv(N, tbl + offset + 60, 21);
memcpy_inv(Gx, tbl + offset + 81, 20);
memcpy_inv(Gy, tbl + offset + 101, 20);
return 0;
}
static int toh_eeprom_read_entry(struct toh_data *toh, void *dest,
char *entry_name)
{
int i = toh_find_entry(toh, entry_name);
ssize_t count;
char temp[toh->eeprom[i].size];
count = toh_eeprom_read(toh, temp, toh->eeprom[i].offset,
toh->eeprom[i].size);
if (count != toh->eeprom[i].size) {
dev_err(toh->dev, "Could not read entry %s\n", entry_name);
return count;
}
memcpy_inv(dest, temp, toh->eeprom[i].size);
return 0;
}
static ssize_t toh_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct platform_device *pdev =
container_of(dev, struct platform_device, dev);
struct toh_data *toh = platform_get_drvdata(pdev);
char ebuf[8];
char inv_buf[8];
int i = 0;
ssize_t count;
if (!toh->macc) {
dev_err(dev, "No memory accessor set\n");
return -ENXIO;
}
memset(ebuf, 0, 8);
memset(inv_buf, 0, 8);
/* find the index for which attribute this call is meant to */
while (&toh->attrs[i] != attr)
i++;
count = toh_eeprom_read(toh, ebuf, toh->eeprom[i].offset,
toh->eeprom[i].size);
if (count != toh->eeprom[i].size) {
dev_err(dev, "Could not read eeprom\n");
return count;
}
/* Reverse byte order of the buffer to make it cast properly to u64 */
memcpy_inv(inv_buf, ebuf, toh->eeprom[i].size);
return snprintf(buf, PAGE_SIZE, "%llu\n", *(u64 *)inv_buf);
}
