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Saflok - creation year is limited to 7 bits

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This commit is contained in:
Henry Gabryjelski
2025-11-17 01:27:32 -08:00
parent 3bf51b1fd4
commit 02056c9515
1 changed files with 4 additions and 4 deletions
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client/src/cmdhfsaflok.c
+4 -4
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@@ -242,21 +242,21 @@ static void insert_bits(saflok_mfc_data_t *data, size_t start_bit, size_t num_bi
#if 1 // helpers for get/set_saflok_mfc_card_creation_date() ... do not call these directly as does not validate...
static inline uint16_t _get_saflok_mfc_card_creation_year_impl(const saflok_mfc_data_t *data) {
uint8_t creation_year_bits_high = (data->raw[14] & 0xF0u);
uint8_t creation_year_bits_high = (data->raw[14] & 0x70u);
uint8_t creation_year_bits_low = (data->raw[11] & 0xF0u) >> 4;
uint8_t creation_year_bits = creation_year_bits_high | creation_year_bits_low;
uint16_t creation_year = 1980u + creation_year_bits; // automatically extends to uint16_t
return creation_year;
}
static inline bool _set_saflok_mfc_card_creation_year_impl(saflok_mfc_data_t *data, uint16_t year) {
if (year < 1980u || year > (1980u+0xFFu)) {
if (year < 1980u || year > (1980u+0x7Fu)) {
PrintAndLogEx(ERR, _RED_("ERROR:") " year out of range (%u)\n", year);
return false;
}
uint16_t year_bits = year - 1980u;
uint8_t creation_year_bits_high = year_bits & 0xF0u;
uint8_t creation_year_bits_high = year_bits & 0x70u;
uint8_t creation_year_bits_low = (year_bits & 0x0Fu) << 4;
data->raw[14] = (data->raw[14] & 0x0Fu) | creation_year_bits_high;
data->raw[14] = (data->raw[14] & 0x8Fu) | creation_year_bits_high;
data->raw[11] = (data->raw[11] & 0x0Fu) | creation_year_bits_low;
return true;
}