#include "subghz_protocol_keeloq_common.h"

#include <furi.h>

#include <m-string.h>
#include <m-array.h>

/** Simple Learning Encrypt
 * @param data - 0xBSSSCCCC, B(4bit) key, S(10bit) serial&0x3FF, C(16bit) counter
 * @param key - manufacture (64bit)
 * @return keelog encrypt data
 */
inline uint32_t subghz_protocol_keeloq_common_encrypt(const uint32_t data, const uint64_t key) {
    uint32_t x = data, r;
    for(r = 0; r < 528; r++)
        x = (x >> 1) ^ ((bit(x, 0) ^ bit(x, 16) ^ (uint32_t)bit(key, r & 63) ^
                         bit(KEELOQ_NLF, g5(x, 1, 9, 20, 26, 31)))
                        << 31);
    return x;
}

/** Simple Learning Decrypt
 * @param data - keelog encrypt data
 * @param key - manufacture (64bit)
 * @return 0xBSSSCCCC, B(4bit) key, S(10bit) serial&0x3FF, C(16bit) counter
 */
inline uint32_t subghz_protocol_keeloq_common_decrypt(const uint32_t data, const uint64_t key) {
    uint32_t x = data, r;
    for(r = 0; r < 528; r++)
        x = (x << 1) ^ bit(x, 31) ^ bit(x, 15) ^ (uint32_t)bit(key, (15 - r) & 63) ^
            bit(KEELOQ_NLF, g5(x, 0, 8, 19, 25, 30));
    return x;
}

/** Normal Learning
 * @param data - serial number (28bit)
 * @param key - manufacture (64bit)
 * @return manufacture for this serial number (64bit)
 */
inline uint64_t subghz_protocol_keeloq_common_normal_learning(uint32_t data, const uint64_t key) {
    uint32_t k1, k2;

    data &= 0x0FFFFFFF;
    data |= 0x20000000;
    k1 = subghz_protocol_keeloq_common_decrypt(data, key);

    data &= 0x0FFFFFFF;
    data |= 0x60000000;
    k2 = subghz_protocol_keeloq_common_decrypt(data, key);

    return ((uint64_t)k2 << 32) | k1; // key - shifrovanoya
}

/** Secure Learning
 * @param data - serial number (28bit)
 * @param seed - serial number (32bit)
 * @param key - manufacture (64bit)
 * @return manufacture for this serial number (64bit)
 */

inline uint64_t subghz_protocol_keeloq_common_secure_learning(
    uint32_t data,
    uint32_t seed,
    const uint64_t key) {
    uint32_t k1, k2;

    data &= 0x0FFFFFFF;
    k1 = subghz_protocol_keeloq_common_decrypt(data, key);
    k2 = subghz_protocol_keeloq_common_decrypt(seed, key);

    return ((uint64_t)k1 << 32) | k2;
}