HDD Sheriff 9 bootrom.bin password patch generator

sheriff_poc.c

#include <stdio.h>
#include <string.h>

long long int setPassword(char *password, int pwdLength) {
    if (pwdLength <= 0) return 0xFFFFFFFFLL;

    unsigned int result = -1;

    unsigned short encryptShifter;
    unsigned short encryptedChar;
    char lastEncryptedChar;
    char lowEncryptedCharBit;

    int lastResult = -1;
    int shiftedLastResult = -1;

    int index, encryptCount;
    for (index = 0; index < pwdLength; index++) {
        encryptedChar = (password[index] ^ result) & 0xff;
        shiftedLastResult = lastResult >> 8;

        encryptShifter = 0;
        for (encryptCount = 0; encryptCount < 8; encryptCount++) {
            lastEncryptedChar = encryptedChar;

            lowEncryptedCharBit = encryptShifter & 1;
            encryptShifter >>= 1;
            encryptedChar = (encryptedChar >> 1) | (lowEncryptedCharBit << 15);
            if (lastEncryptedChar % 2 != 0) {
                encryptedChar ^= 0x8320;
                encryptShifter ^= 0xEDB8;
            }
        }

        result = ((encryptedChar ^ shiftedLastResult) & 0xffff) | (((encryptShifter ^ (shiftedLastResult >> 16)) & 0xffff) << 16);

        lastResult = result;
    }

    return result;
}

int main() {
    char password[32];

    printf("Input password (max length: 32): ");
    scanf("%s", password);

    long long int res = setPassword(password, strlen(password));

    printf("result: %lld\n", res);

    return 0;
}