read_buf_from_file
uchar_t *read_buf_from_file(char *, uint32_t *);
pac_buf = read_buf_from_file(pac_file, &buflen);
read_buf_from_file(chall_file, &user_info.lg_challenge_key.len);
read_buf_from_file(nt_file, &user_info.lg_nt_password.len);
read_buf_from_file(lm_file, &user_info.lg_lm_password.len);