Encryption

DMPCrypto

DMPCrypto(account_number: int, remote_key: str = '')

LFSR encryption for DMP user codes.

Initialize crypto with account number and optional remote key.

Parameters:

Name	Type	Description	Default
account_number	int	5-digit account number (1-99999)	required
remote_key	str	Remote key for authentication (not used for Entree connections)	''

LFSR_CONTROL_STRING class-attribute instance-attribute

LFSR_CONTROL_STRING: Final[str] = '----2222222223333'

account_number instance-attribute

account_number = account_number

remote_key instance-attribute

remote_key = remote_key

encrypt_string

encrypt_string(string_to_encrypt: str) -> str

Encrypt a string using LFSR algorithm.

The control string determines which positions are encrypted: - '-': Skip (no encryption) - '2': Encrypt 2-char hex value - '3': Encrypt 3-digit decimal value

Parameters:

Name	Type	Description	Default
string_to_encrypt	str	String to encrypt (typically user code + data)	required

Returns:

Type	Description
str	Encrypted string

decrypt_string

decrypt_string(string_to_decrypt: str) -> str

Decrypt a string using LFSR algorithm.

Since LFSR XOR is symmetric, decryption is identical to encryption.

Parameters:

Name	Type	Description	Default
string_to_decrypt	str	String to decrypt	required

Returns:

Type	Description
str	Decrypted string

encrypt_user_code

encrypt_user_code(user_code: str) -> str

Encrypt a user code for use in disarm commands.

Parameters:

Name	Type	Description	Default
user_code	str	4-6 digit user code	required

Returns:

Type	Description
str	Encrypted user code