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aea.crypto.base

Abstract module wrapping the public and private key cryptography and ledger api.

Crypto Objects

class Crypto(Generic[EntityClass],  ABC)

Base class for a crypto object.

__init__

 | __init__(private_key_path: Optional[str] = None, password: Optional[str] = None, **kwargs: Any, ,) -> None

Initialize the crypto object.

The actual behaviour of this constructor is determined by the abstract methods 'generate_private_key()' and 'load_private_key_from_path(). Either way, the entity object will be accessible as a property.

Arguments:

  • private_key_path: the path to the private key. If None, the key will be generated by 'generate_private_key()'. If not None, the path will be processed by 'load_private_key_from_path()'.
  • password: the password to encrypt/decrypt the private key.
  • kwargs: keyword arguments.

generate_private_key

 | @classmethod
 | @abstractmethod
 | generate_private_key(cls) -> EntityClass

Generate a private key.

Returns:

the entity object. Implementation dependent.

load_private_key_from_path

 | @classmethod
 | @abstractmethod
 | load_private_key_from_path(cls, file_name: str, password: Optional[str] = None) -> EntityClass

Load a private key in hex format for raw private key and json format for encrypted private key from a file.

Arguments:

  • file_name: the path to the hex/json file.
  • password: the password to encrypt/decrypt the private key.

Returns:

the entity object.

entity

 | @property
 | entity() -> EntityClass

Return an entity object.

Returns:

an entity object

private_key

 | @property
 | @abstractmethod
 | private_key() -> str

Return a private key.

Returns:

a private key string

public_key

 | @property
 | @abstractmethod
 | public_key() -> str

Return a public key.

Returns:

a public key string

address

 | @property
 | @abstractmethod
 | address() -> str

Return the address.

Returns:

an address string

sign_message

 | @abstractmethod
 | sign_message(message: bytes, is_deprecated_mode: bool = False) -> str

Sign a message in bytes string form.

Arguments:

  • message: the message to be signed
  • is_deprecated_mode: if the deprecated signing is used

Returns:

signature of the message in string form

sign_transaction

 | @abstractmethod
 | sign_transaction(transaction: JSONLike) -> JSONLike

Sign a transaction in dict form.

Arguments:

  • transaction: the transaction to be signed

Returns:

signed transaction

load

 | @classmethod
 | load(cls, private_key_file: str, password: Optional[str] = None) -> str

Load private key from file.

Arguments:

  • private_key_file: the file where the key is stored.
  • password: the password to encrypt/decrypt the private key.

Returns:

private_key in hex string format

dump

 | dump(private_key_file: str, password: Optional[str] = None) -> None

Dump private key to file.

Arguments:

  • private_key_file: the file where the key is stored.
  • password: the password to encrypt/decrypt the private key.

Returns:

None

encrypt

 | @abstractmethod
 | encrypt(password: str) -> str

Encrypt the private key and return in json.

Arguments:

  • private_key: the raw private key.
  • password: the password to decrypt.

Returns:

json string containing encrypted private key.

decrypt

 | @classmethod
 | @abstractmethod
 | decrypt(cls, keyfile_json: str, password: str) -> str

Decrypt the private key and return in raw form.

Arguments:

  • keyfile_json: json string containing encrypted private key.
  • password: the password to decrypt.

Returns:

the raw private key.

Helper Objects

class Helper(ABC)

Interface for helper class usable as Mixin for LedgerApi or as standalone class.

is_transaction_settled

 | @staticmethod
 | @abstractmethod
 | is_transaction_settled(tx_receipt: JSONLike) -> bool

Check whether a transaction is settled or not.

Arguments:

  • tx_digest: the digest associated to the transaction.

Returns:

True if the transaction has been settled, False o/w.

is_transaction_valid

 | @staticmethod
 | @abstractmethod
 | is_transaction_valid(tx: JSONLike, seller: Address, client: Address, tx_nonce: str, amount: int) -> bool

Check whether a transaction is valid or not.

Arguments:

  • tx: the transaction.
  • seller: the address of the seller.
  • client: the address of the client.
  • tx_nonce: the transaction nonce.
  • amount: the amount we expect to get from the transaction.

Returns:

True if the random_message is equals to tx['input']

get_contract_address

 | @staticmethod
 | @abstractmethod
 | get_contract_address(tx_receipt: JSONLike) -> Optional[str]

Get the contract address from a transaction receipt.

Arguments:

  • tx_receipt: the transaction digest

Returns:

the contract address if successful

generate_tx_nonce

 | @staticmethod
 | @abstractmethod
 | generate_tx_nonce(seller: Address, client: Address) -> str

Generate a unique hash to distinguish transactions with the same terms.

Arguments:

  • seller: the address of the seller.
  • client: the address of the client.

Returns:

return the hash in hex.

get_address_from_public_key

 | @classmethod
 | @abstractmethod
 | get_address_from_public_key(cls, public_key: str) -> str

Get the address from the public key.

Arguments:

  • public_key: the public key

Returns:

str

recover_message

 | @classmethod
 | @abstractmethod
 | recover_message(cls, message: bytes, signature: str, is_deprecated_mode: bool = False) -> Tuple[Address, ...]

Recover the addresses from the hash.

Arguments:

  • message: the message we expect
  • signature: the transaction signature
  • is_deprecated_mode: if the deprecated signing was used

Returns:

the recovered addresses

recover_public_keys_from_message

 | @classmethod
 | @abstractmethod
 | recover_public_keys_from_message(cls, message: bytes, signature: str, is_deprecated_mode: bool = False) -> Tuple[str, ...]

Get the public key used to produce the signature of the message

Arguments:

  • message: raw bytes used to produce signature
  • signature: signature of the message
  • is_deprecated_mode: if the deprecated signing was used

Returns:

the recovered public keys

get_hash

 | @staticmethod
 | @abstractmethod
 | get_hash(message: bytes) -> str

Get the hash of a message.

Arguments:

  • message: the message to be hashed.

Returns:

the hash of the message.

is_valid_address

 | @classmethod
 | @abstractmethod
 | is_valid_address(cls, address: Address) -> bool

Check if the address is valid.

Arguments:

  • address: the address to validate

load_contract_interface

 | @classmethod
 | @abstractmethod
 | load_contract_interface(cls, file_path: Path) -> Dict[str, str]

Load contract interface.

Arguments:

  • file_path: the file path to the interface

Returns:

the interface

LedgerApi Objects

class LedgerApi(Helper,  ABC)

Interface for ledger APIs.

api

 | @property
 | @abstractmethod
 | api() -> Any

Get the underlying API object.

This can be used for low-level operations with the concrete ledger APIs. If there is no such object, return None.

get_balance

 | @abstractmethod
 | get_balance(address: Address) -> Optional[int]

Get the balance of a given account.

This usually takes the form of a web request to be waited synchronously.

Arguments:

  • address: the address.

Returns:

the balance.

get_state

 | @abstractmethod
 | get_state(callable_name: str, *args: Any, **kwargs: Any) -> Optional[JSONLike]

Call a specified function on the underlying ledger API.

This usually takes the form of a web request to be waited synchronously.

Arguments:

  • callable_name: the name of the API function to be called.
  • args: the positional arguments for the API function.
  • kwargs: the keyword arguments for the API function.

Returns:

the ledger API response.

get_transfer_transaction

 | @abstractmethod
 | get_transfer_transaction(sender_address: Address, destination_address: Address, amount: int, tx_fee: int, tx_nonce: str, **kwargs: Any, ,) -> Optional[JSONLike]

Submit a transfer transaction to the ledger.

Arguments:

  • sender_address: the sender address of the payer.
  • destination_address: the destination address of the payee.
  • amount: the amount of wealth to be transferred.
  • tx_fee: the transaction fee.
  • tx_nonce: verifies the authenticity of the tx

Returns:

the transfer transaction

send_signed_transaction

 | @abstractmethod
 | send_signed_transaction(tx_signed: JSONLike) -> Optional[str]

Send a signed transaction and wait for confirmation.

Use keyword arguments for the specifying the signed transaction payload.

Arguments:

  • tx_signed: the signed transaction

get_transaction_receipt

 | @abstractmethod
 | get_transaction_receipt(tx_digest: str) -> Optional[JSONLike]

Get the transaction receipt for a transaction digest.

Arguments:

  • tx_digest: the digest associated to the transaction.

Returns:

the tx receipt, if present

get_transaction

 | @abstractmethod
 | get_transaction(tx_digest: str) -> Optional[JSONLike]

Get the transaction for a transaction digest.

Arguments:

  • tx_digest: the digest associated to the transaction.

Returns:

the tx, if present

get_contract_instance

 | @abstractmethod
 | get_contract_instance(contract_interface: Dict[str, str], contract_address: Optional[str] = None) -> Any

Get the instance of a contract.

Arguments:

  • contract_interface: the contract interface.
  • contract_address: the contract address.

Returns:

the contract instance

get_deploy_transaction

 | @abstractmethod
 | get_deploy_transaction(contract_interface: Dict[str, str], deployer_address: Address, **kwargs: Any, ,) -> Optional[JSONLike]

Get the transaction to deploy the smart contract.

Arguments:

  • contract_interface: the contract interface.
  • deployer_address: The address that will deploy the contract. :returns tx: the transaction dictionary.

update_with_gas_estimate

 | @abstractmethod
 | update_with_gas_estimate(transaction: JSONLike) -> JSONLike

Attempts to update the transaction with a gas estimate

Arguments:

  • transaction: the transaction

Returns:

the updated transaction

FaucetApi Objects

class FaucetApi(ABC)

Interface for testnet faucet APIs.

get_wealth

 | @abstractmethod
 | get_wealth(address: Address, url: Optional[str] = None) -> None

Get wealth from the faucet for the provided address.

Arguments:

  • address: the address.
  • url: the url

Returns:

None