concrete/docs/dev/api/concrete.fhe.tfhers.bridge.md

module concrete.fhe.tfhers.bridge

Declaration of tfhers.Bridge class.

---

function new_bridge

new_bridge(circuit: 'Circuit') → Bridge

Create a TFHErs bridge from a circuit.

Args:

• circuit (Circuit): compiled circuit

Returns:

• Bridge: TFHErs bridge

---

class Bridge

TFHErs Bridge extend a Circuit with TFHErs functionalities.

input_types (List[Optional[TFHERSIntegerType]]): maps every input to a type. None means a non-tfhers type output_types (List[Optional[TFHERSIntegerType]]): maps every output to a type. None means a non-tfhers type

method __init__

__init__(
    circuit: 'Circuit',
    input_types: List[Optional[TFHERSIntegerType]],
    output_types: List[Optional[TFHERSIntegerType]]
)

---

method export_value

export_value(value: 'Value', output_idx: int) → bytes

Export a value as a serialized TFHErs integer.

Args:

• value (fhe.Value): value to export
• output_idx (int): the index corresponding to this output

Returns:

• bytes: serialized fheuint8

---

method import_value

import_value(buffer: bytes, input_idx: int) → Value

Import a serialized TFHErs integer as a Value.

Args:

• buffer (bytes): serialized integer
• input_idx (int): the index of the input expecting this value

Returns:

• fhe.Value: imported value

---

method keygen_with_initial_keys

keygen_with_initial_keys(
    input_idx_to_key_buffer: Dict[int, bytes],
    force: bool = False,
    seed: Optional[int] = None,
    encryption_seed: Optional[int] = None
)

Generate keys using an initial set of secret keys.

Args: force (bool, default = False): whether to generate new keys even if keys are already generated

seed (Optional[int], default = None): seed for private keys randomness

encryption_seed (Optional[int], default = None): seed for encryption randomness

• input_idx_to_key_buffer (Dict[int, bytes]): initial keys to set before keygen

Raises:

• RuntimeError: if failed to deserialize the key

---

method serialize_input_secret_key

serialize_input_secret_key(input_idx: int) → bytes

Serialize secret key used for a specific input.

Args:

• input_idx (int): input index corresponding to the key to serialize

Returns:

• bytes: serialized key