EncryptionNonce

12-byte AES-GCM encryption nonce

12-byte AES-GCM encryption nonce used for calldata encryption.

Definition

class EncryptionNonce(_SizedHexBytes):
    _size = 12

Construction

Parameter	Type	Required	Description
val	bytes | str | int	Yes	Hex string, raw bytes, or integer

Raises ValueError if length is not exactly 12 bytes.

Example

import os
from seismic_web3 import EncryptionNonce

nonce = EncryptionNonce(os.urandom(12))
print(nonce.to_0x_hex())

Auto-generation

In most cases you don't need to create nonces manually — the SDK generates a random one automatically. Only provide explicit nonces when testing with specific values or implementing custom encryption flows.

See Also

• SeismicElements — uses EncryptionNonce

• SeismicSecurityParams — optional nonce override

• Bytes32 — 32-byte type