Module: crypto_provider_cryptography

class x3dh.crypto_provider_cryptography.CryptoProviderImpl[source]

Bases: CryptoProvider

Cryptography provider based on the Python package cryptography.

async static hkdf_derive(hash_function, length, salt, info, key_material)[source]
Parameters:

  • hash_function (HashFunction) – The hash function to parameterize the HKDF with.

  • length (int) – The number of bytes to derive.

  • salt (bytes) – The salt input for the HKDF.

  • info (bytes) – The info input for the HKDF.

  • key_material (bytes) – The input key material to derive from.

Return type:

bytes

Returns:

The derived key material.