Module common 

Common cryptographic utility functions.

This module provides implementations of various cryptographic operations used throughout the VRF schemes, including challenge generation, nonce derivation, and delinearization.

Structs

ExactChain

Wrapper around Chain that implements ExactSizeIterator.

Constants

CHALLENGE_LEN

Challenge encoding length in bytes (128-bit security).

Functions

challenge

Challenge generation inspired by RFC-9381 section 5.4.3.

challenge_scalar

expanded_scalar_len

Number of bytes to squeeze for an unbiased scalar via from_le_bytes_mod_order.

nonce

Deterministic nonce generation inspired by RFC-8032 section 5.1.6.

nonce_scalar

point_to_hash

Point-to-hash inspired by RFC-9381 section 5.2.