hkd32 is a Rust library which implements a hierarchical deterministic
symmetric key derivation construction inspired by
BIP-0032: Hierarchical Deterministic Wallets.
It can be used to deterministically derive a hierarchy of symmetric keys
from initial keying material (or when the mnemonic feature is enabled,
through a 24-word [BIP39] passphrase) by repeatedly applying the
Hash-based Message Authentication Code (HMAC).
This construction is specialized for deriving 32-byte (256-bit) keys from an initial 32-bytes of input key material.
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