Module hkdf_sha1 

hkdf-sha1 derivation parameterization: HKDF over SHA-1, for compatibility with existing protocols that fix it. The construction is not affected by SHA-1’s collision attacks (HKDF relies on HMAC’s PRF property), but prefer hkdf_sha2 where the protocol is yours to choose.

The Ikm resource and its import stay hkdf’s, so one imported secret can parameterize derivations over either hash family.

Functions

prepare

Parameterize an HKDF-SHA-1 derivation over imported keying material. See hkdf_sha2::prepare for the salt and info contracts.

prepare_from

Chain an HKDF-SHA-1 derivation from another derivation’s output. See hkdf_sha2::prepare_from.