BuildBasicFilter builds a basic GCS filter from a block.

DeriveKey is a utility function that derives a key from a chainhash.Hash by truncating the bytes of the hash to the appopriate key size.

GetFilterHash returns the double-SHA256 of the filter.

MakeHeaderForFilter makes a filter chain header for a filter, given the filter and the previous filter chain header.

RandomKey is a utility function that returns a cryptographically random [gcs.KeySize]byte usable as a key for a GCS filter.

WithKey creates a GCS with specified key.

WithKeyHash creates a GCS with key derived from the specified chainhash.Hash.

WithKeyHashPM creates a GCS with key derived from the specified chainhash.Hash and the passed probability.

WithKeyHashPNM creates a GCS with key derived from the specified chainhash.Hash and the passed probability and estimated filter size.

WithKeyPM creates a GCS with specified key and the passed probability.

WithKeyPNM creates a GCS with specified key and the passed probability, modulus and estimated filter size.

WithRandomKey creates a GCS with a cryptographically random key.

WithRandomKeyPM creates a GCS with a cryptographically random key and the passed probability.

WithRandomKeyPNM creates a GCS with a cryptographically random key and the passed probability and estimated filter size.

DefaultM is the default value used for the hash range.

DefaultP is the default collision probability (2^-19).

GCS is a utility class that makes building GCS filters convenient.