crypto:crypto_data

crypto_data_context(+Data, +Context0, -Context) is det: Context0 is an existing computation context, and Context is the new context after hashing Data in addition to the previously hashed data. Context0 may be produced by a prior invocation of either crypto_context_new/2 or crypto_data_context/3 itself.
This predicate allows a hash to be computed in chunks, which may be important while working with Metalink (RFC 5854), BitTorrent or similar technologies, or simply with big files.