Revision 1 introduces streaming interfaces for extendable-output function (XOF) computations, which allow applications to process input and request output incrementally without knowing the total input or output length in advance. From the Note to Reviewers (p. v): The Keccak-derived functions in this recommendation have been updated to describe a streaming mode of access that provides full XOF functionality. This involves calls to three functions: INIT, ABSORB, and SQUEEZE. Illustrative pseudocode is provided for the streaming interface, but the correct behavior of all streaming modes is defined in terms of the corresponding single-call interface to the functions. The single-call interfaces