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This adds a ssh_hashalg defining SHAKE256 with a 32-byte output, in addition to the 114-byte output we already have. Also, it defines a new API for using SHAKE128 and SHAKE256 in the more general form of an extendable output function, which is to say that you still have to put in all the input before reading any output, but once you start reading output you can just keep going until you have enough. Both of these will be needed in an upcoming commit implementing ML-KEM.