Support for SHAKE256, based on patch by Daiki Ueno.
* shake256.c (sha3_256_shake): New file and function. * Makefile.in (nettle_SOURCES): Add shake256.c. * testsuite/testutils.c (test_hash): Allow arbitrary digest size, if hash->digest_size == 0. * testsuite/shake.awk: New script to extract test vectors. * testsuite/Makefile.in (TS_NETTLE_SOURCES): Add shake256-test.c. (DISTFILES): Add shake.awk.
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