Previously, this test was entirely a no-op as no vector in the NIST-KAT file has a precisely 20-byte key. Additionally, not every vector in the file is SHA1. The length field determines the hash under test, and is now decoded correctly. Finally, due to a limitation I didn't feel like fixing in cryptodev.py, MACs are truncated to 16 bytes in this test. With this change and the uncommitted D12437 (to allow key sizes other than those used in IPSec), the SHA tests in cryptotest.py actually test something and e.g. at least cryptosoft passes the test. Sponsored by: Dell EMC Isilon
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