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beef up testing.
Buffer underflows could occur when:
- decrypting data > internal buffer size in output stream (input stream was fixed in prior commit)
- packet mode AE cipher (e.g. CCM) is used with a data size > internal buffer size (since all output is buffered)
Buffer is now sized appropriately to every cipher operation immediately prior to it (using getUpdateOutputSize/getOutputSize as appropriate) in both streams.
Tests now run over boundaries of various block/buffer sizes to try to expose issues (0, 64 bit block, 128 bit block, 1K, 2K, 4K).
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