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2004 Nov 30
1
Performance problems
Some of you may recall that I have been working on building a box to
convert H323 to SIP. After a significant amount of outside help and
slicing and dicing of the ohh323 code to get it to compile on AMD64 we
finally got it working. Now we are working on improving the performance.
This box takes H323 from one device and converts to SIP and spits it back
out to another device. The codec is g729 but
2009 Oct 30
30
Truncating SHA2 hashes vs shortening a MAC for ZFS Crypto
For the encryption functionality in the ZFS filesystem we use AES in CCM
or GCM mode at the block level to provide confidentiality and
authentication. There is also a SHA256 checksum per block (of the
ciphertext) that forms a Merkle tree of all the blocks in the pool.
Note that I have to store the full IV in the block. A block here is a
ZFS block which is any power of two from 512 bytes to