I just ran a speed test on my laptop. Here are some relevant excerpts:
Cipher Key Size Block Size Enc KB/sec Dec KB/sec
-------- -------- ---------- ---------- ----------
IDEA 128 bits 8 bytes 24032.09 24030.66
3DES 192 bits 8 bytes 10387.67 10399.30
CAST5 128 bits 8 bytes 29331.17 29459.49
Twofish 256 bits 16 bytes 20233.63 19185.82
AES-128 128 bits 16 bytes 44100.23 46266.98
AES-192 192 bits 16 bytes 39731.33 41228.87
AES-256 256 bits 16 bytes 36017.95 37302.43
Blowfish 128 bits 8 bytes 35347.34 38311.22
Comparing AES-128 and AES-256, encrypt speed is 1.2243959x and
decrypt is 1.2403208x. So that makes my lick-your-finger-and-stick-it-
in-the-wind rule of thumb of 20% slower okay. I'll try to say 20-25%
in the future.
Of course, though, implementation matters a lot. I'm running a PPC-32
machine. You'll get different answers on an ia32, and different ones
an AMD64.
Jon
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