Perry E. Metzger said:
"Peter Trei" writes:
The fastest general purpose, freely available des implementation I'm aware of is libdes. by Eric Young. With this, I can do a set_key in 15.8 us, and an ecb_encrypt in 95 us/block. That adds up to about 9,000 keytests/sec (this is on a 90 MHz P5, running NT).
I'll point out that like most DES implementations, Eric's tries to spend a lot of time in key setup to save time later on in encryption/decryption. This tradeoff would probably be very different if you didn't plan on trying more than one or two blocks of decryption after getting a key.
For instance if you had a DES encrypted gzipped file. The first 2 bytes plaintext will be Ox1f8b. You'd only have to try to fully decrypt 1 out of 65535 keys. -- Kevin L. Prigge | "I rarely saw people sitting at Systems Software Programmer | computers producing real code Internet Enterprise - OIT | wearing ties." - Philippe Kahn University of Minnesota | (speech at Software Development '90)