Thomas Koenig wrote: > Using the reference you provided, I got around three Megabytes/ CPU > second on a P133 with RIPEMD-160 (using pgcc -O6, I confess :-) How > fast is SHA-1 in comprarison?
The RIPEMD folks have been carefully tweaking Pentium hashing times. A speed chart is available at http://www.esat.kuleuven.ac.be/~bosselae/ Here are their results on a P90: Hash functions Size (bytes) Cycles Mbit/sec Mbyte/sec MD4 1186 241 191.2 23.90 MD5 1719 345 133.6 16.70 RIPEMD 2291 485 95.0 11.88 RIPEMD-128 2941 597 77.2 9.65 SHA-1 4079 837 55.1 6.88 RIPEMD-160 4801 1016 45.4 5.67 Block ciphers Cycles Mbit/sec Mbyte/sec DES 351 16.4 2.05 DES key setup 686 7.3 0.91 IDEA 590 9.76 1.22 Square 324 35.56 4.45 Table 1: Performance of my assembly language implementations of some cryptographic algorithms on a 90 MHz Pentium using a 32-bit flat memory model. Due to the register limitations of the x86 architecture (you only have 7 registers), 160-bit hashes (with 5 active variables) suffer some extreme regsiter pressure, making it hard to schedule the code optimally. There are two ways to do SHA-1: with the "key scheduling" in a separate pre-pass, and integrated with the rounds. Which is better depends on a lot of things, including how many registers you have. (With enough, you can just load the entire input block into 16 registers and not worry about anything else.) I don't know which is used above. If you want bigger hashes, you can always look at HAVAL (256 bits)... -- -Colin -- TO UNSUBSCRIBE FROM THIS MAILING LIST: e-mail the word "unsubscribe" to [EMAIL PROTECTED] . Trouble? e-mail to [EMAIL PROTECTED] .
