The patch delivered 1.45x for SHA256 and 1.3x for SHA512, compared to OpenSSL 1.0.1 (current at that time). At the very least, it showed (for the first time) to OpenSSL developers that much higher performance was achievable. The purpose of the patch was to demonstrate the benefit of the n-SMS method, therefore no additional optimizations were made to the OpenSSL “body” code itself.
The response to the patch submission could have better expressed some credit for that. Furthermore, the implementation in http://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=c4558efbf3a44a1b5e68dce46347dd3888db4760 is using 2-SMS for the AVX2 version. However, it forgets the due reference to http://rt.openssl.org/Ticket/Display.html?id=2784&user=guest&pass=guest(and by now, also: S. Gueron, V.Krasnov, “Parallelizing message schedules to accelerate the computations of hash functions”, Journal of Cryptographic Engineering November 2012, Volume 2, Issue 4, pp 241-253). This paper was about n-SMS where n is the number of data blocks whose “message schedule” is processed in parallel using SIMD instructions. It is based on a general observation on Davies-Meyer hashes, and specifically, the values n=2, 3, 4 are mentioned as options there. The paper gave an ** example** of 4-SMS and 8-SMS, and the patch executed 4-SMS for SHA256, which we thought was a good choice. Using 2-SMS, mixed with some other techniques (BTW, due to some other author) does not exempt from proper citing in the Git version that would enter the library. Regards, Shay Gueron ************************** Professor Shay Gueron Department of Mathematics University of Haifa Haifa 31905 ISRAEL s...@math.haifa.ac.il ************************** -----Original Message----- From: Andy Polyakov via RT [mailto:r...@openssl.org] Sent: Saturday, March 30, 2013 12:11 To: Gueron, Shay Subject: [openssl.org #2784] Resolved: [PATCH] Eefficient implementations of SHA256 and SHA512, using the Simultaneous Message Scheduling method According to our records, your request has been resolved. If you have any further questions or concerns, please respond to this message. --------------------------------------------------------------------- ______________________________________________________________________ OpenSSL Project http://www.openssl.org Development Mailing List openssl-dev@openssl.org Automated List Manager majord...@openssl.org
