The necessary code for MOST platforms is already in OpenSSL Look for OPENSSL_rdtsc in the crypto. directory. O.K. Not all platforms have this, but Sparc, x86/x86_64, s390, ppc, Itanium, apha,PA-RISC , ARM have some variant - admitted, quite a few hardware variants don't have a TSC, but that's determinable at runtime and you could drop back to gettimeofday() to cover those.
It's at least "better" than gettimeofday() for this purpose - i.e. most of the bits can't be determined from outside the box, it moves faster, and it's cheaper to read. Peter From: Stephan Mueller <smuel...@chronox.de> To: openssl-dev@openssl.org, Date: 16/01/2014 07:45 Subject: Re: [PATCH] Reseed PRNG on PID change Sent by: owner-openssl-...@openssl.org Am Donnerstag, 16. Januar 2014, 07:41:21 schrieb Peter Waltenberg: Hi Peter, >You have access to high speed event counters on most platforms now. >Where those are available, use them for reseed data instead of >gettimeofday(). Far higher resolution, far less performance impact. That implies, however, either hardware-specific code (i.e. special CPU instruction) or per operating system specific code (special system call, library call). Ciao Stephan ______________________________________________________________________ OpenSSL Project http://www.openssl.org Development Mailing List openssl-dev@openssl.org Automated List Manager majord...@openssl.org ______________________________________________________________________ OpenSSL Project http://www.openssl.org Development Mailing List openssl-dev@openssl.org Automated List Manager majord...@openssl.org
