Umfrage/Architekturfrage zur DEC

[Kas Ob.]

Ok Now i see it, it is doing the clipping/clamping on 32bit
///* r &= 0xffffffc0ffffffc0ffffffc0fffffff */

[rabatscher]

Here a first version that includes poly1305 to the chacha cipher - tests according to rfc7539 are included.
The code is far from beeing ready but it's a start
There are also some changes to the base classes... so if one could take a look at it would be great...

Still - I guess if the Mr. Humm likes the changes I need to figure on how to create a pull request on that lib....

[TurboMagic]

Zitat von rabatscher:

Here a first version that includes poly1305 to the chacha cipher - tests according to rfc7539 are included.
The code is far from beeing ready but it's a start
There are also some changes to the base classes... so if one could take a look at it would be great...

Still - I guess if the Mr. Humm likes the changes I need to figure on how to create a pull request on that lib....

Well, somebody is creating security risks by leaking real names of forum users
I think the other version presented in this thread only works on x86/x64 systems because of ASM usage.
Correct? While I like the use of AVX code to speed things up any implementation which shall get added to DEC
one daymust also have a pure pascal implementation for cross platform compatibility.

Oh and about autodetection whether a CPU supports AVX: somewhere in system.pas is some code available for
querying CPUID and from that one can find out if it supports AVX/AVX2.

Oh and since the current minimum supported Delphi version is 10.1 any version of Delphi prior to the one with
built in AVX asm support (11.0 Alexandria) needs to use the pure Pascal implementation.

That's my take for this evening on this one.

[rabatscher]

Ups sorry...

The chacha avx version from my mrmath library actually handles that quite well - the assembler routines were converted to db statements
if the assembler does not know the statements... SSE is known to Delhi since I guess D2010 so these can be left there...

Is the library used on non x86/x64 platforms too? If thats the case the endianess will be a challenge

I also have had troubles to not use a specialized class - the initialization of the poly1305 class is quite chacha specific (half of a block is dismissed,
the counter is increased). What do you think about that?

[TurboMagic]

Hello,

not sure what to think about the last question, but the DEC library
is cross platform compatible since V6.0. That was the biggest new feature
back then.

If you look into DECOptions.inc you'll also find the possibility to turn the
use of ASM for x86 on or off via define.