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magicSqr 16 Dec 2012, 17:15
Hi,
from http://software.intel.com/en-us/articles/intel-digital-random-number-generator-drng-software-implementation-guide 
If I run the following Code: format PE64 console entry start include '%fasminc%\win64ax.inc' ;************************************************************************************************** section '.text' code readable executable start: xor eax, eax cpuid bt ecx, 30 jnc .noGood .good: cinvoke printf, goodStr jmp .finished .noGood: cinvoke printf, noGoodStr .finished: rdrand eax invoke ExitProcess, 0 ;************************************************************************************************** section '.data' data readable writeable goodStr db "RDRAND available", 00 noGoodStr db "RDRAND not available", 00 ;************************************************************************************************** section '.idata' import data readable writeable library msvcrt, 'msvcrt.dll',\ kernel32, 'kernel32.dll' include '%fasminc%\api\Kernel32.inc' import msvcrt,\ printf, 'printf' I am told bit 30 is set so I have rdrand support but then the code crashes at the Code:
rdrand eax
Any ideas? thx |
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16 Dec 2012, 17:15 |
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magicSqr 16 Dec 2012, 17:57
thx loco, that was the problem. I should have eax = 1.
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16 Dec 2012, 17:57 |
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HaHaAnonymous 17 Dec 2012, 00:24
[ Post removed by author. ]
Last edited by HaHaAnonymous on 28 Feb 2015, 22:10; edited 1 time in total |
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17 Dec 2012, 00:24 |
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BAiC 31 Dec 2012, 23:10
fyi: you're executing the RDRAND opcode when the processor detects that it isn't supported. it falls through:
Code:
.noGood:
cinvoke printf, noGoodStr
.finished:
rdrand eax use something like: Code:
bt ecx, 30
jnc .noGood
cinvoke printf, goodStr
rdrand eax
invoke ExitProcess, 0
.noGood:
cinvoke printf, noGoodStr
invoke ExitProcess, 0 _________________ byte me. |
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31 Dec 2012, 23:10 |
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DOS386 07 Feb 2013, 08:32
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07 Feb 2013, 08:32 |
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