mirror of
https://github.com/henrydcase/nobs.git
synced 2024-11-25 16:41:32 +00:00
Kris Kwiatkowski
08f7315b64
* CTR-DRBG doesn't call "NewCipher" for block encryption * Changes API of CTR-DRBG, so that read operation implementes io.Reader Benchmark results: ---------------------- benchmark old ns/op new ns/op delta BenchmarkInit-4 1118 3579 +220.13% BenchmarkRead-4 5343 14589 +173.05% benchmark old allocs new allocs delta BenchmarkInit-4 15 0 -100.00% BenchmarkRead-4 67 0 -100.00% benchmark old bytes new bytes delta BenchmarkInit-4 1824 0 -100.00% BenchmarkRead-4 9488 0 -100.00%
34 lines
924 B
Go
34 lines
924 B
Go
// +build amd64,!noasm
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// Sets capabilities flags for x86 according to information received from
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// CPUID. It was written in accordance with
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// "Intel® 64 and IA-32 Architectures Developer's Manual: Vol. 2A".
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// https://www.intel.com/content/www/us/en/architecture-and-technology/64-ia-32-architectures-software-developer-vol-2a-manual.html
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package utils
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// Performs CPUID and returns values of registers
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// go:nosplit
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func cpuid(eaxArg, ecxArg uint32) (eax, ebx, ecx, edx uint32)
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// Returns true in case bit 'n' in 'bits' is set, otherwise false
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func bitn(bits uint32, n uint8) bool {
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return (bits>>n)&1 == 1
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}
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func init() {
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// CPUID returns max possible input that can be requested
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max, _, _, _ := cpuid(0, 0)
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if max < 7 {
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return
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}
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_, ecx, _, _ := cpuid(1, 0)
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X86.HasAES = bitn(ecx, 25)
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_, ebx, _, _ := cpuid(7, 0)
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X86.HasBMI2 = bitn(ebx, 8)
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X86.HasADX = bitn(ebx, 19)
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X86.HasRDSEED = bitn(ebx, 18)
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}
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