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https://github.com/rspamd/rspamd.git
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ff62d93b0e
Libottery itself is hosted here: https://github.com/nmathewson/libottery This import is a rough adoptation of libottery to use it for secure random numbers in rspamd when needed (and in DNS resolver specifically). This import makes the internal chacha20 code useless, hence it is removed now.
89 lines
1.9 KiB
C
89 lines
1.9 KiB
C
/* Libottery by Nick Mathewson.
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This software has been dedicated to the public domain under the CC0
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public domain dedication.
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To the extent possible under law, the person who associated CC0 with
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libottery has waived all copyright and related or neighboring rights
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to libottery.
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You should have received a copy of the CC0 legalcode along with this
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work in doc/cc0.txt. If not, see
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<http://creativecommons.org/publicdomain/zero/1.0/>.
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*/
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#include "ottery-internal.h"
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#include <stdint.h>
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#if defined(i386) || \
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defined(__i386) || \
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defined(__M_IX86) || \
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defined(_M_IX86)
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#define X86
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#elif defined(__x86_64) || \
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defined(_M_AMD64)
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#define X86
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#define X86_64
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#endif
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#if defined(__arm__) || \
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defined(_M_ARM)
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#define ARM
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#endif
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#if defined(X86)
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#ifdef _MSC_VER
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#include <intrin.h>
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#define cpuid(a,b) __cpuid((b), (a))
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#else
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static void
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cpuid(int index, int regs[4])
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{
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unsigned int eax, ebx, ecx, edx;
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#ifdef X86_64
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__asm("cpuid" : "=a"(eax), "=b" (ebx), "=c"(ecx), "=d"(edx)
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: "0"(index));
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#else
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__asm volatile(
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"xchgl %%ebx, %1; cpuid; xchgl %%ebx, %1"
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: "=a" (eax), "=r" (ebx), "=c" (ecx), "=d" (edx)
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: "0" (index)
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: "cc" );
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#endif
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regs[0] = eax;
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regs[1] = ebx;
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regs[2] = ecx;
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regs[3] = edx;
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}
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#endif
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#endif
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static uint32_t disabled_cpu_capabilities = 0;
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void
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ottery_disable_cpu_capabilities_(uint32_t disable)
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{
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disabled_cpu_capabilities |= disable;
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}
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uint32_t
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ottery_get_cpu_capabilities_(void)
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{
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#ifdef X86
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uint32_t cap = 0;
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int res[4];
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cpuid(1, res);
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if (res[3] & (1<<26))
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cap |= OTTERY_CPUCAP_SIMD;
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if (res[2] & (1<<9))
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cap |= OTTERY_CPUCAP_SSSE3;
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if (res[2] & (1<<25))
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cap |= OTTERY_CPUCAP_AES;
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if (res[2] & (1<<30))
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cap |= OTTERY_CPUCAP_RAND;
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#else
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uint32_t cap = OTTERY_CPUCAP_SIMD;
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#endif
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return cap & ~disabled_cpu_capabilities;
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}
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