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092c51afed
The M1 chip in the new range of Macs includes the crypto extension that permits AES, SHA-1 and SHA-256 acceleration. But you can't find that out by querying the ELF aux vector, because macOS isn't even ELF-based at all, so there isn't an ELF aux vector, and no web search I've tried has turned up any MachO thing obviously analogous to it. Running 'sysctl -a' does show some flags indicating CPU architecture extensions, but they're more advanced ones than this. So I think we have to assume that if we're on the new M1 macOS at all, then we have the basic crypto extension available. Accordingly, I've added a special case to all the query functions that simply returns true if defined __APPLE__.
53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
#include "putty.h"
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#include "ssh.h"
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#include "uxutils.h"
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#if defined __arm__ || defined __aarch64__
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bool platform_aes_hw_available(void)
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{
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#if defined HWCAP_AES
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return getauxval(AT_HWCAP) & HWCAP_AES;
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#elif defined HWCAP2_AES
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return getauxval(AT_HWCAP2) & HWCAP2_AES;
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#elif defined __APPLE__
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/* M1 macOS defines no optional sysctl flag indicating presence of
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* the AES extension, which I assume to be because it's always
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* present */
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return true;
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#else
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return false;
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#endif
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}
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bool platform_sha256_hw_available(void)
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{
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#if defined HWCAP_SHA2
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return getauxval(AT_HWCAP) & HWCAP_SHA2;
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#elif defined HWCAP2_SHA2
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return getauxval(AT_HWCAP2) & HWCAP2_SHA2;
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#elif defined __APPLE__
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/* Assume always present on M1 macOS, similarly to AES */
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return true;
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#else
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return false;
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#endif
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}
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bool platform_sha1_hw_available(void)
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{
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#if defined HWCAP_SHA1
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return getauxval(AT_HWCAP) & HWCAP_SHA1;
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#elif defined HWCAP2_SHA1
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return getauxval(AT_HWCAP2) & HWCAP2_SHA1;
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#elif defined __APPLE__
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/* Assume always present on M1 macOS, similarly to AES */
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return true;
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#else
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return false;
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#endif
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}
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#endif /* defined __arm__ || defined __aarch64__ */
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