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Add support for ARMv8 #384

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Add support for ARMv8 #384

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29 changes: 29 additions & 0 deletions src/util_helpers.c
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Original file line number Diff line number Diff line change
Expand Up @@ -101,6 +101,35 @@ uint32_t rust_crypto_util_fixed_time_eq_asm(uint8_t* lhsp, uint8_t* rhsp, size_t
}
#endif

#ifdef __aarch64__
uint32_t rust_crypto_util_fixed_time_eq_asm(uint8_t* lhsp, uint8_t* rhsp, size_t count) {
if (count == 0) {
return 1;
}
uint8_t result = 0;
asm(
" \
1: \
\
ldrb w4, [%1]; \
ldrb w5, [%2]; \
eor w4, w4, w5; \
orr %0, %0, w4; \
\
add %1, %1, #1; \
add %2, %2, #1; \
subs %3, %3, #1; \
bne 1b; \
"
: "+&r" (result), "+&r" (lhsp), "+&r" (rhsp), "+&r" (count) // all input and output
: // input
: "w4", "w5", "cc" // clobbers
);

return result;
}
#endif

void rust_crypto_util_secure_memset(uint8_t* dst, uint8_t val, size_t count) {
memset(dst, val, count);
asm volatile("" : : "g" (dst) : "memory");
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