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core/crypto: Disable optimization for the ct byte compare

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Hedge against the possibility of a compiler getting clever enough to
optimize this pattern as well.
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Yawning Angel
2023-04-08 10:11:04 +09:00
parent d72db2698b
commit b8c2b0105b
1 changed files with 1 additions and 0 deletions
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core/crypto/crypto.odin
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@@ -26,6 +26,7 @@ compare_constant_time :: proc "contextless" (a, b: []byte) -> int {
// //
// The execution time of this routine is constant regardless of the // The execution time of this routine is constant regardless of the
// contents of the memory being compared. // contents of the memory being compared.
@(optimization_mode="none")
compare_byte_ptrs_constant_time :: proc "contextless" (a, b: ^byte, n: int) -> int { compare_byte_ptrs_constant_time :: proc "contextless" (a, b: ^byte, n: int) -> int {
x := mem.slice_ptr(a, n) x := mem.slice_ptr(a, n)
y := mem.slice_ptr(b, n) y := mem.slice_ptr(b, n)