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CT: Strengthen post-condition of ct_memcmp #1463

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CT: Strengthen post-condition of ct_memcmp #1463

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3 changes: 2 additions & 1 deletion mlkem/src/verify.h
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Original file line number Diff line number Diff line change
Expand Up @@ -333,7 +333,7 @@ __contract__(ensures(return_value == (cond ? a : b)))
* to UINT16_MAX to control proof complexity
* only.
*
* Returns 0 if the byte arrays are equal, a non-zero value otherwise
* Returns 0 if the byte arrays are equal, 0xFF otherwise.
*
* Specification:
* - Used to securely compute conditional move in
Expand All @@ -354,6 +354,7 @@ __contract__(
requires(len <= UINT16_MAX)
requires(memory_no_alias(a, len))
requires(memory_no_alias(b, len))
ensures((return_value == 0) || (return_value == 0xFF))
ensures((return_value == 0) == forall(i, 0, len, (a[i] == b[i]))))
{
uint8_t r = 0, s = 0;
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