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Improve docs for mbedtls_ct_compiler_opaque

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
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Dave Rodgman
2023-07-31 12:30:26 +01:00
parent 32d726033b
commit 93cec45af3
2 changed files with 16 additions and 2 deletions
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13
library/constant_time_impl.h
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@ -68,6 +68,19 @@
extern volatile mbedtls_ct_uint_t mbedtls_ct_zero;
#endif
/**
* \brief Ensure that a value cannot be known at compile time.
*
* \param x The value to hide from the compiler.
* \return The same value that was passed in, such that the compiler
* cannot prove its value (even for calls of the form
* x = mbedtls_ct_compiler_opaque(1), x will be unknown).
*
* \note This is mainly used in constructing mbedtls_ct_condition_t
* values and performing operations over them, to ensure that
* there is no way for the compiler to ever know anything about
* the value of an mbedtls_ct_condition_t.
*/
static inline mbedtls_ct_uint_t mbedtls_ct_compiler_opaque(mbedtls_ct_uint_t x)
{
#if defined(MBEDTLS_CT_ASM)