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Clarify black_box warning a bit #140341

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May 9, 2025
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Clarify black_box warning a bit #140341

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4 changes: 4 additions & 0 deletions library/core/src/hint.rs
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Expand Up @@ -320,6 +320,10 @@ pub fn spin_loop() {
/// This also means that this function does not offer any guarantees for cryptographic or security
/// purposes.
///
/// This limitation is not specific to `black_box`; there is no mechanism in the entire Rust
/// language that can provide the guarantees required for constant-time cryptography.
/// (There is also no such mechanism in LLVM, so the same is true for every other LLVM-based compiler.)
///
/// </div>
///
/// [`std::convert::identity`]: crate::convert::identity
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