saymrwulf/betrusted-curve25519-dalek-source
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fix: incorrectly prevented to_radix_2w_size_hint on u32e

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This function should be able to be enabled by feature
selection.
This commit is contained in:
David Kotval 2024-03-21 16:35:12 -05:00
parent 4fdd15c3af
commit 0a0a972dfa
1 changed files with 14 additions and 18 deletions
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32
curve25519-dalek/src/scalar.rs
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@ -1026,27 +1026,23 @@ impl Scalar {
output output
} }
cfg_if::cfg_if!{ #[cfg(any(feature = "alloc", all(test, feature = "precomputed-tables")))]
if #[cfg(curve25519_dalek_backend = "u32e_backend")]{} /// Returns a size hint indicating how many entries of the return
else if #[cfg(any(feature = "alloc", all(test, feature = "precomputed-tables")))] { /// value of `to_radix_2w` are nonzero.
/// Returns a size hint indicating how many entries of the return pub(crate) fn to_radix_2w_size_hint(w: usize) -> usize {
/// value of `to_radix_2w` are nonzero. debug_assert!(w >= 4);
pub(crate) fn to_radix_2w_size_hint(w: usize) -> usize { debug_assert!(w <= 8);
debug_assert!(w >= 4);
debug_assert!(w <= 8);
let digits_count = match w { let digits_count = match w {
4..=7 => (256 + w - 1) / w, 4..=7 => (256 + w - 1) / w,
// See comment in to_radix_2w on handling the terminal carry. // See comment in to_radix_2w on handling the terminal carry.
8 => (256 + w - 1) / w + 1_usize, 8 => (256 + w - 1) / w + 1_usize,
_ => panic!("invalid radix parameter"), _ => panic!("invalid radix parameter"),
}; };
debug_assert!(digits_count <= 64); debug_assert!(digits_count <= 64);
digits_count digits_count
}
} }
}
/// Creates a representation of a Scalar in radix \\( 2^w \\) with \\(w = 4, 5, 6, 7, 8\\) for /// Creates a representation of a Scalar in radix \\( 2^w \\) with \\(w = 4, 5, 6, 7, 8\\) for
/// use with the Pippenger algorithm. Higher radixes are not supported to save cache space. /// use with the Pippenger algorithm. Higher radixes are not supported to save cache space.