saymrwulf/betrusted-curve25519-dalek-source
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work around compiler bug https://github.com/rust-lang/rust/issues/86693

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thanks @xobs for the work-around!
This commit is contained in:
bunnie 2021-06-29 22:42:47 +08:00
parent 1a79b76e90
commit 279bbc5287
1 changed files with 18 additions and 4 deletions
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22
src/scalar.rs
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@ -915,8 +915,14 @@ impl Scalar {
let mut naf = [0i8; 256];
let mut x_u64 = [0u64; 5];
LittleEndian::read_u64_into(&self.bytes, &mut x_u64[0..4]);
#[repr(align(32))]
struct AlignedU64Slice<const N: usize>([u64; N]);
let mut x_u64 = AlignedU64Slice([0u64; 5]);
LittleEndian::read_u64_into(&self.bytes, &mut x_u64.0[0..4]);
#[cfg(feature = "betrusted")]
log::trace!("x_u64: {:?}", x_u64.0);
let width = 1 << w;
let window_mask = width - 1;
@ -930,10 +936,10 @@ impl Scalar {
let bit_buf: u64;
if bit_idx < 64 - w {
// This window's bits are contained in a single u64
bit_buf = x_u64[u64_idx] >> bit_idx;
bit_buf = x_u64.0[u64_idx] >> bit_idx;
} else {
// Combine the current u64's bits with the bits from the next u64
bit_buf = (x_u64[u64_idx] >> bit_idx) | (x_u64[1+u64_idx] << (64 - bit_idx));
bit_buf = (x_u64.0[u64_idx] >> bit_idx) | (x_u64.0[1+u64_idx] << (64 - bit_idx));
}
// Add the carry into the current window
@ -949,9 +955,17 @@ impl Scalar {
}
if window < width/2 {
#[cfg(feature = "betrusted")]
log::trace!("carry 0 width {} naf[{}] = {}; c.{} bb.{:x} wm.{} idx64.{} idxbit.{} xu64[0].{:x}", width, pos, window,
carry, bit_buf, window_mask, u64_idx, bit_idx, x_u64.0[0],
);
carry = 0;
naf[pos] = window as i8;
} else {
#[cfg(feature = "betrusted")]
log::trace!("carry 1 width {} naf[{}] = {}/{}; c.{} bb.{:x} wm.{} idx64.{} idxbit.{} xu64[0].{:x}", width, pos, window, (window as i8).wrapping_sub(width as i8),
carry, bit_buf, window_mask, u64_idx, bit_idx, x_u64.0[0]
);
carry = 1;
naf[pos] = (window as i8).wrapping_sub(width as i8);
}