saymrwulf/betrusted-curve25519-dalek-source
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move microcode to the Xous side of things

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minimizing the mount of data movement speeds up operations by
about 2x
This commit is contained in:
bunnie 2021-06-28 18:31:45 +08:00
parent 41cc7c4ab3
commit 1a79b76e90
1 changed files with 297 additions and 278 deletions
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19
src/montgomery.rs
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@ -613,6 +613,12 @@ impl<'a, 'b> Mul<&'b Scalar> for &'a MontgomeryPoint {
W: FieldElement::one(), W: FieldElement::one(),
}; };
// for now, prefer to use the fully-accelerated version where this code is local to the server
// instead of transmitting it every call with the data...gives about a 2x performance speedup
if false {
#[cfg(not(test))] // due to issue https://github.com/rust-lang/rust/issues/59168, you will have to manually comment this out when running a test on the full system and not just this crate.
log::warn!("wrong multiply being used!");
let mcode = assemble_engine25519!( let mcode = assemble_engine25519!(
start: start:
// P.U in %20 // P.U in %20
@ -918,6 +924,19 @@ impl<'a, 'b> Mul<&'b Scalar> for &'a MontgomeryPoint {
} else { } else {
MontgomeryPoint(copy_from_rf(31, &result_rf)) MontgomeryPoint(copy_from_rf(31, &result_rf))
} }
} else {
let mut engine = engine_25519::Engine25519::new();
let job = engine_25519::MontgomeryJob {
x0_u: x0.U.to_bytes(),
x0_w: x0.W.to_bytes(),
x1_u: x1.U.to_bytes(),
x1_w: x1.W.to_bytes(),
affine_u: affine_u.to_bytes(),
scalar: scalar.bytes,
};
MontgomeryPoint(engine.montgomery_job(job).expect("couldn't run montgomery multiply job"))
}
} }
#[cfg(not(feature = "betrusted"))] #[cfg(not(feature = "betrusted"))]
fn mul(self, scalar: &'b Scalar) -> MontgomeryPoint { fn mul(self, scalar: &'b Scalar) -> MontgomeryPoint {