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Rename is_negative to is_negative_ed25519

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This commit is contained in:
Henry de Valence 2017-01-31 20:03:29 -05:00
parent 5720e249ab
commit 3fc5f75300
2 changed files with 5 additions and 4 deletions
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4
src/curve.rs
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@ -159,7 +159,7 @@ impl CompressedEdwardsY {
X *= &constants::SQRT_M1;
}
if X.is_negative() != (self[31] >> 7) as i32 {
if X.is_negative_ed25519() != (self[31] >> 7) as i32 {
X = X.neg();
}
T = &X * &Y;
@ -391,7 +391,7 @@ impl ProjectivePoint {
let mut s: [u8; 32];
s = y.to_bytes();
s[31] ^= (x.is_negative() << 7) as u8;
s[31] ^= (x.is_negative_ed25519() << 7) as u8;
CompressedEdwardsY(s)
}
}

5
src/field.rs
View file

@ -510,13 +510,14 @@ impl FieldElement {
(!equal_so_far & 1 & greater) as u8
}
/// Determine if this `FieldElement` is negative.
/// Determine if this `FieldElement` is negative, in the
/// sense used in the ed25519 paper.
///
/// # Return
///
/// If negative, return `1i32`. Otherwise, return `0i32`.
// XXX should return u8
pub fn is_negative(&self) -> i32 { //FeIsNegative
pub fn is_negative_ed25519(&self) -> i32 { //FeIsNegative
let bytes = self.to_bytes();
(bytes[0] & 1) as i32
}