elliptic-curve: add ops::MulVartime trait and bound Scalar#2379
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elliptic-curve: add ops::MulVartime trait and bound Scalar#2379
ops::MulVartime trait and bound Scalar#2379Conversation
Adds a variable-time equivalent of the `Mul` trait with a corresponding `mul_vartime` method. This provides a place to plug in wNAF which is otherwise always available (and can fall back on constant-time operations if the `alloc` feature isn't enabled).
tarcieri
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Apr 10, 2026
Companion PR to RustCrypto/traits#2379 This adds initial impls of the `MulVartime` trait which are required by the bounds added in the PR above. These don't yet use variable-time implementations as noted in the TODOs, however the idea is we can opportunistically plug in wNAF when the `alloc` feature is enabled. However, actually implementing that has been saved for a follow-up. This also adds an impl of the new `PointWithBasepointTable` to `k256`, which makes the table accessible in a generic context.
tarcieri
added a commit
to RustCrypto/elliptic-curves
that referenced
this pull request
Apr 10, 2026
Companion PR to RustCrypto/traits#2379 This adds initial impls of the `MulVartime` trait which are required by the bounds added in the PR above. These don't yet use variable-time implementations as noted in the TODOs, however the idea is we can opportunistically plug in wNAF when the `alloc` feature is enabled. However, actually implementing that has been saved for a follow-up. This also adds an impl of the new `PointWithBasepointTable` to `k256`, which makes the table accessible in a generic context.
tarcieri
added a commit
to RustCrypto/elliptic-curves
that referenced
this pull request
Apr 10, 2026
Companion PR to RustCrypto/traits#2379 This adds initial impls of the `MulVartime` trait which are required by the bounds added in the PR above. These don't yet use variable-time implementations as noted in the TODOs, however the idea is we can opportunistically plug in wNAF when the `alloc` feature is enabled. However, actually implementing that has been saved for a follow-up. This also adds an impl of the new `PointWithBasepointTable` to `k256`, which makes the table accessible in a generic context.
tarcieri
added a commit
to RustCrypto/elliptic-curves
that referenced
this pull request
Apr 10, 2026
Companion PR to RustCrypto/traits#2379 This adds initial impls of the `MulVartime` trait which are required by the bounds added in the PR above. These don't yet use variable-time implementations as noted in the TODOs, however the idea is we can opportunistically plug in wNAF when the `alloc` feature is enabled. However, actually implementing that has been saved for a follow-up. This also adds an impl of the new `PointWithBasepointTable` to `k256`, which makes the table accessible in a generic context.
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Adds a variable-time equivalent of the
Multrait with a correspondingmul_vartimemethod. This provides a place to plug in wNAF which is otherwise always available (and can fall back on constant-time operations if theallocfeature isn't enabled).The trait has been added to the bounds for
CurveArithmetic::Scalar, with requirements to support variable-time multiplication for affine and projective points.