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Implement conversions between basepoint table sizes.

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This is useful for programs/protocol which can do some heuristics or
learning-based approach towards optimising the table size based on the number of
uses of e.g. a public key, the second basepoint in a Pedersen commitment, etc.,
i.e. the first time a public key is used to verify a signature, the usual
variable-time basepoint multiscalar multiplication is used, however after 1000
verifications, the table size is upgraded, and again after 10000 verifications,
etc.
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Isis Lovecruft 2019-12-30 22:05:01 +00:00
parent 8a9e09ba34
commit cfbcb6ca61
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1 changed files with 23 additions and 0 deletions
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src/edwards.rs
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@ -911,6 +911,29 @@ impl_basepoint_table! {Name = EdwardsBasepointTableRadix256, LookupTable = Looku
// it.
pub type EdwardsBasepointTableRadix16 = EdwardsBasepointTable;
macro_rules! impl_basepoint_table_conversions {
(LHS = $lhs:ty, RHS = $rhs:ty) => {
impl<'a> From<&'a $lhs> for $rhs {
fn from(table: &'a $lhs) -> $rhs {
<$rhs>::create(&table.basepoint())
}
}
impl<'a> From<&'a $rhs> for $lhs {
fn from(table: &'a $rhs) -> $lhs {
<$lhs>::create(&table.basepoint())
}
}
}
}
impl_basepoint_table_conversions!{LHS = EdwardsBasepointTableRadix16, RHS = EdwardsBasepointTableRadix64}
impl_basepoint_table_conversions!{LHS = EdwardsBasepointTableRadix16, RHS = EdwardsBasepointTableRadix128}
impl_basepoint_table_conversions!{LHS = EdwardsBasepointTableRadix16, RHS = EdwardsBasepointTableRadix256}
impl_basepoint_table_conversions!{LHS = EdwardsBasepointTableRadix64, RHS = EdwardsBasepointTableRadix128}
impl_basepoint_table_conversions!{LHS = EdwardsBasepointTableRadix64, RHS = EdwardsBasepointTableRadix256}
impl_basepoint_table_conversions!{LHS = EdwardsBasepointTableRadix128, RHS = EdwardsBasepointTableRadix256}
impl EdwardsPoint {
/// Multiply by the cofactor: return \\([8]P\\).
pub fn mul_by_cofactor(&self) -> EdwardsPoint {