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elliptic-curve: ScalarBytes::from_uint #651

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Jun 5, 2021
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elliptic-curve: ScalarBytes::from_uint #651

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10 changes: 8 additions & 2 deletions elliptic-curve/src/scalar/bytes.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -31,8 +31,14 @@ where
/// Create new [`ScalarBytes`], checking that the given input is within
/// range of the [`Curve::ORDER`].
pub fn new(bytes: FieldBytes<C>) -> CtOption<Self> {
let is_some = C::UInt::from_be_byte_array(&bytes).ct_lt(&C::ORDER);
CtOption::new(Self { inner: bytes }, is_some)
Self::from_uint(&C::UInt::from_be_byte_array(&bytes))
}

/// Create [`ScalarBytes`] from the provided `C::UInt`.
pub fn from_uint(uint: &C::UInt) -> CtOption<Self> {
let inner = uint.to_be_byte_array();
let in_range = uint.ct_lt(&C::ORDER);
CtOption::new(Self { inner }, in_range)
}

/// Convert from a [`Scalar`] type for this curve.
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