Struct curve25519_dalek::edwards::CompressedEdwardsY

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pub struct CompressedEdwardsY(pub [u8; 32]);
Expand description

In “Edwards y” / “Ed25519” format, the curve point \((x,y)\) is determined by the \(y\)-coordinate and the sign of \(x\).

The first 255 bits of a CompressedEdwardsY represent the \(y\)-coordinate. The high bit of the 32nd byte gives the sign of \(x\).

Tuple Fields§

§0: [u8; 32]

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impl CompressedEdwardsY

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pub const fn as_bytes(&self) -> &[u8; 32]

View this CompressedEdwardsY as an array of bytes.

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pub const fn to_bytes(&self) -> [u8; 32]

Copy this CompressedEdwardsY to an array of bytes.

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pub fn decompress(&self) -> Option<EdwardsPoint>

Attempt to decompress to an EdwardsPoint.

Returns None if the input is not the \(y\)-coordinate of a curve point.

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impl CompressedEdwardsY

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pub fn from_slice(bytes: &[u8]) -> Result<CompressedEdwardsY, TryFromSliceError>

Construct a CompressedEdwardsY from a slice of bytes.

§Errors

Returns TryFromSliceError if the input bytes slice does not have a length of 32.

Trait Implementations§

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impl Clone for CompressedEdwardsY

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fn clone(&self) -> CompressedEdwardsY

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl ConstantTimeEq for CompressedEdwardsY

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fn ct_eq(&self, other: &CompressedEdwardsY) -> Choice

Determine if two items are equal. Read more
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fn ct_ne(&self, other: &Self) -> Choice

Determine if two items are NOT equal. Read more
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impl Debug for CompressedEdwardsY

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for CompressedEdwardsY

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fn default() -> CompressedEdwardsY

Returns the “default value” for a type. Read more
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impl Hash for CompressedEdwardsY

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Identity for CompressedEdwardsY

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fn identity() -> CompressedEdwardsY

Returns the identity element of the curve. Can be used as a constructor.
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impl PartialEq for CompressedEdwardsY

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fn eq(&self, other: &CompressedEdwardsY) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl TryFrom<&[u8]> for CompressedEdwardsY

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type Error = TryFromSliceError

The type returned in the event of a conversion error.
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fn try_from(slice: &[u8]) -> Result<CompressedEdwardsY, TryFromSliceError>

Performs the conversion.
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impl Zeroize for CompressedEdwardsY

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fn zeroize(&mut self)

Reset this CompressedEdwardsY to the compressed form of the identity element.

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impl Copy for CompressedEdwardsY

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impl Eq for CompressedEdwardsY

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impl StructuralPartialEq for CompressedEdwardsY

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Copy,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IsIdentity for T

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fn is_identity(&self) -> bool

Return true if this element is the identity element of the curve.
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.