curve25519_dalek::edwards

Struct 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]

Implementations§

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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

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

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

Available on crate feature zeroize only.
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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

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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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Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 32 bytes