Struct secp256k1::ellswift::ElligatorSwift

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pub struct ElligatorSwift(/* private fields */);
Expand description

ElligatorSwift is an encoding of a uniformly chosen point on the curve as a 64-byte array that is indistinguishable from a uniformly random array. This object holds two field elements u and t, which are the inputs to the ElligatorSwift encoding function.

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impl ElligatorSwift

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pub fn new(secret_key: SecretKey, rand: [u8; 32]) -> ElligatorSwift

Create a new ElligatorSwift object from a 64-byte array.

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pub fn from_array(ellswift: [u8; 64]) -> ElligatorSwift

Creates an ElligatorSwift object from a 64-byte array.

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pub fn to_array(&self) -> [u8; 64]

Returns the 64-byte array representation of this ElligatorSwift object.

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pub fn from_seckey<C: Verification>( secp: &Secp256k1<C>, sk: SecretKey, aux_rand: Option<[u8; 32]>, ) -> ElligatorSwift

Creates the Elligator Swift encoding from a secret key, using some aux_rand if defined. This method is preferred instead of just decoding, because the private key offers extra entropy.

§Example
    use secp256k1::{ellswift::ElligatorSwift, PublicKey, Secp256k1, SecretKey};
    let secp = Secp256k1::new();
    let sk = SecretKey::from_slice(&[1; 32]).unwrap();
    let es = ElligatorSwift::from_seckey(&secp, sk, None);
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pub fn from_pubkey(pk: PublicKey) -> ElligatorSwift

Computes the ElligatorSwift encoding for a valid public key

§Example
    use secp256k1::{ellswift::ElligatorSwift, PublicKey, Secp256k1, SecretKey};
    let secp = Secp256k1::new();
    let sk = SecretKey::from_slice(&[1; 32]).unwrap();
    let pk = PublicKey::from_secret_key(&secp, &sk);
    let es = ElligatorSwift::from_pubkey(pk);
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pub fn shared_secret( ellswift_a: ElligatorSwift, ellswift_b: ElligatorSwift, secret_key: SecretKey, party: ElligatorSwiftParty, data: Option<&[u8]>, ) -> ElligatorSwiftSharedSecret

Computes a shared secret only known by Alice and Bob. This is obtained by computing the x-only Elliptic Curve Diffie-Hellman (ECDH) shared secret between Alice and Bob.

§Example
    use secp256k1::{
        ellswift::{ElligatorSwift, ElligatorSwiftParty},
        PublicKey, SecretKey, XOnlyPublicKey, Secp256k1,
    };
    use core::str::FromStr;

    let secp = Secp256k1::new();

    let alice_sk = SecretKey::from_str("e714e76bdd67ad9f495683c37934148f4efc25ce3f01652c8a906498339e1f3a").unwrap();
    let bob_sk = SecretKey::from_str("b6c4b0e2f8c4359caf356a618cd1649d18790a1d67f7c2d1e4760e04c785db4f").unwrap();

    let alice_es = ElligatorSwift::from_seckey(&secp, alice_sk, None);
    let bob_es = ElligatorSwift::from_seckey(&secp, bob_sk, None);

    let alice_shared_secret = ElligatorSwift::shared_secret(alice_es, bob_es, alice_sk, ElligatorSwiftParty::A, None);
    let bob_shared_secret = ElligatorSwift::shared_secret(alice_es, bob_es, bob_sk, ElligatorSwiftParty::B, None);

    assert_eq!(alice_shared_secret, bob_shared_secret);
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pub fn shared_secret_with_hasher<F>( ellswift_a: ElligatorSwift, ellswift_b: ElligatorSwift, secret_key: SecretKey, party: ElligatorSwiftParty, hash_function: F, ) -> ElligatorSwiftSharedSecret
where F: FnMut([u8; 32], [u8; 64], [u8; 64]) -> ElligatorSwiftSharedSecret,

Computes a shared secret, just like shared_secret, but with a custom hash function for computing the shared secret. For compatibility with other libraries, you should use shared_secret instead, which is already compatible with BIP324. The hash function takes three arguments: the shared point, and the ElligatorSwift encodings of the two parties and returns a 32-byte shared secret.

Trait Implementations§

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impl CPtr for ElligatorSwift

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type Target = u8

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fn as_mut_c_ptr(&mut self) -> *mut Self::Target

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fn as_c_ptr(&self) -> *const Self::Target

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impl Clone for ElligatorSwift

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fn clone(&self) -> ElligatorSwift

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 Debug for ElligatorSwift

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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 Display for ElligatorSwift

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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 FromStr for ElligatorSwift

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fn from_str(hex: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type. Read more
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type Err = Error

The associated error which can be returned from parsing.
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impl Hash for ElligatorSwift

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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 LowerHex for ElligatorSwift

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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 Ord for ElligatorSwift

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fn cmp(&self, other: &ElligatorSwift) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl PartialEq for ElligatorSwift

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fn eq(&self, other: &ElligatorSwift) -> 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 PartialOrd for ElligatorSwift

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fn partial_cmp(&self, other: &ElligatorSwift) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl Copy for ElligatorSwift

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impl Eq for ElligatorSwift

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impl StructuralPartialEq for ElligatorSwift

Auto Trait 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> 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> ToString for T
where T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. 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.