Trait coins_bip32::ecdsa::signature::PrehashSignature

pub trait PrehashSignature: Signature {
    type Digest: Digest;
}

Marker trait for Signature types computable as 𝐒(𝐇(𝒎)) i.e. ones which prehash a message to be signed as 𝐇(𝒎)

Where:

• 𝐒: signature algorithm
• 𝐇: hash (a.k.a. digest) function
• 𝒎: message

This approach is relatively common in signature schemes based on the Fiat-Shamir heuristic.

For signature types that implement this trait, when the derive-preview Cargo feature is enabled a custom derive for Signer is available for any types that impl DigestSigner, and likewise for deriving Verifier for types which impl DigestVerifier.

Required Associated Types

type Digest: Digest

Preferred Digest algorithm to use when computing this signature type.

Implementations on Foreign Types

impl PrehashSignature for Signature

type Digest = CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, UInt<UInt<UInt<UInt<UInt<UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>>>

impl<C> PrehashSignature for Signature<C> where
    C: DigestPrimitive,
    <<<C as Curve>::UInt as ArrayEncoding>::ByteSize as Add<<<C as Curve>::UInt as ArrayEncoding>::ByteSize>>::Output: ArrayLength<u8>, 

type Digest = <C as DigestPrimitive>::Digest

impl<C> PrehashSignature for Signature<C> where
    C: PrimeCurve + DigestPrimitive,
    <<<<C as Curve>::UInt as ArrayEncoding>::ByteSize as Add<<<C as Curve>::UInt as ArrayEncoding>::ByteSize>>::Output as Add<UInt<UInt<UInt<UInt<UTerm, B1>, B0>, B0>, B1>>>::Output: ArrayLength<u8>,
    <<<C as Curve>::UInt as ArrayEncoding>::ByteSize as Add<<<C as Curve>::UInt as ArrayEncoding>::ByteSize>>::Output: Add<UInt<UInt<UInt<UInt<UTerm, B1>, B0>, B0>, B1>>,
    <<<C as Curve>::UInt as ArrayEncoding>::ByteSize as Add<<<C as Curve>::UInt as ArrayEncoding>::ByteSize>>::Output: ArrayLength<u8>, 

type Digest = <C as DigestPrimitive>::Digest

Implementors