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signature 1.6.1

Traits for cryptographic signature algorithms (e.g. ECDSA, Ed25519)
Documentation 
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//! Signing keypairs.

use crate::{Signature, Signer, Verifier};

/// Signing keypair with an associated verifying key.
///
/// This represents a type which holds both a signing key and a verifying key.
pub trait Keypair<S: Signature>: AsRef<Self::VerifyingKey> + Signer<S> {
    /// Verifying key type for this keypair.
    type VerifyingKey: Verifier<S>;

    /// Get the verifying key which can verify signatures produced by the
    /// signing key portion of this keypair.
    fn verifying_key(&self) -> &Self::VerifyingKey {
        self.as_ref()
    }
}