1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29

//! Signing API for Signatory providers

#[cfg(feature = "digest")]
pub(crate) mod digest;
pub(crate) mod sha2;
use crate::error::Error;
use crate::Signature;

/// Trait for all signers which accept a message (byte slice) and produce a
/// signature of that message using this signer's private key.
///
/// Signers should implement this trait for algorithms where there aren't
/// multiple options for the digest function to be used to hash the message,
/// e.g. Ed25519.
pub trait Signer<S: Signature>: Send + Sync {
    /// Sign the given byte slice with this signer's private key, returning a
    /// signature.
    fn sign(&self, msg: &[u8]) -> Result<S, Error>;
}

/// Sign the given message (byte slice) with the given `Signer`, returning a
/// signature on success.
#[inline]
pub fn sign<S>(signer: &dyn Signer<S>, msg: &[u8]) -> Result<S, Error>
where
    S: Signature,
{
    signer.sign(msg)
}