spki 0.8.0-rc.4

X.509 Subject Public Key Info (RFC5280) describing public keys as well as their associated AlgorithmIdentifiers (i.e. OIDs)
Documentation 
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use der::{Result, Writer};
use digest::Digest;

/// Adapter object to write to a digest backend
pub struct DigestWriter<'d, D>(pub &'d mut D);

impl<D> Writer for DigestWriter<'_, D>
where
    D: Digest,
{
    fn write(&mut self, slice: &[u8]) -> Result<()> {
        self.0.update(slice);
        Ok(())
    }
}