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use openssl::{
md::Md,
pkey::Id,
pkey_ctx::PkeyCtx,
};
use crate::{
Result,
crypto::{
SessionKey,
backend::interface::Kdf,
},
};
impl Kdf for super::Backend {
fn hkdf_sha256(ikm: &SessionKey, salt: Option<&[u8]>, info: &[u8],
okm: &mut SessionKey)
-> Result<()>
{
let mut pkey = PkeyCtx::new_id(Id::HKDF)?;
pkey.derive_init()?;
pkey.set_hkdf_md(Md::sha256())?;
pkey.set_hkdf_key(&ikm)?;
if let Some(salt) = salt {
pkey.set_hkdf_salt(salt)?;
}
pkey.add_hkdf_info(info)?;
pkey.derive(Some(okm))?;
Ok(())
}
}
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