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Add: restore method #21

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Add: restore method #21

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29 changes: 29 additions & 0 deletions src/api.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,11 @@ pub enum SignError {
Verify,
}

pub enum RestoreError {
PublicKeyLen,
SecretKeyLen,
}

impl Keypair {
/// Explicitly expose secret key
/// ```
Expand Down Expand Up @@ -46,6 +51,30 @@ impl Keypair {
crypto_sign_keypair(&mut public, &mut secret, None);
Keypair { public, secret }
}

/// Restores a keypair from public and secret key
///
/// Example:
/// ```
/// # use pqc_dilithium::*;
/// let (public, secret) = get_keys_from_db(&mut conn).await?;
/// let keys = Keypair::restore(public, secret)?;
/// ```
pub fn restore(public: &[u8], secret: &[u8]) -> Result<Keypair, RestoreError> {
if public.len() != PUBLICKEYBYTES {
return Err(RestoreError::PublicKeyLen)
}
if secret.len() != SECRETKEYBYTES {
return Err(RestoreError::SecretKeyLen)
}

let mut _public = [0u8; PUBLICKEYBYTES];
let mut _secret = [0u8; SECRETKEYBYTES];
_public[..PUBLICKEYBYTES].copy_from_slice(public);
_secret[..SECRETKEYBYTES].copy_from_slice(secret);

Ok(Keypair { public: _public, secret: _secret })
}

/// Generates a signature for the given message using a keypair
///
Expand Down