libes 0.9.1

Collection of Elliptic Curve Integrated Encryption Scheme(s)
Documentation 
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use super::generics::Encryption;
use crate::EciesError;
use chacha20poly1305::aead::{Aead, Payload};
use chacha20poly1305::KeyInit;

#[cfg(feature = "ECIES-MAC")]
use crate::markers::{EciesMacDecryptionSupport, EciesMacEncryptionSupport};
#[cfg(feature = "ECIES-MAC")]
impl EciesMacEncryptionSupport for ChaCha20Poly1305 {}
#[cfg(feature = "ECIES-MAC")]
impl EciesMacDecryptionSupport for ChaCha20Poly1305 {}

#[cfg(feature = "ECIES-AEAD")]
use crate::markers::{EciesAeadDecryptionSupport, EciesAeadEncryptionSupport};
#[cfg(feature = "ECIES-AEAD")]
impl EciesAeadEncryptionSupport for ChaCha20Poly1305 {}
#[cfg(feature = "ECIES-AEAD")]
impl EciesAeadDecryptionSupport for ChaCha20Poly1305 {}

#[cfg(feature = "ECIES-SYN")]
use crate::markers::{EciesSynDecryptionSupport, EciesSynEncryptionSupport};
#[cfg(feature = "ECIES-SYN")]
impl EciesSynEncryptionSupport for ChaCha20Poly1305 {}
#[cfg(feature = "ECIES-SYN")]
impl EciesSynDecryptionSupport for ChaCha20Poly1305 {}

/// Marker for using the `ChaCha20-Poly1305` algorithm for encryption
///
/// ChaCha20-Poly1305 is provided by [chacha20poly1305](https://crates.io/crates/chacha20poly1305)
pub struct ChaCha20Poly1305;

impl Encryption for ChaCha20Poly1305 {
    const ENCRYPTION_KEY_LEN: usize = 32;
    const ENCRYPTION_NONCE_LEN: usize = 12;

    fn encrypt(key: &[u8], nonce: &[u8], plaintext: &[u8]) -> Result<Vec<u8>, EciesError> {
        let enc = chacha20poly1305::ChaCha20Poly1305::new_from_slice(key)
            .map_err(|_| EciesError::BadData)?;

        enc.encrypt(
            nonce.into(),
            Payload {
                msg: plaintext,
                aad: b"",
            },
        )
        .map_err(|_| EciesError::EncryptionError)
    }

    fn decrypt(key: &[u8], nonce: &[u8], ciphertext: &[u8]) -> Result<Vec<u8>, EciesError> {
        let dec = chacha20poly1305::ChaCha20Poly1305::new_from_slice(key)
            .map_err(|_| EciesError::BadData)?;

        dec.decrypt(
            nonce.into(),
            Payload {
                msg: ciphertext,
                aad: b"",
            },
        )
        .map_err(|_| EciesError::DecryptionError)
    }
}