walleth 0.1.0

A (WIP) Rust library for easily create, manage, use and protect Ethereum accounts.
Documentation 
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use chacha20poly1305::{
	aead::{Aead, NewAead},
	XChaCha20Poly1305,
};
use rand_core::{OsRng, RngCore};

pub type CipherKey = [u8; 32];
pub type CipherNonce = [u8; 24];
pub type EncryptedBytes = Vec<u8>;

pub struct ChaCha20Poly1305Cipher;

impl ChaCha20Poly1305Cipher {
	pub fn encrypt(
		key: &[u8; 32],
		data: &[u8],
	) -> Result<(EncryptedBytes, CipherNonce), String> {
		let mut nonce = [0; 24];
		OsRng.fill_bytes(&mut nonce);

		Ok((chacha20poly1305_encrypt((key, &nonce), data)?, nonce))
	}

	pub fn decrypt(
		key: &CipherKey,
		nonce: &CipherNonce,
		data: &[u8],
	) -> Result<EncryptedBytes, String> {
		Ok(chacha20poly1305_decrypt((key, nonce), data)?)
	}
}

fn chacha20poly1305_encrypt(
	(key, nonce): (&[u8; 32], &[u8; 24]),
	data: &[u8],
) -> Result<Vec<u8>, String> {
	let cipher = match XChaCha20Poly1305::new_from_slice(key) {
		Ok(cipher) => cipher,
		Err(_) => return Err("Invalid cipher key".to_string()),
	};

	match cipher.encrypt(nonce.into(), data) {
		Ok(ciphertext) => Ok(ciphertext),
		Err(_) => Err("Encryption failed".to_string()),
	}
}

fn chacha20poly1305_decrypt(
	(key, nonce): (&[u8; 32], &[u8; 24]),
	data: &[u8],
) -> Result<Vec<u8>, String> {
	let cipher = match XChaCha20Poly1305::new_from_slice(key) {
		Ok(cipher) => cipher,
		Err(_) => return Err("Invalid cipher key".to_string()),
	};

	match cipher.decrypt(nonce.into(), data) {
		Ok(plaintext) => Ok(plaintext),
		Err(_) => Err("Decryption failed".to_string()),
	}
}