universal_wallet 0.6.1

Rust implementation of the Universal Wallet 2020 Specification
Documentation 
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use super::unlocked::UnlockedWallet;
use super::Error;
use chacha20poly1305::{
    aead::{Aead, NewAead},
    XChaCha20Poly1305, XNonce,
};
use serde::{Deserialize, Serialize};
use serde_json::from_str;
use sha3::{Digest, Sha3_256};

/// Represents wallet in locked (encrypted) state
#[derive(Serialize, Deserialize)]
pub struct LockedWallet {
    /// Wallet ID
    pub id: String,
    /// Encrypted wallet Content
    pub ciphertext: Vec<u8>,
}

impl LockedWallet {
    /// Instantiates encrypted wallet from ID and ciphertext
    ///
    /// # Parameters
    ///
    /// * id - `&str` of wallet's ID
    /// * ct - encrypted content of the wallet
    ///
    pub fn new(id: &str, ct: Vec<u8>) -> Self {
        Self {
            id: id.to_string(),
            ciphertext: ct,
        }
    }

    /// Unlocks the wallet into `UnlockedWallet`
    ///
    /// # Parameters
    ///
    /// * key - password to decrypt content with
    ///
    pub fn unlock(&self, key: &[u8]) -> Result<UnlockedWallet, Error> {
        let mut sha3 = Sha3_256::new();
        sha3.update(key);
        let pass = sha3.finalize();

        let cha_cha = XChaCha20Poly1305::new(&pass);

        let nonce_start = self.ciphertext.len() - 24;
        let nonce = XNonce::from_slice(&self.ciphertext[nonce_start..]);
        let content = &self.ciphertext[..nonce_start];
        let dec = cha_cha
            .decrypt(nonce, content)
            .map_err(Error::AeadCryptoError)?;

        let as_str = std::str::from_utf8(&dec).map_err(Error::Utf8)?;

        from_str(as_str).map_err(Error::Serde)
    }
}