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// Copyright 2019 The Tari Project // // Redistribution and use in source and binary forms, with or without modification, are permitted provided that the // following conditions are met: // // 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following // disclaimer. // // 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the // following disclaimer in the documentation and/or other materials provided with the distribution. // // 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote // products derived from this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, // INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE // USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. use crate::{ByteArray, ByteArrayError}; use derive_error::Error; #[derive(Debug, Error, PartialEq)] pub enum CipherError { /// Provided key is the incorrect size to be used by the Cipher KeyLengthError, /// Provided Nonce is the incorrect size to be used by the Cipher NonceLengthError, /// No data was provided for encryption/decryption NoDataError, /// Byte Array conversion error ByteArrayError(ByteArrayError), } /// A trait describing an interface to a symmetrical encryption scheme pub trait Cipher<D> where D: ByteArray { /// Encrypt using a cipher and provided key and nonce fn seal(plain_text: &D, key: &[u8], nonce: &[u8]) -> Result<Vec<u8>, CipherError>; /// Decrypt using a cipher and provided key and nonce fn open(cipher_text: &[u8], key: &[u8], nonce: &[u8]) -> Result<D, CipherError>; /// Encrypt using a cipher and provided key, the nonce will be generate internally and appended to the cipher text fn seal_with_integral_nonce(plain_text: &D, key: &[u8]) -> Result<Vec<u8>, CipherError>; /// Decrypt using a cipher and provided key. The integral nonce will be read from the cipher text fn open_with_integral_nonce(cipher_text: &[u8], key: &[u8]) -> Result<D, CipherError>; }