54 lines
2.4 KiB
Rust
54 lines
2.4 KiB
Rust
// Copyright 2015-2018 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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use error::SymmError;
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use rcrypto::blockmodes::{CtrMode, CbcDecryptor, PkcsPadding};
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use rcrypto::aessafe::{AesSafe128Encryptor, AesSafe128Decryptor};
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use rcrypto::symmetriccipher::{Encryptor, Decryptor};
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use rcrypto::buffer::{RefReadBuffer, RefWriteBuffer, WriteBuffer};
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/// Encrypt a message (CTR mode).
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///
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/// Key (`k`) length and initialisation vector (`iv`) length have to be 16 bytes each.
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/// An error is returned if the input lengths are invalid.
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pub fn encrypt_128_ctr(k: &[u8], iv: &[u8], plain: &[u8], dest: &mut [u8]) -> Result<(), SymmError> {
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let mut encryptor = CtrMode::new(AesSafe128Encryptor::new(k), iv.to_vec());
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encryptor.encrypt(&mut RefReadBuffer::new(plain), &mut RefWriteBuffer::new(dest), true)?;
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Ok(())
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}
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/// Decrypt a message (CTR mode).
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///
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/// Key (`k`) length and initialisation vector (`iv`) length have to be 16 bytes each.
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/// An error is returned if the input lengths are invalid.
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pub fn decrypt_128_ctr(k: &[u8], iv: &[u8], encrypted: &[u8], dest: &mut [u8]) -> Result<(), SymmError> {
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let mut encryptor = CtrMode::new(AesSafe128Encryptor::new(k), iv.to_vec());
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encryptor.decrypt(&mut RefReadBuffer::new(encrypted), &mut RefWriteBuffer::new(dest), true)?;
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Ok(())
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}
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/// Decrypt a message (CBC mode).
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///
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/// Key (`k`) length and initialisation vector (`iv`) length have to be 16 bytes each.
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/// An error is returned if the input lengths are invalid.
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pub fn decrypt_128_cbc(k: &[u8], iv: &[u8], encrypted: &[u8], dest: &mut [u8]) -> Result<usize, SymmError> {
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let mut encryptor = CbcDecryptor::new(AesSafe128Decryptor::new(k), PkcsPadding, iv.to_vec());
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let len = dest.len();
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let mut buffer = RefWriteBuffer::new(dest);
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encryptor.decrypt(&mut RefReadBuffer::new(encrypted), &mut buffer, true)?;
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Ok(len - buffer.remaining())
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}
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