Consolidate crypto functionality in ethcore-crypto. (#8432)

* Consolidate crypto functionality in `ethcore-crypto`.

- Move `ecdh`/`ecies` modules to `ethkey`.
- Refactor `ethcore-crypto` to use file per module.
- Replace `subtle` with `ethcore_crypto::is_equal`.
- Add `aes_gcm` module to `ethcore-crypto`.

* Rename `aes::{encrypt,decrypt,decrypt_cbc}` ...

... to `aes::{encrypt_128_ctr,decrypt_128_ctr,decrypt_128_cbc}`.

Author: twittner

Cargo.lock

@@ -20,6 +20,7 @@ fetch = { path = "../util/fetch" }
 hashdb = { path = "../util/hashdb" }
 memorydb = { path = "../util/memorydb" }
 patricia-trie = { path = "../util/patricia_trie" }
+ethcore-crypto = { path = "crypto" }
 error-chain = { version = "0.11", default-features = false }
 ethcore-io = { path = "../util/io" }
 ethcore-logger = { path = "../logger" }
@@ -56,7 +57,6 @@ util-error = { path = "../util/error" }
 snappy = { git = "https://github.com/paritytech/rust-snappy" }
 stop-guard = { path = "../util/stop-guard" }
 macros = { path = "../util/macros" }
-rust-crypto = "0.2.34"
 rustc-hex = "1.0"
 stats = { path = "../util/stats" }
 trace-time = { path = "../util/trace-time" }

ethcore/Cargo.toml

@@ -20,7 +20,7 @@ extern crate test;
 extern crate ethcore_util as util;
 extern crate rand;
 extern crate bn;
-extern crate crypto;
+extern crate ethcore_crypto;
 extern crate ethkey;
 extern crate rustc_hex;
 extern crate ethcore_bigint;
@@ -61,16 +61,13 @@ fn bn_128_mul(b: &mut Bencher) {
 
 #[bench]
 fn sha256(b: &mut Bencher) {
-	use crypto::sha2::Sha256;
-	use crypto::digest::Digest;
+	use ethcore_crypto::digest::sha256;
 
 	let mut input: [u8; 256] = [0; 256];
 	let mut out = [0; 32];
 
 	b.iter(|| {
-		let mut sha = Sha256::new();
-		sha.input(&input);
-		sha.result(&mut input[0..32]);
+		sha256(&input);
 	});
 }
 

ethcore/benches/evm.rs

@@ -4,13 +4,9 @@ version = "0.1.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 
 [dependencies]
+ethereum-types = "0.3"
+quick-error = "1.2"
+ring = "0.12"
 rust-crypto = "0.2.36"
 tiny-keccak = "1.3"
-eth-secp256k1 = { git = "https://github.com/paritytech/rust-secp256k1", optional = true }
-ethkey = { path = "../../ethkey", optional = true }
-ethereum-types = "0.3"
-subtle = "0.5"
 
-[features]
-default = ["secp256k1"]
-secp256k1 = ["eth-secp256k1", "ethkey"]

ethcore/crypto/Cargo.toml

@@ -0,0 +1,54 @@
+// Copyright 2015-2017 Parity Technologies (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+use error::SymmError;
+use rcrypto::blockmodes::{CtrMode, CbcDecryptor, PkcsPadding};
+use rcrypto::aessafe::{AesSafe128Encryptor, AesSafe128Decryptor};
+use rcrypto::symmetriccipher::{Encryptor, Decryptor};
+use rcrypto::buffer::{RefReadBuffer, RefWriteBuffer, WriteBuffer};
+
+/// Encrypt a message (CTR mode).
+///
+/// Key (`k`) length and initialisation vector (`iv`) length have to be 16 bytes each.
+/// An error is returned if the input lengths are invalid.
+pub fn encrypt_128_ctr(k: &[u8], iv: &[u8], plain: &[u8], dest: &mut [u8]) -> Result<(), SymmError> {
+	let mut encryptor = CtrMode::new(AesSafe128Encryptor::new(k), iv.to_vec());
+	encryptor.encrypt(&mut RefReadBuffer::new(plain), &mut RefWriteBuffer::new(dest), true)?;
+	Ok(())
+}
+
+/// Decrypt a message (CTR mode).
+///
+/// Key (`k`) length and initialisation vector (`iv`) length have to be 16 bytes each.
+/// An error is returned if the input lengths are invalid.
+pub fn decrypt_128_ctr(k: &[u8], iv: &[u8], encrypted: &[u8], dest: &mut [u8]) -> Result<(), SymmError> {
+	let mut encryptor = CtrMode::new(AesSafe128Encryptor::new(k), iv.to_vec());
+	encryptor.decrypt(&mut RefReadBuffer::new(encrypted), &mut RefWriteBuffer::new(dest), true)?;
+	Ok(())
+}
+
+/// Decrypt a message (CBC mode).
+///
+/// Key (`k`) length and initialisation vector (`iv`) length have to be 16 bytes each.
+/// An error is returned if the input lengths are invalid.
+pub fn decrypt_128_cbc(k: &[u8], iv: &[u8], encrypted: &[u8], dest: &mut [u8]) -> Result<usize, SymmError> {
+	let mut encryptor = CbcDecryptor::new(AesSafe128Decryptor::new(k), PkcsPadding, iv.to_vec());
+	let len = dest.len();
+	let mut buffer = RefWriteBuffer::new(dest);
+	encryptor.decrypt(&mut RefReadBuffer::new(encrypted), &mut buffer, true)?;
+	Ok(len - buffer.remaining())
+}
+