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}`.

rpc/src/v1/impls/light/parity.rs

@@ -20,8 +20,8 @@ use std::collections::{BTreeMap, HashSet};
 
 use version::version_data;
 
-use crypto::{ecies, DEFAULT_MAC};
-use ethkey::{Brain, Generator};
+use crypto::DEFAULT_MAC;
+use ethkey::{crypto::ecies, Brain, Generator};
 use ethstore::random_phrase;
 use sync::LightSyncProvider;
 use ethcore::account_provider::AccountProvider;

rpc/src/v1/impls/parity.rs

@@ -22,8 +22,8 @@ use std::collections::{BTreeMap, HashSet};
 use ethereum_types::Address;
 use version::version_data;
 
-use crypto::{DEFAULT_MAC, ecies};
-use ethkey::{Brain, Generator};
+use crypto::DEFAULT_MAC;
+use ethkey::{crypto::ecies, Brain, Generator};
 use ethstore::random_phrase;
 use sync::{SyncProvider, ManageNetwork};
 use ethcore::account_provider::AccountProvider;