EIP-2386 (draft): Eth2 wallet (#1117)

* Add test to understand flow of key storage

* First commit

* Committing to save trait stuff

* Working naive design

* Add keystore struct

* Move keystore files into their own module

* Add serde (de)serialize_with magic

* Add keystore test

* Fix tests

* Add comments and minor fixes

* Pass optional params to `to_keystore` function

* Add `path` field to keystore

* Add function to read Keystore from file

* Add test vectors and fix Version serialization

* Checksum params is empty object

* Add public key to Keystore

* Add function for saving keystore into file

* Deleted account_manager main.rs

* Move keystore module to validator_client

* Add save_keystore method to validator_directory

* Add load_keystore function. Minor refactorings

* Fixed dependencies

* Address some review comments

* Add Password newtype; derive Zeroize

* Fix test

* Move keystore into own crate

* Remove padding

* Add error enum, zeroize more things

* Fix comment

* Add keystore builder

* Remove keystore stuff from val client

* Add more tests, comments

* Add more comments, test vectors

* Progress on improving JSON validation

* More JSON verification

* Start moving JSON into own mod

* Remove old code

* Add more tests, reader/writers

* Tidy

* Move keystore into own file

* Move more logic into keystore file

* Tidy

* Tidy

* Allow for odd-character hex

* Add more json missing field checks

* Use scrypt by default

* Tidy, address comments

* Test path and uuid in vectors

* Fix comment

* Add checks for kdf params

* Enforce empty kdf message

* Expose json_keystore mod

* First commits on path derivation

* Progress with implementation

* More progress

* Passing intermediate test vectors

* Tidy, add comments

* Add DerivedKey structs

* Move key derivation into own crate

* Add zeroize structs

* Return error for empty seed

* Add tests

* Tidy

* First commits on path derivation

* Progress with implementation

* Move key derivation into own crate

* Start defining JSON wallet

* Add progress

* Split out encrypt/decrypt

* First commits on path derivation

* Progress with implementation

* More progress

* Passing intermediate test vectors

* Tidy, add comments

* Add DerivedKey structs

* Move key derivation into own crate

* Add zeroize structs

* Return error for empty seed

* Add tests

* Tidy

* Add progress

* Replace some password usage with slice

* First commits on path derivation

* Progress with implementation

* More progress

* Passing intermediate test vectors

* Tidy, add comments

* Add DerivedKey structs

* Move key derivation into own crate

* Add zeroize structs

* Return error for empty seed

* Add tests

* Tidy

* Add progress

* Expose PlainText struct

* First commits on path derivation

* Progress with implementation

* More progress

* Passing intermediate test vectors

* Tidy, add comments

* Add DerivedKey structs

* Move key derivation into own crate

* Add zeroize structs

* Return error for empty seed

* Add tests

* Tidy

* Add builder

* Expose consts, remove Password

* Minor progress

* Expose SALT_SIZE

* First compiling version

* Add test vectors

* Move dbg assert statement

* Add mnemonic, tidy

* Tidy

* Add testing

* Fix broken test

* Address review comments

Co-authored-by: pawan <pawandhananjay@gmail.com>

Cargo.lock

@@ -1368,6 +1368,23 @@ dependencies = [
  "types",
 ]
 
+[[package]]
+name = "eth2_wallet"
+version = "0.1.0"
+dependencies = [
+ "eth2_key_derivation",
+ "eth2_keystore",
+ "eth2_ssz",
+ "hex 0.3.2",
+ "rand 0.7.3",
+ "serde",
+ "serde_json",
+ "serde_repr",
+ "tempfile",
+ "tiny-bip39",
+ "uuid 0.8.1",
+]
+
 [[package]]
 name = "ethabi"
 version = "12.0.0"
@@ -2925,6 +2942,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "once_cell"
+version = "1.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b1c601810575c99596d4afc46f78a678c80105117c379eb3650cf99b8a21ce5b"
+dependencies = [
+ "parking_lot 0.9.0",
+]
+
 [[package]]
 name = "oorandom"
 version = "11.1.1"
@@ -3117,6 +3143,16 @@ dependencies = [
  "winapi 0.3.8",
 ]
 
+[[package]]
+name = "pbkdf2"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "006c038a43a45995a9670da19e67600114740e8511d4333bf97a56e66a7542d9"
+dependencies = [
+ "byteorder 1.3.4",
+ "crypto-mac",
+]
+
 [[package]]
 name = "percent-encoding"
 version = "1.0.1"
@@ -3735,6 +3771,12 @@ version = "0.1.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4c691c0e608126e00913e33f0ccf3727d5fc84573623b8d65b2df340b5201783"
 
+[[package]]
+name = "rustc-hash"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
+
 [[package]]
 name = "rustc-hex"
 version = "2.1.0"
@@ -4505,6 +4547,22 @@ dependencies = [
  "types",
 ]
 
+[[package]]
+name = "tiny-bip39"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0165e045cc2ae1660270ca65e1676dbaab60feb0f91b10f7d0665e9b47e31f2"
+dependencies = [
+ "failure",
+ "hmac",
+ "once_cell",
+ "pbkdf2",
+ "rand 0.7.3",
+ "rustc-hash",
+ "sha2",
+ "unicode-normalization",
+]
+
 [[package]]
 name = "tiny-keccak"
 version = "1.5.0"