support ed25519 signing

- [x] modularity
  - [x] crypto operation is in one mod. algorithm includes ed25519 secp256k1 and more。struct includes secret_key public_key and pair_key.
  - [x] errors is in one mod，and in the crypto directory。
  - [x] crypto mod only handle related operations of sign. no associated with specific chain.
- [x] interface adjustment
   - unify key string format：key_type:encode_type:xxxxxxxxx
- [ ] detailed document

issue: Problem: ed25519-signing is not supported #415

common/Cargo.toml

@@ -44,6 +44,9 @@ url = "2"
 # grpc-web-client would be replaced if tonic has native grpc-web support.
 # Check https://github.com/hyperium/tonic/issues/645
 grpc-web-client = { git = "https://github.com/titanous/grpc-web-client"}
+ed25519-dalek = "1.0"
+bs58 = "0.4"
+hex = "0.4"
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 cosmos-sdk-proto = { version = "0.10", default-features = false, features = ["cosmwasm"] }
@@ -59,7 +62,7 @@ cosmos-sdk-proto = { version = "0.10", features = ["grpc"] }
 defi-wallet-core-proto = { version = "0.1", path = "../proto", features = ["transport"] }
 # NOTE: crate `bip39` cannot work with latest crate `rand` (0.8.0)
 # FIXME: https://github.com/rust-bitcoin/rust-bip39/issues/14
-rand = "0.6"
+rand = { version = "0.6", features = ["std"] }
 tokio = { version = "1", features = ["rt"] }
 tonic = { version = "0.6", default-features = false, features = ["codegen", "prost", "tls", "tls-roots", "transport"] }
 

common/src/crypto/errors.rs

@@ -0,0 +1,32 @@
+use super::KeyType;
+use super::EncodeType;
+
+
+/// uniffi don't support Box<dyn std::error::Error> so convert a lower error to a string. discard the source
+#[derive(Debug, Clone, thiserror::Error)]
+pub enum ParseKeyError {
+    #[error("key_type: {key_type} {msg}")]
+    InvalidKeyBytes{key_type: KeyType, msg: String},
+    #[error("invalid format, colon_number expected 2 but {colon_number}. the format is key_type:encode_type:xxxxx")]
+    InvalidStringFormat{colon_number: u8},
+    #[error("unknown key type '{unknown_key_type}'")]
+    UnknownKeyType { unknown_key_type: String },
+    #[error("unknown encode type '{unknown_encode_type}'")]
+    UnknownEncodeType { unknown_encode_type: String },
+    #[error("invalid encode format: key_type: {key_type}  encode_type: {encode_type} cause: {cause}")]
+    InvalidEncodeFormat { key_type: KeyType, encode_type: EncodeType, cause: String },
+    #[error("invalid key length: expected the input of {expected_length} bytes, but {received_length} was given")]
+    InvalidLength { expected_length: usize, received_length: usize },
+    #[error("invalid key data: {error_message}")]
+    InvalidData { error_message: String },
+}
+
+#[derive(Debug, Clone, thiserror::Error)]
+pub enum ParseSignatureError {
+    #[error("unknown key type '{unknown_key_type}'")]
+    UnknownKeyType { unknown_key_type: String },
+    #[error("invalid signature length: expected the input of {expected_length} bytes, but {received_length} was given")]
+    InvalidLength { expected_length: usize, received_length: usize },
+    #[error("invalid signature data: {error_message}")]
+    InvalidData { error_message: String },
+}