Add did:ion and Sidetree

Cargo.toml

@@ -99,6 +99,7 @@ members = [
   "did-sol",
   "did-pkh",
   "did-onion",
+  "did-ion",
   "did-webkey",
   "vc-test",
   "did-test",

did-ion/Cargo.toml

@@ -0,0 +1,33 @@
+[package]
+name = "did-ion"
+version = "0.1.0"
+authors = ["Spruce Systems, Inc."]
+edition = "2021"
+license = "Apache-2.0"
+keywords = ["ssi", "did"]
+categories = ["web-programming::http-client"]
+description = "did:ion DID method implementation, using the ssi crate and ION/Sidetree REST API"
+repository = "https://github.com/spruceid/ssi/"
+homepage = "https://github.com/spruceid/ssi/tree/main/did-ion/"
+documentation = "https://docs.rs/did-ion/"
+
+[features]
+
+[dependencies]
+ssi = { version = "0.3", path = "../", default-features = false, features = ["http-did", "secp256k1"] }
+async-trait = "0.1"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+serde_jcs = "0.1"
+anyhow = "1.0"
+base64 = "0.12"
+sha2 = "0.10"
+json-patch = "0.2.6"
+reqwest = { version = "0.11", features = ["json"] }
+
+[target.'cfg(target_os = "android")'.dependencies.reqwest]
+version = "0.11"
+features = ["json", "native-tls-vendored"]
+
+[dev-dependencies]
+lazy_static = "1.4"

did-ion/README.md

@@ -0,0 +1,17 @@
+# did-ion
+
+Rust implementation of the [did:ion][] [DID Method][], based on the [ssi][] library.
+
+## Requirements
+
+An ION node is needed, that is a [Sidetree REST API][] provider. The URL for
+the ION/Sidetree node is to be stored in config TBD.
+
+## License
+
+[Apache License, Version 2.0](http://www.apache.org/licenses/)
+
+[did:ion]: https://identity.foundation/ion/
+[DID Method]: https://www.w3.org/TR/did-core/#methods
+[ssi]: https://github.com/spruceid/ssi/
+[Sidetree REST API]: https://identity.foundation/sidetree/api/

did-ion/src/lib.rs

@@ -0,0 +1,26 @@
+use anyhow::{ensure, Context, Error, Result};
+use ssi::jwk::{Algorithm, JWK};
+
+pub mod sidetree;
+
+use sidetree::{is_secp256k1, Sidetree, SidetreeClient};
+
+pub struct ION;
+
+/// did:ion Method
+pub type DIDION = SidetreeClient<ION>;
+
+impl Sidetree for ION {
+    fn generate_key() -> Result<JWK, Error> {
+        JWK::generate_secp256k1().context("Generate secp256k1 key")
+    }
+
+    fn validate_key(key: &JWK) -> Result<(), Error> {
+        ensure!(is_secp256k1(&key), "Key must be Secp256k1 for ION");
+        Ok(())
+    }
+
+    const SIGNATURE_ALGORITHM: Algorithm = Algorithm::ES256K;
+    const METHOD: &'static str = "ion";
+    const NETWORK: Option<&'static str> = Some("test");
+}