Add wasm bindings for Pubkey and Keypair

sdk/src/lib.rs

@@ -47,6 +47,7 @@ pub mod system_transaction;
 pub mod timing;
 pub mod transaction;
 pub mod transport;
+pub mod wasm;
 
 /// Same as `declare_id` except report that this id has been deprecated
 pub use solana_sdk_macro::declare_deprecated_id;

sdk/src/signer/keypair.rs

@@ -17,9 +17,11 @@ use {
         io::{Read, Write},
         path::Path,
     },
+    wasm_bindgen::prelude::*,
 };
 
 /// A vanilla Ed25519 key pair
+#[wasm_bindgen]
 #[derive(Debug)]
 pub struct Keypair(ed25519_dalek::Keypair);
 

sdk/src/wasm/keypair.rs

@@ -0,0 +1,34 @@
+//! `Keypair` Javascript interface
+#![cfg(target_arch = "wasm32")]
+#![allow(non_snake_case)]
+use {
+    crate::signer::{keypair::Keypair, Signer},
+    solana_program::{pubkey::Pubkey, wasm::display_to_jsvalue},
+    wasm_bindgen::prelude::*,
+};
+
+#[wasm_bindgen]
+impl Keypair {
+    /// Create a new `Keypair `
+    #[wasm_bindgen(constructor)]
+    pub fn constructor() -> Keypair {
+        Keypair::new()
+    }
+
+    /// Convert a `Keypair` to a `Uint8Array`
+    pub fn toBytes(&self) -> Box<[u8]> {
+        self.to_bytes().into()
+    }
+
+    /// Recover a `Keypair` from a `Uint8Array`
+    pub fn fromBytes(bytes: &[u8]) -> Result<Keypair, JsValue> {
+        Keypair::from_bytes(bytes).map_err(display_to_jsvalue)
+    }
+
+    /// Return the `Pubkey` for this `Keypair`
+    #[wasm_bindgen(js_name = pubkey)]
+    pub fn js_pubkey(&self) -> Pubkey {
+        // `wasm_bindgen` does not support traits (`Signer) yet
+        self.pubkey()
+    }
+}

sdk/src/wasm/mod.rs

@@ -0,0 +1,4 @@
+//! solana-sdk Javascript interface
+#![cfg(target_arch = "wasm32")]
+
+pub mod keypair;