Feat: fn sign message (#1038)

* Feat: fn sign message

* update.

* replace keccak256 with sha256.

* optimize.

src/components/finutils/src/bins/fn.rs

@@ -304,6 +304,10 @@ fn run() -> Result<()> {
         } else {
             common::setup(sa, om, tp).c(d!())?;
         }
+    } else if let Some(m) = matches.subcommand_matches("sign") {
+        let sk = m.value_of("sk");
+        let msg = m.value_of("message");
+        common::sign(sk.c(d!())?, msg.c(d!())?).c(d!())?;
     } else if let Some(m) = matches.subcommand_matches("transfer") {
         let f = match m.value_of("from-seckey") {
             Some(path) => {

src/components/finutils/src/bins/fn.yml

@@ -39,6 +39,23 @@ subcommands:
             long: validator-key
             takes_value: true
             value_name: Path
+  - sign:
+      about: Sign message
+      args:
+        - sk:
+            help: secret key in hex
+            short: s
+            long: secret-key
+            takes_value: true
+            value_name: SecretKey
+            required: true
+        - message:
+            help: the message string
+            short: m
+            long: message
+            takes_value: true
+            value_name: Message
+            required: true
   - stake:
       about: Stake tokens (i.e. bond tokens) from a Findora account to a Validator
       args:

src/components/finutils/src/common/mod.rs

@@ -6,7 +6,9 @@
 //! This module is the library part of FN.
 //!
 
+use sha3::{Digest, Keccak256};
 use std::str::FromStr;
+use zei::serialization::ZeiFromToBytes;
 
 #[cfg(not(target_arch = "wasm32"))]
 pub mod dev;
@@ -169,6 +171,32 @@ pub fn stake(
     utils::send_tx(&tx).c(d!())
 }
 
+/// Sign message using ed25519
+///     Secret Key
+///     Message
+pub fn sign(secret_key: &str, message: &str) -> Result<()> {
+    let pair =
+        XfrSecretKey::zei_from_bytes(hex::decode(secret_key).c(d!())?.as_slice())?
+            .into_keypair();
+
+    let msg_bytes = message.as_bytes();
+    let d = Keccak256::digest(msg_bytes);
+
+    let sig = pair.get_sk_ref().sign(d.as_slice(), pair.get_pk_ref());
+
+    let pk_hex = hex::encode(pair.get_pk_ref().zei_to_bytes());
+    let msg_hex = hex::encode(d.as_slice());
+    let sig_hex = hex::encode(sig.zei_to_bytes());
+
+    println!("message: 0x{}", hex::encode(msg_bytes));
+    println!("message hash: 0x{}", msg_hex);
+    println!("public key: 0x{}", pk_hex);
+    println!("signature: 0x{}", sig_hex);
+    println!("data: 0x{}{}{}", pk_hex, msg_hex, sig_hex);
+
+    Ok(())
+}
+
 /// Append more FRA token to the specified tendermint node
 pub fn stake_append(
     amount: &str,