diff --git a/ring/Cargo.lock b/ring/Cargo.lock
index 7d3cfea..1721424 100644
--- a/ring/Cargo.lock
+++ b/ring/Cargo.lock
@@ -18,6 +18,12 @@ version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
 
+[[package]]
+name = "hex"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "644f9158b2f133fd50f5fb3242878846d9eb792e445c893805ff0e3824006e35"
+
 [[package]]
 name = "js-sys"
 version = "0.3.39"
@@ -76,6 +82,7 @@ dependencies = [
 name = "ring"
 version = "0.1.0"
 dependencies = [
+ "hex",
  "ring 0.16.13",
 ]
 
diff --git a/ring/Cargo.toml b/ring/Cargo.toml
index 82bcdf4..6367a41 100644
--- a/ring/Cargo.toml
+++ b/ring/Cargo.toml
@@ -8,4 +8,4 @@ edition = "2018"
 
 [dependencies]
 ring = "0.16.13"
-
+hex = "0.4.2"
diff --git a/ring/src/main.rs b/ring/src/main.rs
index 7b4d1d0..b801a47 100644
--- a/ring/src/main.rs
+++ b/ring/src/main.rs
@@ -1,8 +1,11 @@
 use ring::{
+    signature::{ KeyPair, Ed25519KeyPair, UnparsedPublicKey, ED25519 },
     hmac, rand, error::Unspecified,
     digest,
 };
 
+const SEED_LEN: usize = 32;
+
 fn main() -> Result<(), Unspecified> {
     {
         println!("{} HHmac {}", "-".repeat(10), "-".repeat(10));
@@ -21,6 +24,17 @@ fn main() -> Result<(), Unspecified> {
         let sha256 = digest::digest(&digest::SHA256, b"hello, world");
         println!("{:?}", sha256);
     }
+    {
+        println!("{} EdDSA  {}", "-".repeat(10), "-".repeat(10));
+        let rng = rand::SystemRandom::new();
+        let seed: [u8; SEED_LEN] = rand::generate(&rng)?.expose();
+        let key_pair = Ed25519KeyPair::from_seed_unchecked(&seed)?;
+        let sig = key_pair.sign(&"hello world".as_bytes());
+        println!("{}", hex::encode(sig.as_ref()));
+        let public_key = key_pair.public_key().as_ref();
+        let verify_result = UnparsedPublicKey::new(&ED25519, &public_key).verify(&"hello world".as_bytes(), sig.as_ref());
+        println!("verify: {}", verify_result.is_ok());
+    }
 
     Ok(())
 }