add ring::sha256

ring/src/main.rs

@@ -1,6 +1,11 @@
-use ring::{hmac, rand, error::Unspecified};
+use ring::{
+    hmac, rand, error::Unspecified,
+    digest,
+};
 
 fn main() -> Result<(), Unspecified> {
+    {
+        println!("{} HHmac {}", "-".repeat(10), "-".repeat(10));
         let rng = rand::SystemRandom::new();
         let key = hmac::Key::generate(hmac::HMAC_SHA256, &rng)?;
 
@@ -10,6 +15,12 @@ fn main() -> Result<(), Unspecified> {
         println!("{:?}", tag);
         hmac::verify(&key, msg.as_bytes(), tag.as_ref())?;
         println!("Verify success");
+    }
+    {
+        println!("{} SHA256 {}", "-".repeat(10), "-".repeat(10));
+        let sha256 = digest::digest(&digest::SHA256, b"hello, world");
+        println!("{:?}", sha256);
+    }
 
     Ok(())
 }