feat: add efficient_sm2

__crypto/efficient_sm2/src/main.rs

@@ -0,0 +1,17 @@
+use rand::RngCore;
+
+fn main() {
+    let test_word = b"hello world";
+
+    let mut private_key = [0; 32];
+    rand::thread_rng().fill_bytes(&mut private_key);
+
+    let key_pair = efficient_sm2::KeyPair::new(&private_key).unwrap();
+
+    // signing in sm2
+    let sig = key_pair.sign(test_word).unwrap();
+
+    // verification sm2 signature
+    sig.verify(&key_pair.public_key(), test_word).unwrap();
+}
+