feat: add examples

examples/private_ecdsa_sign.rs

@@ -0,0 +1,13 @@
+use base64::Engine;
+use swift_secure_enclave_tool_rs::private_key_ecdsa_sign;
+
+fn main() {
+    let args = std::env::args().collect::<Vec<_>>();
+    let private_key_representation = base64::engine::general_purpose::STANDARD
+        .decode(&args[1])
+        .unwrap();
+
+    let signature = private_key_ecdsa_sign(&private_key_representation, b"hello world").unwrap();
+
+    println!("{}", hex::encode(&signature));
+}

examples/recover_ecdh.rs

@@ -1,3 +1,12 @@
+use base64::Engine;
+use swift_secure_enclave_tool_rs::{recover_ecdsa_keypair, KeyPurpose};
+
 fn main() {
-    
+    let args = std::env::args().collect::<Vec<_>>();
-}
+    let private_key_representation = base64::engine::general_purpose::STANDARD
+        .decode(&args[1])
+        .unwrap();
+    let key_material =
+        recover_ecdsa_keypair(KeyPurpose::KeyAgreement, &private_key_representation).unwrap();
+    println!("{:?}", key_material)
+}

examples/recover_ecdsa.rs

@@ -1,3 +1,12 @@
+use base64::Engine;
+use swift_secure_enclave_tool_rs::{recover_ecdsa_keypair, KeyPurpose};
+
 fn main() {
-    
+    let args = std::env::args().collect::<Vec<_>>();
-}
+    let private_key_representation = base64::engine::general_purpose::STANDARD
+        .decode(&args[1])
+        .unwrap();
+    let key_material =
+        recover_ecdsa_keypair(KeyPurpose::Signing, &private_key_representation).unwrap();
+    println!("{:?}", key_material)
+}