feat: add rsa

__crypto/rsa/src/main.rs

@@ -0,0 +1,18 @@
+use rsa::{PublicKey, RSAPublicKey, RSAPrivateKey, PaddingScheme};
+use rand::rngs::OsRng;
+
+fn main() {
+    let mut rng = OsRng;
+    let bits = 2048;
+    let priv_key = RSAPrivateKey::new(&mut rng, bits).expect("failed to generate a key");
+    let pub_key = RSAPublicKey::from(&priv_key);
+    
+    // Encrypt
+    let data = b"hello world";
+    let enc_data = pub_key.encrypt(&mut rng, PaddingScheme::new_pkcs1v15_encrypt(), &data[..]).expect("failed to encrypt");
+    assert_ne!(&data[..], &enc_data[..]);
+    
+    // Decrypt
+    let dec_data = priv_key.decrypt(PaddingScheme::new_pkcs1v15_encrypt(), &enc_data).expect("failed to decrypt");
+    assert_eq!(&data[..], &dec_data[..]);
+}