dep/crypto: add rsa impl in openssl

Signed-off-by: Xynnn007 <[email protected]>

attestation-agent/deps/crypto/src/native/rsa.rs

@@ -8,8 +8,9 @@ use openssl::{
     pkey::Private,
     rsa::{Padding, Rsa},
 };
+use zeroize::Zeroizing;
 
-use crate::PaddingMode;
+use crate::rsa::PaddingMode;
 
 #[derive(Debug, Clone)]
 pub struct RSAKeyPair {
@@ -44,4 +45,16 @@ impl RSAKeyPair {
     pub fn e(&self) -> Vec<u8> {
         self.private_key.e().to_vec()
     }
+
+    pub fn to_pkcs1_pem(&self) -> Result<Zeroizing<String>> {
+        let res = self.private_key.private_key_to_pem()?;
+        let pem = String::from_utf8(res)?;
+        Ok(Zeroizing::new(pem))
+    }
+
+    pub fn from_pkcs1_pem(pem: &str) -> Result<Self> {
+        let private_key = Rsa::<Private>::private_key_from_pem(pem.as_bytes())?;
+
+        Ok(Self { private_key })
+    }
 }