feat: add RSA-4096 key generation support

src/constants.rs

@@ -62,8 +62,15 @@ pub enum MediaQuality {
 pub enum KeyGenType {
     #[default]
     Default = 0,
+
+    /// 2048-bit RSA.
     Rsa2048 = 1,
+
+    /// [Ed25519](https://ed25519.cr.yp.to/) signature and X25519 encryption.
     Ed25519 = 2,
+
+    /// 4096-bit RSA.
+    Rsa4096 = 3,
 }
 
 /// Video chat URL type.
@@ -231,6 +238,7 @@ mod tests {
         assert_eq!(KeyGenType::Default, KeyGenType::from_i32(0).unwrap());
         assert_eq!(KeyGenType::Rsa2048, KeyGenType::from_i32(1).unwrap());
         assert_eq!(KeyGenType::Ed25519, KeyGenType::from_i32(2).unwrap());
+        assert_eq!(KeyGenType::Rsa4096, KeyGenType::from_i32(3).unwrap());
     }
 
     #[test]

src/pgp.rs

@@ -142,6 +142,7 @@ pub struct KeyPair {
 pub(crate) fn create_keypair(addr: EmailAddress, keygen_type: KeyGenType) -> Result<KeyPair> {
     let (secret_key_type, public_key_type) = match keygen_type {
         KeyGenType::Rsa2048 => (PgpKeyType::Rsa(2048), PgpKeyType::Rsa(2048)),
+        KeyGenType::Rsa4096 => (PgpKeyType::Rsa(4096), PgpKeyType::Rsa(4096)),
         KeyGenType::Ed25519 | KeyGenType::Default => (PgpKeyType::EdDSA, PgpKeyType::ECDH),
     };