diff --git a/Cargo.toml b/Cargo.toml
index 85d3ad2..875d87c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -63,7 +63,7 @@ which = "7.0.3"
 percent-encoding = "2.3.1"
 external-command-rs = "0.1.1"
 ssh-agent-lib = { version =  "0.5.1" }
-ssh-key = { version = "0.6", features = ["ecdsa"] }
+ssh-key = { version = "0.6", features = ["ecdsa", "alloc"] }
 tokio = "1.45.1"
 ssh-encoding = { version = "0.2.0", features = ["alloc"] }
 #lazy_static = "1.4.0"
diff --git a/src/cmd_ssh_agent.rs b/src/cmd_ssh_agent.rs
index 0244e70..f3106ea 100644
--- a/src/cmd_ssh_agent.rs
+++ b/src/cmd_ssh_agent.rs
@@ -1,19 +1,24 @@
 use std::fs::remove_file;
 use std::path::PathBuf;
 
-use clap::{App, Arg, ArgMatches, SubCommand};
-
-use crate::ecdsautil::{generate_ecdsa_keypair, parse_ecdsa_r_and_s, EcdsaAlgorithm};
+use crate::ecdsautil::{
+    generate_ecdsa_keypair, parse_ec_public_key_to_point, parse_ecdsa_r_and_s, EcdsaAlgorithm,
+};
 use crate::util::base64_encode;
+use clap::{App, Arg, ArgMatches, SubCommand};
+use rsa::RsaPublicKey;
 use rust_util::util_clap::{Command, CommandError};
 use rust_util::XResult;
+use spki::DecodePublicKey;
 use ssh_agent_lib::agent::{listen, Session};
 use ssh_agent_lib::error::AgentError;
 use ssh_agent_lib::proto::{Extension, Identity, SignRequest};
 use ssh_agent_lib::ssh_encoding::Encode;
 use ssh_agent_lib::ssh_key::public::KeyData;
 use ssh_agent_lib::ssh_key::{Algorithm, Signature};
+use ssh_key::public::EcdsaPublicKey;
 use ssh_key::{EcdsaCurve, Mpint};
+use std::convert::TryFrom;
 use tokio::net::UnixListener as Listener;
 
 #[derive(Default, Clone)]
@@ -44,9 +49,7 @@ f17326c188b9d0cffeddd8ff935f24f2074bbef128ac5b04b9cac05de967df5dbfd065698dce3b8c
         )
         .unwrap();
         let identity = Identity {
-            pubkey: KeyData::Ecdsa(
-                ssh_key::public::EcdsaPublicKey::from_sec1_bytes(&public_key_point).unwrap(),
-            ),
+            pubkey: KeyData::Ecdsa(EcdsaPublicKey::from_sec1_bytes(&public_key_point).unwrap()),
             comment: "test".to_string(),
         };
         let mut writer = vec![];
@@ -61,8 +64,11 @@ f17326c188b9d0cffeddd8ff935f24f2074bbef128ac5b04b9cac05de967df5dbfd065698dce3b8c
         let algorithm = &request.pubkey.algorithm();
         match algorithm {
             Algorithm::Ecdsa { curve: _ } => {}
-            Algorithm::Ed25519 => {}
             Algorithm::Rsa { hash: _ } => {}
+            Algorithm::Ed25519 => {
+                debugging!("Algorithm::Ed25519 not supported");
+                return Err(AgentError::Failure);
+            }
             Algorithm::Dsa => {
                 debugging!("Algorithm::Dsa not supported");
                 return Err(AgentError::Failure);
@@ -117,6 +123,24 @@ f17326c188b9d0cffeddd8ff935f24f2074bbef128ac5b04b9cac05de967df5dbfd065698dce3b8c
     }
 }
 
+fn get_identity(uri: &str) -> XResult<Identity> {
+    let public_key_bytes = external_command_rs::external_public_key("card-cli", uri)?;
+
+    let ec_point = parse_ec_public_key_to_point(&public_key_bytes).unwrap(); // TODO ...
+    let identity = Identity {
+        pubkey: KeyData::Ecdsa(EcdsaPublicKey::from_sec1_bytes(&ec_point).unwrap()),
+        comment: "test".to_string(),
+    };
+
+    let rsa_public_key = RsaPublicKey::from_public_key_der(&public_key_bytes).unwrap();
+    let identity = Identity {
+        pubkey: KeyData::Rsa(ssh_key::public::RsaPublicKey::try_from(&rsa_public_key).unwrap()),
+        comment: "test".to_string(),
+    };
+
+    simple_error!("Unknown uri algorithm: {}", uri)
+}
+
 pub struct CommandImpl;
 
 impl Command for CommandImpl {
diff --git a/src/ecdsautil.rs b/src/ecdsautil.rs
index 7f762d5..cb20d15 100644
--- a/src/ecdsautil.rs
+++ b/src/ecdsautil.rs
@@ -94,6 +94,36 @@ pub fn generate_ecdsa_keypair(algo: EcdsaAlgorithm) -> XResult<(String, String,
     }
 }
 
+pub fn parse_ec_public_key_to_point(public_key_bytes: &[u8]) -> XResult<Vec<u8>> {
+    match parse_p521_public_key_to_point(public_key_bytes) {
+        Ok(point) => Ok(point),
+        Err(_) => match parse_p384_public_key_to_point(public_key_bytes) {
+            Ok(point) => Ok(point),
+            Err(_) => parse_p256_public_key_to_point(public_key_bytes),
+        }
+    }
+}
+
+pub fn parse_p256_public_key_to_point(public_key_bytes: &[u8]) -> XResult<Vec<u8>> {
+    use p256::{PublicKey, elliptic_curve::sec1::ToEncodedPoint};
+    use spki::DecodePublicKey;
+    let public_key = PublicKey::from_public_key_der(public_key_bytes)?;
+    Ok(public_key.to_encoded_point(false).as_bytes().to_vec())
+}
+
+pub fn parse_p384_public_key_to_point(public_key_bytes: &[u8]) -> XResult<Vec<u8>> {
+    use p384::{PublicKey, elliptic_curve::sec1::ToEncodedPoint};
+    use spki::DecodePublicKey;
+    let public_key = PublicKey::from_public_key_der(public_key_bytes)?;
+    Ok(public_key.to_encoded_point(false).as_bytes().to_vec())
+}
+
+pub fn parse_p521_public_key_to_point(public_key_bytes: &[u8]) -> XResult<Vec<u8>> {
+    use p521::{PublicKey, elliptic_curve::sec1::ToEncodedPoint};
+    use spki::DecodePublicKey;
+    let public_key = PublicKey::from_public_key_der(public_key_bytes)?;
+    Ok(public_key.to_encoded_point(false).as_bytes().to_vec())
+}
 
 macro_rules! parse_ecdsa_private_key_to_public_key {
     ($algo: tt, $parse_ecdsa_private_key: tt) => ({
diff --git a/src/rsautil.rs b/src/rsautil.rs
index 2e9e6bf..f365b3d 100644
--- a/src/rsautil.rs
+++ b/src/rsautil.rs
@@ -226,7 +226,7 @@ pub fn rsa_public_key_to_jwk(rsa_public_key: &RsaPublicKey) -> XResult<String> {
     Ok(serde_json::to_string(&jwk).unwrap())
 }
 
-fn try_parse_rsa(public_key: &str) -> XResult<RsaPublicKey> {
+pub fn try_parse_rsa(public_key: &str) -> XResult<RsaPublicKey> {
     debugging!("Try parse RSA public key PEM.");
     // parse RSA public key PEM not works? why?
     if let Ok(rsa_public_key) = RsaPublicKey::from_public_key_pem(public_key) {