diff --git a/acme_common/src/crypto/openssl_keys.rs b/acme_common/src/crypto/openssl_keys.rs
index 9e6ca39..368c4ce 100644
--- a/acme_common/src/crypto/openssl_keys.rs
+++ b/acme_common/src/crypto/openssl_keys.rs
@@ -8,6 +8,7 @@ use openssl::nid::Nid;
 use openssl::pkey::{Id, PKey, Private};
 use openssl::rsa::Rsa;
 use serde_json::json;
+use serde_json::value::Value;
 
 macro_rules! get_key_type {
     ($key: expr) => {
@@ -76,39 +77,28 @@ impl KeyPair {
         }
     }
 
-    pub fn get_jwk_thumbprint(&self) -> Result<String, Error> {
-        // TODO: implement Curve25519 and RSA JWK thumbprint
+    pub fn jwk_public_key(&self) -> Result<Value, Error> {
+        self.get_jwk_public_key(false)
+    }
+
+    pub fn jwk_public_key_thumbprint(&self) -> Result<Value, Error> {
+        self.get_jwk_public_key(true)
+    }
+
+    fn get_jwk_public_key(&self, thumbprint: bool) -> Result<Value, Error> {
         match self.key_type {
             KeyType::Curve25519 => Err("Curve25519 thumbprint are not implemented yet".into()),
-            KeyType::EcdsaP256 | KeyType::EcdsaP384 => self.get_nist_ec_jwk(),
+            KeyType::EcdsaP256 | KeyType::EcdsaP384 => self.get_nist_ec_jwk(thumbprint),
             KeyType::Rsa2048 | KeyType::Rsa4096 => {
                 Err("RSA jwk thumbprint are not implemented yet".into())
             }
         }
     }
 
-    fn get_nist_ec_jwk(&self) -> Result<String, Error> {
-        let (x, y) = self.get_nist_ec_coordinates()?;
-        let crv = match self.key_type {
-            KeyType::EcdsaP256 => "P-256",
-            KeyType::EcdsaP384 => "P-384",
-            _ => {
-                return Err("Not a NIST elliptic curve.".into());
-            }
-        };
-        let jwk = json!({
-            "crv": crv,
-            "kty": "EC",
-            "x": x,
-            "y": y,
-        });
-        Ok(jwk.to_string())
-    }
-
-    pub fn get_nist_ec_coordinates(&self) -> Result<(String, String), Error> {
-        let curve = match self.key_type {
-            KeyType::EcdsaP256 => Nid::X9_62_PRIME256V1,
-            KeyType::EcdsaP384 => Nid::SECP384R1,
+    fn get_nist_ec_jwk(&self, thumbprint: bool) -> Result<Value, Error> {
+        let (crv, curve) = match self.key_type {
+            KeyType::EcdsaP256 => ("P-256", Nid::X9_62_PRIME256V1),
+            KeyType::EcdsaP384 => ("P-384", Nid::SECP384R1),
             _ => {
                 return Err("Not a NIST elliptic curve.".into());
             }
@@ -124,7 +114,24 @@ impl KeyPair {
             .affine_coordinates_gfp(&group, &mut x, &mut y, &mut ctx)?;
         let x = b64_encode(&x.to_vec());
         let y = b64_encode(&y.to_vec());
-        Ok((x, y))
+        let jwk = if thumbprint {
+            json!({
+                "crv": crv,
+                "kty": "EC",
+                "x": x,
+                "y": y,
+            })
+        } else {
+            json!({
+                "alg": "ES256",
+                "crv": crv,
+                "kty": "EC",
+                "use": "sig",
+                "x": x,
+                "y": y,
+            })
+        };
+        Ok(jwk)
     }
 }
 
diff --git a/acmed/src/acme_proto/structs/authorization.rs b/acmed/src/acme_proto/structs/authorization.rs
index 656129d..42b69b5 100644
--- a/acmed/src/acme_proto/structs/authorization.rs
+++ b/acmed/src/acme_proto/structs/authorization.rs
@@ -155,8 +155,8 @@ pub struct TokenChallenge {
 
 impl TokenChallenge {
     fn key_authorization(&self, key_pair: &KeyPair) -> Result<String, Error> {
-        let thumbprint = key_pair.get_jwk_thumbprint()?;
-        let thumbprint = sha256(thumbprint.as_bytes());
+        let thumbprint = key_pair.jwk_public_key_thumbprint()?;
+        let thumbprint = sha256(thumbprint.to_string().as_bytes());
         let thumbprint = b64_encode(&thumbprint);
         let auth = format!("{}.{}", self.token, thumbprint);
         Ok(auth)
diff --git a/acmed/src/jws.rs b/acmed/src/jws.rs
index 31617d4..3638cab 100644
--- a/acmed/src/jws.rs
+++ b/acmed/src/jws.rs
@@ -3,9 +3,9 @@ use acme_common::b64_encode;
 use acme_common::crypto::{sha256, KeyPair};
 use acme_common::error::Error;
 use serde::Serialize;
+use serde_json::value::Value;
 
 pub mod algorithms;
-mod jwk;
 
 #[derive(Serialize)]
 struct JwsData {
@@ -17,7 +17,7 @@ struct JwsData {
 #[derive(Serialize)]
 struct JwsProtectedHeaderJwk {
     alg: String,
-    jwk: jwk::Jwk,
+    jwk: Value,
     nonce: String,
     url: String,
 }
@@ -55,7 +55,7 @@ pub fn encode_jwk(
     let sign_alg = SignatureAlgorithm::from_pkey(key_pair)?;
     let protected = JwsProtectedHeaderJwk {
         alg: sign_alg.to_string(),
-        jwk: sign_alg.get_jwk(key_pair)?,
+        jwk: key_pair.jwk_public_key()?,
         nonce: nonce.into(),
         url: url.into(),
     };
diff --git a/acmed/src/jws/algorithms.rs b/acmed/src/jws/algorithms.rs
index aed4ffd..fa04648 100644
--- a/acmed/src/jws/algorithms.rs
+++ b/acmed/src/jws/algorithms.rs
@@ -1,4 +1,3 @@
-use super::jwk::{Es256Jwk, Jwk};
 use acme_common::crypto::{gen_keypair, KeyPair, KeyType};
 use acme_common::error::Error;
 use std::fmt;
@@ -37,12 +36,6 @@ impl SignatureAlgorithm {
         }
     }
 
-    pub fn get_jwk(&self, key_pair: &KeyPair) -> Result<Jwk, Error> {
-        let (x, y) = key_pair.get_nist_ec_coordinates()?;
-        let jwk = Jwk::Es256(Es256Jwk::new(&x, &y));
-        Ok(jwk)
-    }
-
     pub fn gen_key_pair(&self) -> Result<KeyPair, Error> {
         match self {
             SignatureAlgorithm::Es256 => gen_keypair(KeyType::EcdsaP256),
diff --git a/acmed/src/jws/jwk.rs b/acmed/src/jws/jwk.rs
deleted file mode 100644
index 7448bf3..0000000
--- a/acmed/src/jws/jwk.rs
+++ /dev/null
@@ -1,31 +0,0 @@
-use serde::Serialize;
-
-#[derive(Serialize)]
-#[serde(untagged)]
-pub enum Jwk {
-    Es256(Es256Jwk),
-}
-
-#[derive(Serialize)]
-pub struct Es256Jwk {
-    kty: String,
-    #[serde(rename = "use")]
-    jwk_use: String,
-    crv: String,
-    alg: String,
-    x: String,
-    y: String,
-}
-
-impl Es256Jwk {
-    pub fn new(x: &str, y: &str) -> Self {
-        Es256Jwk {
-            kty: "EC".into(),
-            jwk_use: "sig".into(),
-            crv: "P-256".into(),
-            alg: "ES256".into(),
-            x: x.to_string(),
-            y: y.to_string(),
-        }
-    }
-}