test: tested loading ECDSA key pair from text

key-pair-loader/README.md

@@ -0,0 +1,64 @@
+# KeyLoader
+
+KeyLoader provides utility methods to load keys from pem-formatted key texts.
+
+## ECDSA-based algorithm
+
+### Generate key pair
+
+#### Generate private key
+
+Generate a private key by `genpkey` command provided by OpenSSL:
+
+```shell
+openssl genpkey -algorithm EC -pkeyopt ec_paramgen_curve:P-256 -out ec_private_key.pem
+```
+
+The output of this command is a file called `ec_private_key.pem` and its content looks like the
+following:
+
+```text
+-----BEGIN PRIVATE KEY-----
+MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQgs79JlARgXEf6EDV7
++PHQCTHEMtqIoHOy1GZ1+ynQJ6yhRANCAARkA7GRY2i4gg8qx0XViAXUP9cPw9pn
+Jg1wfrQ41FaMyqVBejNYxvaLtamErF/ySimnjafMJ+VZCh34lBj6Ez8R
+-----END PRIVATE KEY-----
+```
+
+#### Generate public key by private key
+
+Export public key from private key with `ec` command provided by OpenSSL:
+
+```shell
+openssl ec -in ec_private_key.pem -pubout -out ec_public_key.pem
+```
+
+The output of this command is a file called `ec_public_key.pem` and its content looks like the
+following:
+
+```text
+-----BEGIN PUBLIC KEY-----
+MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEZAOxkWNouIIPKsdF1YgF1D/XD8Pa
+ZyYNcH60ONRWjMqlQXozWMb2i7WphKxf8kopp42nzCflWQod+JQY+hM/EQ==
+-----END PUBLIC KEY-----
+```
+
+#### Convert private key to EC formats which could be acceptable by Java
+
+Java's `PKCS8EncodedKeySpec` requires the private key to be in PKCS#8 format, while OpenSSL by
+default generates private keys in traditional PEM format. To convert the private key, run the
+following command:
+
+```shell
+openssl pkcs8 -topk8 -inform PEM -outform PEM -in ec_private_key.pem -out ec_private_key_pkcs8.pem -nocrypt
+```
+
+The converted private key will look like this:
+
+```text
+-----BEGIN PRIVATE KEY-----
+MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQgs79JlARgXEf6EDV7
++PHQCTHEMtqIoHOy1GZ1+ynQJ6yhRANCAARkA7GRY2i4gg8qx0XViAXUP9cPw9pn
+Jg1wfrQ41FaMyqVBejNYxvaLtamErF/ySimnjafMJ+VZCh34lBj6Ez8R
+-----END PRIVATE KEY-----
+```

key-pair-loader/src/main/java/com/onixbyte/security/impl/EcKeyLoader.java

@@ -55,12 +55,13 @@ public class EcKeyLoader implements KeyLoader {
 
     /**
      * Initialise a key loader for EC-based algorithms.
-     *
-     * @throws NoSuchAlgorithmException if no {@code Provider} supports a {@code KeyFactorySpi}
-     *                                  implementation for the specified algorithm
      */
-    public EcKeyLoader() throws NoSuchAlgorithmException {
-        this.keyFactory = KeyFactory.getInstance("EC");
+    public EcKeyLoader() {
+        try {
+            this.keyFactory = KeyFactory.getInstance("EC");
+        } catch (NoSuchAlgorithmException e) {
+            throw new KeyLoadingException(e);
+        }
     }
 
     /**
@@ -76,8 +77,8 @@ public class EcKeyLoader implements KeyLoader {
         try {
             // remove all unnecessary parts of the pem key text
             pemKeyText = pemKeyText
-                    .replaceAll("-----BEGIN EC PRIVATE KEY-----", "")
-                    .replaceAll("-----END EC PRIVATE KEY-----", "")
+                    .replaceAll("-----BEGIN (EC )?PRIVATE KEY-----", "")
+                    .replaceAll("-----END (EC )?PRIVATE KEY-----", "")
                     .replaceAll("\n", "");
             var decodedKeyString = Base64.getDecoder().decode(pemKeyText);
             var keySpec = new PKCS8EncodedKeySpec(decodedKeyString);
@@ -106,8 +107,8 @@ public class EcKeyLoader implements KeyLoader {
         try {
             // remove all unnecessary parts of the pem key text
             pemKeyText = pemKeyText
-                    .replaceAll("-----BEGIN EC PUBLIC KEY-----", "")
-                    .replaceAll("-----END EC PUBLIC KEY-----", "")
+                    .replaceAll("-----BEGIN (EC )?PUBLIC KEY-----", "")
+                    .replaceAll("-----END (EC )?PUBLIC KEY-----", "")
                     .replaceAll("\n", "");
             var keyBytes = Base64.getDecoder().decode(pemKeyText);
             var spec = new X509EncodedKeySpec(keyBytes);
@@ -115,7 +116,7 @@ public class EcKeyLoader implements KeyLoader {
             if (key instanceof ECPublicKey publicKey) {
                 return publicKey;
             } else {
-                throw new KeyLoadingException("Unable to load private key from pem-formatted key text.");
+                throw new KeyLoadingException("Unable to load public key from pem-formatted key text.");
             }
         } catch (InvalidKeySpecException e) {
             throw new KeyLoadingException("Key spec is invalid.", e);

key-pair-loader/src/test/java/com/onixbyte/security/KeyPairLoaderTest.java

@@ -17,13 +17,27 @@
 
 package com.onixbyte.security;
 
+import com.onixbyte.security.impl.EcKeyLoader;
 import org.junit.jupiter.api.Test;
 
 public class KeyPairLoaderTest {
 
     @Test
     public void test() {
-
+        var keyLoader = new EcKeyLoader();
+        var privateKey = keyLoader.loadPrivateKey("""
+                -----BEGIN PRIVATE KEY-----
+                MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQgs79JlARgXEf6EDV7
+                +PHQCTHEMtqIoHOy1GZ1+ynQJ6yhRANCAARkA7GRY2i4gg8qx0XViAXUP9cPw9pn
+                Jg1wfrQ41FaMyqVBejNYxvaLtamErF/ySimnjafMJ+VZCh34lBj6Ez8R
+                -----END PRIVATE KEY-----
+                """);
+        var publicKey = keyLoader.loadPublicKey("""
+                -----BEGIN PUBLIC KEY-----
+                MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEZAOxkWNouIIPKsdF1YgF1D/XD8Pa
+                ZyYNcH60ONRWjMqlQXozWMb2i7WphKxf8kopp42nzCflWQod+JQY+hM/EQ==
+                -----END PUBLIC KEY-----
+                """);
     }
 
 }

key-pair-loader/src/test/resources/ec_private_key.pem

@@ -0,0 +1,5 @@
+-----BEGIN PRIVATE KEY-----
+MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQgs79JlARgXEf6EDV7
++PHQCTHEMtqIoHOy1GZ1+ynQJ6yhRANCAARkA7GRY2i4gg8qx0XViAXUP9cPw9pn
+Jg1wfrQ41FaMyqVBejNYxvaLtamErF/ySimnjafMJ+VZCh34lBj6Ez8R
+-----END PRIVATE KEY-----

key-pair-loader/src/test/resources/ec_private_key_pkcs8.pem

@@ -0,0 +1,5 @@
+-----BEGIN PRIVATE KEY-----
+MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQgs79JlARgXEf6EDV7
++PHQCTHEMtqIoHOy1GZ1+ynQJ6yhRANCAARkA7GRY2i4gg8qx0XViAXUP9cPw9pn
+Jg1wfrQ41FaMyqVBejNYxvaLtamErF/ySimnjafMJ+VZCh34lBj6Ez8R
+-----END PRIVATE KEY-----

key-pair-loader/src/test/resources/ec_public_key.pem

@@ -0,0 +1,4 @@
+-----BEGIN PUBLIC KEY-----
+MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEZAOxkWNouIIPKsdF1YgF1D/XD8Pa
+ZyYNcH60ONRWjMqlQXozWMb2i7WphKxf8kopp42nzCflWQod+JQY+hM/EQ==
+-----END PUBLIC KEY-----