feat: add test key builder from cli (planning#667))

tools/src/main/java/dev/fitko/fitconnect/tools/jwk/TestKeys.java

+package dev.fitko.fitconnect.tools.jwk;
+
+import com.nimbusds.jose.JWEAlgorithm;
+import com.nimbusds.jose.JWSAlgorithm;
+import com.nimbusds.jose.jwk.JWK;
+import dev.fitko.fitconnect.api.domain.crypto.JWKPair;
+import dev.fitko.fitconnect.core.crypto.utils.KeyGenerator;
+
+import java.security.KeyPair;
+import java.util.UUID;
+
+import static com.nimbusds.jose.jwk.KeyOperation.SIGN;
+import static com.nimbusds.jose.jwk.KeyOperation.UNWRAP_KEY;
+import static com.nimbusds.jose.jwk.KeyOperation.VERIFY;
+import static com.nimbusds.jose.jwk.KeyOperation.WRAP_KEY;
+
+/**
+ * JWK Test Key Generator.
+ * <p>
+ * Generates key pairs of public and private keys for encryption and signing.
+ */
+public final class TestKeys {
+
+    public static final int DEFAULT_KEY_SIZE = 4096;
+
+
+    private TestKeys() {
+    }
+
+    /**
+     * Generate a set of public encryption key and private decryption key.
+     *
+     * @param keySize size of the RSA key in bits
+     * @return JWKPair of public and private key
+     */
+    public static JWKPair generateEncryptionKeyPair(final int keySize) {
+
+        final String keyId = UUID.randomUUID().toString();
+        final JWEAlgorithm encryptionAlgorithm = JWEAlgorithm.RSA_OAEP_256;
+
+        final KeyPair keyPair = KeyGenerator.buildRSAKeyPair(keySize);
+
+        final JWK publicEncryptionKey = KeyGenerator.buildJWK(keyPair, keyId, WRAP_KEY, encryptionAlgorithm);
+        final JWK privateDecryptionKey = KeyGenerator.buildJWK(keyPair, keyId, UNWRAP_KEY, encryptionAlgorithm);
+
+        return new JWKPair(publicEncryptionKey.toPublicJWK(), privateDecryptionKey);
+    }
+
+    /**
+     * Generate a set of public signature verification key and private signature key.
+     *
+     * @param keySize size of the RSA key in bits
+     * @return JWKPair of signature and verification key
+     */
+    public static JWKPair generateSignatureKeyPair(final int keySize) {
+
+        final String keyId = UUID.randomUUID().toString();
+        final JWSAlgorithm signingAlgorithm = JWSAlgorithm.PS512;
+
+        final KeyPair keyPair = KeyGenerator.buildRSAKeyPair(keySize);
+
+        final JWK publicSignatureVerificationKey = KeyGenerator.buildJWK(keyPair, keyId, VERIFY, signingAlgorithm);
+        final JWK privateSignatureKey = KeyGenerator.buildJWK(keyPair, keyId, SIGN, signingAlgorithm);
+
+        return new JWKPair(publicSignatureVerificationKey.toPublicJWK(), privateSignatureKey);
+    }
+}