Add unit tests for current behavior

Author: paragonie-security

tests/Keys/JWTKeyTest.php

@@ -0,0 +1,87 @@
+<?php
+namespace Firebase\JWT\Keys;
+
+use PHPUnit\Framework\TestCase;
+
+class JWTKeyTest extends TestCase
+{
+    public function testExpectedAlgGuess()
+    {
+        $eddsa = 'MpwwPe63YoDwAoO7EDBUOUb7J9lpdjt8vT+hfnLL39k=';
+        $ecc384 = $this->getEcdsaPublicKey();
+        $rsa = $this->getRsaPublicKey();
+        $misc = 'maybe_use_paseto_instead';
+
+        $this->assertSame(
+            'RS512',
+            JWTKey::guessAlgFromKeyMaterial($rsa, array('RS512'))
+        );
+        $this->assertSame(
+            'RS384',
+            JWTKey::guessAlgFromKeyMaterial($rsa, array('RS384'))
+        );
+        $this->assertSame(
+            'RS256',
+            JWTKey::guessAlgFromKeyMaterial($rsa, array('RS256'))
+        );
+        $this->assertSame(
+            'RS256',
+            JWTKey::guessAlgFromKeyMaterial($rsa)
+        );
+        $this->assertSame(
+            'ES384',
+            JWTKey::guessAlgFromKeyMaterial($ecc384, array('ES384'))
+        );
+        $this->assertSame(
+            'ES256',
+            JWTKey::guessAlgFromKeyMaterial($ecc384)
+        );
+        $this->assertSame(
+            'EdDSA',
+            JWTKey::guessAlgFromKeyMaterial($eddsa, array('EdDSA'))
+        );
+        $this->assertSame(
+            'HS256',
+            JWTKey::guessAlgFromKeyMaterial($eddsa)
+        );
+        $this->assertSame(
+            'HS384',
+            JWTKey::guessAlgFromKeyMaterial($misc, array('HS512'))
+        );
+        $this->assertSame(
+            'HS384',
+            JWTKey::guessAlgFromKeyMaterial($misc, array('HS384'))
+        );
+        $this->assertSame(
+            'HS256',
+            JWTKey::guessAlgFromKeyMaterial($misc, array('HS256'))
+        );
+        $this->assertSame(
+            'HS256',
+            JWTKey::guessAlgFromKeyMaterial($misc)
+        );
+    }
+
+    public function getRsaPublicKey()
+    {
+        $privKey = openssl_pkey_new(array('digest_alg' => 'sha256',
+            'private_key_bits' => 1024,
+            'private_key_type' => OPENSSL_KEYTYPE_RSA));
+        $pubKey = openssl_pkey_get_details($privKey);
+        return $pubKey['key'];
+    }
+
+    public function getEcdsaPublicKey()
+    {
+        $privKey = openssl_pkey_new(
+            array(
+                'curve_name' => 'secp384r1',
+                'digest_alg' => 'sha384',
+                'private_key_bits' => 384,
+                'private_key_type' => OPENSSL_KEYTYPE_EC
+            )
+        );
+        $pubKey = openssl_pkey_get_details($privKey);
+        return $pubKey['key'];
+    }
+}