Add Client encrypted and some demo,phpunit test

samples/Common.php

@@ -8,8 +8,12 @@
 }
 require_once __DIR__ . '/Config.php';
 
+use OSS\Crypto\BaseCryptoProvider;
 use OSS\OssClient;
+use Oss\OssEncryptionClient;
 use OSS\Core\OssException;
+use OSS\Crypto\RsaProvider;
+use Oss\Crypto\KmsProvider;
 
 /**
  * Class Common
@@ -39,6 +43,26 @@ public static function getOssClient()
         }
         return $ossClient;
     }
+
+
+	/**
+	 * @param KmsProvider|RsaProvider $provider
+	 * @return OssEncryptionClient|null
+	 */
+	public static function getOssEncryptionClient($provider)
+	{
+		if (!$provider instanceof BaseCryptoProvider){
+			throw new OssException('Crypto provider must be an instance of BaseCryptoProvider');
+		}
+		try {
+			$ossClient = new OssEncryptionClient(self::accessKeyId, self::accessKeySecret, self::endpoint, $provider);
+		} catch (OssException $e) {
+			printf(__FUNCTION__ . "creating OssClient instance: FAILED\n");
+			printf($e->getMessage() . "\n");
+			return null;
+		}
+		return $ossClient;
+	}
 
     public static function getBucketName()
     {

samples/Config.php

@@ -12,4 +12,7 @@ final class Config
     const OSS_ACCESS_KEY = 'update me';
     const OSS_ENDPOINT = 'update me';
     const OSS_TEST_BUCKET = 'update me';
+    const KMS_ENDPOINT_OTHER = 'update me';
+    const KMS_ENDPOINT = 'update me';
+
 }