diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..15fa182
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+/.idea/
+/tests/
+/var/
+/vendor/
+
+phpunit.xml
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..2323907
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,21 @@
+language: php
+
+php:
+  - 7.0
+  - 7.1
+  - nightly
+
+install:
+  - composer self-update
+  - composer install
+
+script:
+  - vendor/bin/phpunit --coverage-clover=coverage.xml
+
+after_success:
+#   Coverage reporting
+  - bash <(curl -s https://codecov.io/bash)
+
+cache:
+  directories:
+    - $HOME/.composer/cache
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..fef1309
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,9 @@
+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## [0.1.0] - 2017-08-18
+### Added
+- Filrebase decoder
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..523e371
--- /dev/null
+++ b/README.md
@@ -0,0 +1,6 @@
+# Library-Agnostic Adapters and Utils for JSON Web Token
+ 
+## Install 
+```bash
+composer install
+```
\ No newline at end of file
diff --git a/composer.json b/composer.json
new file mode 100644
index 0000000..dbb673f
--- /dev/null
+++ b/composer.json
@@ -0,0 +1,26 @@
+{
+    "name": "free-elephants/jwt",
+    "type": "project",
+    "require": {
+        "firebase/php-jwt": "^5.0"
+    },
+    "authors": [
+        {
+            "name": "samizdam",
+            "email": "samizdam@inbox.ru"
+        }
+    ],
+    "autoload": {
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+        }
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+        }
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+    }
+}
diff --git a/composer.lock b/composer.lock
new file mode 100644
index 0000000..b396adf
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,1514 @@
+{
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+    ],
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+                }
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+            "time": "2017-08-03T12:35:26+00:00"
+        },
+        {
+            "name": "sebastian/object-reflector",
+            "version": "1.1.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-reflector.git",
+                "reference": "773f97c67f28de00d397be301821b06708fca0be"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/773f97c67f28de00d397be301821b06708fca0be",
+                "reference": "773f97c67f28de00d397be301821b06708fca0be",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.1-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Allows reflection of object attributes, including inherited and non-public ones",
+            "homepage": "https://github.com/sebastianbergmann/object-reflector/",
+            "time": "2017-03-29T09:07:27+00:00"
+        },
+        {
+            "name": "sebastian/recursion-context",
+            "version": "3.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/recursion-context.git",
+                "reference": "5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8",
+                "reference": "5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                }
+            ],
+            "description": "Provides functionality to recursively process PHP variables",
+            "homepage": "http://www.github.com/sebastianbergmann/recursion-context",
+            "time": "2017-03-03T06:23:57+00:00"
+        },
+        {
+            "name": "sebastian/resource-operations",
+            "version": "1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/resource-operations.git",
+                "reference": "ce990bb21759f94aeafd30209e8cfcdfa8bc3f52"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/resource-operations/zipball/ce990bb21759f94aeafd30209e8cfcdfa8bc3f52",
+                "reference": "ce990bb21759f94aeafd30209e8cfcdfa8bc3f52",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Provides a list of PHP built-in functions that operate on resources",
+            "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
+            "time": "2015-07-28T20:34:47+00:00"
+        },
+        {
+            "name": "sebastian/version",
+            "version": "2.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/99732be0ddb3361e16ad77b68ba41efc8e979019",
+                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.6"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library that helps with managing the version number of Git-hosted PHP projects",
+            "homepage": "https://github.com/sebastianbergmann/version",
+            "time": "2016-10-03T07:35:21+00:00"
+        },
+        {
+            "name": "theseer/tokenizer",
+            "version": "1.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theseer/tokenizer.git",
+                "reference": "cb2f008f3f05af2893a87208fe6a6c4985483f8b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/cb2f008f3f05af2893a87208fe6a6c4985483f8b",
+                "reference": "cb2f008f3f05af2893a87208fe6a6c4985483f8b",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": "^7.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "time": "2017-04-07T12:08:54+00:00"
+        },
+        {
+            "name": "webmozart/assert",
+            "version": "1.2.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/webmozart/assert.git",
+                "reference": "2db61e59ff05fe5126d152bd0655c9ea113e550f"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/2db61e59ff05fe5126d152bd0655c9ea113e550f",
+                "reference": "2db61e59ff05fe5126d152bd0655c9ea113e550f",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.3 || ^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.6",
+                "sebastian/version": "^1.0.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.3-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Webmozart\\Assert\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@gmail.com"
+                }
+            ],
+            "description": "Assertions to validate method input/output with nice error messages.",
+            "keywords": [
+                "assert",
+                "check",
+                "validate"
+            ],
+            "time": "2016-11-23T20:04:58+00:00"
+        }
+    ],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": [],
+    "platform-dev": []
+}
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
new file mode 100644
index 0000000..02ca38c
--- /dev/null
+++ b/phpunit.xml.dist
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.3/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
+>
+    <testsuites>
+        <testsuite name="Test Suite">
+            <directory>tests/</directory>
+        </testsuite>
+    </testsuites>
+
+    <filter>
+        <whitelist processUncoveredFilesFromWhitelist="true">
+            <directory suffix=".php">src/</directory>
+        </whitelist>
+    </filter>
+
+    <logging>
+        <!--<log type="coverage-html" target="tests/_coverage" lowUpperBound="25" highLowerBound="75"/>-->
+        <log type="coverage-text" target="php://stdout" showOnlySummary="true"/>
+    </logging>
+</phpunit>
\ No newline at end of file
diff --git a/src/FreeElephants/Jwt/AbstractJwtDecoderFactory.php b/src/FreeElephants/Jwt/AbstractJwtDecoderFactory.php
new file mode 100644
index 0000000..f3307be
--- /dev/null
+++ b/src/FreeElephants/Jwt/AbstractJwtDecoderFactory.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace FreeElephants\Jwt;
+
+abstract class AbstractJwtDecoderFactory
+{
+
+    abstract public function createJwtDecoderAdapter(string $key, array $allowedAlgorithms): JwtDecoderAdapterInterface;
+}
\ No newline at end of file
diff --git a/src/FreeElephants/Jwt/Exception/InvalidArgumentException.php b/src/FreeElephants/Jwt/Exception/InvalidArgumentException.php
new file mode 100644
index 0000000..8b61e30
--- /dev/null
+++ b/src/FreeElephants/Jwt/Exception/InvalidArgumentException.php
@@ -0,0 +1,10 @@
+<?php
+
+
+namespace FreeElephants\Jwt\Exception;
+
+
+class InvalidArgumentException extends \InvalidArgumentException implements JwtExceptionInterface
+{
+
+}
\ No newline at end of file
diff --git a/src/FreeElephants/Jwt/Exception/JwtExceptionInterface.php b/src/FreeElephants/Jwt/Exception/JwtExceptionInterface.php
new file mode 100644
index 0000000..360b69e
--- /dev/null
+++ b/src/FreeElephants/Jwt/Exception/JwtExceptionInterface.php
@@ -0,0 +1,10 @@
+<?php
+
+
+namespace FreeElephants\Jwt\Exception;
+
+
+interface JwtExceptionInterface
+{
+
+}
\ No newline at end of file
diff --git a/src/FreeElephants/Jwt/Exception/OutOfBoundsException.php b/src/FreeElephants/Jwt/Exception/OutOfBoundsException.php
new file mode 100644
index 0000000..4e5cb57
--- /dev/null
+++ b/src/FreeElephants/Jwt/Exception/OutOfBoundsException.php
@@ -0,0 +1,10 @@
+<?php
+
+
+namespace FreeElephants\Jwt\Exception;
+
+
+class OutOfBoundsException extends \OutOfBoundsException implements JwtExceptionInterface
+{
+
+}
\ No newline at end of file
diff --git a/src/FreeElephants/Jwt/FirebaseJwtDecoderAdapter.php b/src/FreeElephants/Jwt/FirebaseJwtDecoderAdapter.php
new file mode 100644
index 0000000..94901a8
--- /dev/null
+++ b/src/FreeElephants/Jwt/FirebaseJwtDecoderAdapter.php
@@ -0,0 +1,58 @@
+<?php
+
+
+namespace FreeElephants\Jwt;
+
+
+use Firebase\JWT\JWT;
+use FreeElephants\Jwt\Exception\InvalidArgumentException;
+use FreeElephants\Jwt\Exception\OutOfBoundsException;
+
+class FirebaseJwtDecoderAdapter implements JwtDecoderAdapterInterface
+{
+
+    private $algorithms;
+    /**
+     * @var string
+     */
+    private $key;
+
+    public function __construct(string $key, array $algorithms)
+    {
+        $this->key = $key;
+        $this->setAlgorithms($algorithms);
+    }
+
+    public function getAlgorithms(): array
+    {
+        return $this->algorithms;
+    }
+
+    public function setAlgorithms(array $algorithms)
+    {
+        if (empty($algorithms)) {
+            throw new InvalidArgumentException('JWT algorithms list can not be empty');
+        }
+
+        if ($outOfSupported = array_diff($algorithms, $this->getSupportedAlgorithms())) {
+            throw new OutOfBoundsException('Some algorithms out of supported in this adapter: ' . implode($outOfSupported));
+        }
+
+        $this->algorithms = $algorithms;
+    }
+
+    public function decode(string $signature): \stdClass
+    {
+        return JWT::decode($signature, $this->key, $this->algorithms);
+    }
+
+    public function getSupportedAlgorithms(): array
+    {
+        return [
+            'HS256',
+            'HS384',
+            'HS512',
+            'RS256'
+        ];
+    }
+}
\ No newline at end of file
diff --git a/src/FreeElephants/Jwt/FirebaseJwtDecoderFactory.php b/src/FreeElephants/Jwt/FirebaseJwtDecoderFactory.php
new file mode 100644
index 0000000..e793547
--- /dev/null
+++ b/src/FreeElephants/Jwt/FirebaseJwtDecoderFactory.php
@@ -0,0 +1,14 @@
+<?php
+
+
+namespace FreeElephants\Jwt;
+
+
+class FirebaseJwtDecoderFactory extends AbstractJwtDecoderFactory
+{
+
+    public function createJwtDecoderAdapter(string $key, array $allowedAlgorithms): JwtDecoderAdapterInterface
+    {
+        return new FirebaseJwtDecoderAdapter($key, $allowedAlgorithms);
+    }
+}
\ No newline at end of file
diff --git a/src/FreeElephants/Jwt/JwtDecoderAdapterInterface.php b/src/FreeElephants/Jwt/JwtDecoderAdapterInterface.php
new file mode 100644
index 0000000..383b88a
--- /dev/null
+++ b/src/FreeElephants/Jwt/JwtDecoderAdapterInterface.php
@@ -0,0 +1,17 @@
+<?php
+
+
+namespace FreeElephants\Jwt;
+
+
+interface JwtDecoderAdapterInterface
+{
+
+    public function getAlgorithms(): array;
+
+    public function setAlgorithms(array $algorithms);
+
+    public function decode(string $signature): \stdClass;
+
+    public function getSupportedAlgorithms(): array;
+}
\ No newline at end of file
diff --git a/src/FreeElephants/Jwt/JwtValidatorInterface.php b/src/FreeElephants/Jwt/JwtValidatorInterface.php
new file mode 100644
index 0000000..ece7414
--- /dev/null
+++ b/src/FreeElephants/Jwt/JwtValidatorInterface.php
@@ -0,0 +1,12 @@
+<?php
+
+namespace FreeElephants\Jwt;
+
+/**
+ * @author samizdam <samizdam@inbox.ru>
+ */
+interface JwtValidatorInterface
+{
+
+    public function isValid(string $signature): bool;
+}
\ No newline at end of file