diff --git a/types/check-sum/check-sum-tests.ts b/types/check-sum/check-sum-tests.ts
new file mode 100644
index 0000000000..e1f310e74d
--- /dev/null
+++ b/types/check-sum/check-sum-tests.ts
@@ -0,0 +1,18 @@
+import checksum = require('check-sum');
+import * as fs from 'fs';
+
+const stream = fs.createReadStream('package.json');
+
+checksum(stream, {
+    md5: 'asdfasdfasdf',
+    sha1: 'asdfasdfasdf'
+}, err => {
+    err; // $ExpectType any
+});
+
+checksum('package.json', {
+    md5: 'asdfasdfasdf',
+    sha1: 'asdfasdfasdf'
+}, err => {
+    err; // $ExpectType Error | ChecksumError | undefined
+});
diff --git a/types/check-sum/index.d.ts b/types/check-sum/index.d.ts
new file mode 100644
index 0000000000..d1e4b7eb02
--- /dev/null
+++ b/types/check-sum/index.d.ts
@@ -0,0 +1,24 @@
+// Type definitions for check-sum 0.1
+// Project: https://github.com/stream-utils/check-sum
+// Definitions by: BendingBender <https://github.com/BendingBender>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference types="node" />
+import { Readable } from 'stream';
+
+export = checksum;
+
+declare function checksum(stream: Readable, hashes: checksum.Hashes, callback: (error: checksum.ChecksumError | any) => void): (fn: () => void) => void;
+declare function checksum(path: string, hashes: checksum.Hashes, callback: (error: checksum.ChecksumError | Error | undefined) => void): (fn: () => void) => void;
+
+declare namespace checksum {
+    interface ChecksumError {
+        algorithm: string;
+        expected: string;
+        actual: string;
+    }
+
+    interface Hashes {
+        [algorithm: string]: string | Buffer;
+    }
+}
diff --git a/types/check-sum/tsconfig.json b/types/check-sum/tsconfig.json
new file mode 100644
index 0000000000..2143ca3bd6
--- /dev/null
+++ b/types/check-sum/tsconfig.json
@@ -0,0 +1,22 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "check-sum-tests.ts"
+    ]
+}
diff --git a/types/check-sum/tslint.json b/types/check-sum/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/check-sum/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }