diff --git a/.gitignore b/.gitignore
index 00cbbdf..568aa46 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+package-lock.json
 # Logs
 logs
 *.log
diff --git a/README.md b/README.md
index 9c30cdd..6b6ab8a 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,18 @@
-# OpenPGP-plugin
\ No newline at end of file
+# @isomorphic-git/openpgp-plugin
+
+OpenPGP.js plugin for isomorphic-git
+
+## Usage
+
+```js
+const { GitOpenPGP } = require('@isomorphic-git/openpgp-plugin')
+const git = require('isomorphic-git')
+
+git.use(GitOpenPGP)
+
+// Now you can use git.sign() and git.verify()
+```
+
+## Tests
+
+TBD
\ No newline at end of file
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..ee68978
--- /dev/null
+++ b/index.js
@@ -0,0 +1,39 @@
+const openpgp = require('openpgp/dist/openpgp.min.js')
+
+module.exports.GitOpenPGP = {
+	name: 'GitOpenPGP',
+  signingHelper: {
+    async sign ({ payload, secretKey }) {
+      let { signature } = await openpgp.sign({
+        data: payload,
+        privateKeys: openpgp.key.readArmored(secretKey).keys,
+        detached: true,
+        armor: true
+      })
+      return signature
+    },
+    async verify ({ payload, signature, publicKey }) {
+      // let msg = openpgp.message.readSignedContent(payload, signature)
+			let {signatures} = await openpgp.verify({
+				message: openpgp.message.fromText(payload),
+				signature: openpgp.signature.readArmored(signature),
+				publicKeys: openpgp.key.readArmored(publicKey).keys
+			})
+			let invalid = []
+			let valid = []
+			for (let sig of signatures) {
+				if (sig.valid) {
+					valid.push(sig.keyid.toHex())
+				} else {
+					invalid.push(sig.keyid.toHex())
+				}
+			}
+			// We do this extra mashing to simplify client-side logic that
+			// is less interested in the values than the presence of values
+			let result = {}
+			if (valid.length > 0) result.valid = valid
+			if (invalid.length > 0) result.invalid = invalid
+      return result
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..f2923ed
--- /dev/null
+++ b/package.json
@@ -0,0 +1,23 @@
+{
+  "name": "@isomorphic-git/openpgp-plugin",
+  "version": "0.0.0-development",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 0"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/isomorphic-git/openpgp-plugin.git"
+  },
+  "keywords": [],
+  "author": "William Hilton <wmhilton@gmail.com>",
+  "license": "LGPL-3.0+",
+  "bugs": {
+    "url": "https://github.com/isomorphic-git/openpgp-plugin/issues"
+  },
+  "homepage": "https://github.com/isomorphic-git/openpgp-plugin#readme",
+  "dependencies": {
+    "openpgp": "3.0.4"
+  }
+}
diff --git a/renovate.json b/renovate.json
new file mode 100644
index 0000000..f45d8f1
--- /dev/null
+++ b/renovate.json
@@ -0,0 +1,5 @@
+{
+  "extends": [
+    "config:base"
+  ]
+}