Initial code

.gitignore

@@ -1,3 +1,4 @@
+package-lock.json
 # Logs
 logs
 *.log

README.md

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-# OpenPGP-plugin
+# @isomorphic-git/openpgp-plugin
+
+OpenPGP.js plugin for isomorphic-git 1.x
+
+## 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
+
+## License
+
+In keeping with the OpenPGP.js license, this project is licensed under the
+GNU Lesser General Public License v3.0

index.js

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+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
+    }
+  }
+}

package.json

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+{
+  "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": ["isomorphic-git-plugin"],
+  "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"
+  }
+}