add createFingerprint interface

index.js

@@ -3,6 +3,7 @@ import crypto from 'crypto';
 module.exports = {
     encryptLogin: _encryptLogin,
     renderPassword: _renderPassword,
+    createFingerprint: createFingerprint,
     _deriveEncryptedLogin,
     _getPasswordTemplate,
     _prettyPrint,
@@ -102,3 +103,9 @@ function _getPasswordChar(charType, index) {
     const passwordChar = passwordsChars[charType];
     return passwordChar[index % passwordChar.length];
 }
+
+function createFingerprint(str) {
+    return new Promise(resolve => {
+        resolve(crypto.createHmac('sha256', str).digest('hex'))
+    });
+}

tests/api.tests.js

@@ -242,3 +242,10 @@ test('auto generated render password tests', t => {
     });
 });
 
+
+test('createFingerprint', t => {
+    return lesspass.createFingerprint('password').then(fingerprint => {
+        t.is('e56a207acd1e6714735487c199c6f095844b7cc8e5971d86c003a7b6f36ef51e', fingerprint);
+    });
+});
+