首次放到 git

utils/sha2.js

@@ -0,0 +1,23 @@
+'use strict';
+
+var hash = require('hash.js');
+
+var convert = require('./convert.js');
+
+function sha256(data) {
+    data = convert.arrayify(data);
+    return '0x' + (hash.sha256().update(data).digest('hex'));
+}
+
+function sha512(data) {
+    data = convert.arrayify(data);
+    return '0x' + (hash.sha512().update(data).digest('hex'));
+}
+
+module.exports = {
+    sha256: sha256,
+    sha512: sha512,
+
+    createSha256: hash.sha256,
+    createSha512: hash.sha512,
+}