from: github.com/remko/age-plugin-se

Sources/Base64.swift

@@ -0,0 +1,36 @@
+import Foundation
+
+extension Data {
+  init?(base64RawEncoded: String) {
+    if base64RawEncoded.hasSuffix("=") {
+      return nil
+    }
+    var str = base64RawEncoded
+    switch base64RawEncoded.count % 4 {
+    case 2:
+      str += "=="
+    case 3:
+      str += "="
+    default:
+      ()
+    }
+    guard let data = Data(base64Encoded: str) else {
+      return nil
+    }
+    self = data
+  }
+
+  var base64RawEncodedData: Data {
+    var s = base64EncodedData(options: [
+      Base64EncodingOptions.lineLength64Characters, Base64EncodingOptions.endLineWithLineFeed,
+    ])
+    if let pi = s.firstIndex(of: Character("=").asciiValue!) {
+      s = Data(s[s.startIndex..<pi])
+    }
+    return s
+  }
+
+  var base64RawEncodedString: String {
+    return String(data: base64RawEncodedData, encoding: .utf8)!
+  }
+}