Separate encryption/decryption logic for different frameworks used

passKit/Crypto/GopenPgp.swift

@@ -0,0 +1,57 @@
+//
+//  GopenPgp.swift
+//  passKit
+//
+//  Created by Danny Moesch on 08.09.19.
+//  Copyright © 2019 Bob Sun. All rights reserved.
+//
+
+import Crypto
+
+struct GopenPgp: PgpInterface {
+
+    private let publicKey: CryptoKeyRing
+    private let privateKey: CryptoKeyRing
+
+    init(publicArmoredKey: String, privateArmoredKey: String) throws {
+        guard let pgp = CryptoGetGopenPGP() else {
+            throw AppError.KeyImport
+        }
+        publicKey = try pgp.buildKeyRingArmored(publicArmoredKey)
+        privateKey = try pgp.buildKeyRingArmored(privateArmoredKey)
+    }
+
+    func decrypt(encryptedData: Data, passphrase: String) throws -> Data? {
+        try privateKey.unlock(withPassphrase: passphrase)
+        let message = createPgpMessage(from: encryptedData)
+        return try privateKey.decrypt(message, verifyKey: nil, verifyTime: 0).data
+    }
+
+    func encrypt(plainData: Data) throws -> Data {
+        let encryptedData = try publicKey.encrypt(CryptoNewPlainMessage(plainData.mutable as Data), privateKey: nil)
+        if SharedDefaults[.encryptInArmored] {
+            var error: NSError?
+            let armor = encryptedData.getArmored(&error)
+            guard error == nil else {
+                throw error!
+            }
+            return armor.data(using: .ascii)!
+        }
+        return encryptedData.getBinary()!
+    }
+
+    var keyId: String {
+        var error: NSError?
+        let fingerprint = publicKey.getFingerprint(&error)
+        return error == nil ? String(fingerprint.suffix(8)).uppercased() : ""
+    }
+
+    private func createPgpMessage(from encryptedData: Data) -> CryptoPGPMessage? {
+        if SharedDefaults[.encryptInArmored] {
+            var error: NSError?
+            let message = CryptoNewPGPMessageFromArmored(String(data: encryptedData, encoding: .ascii), &error)
+            return error == nil ? message : nil
+        }
+        return CryptoNewPGPMessage(encryptedData.mutable as Data)
+    }
+}