Move Crypto functionality back to passKit

passKit/Crypto/ObjectivePGPInterface.swift

@@ -0,0 +1,59 @@
+//
+//  ObjectivePGPInterface.swift
+//  passKit
+//
+//  Created by Danny Moesch on 08.09.19.
+//  Copyright © 2019 Bob Sun. All rights reserved.
+//
+
+import ObjectivePGP
+
+struct ObjectivePGPInterface: PGPInterface {
+    private let publicKey: Key
+    private let privateKey: Key
+
+    private let keyring = ObjectivePGP.defaultKeyring
+
+    init(publicArmoredKey: String, privateArmoredKey: String) throws {
+        guard let publicKeyData = publicArmoredKey.data(using: .ascii), let privateKeyData = privateArmoredKey.data(using: .ascii) else {
+            throw AppError.KeyImport
+        }
+        let publicKeys = try ObjectivePGP.readKeys(from: publicKeyData)
+        let privateKeys = try ObjectivePGP.readKeys(from: privateKeyData)
+        keyring.import(keys: publicKeys)
+        keyring.import(keys: privateKeys)
+        guard let publicKey = publicKeys.first, let privateKey = privateKeys.first else {
+            throw AppError.KeyImport
+        }
+        self.publicKey = publicKey
+        self.privateKey = privateKey
+    }
+
+    func decrypt(encryptedData: Data, keyID _: String, passphrase: String) throws -> Data? {
+        try ObjectivePGP.decrypt(encryptedData, andVerifySignature: false, using: keyring.keys) { _ in passphrase }
+    }
+
+    func encrypt(plainData: Data, keyID _: String) throws -> Data {
+        let encryptedData = try ObjectivePGP.encrypt(plainData, addSignature: false, using: keyring.keys, passphraseForKey: nil)
+        if Defaults.encryptInArmored {
+            return Armor.armored(encryptedData, as: .message).data(using: .ascii)!
+        }
+        return encryptedData
+    }
+
+    func containsPublicKey(with keyID: String) -> Bool {
+        keyring.findKey(keyID)?.isPublic ?? false
+    }
+
+    func containsPrivateKey(with keyID: String) -> Bool {
+        keyring.findKey(keyID)?.isSecret ?? false
+    }
+
+    var keyID: [String] {
+        keyring.keys.map(\.keyID.longIdentifier)
+    }
+
+    var shortKeyID: [String] {
+        keyring.keys.map(\.keyID.shortIdentifier)
+    }
+}