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Pods/SwiftyRSA/Source/Key.swift

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+//
+//  Key.swift
+//  SwiftyRSA
+//
+//  Created by Loïs Di Qual on 9/19/16.
+//  Copyright © 2016 Scoop. All rights reserved.
+//
+
+import Foundation
+import Security
+
+public protocol Key: AnyObject {
+    
+    var reference: SecKey { get }
+    var originalData: Data? { get }
+    
+    init(data: Data) throws
+    init(reference: SecKey) throws
+    init(base64Encoded base64String: String) throws
+    init(pemEncoded pemString: String) throws
+    init(pemNamed pemName: String, in bundle: Bundle) throws
+    init(derNamed derName: String, in bundle: Bundle) throws
+    
+    func pemString() throws -> String
+    func data() throws -> Data
+    func base64String() throws -> String
+}
+
+public extension Key {
+    
+    /// Returns a Base64 representation of the public key.
+    ///
+    /// - Returns: Data of the key, Base64-encoded
+    /// - Throws: SwiftyRSAError
+    func base64String() throws -> String {
+        return try data().base64EncodedString()
+    }
+    
+    func data() throws -> Data {
+        return try SwiftyRSA.data(forKeyReference: reference)
+    }
+    
+    /// Creates a public key with a base64-encoded string.
+    ///
+    /// - Parameter base64String: Base64-encoded public key data
+    /// - Throws: SwiftyRSAError
+    init(base64Encoded base64String: String) throws {
+        guard let data = Data(base64Encoded: base64String, options: [.ignoreUnknownCharacters]) else {
+            throw SwiftyRSAError.invalidBase64String
+        }
+        try self.init(data: data)
+    }
+    
+    /// Creates a public key with a PEM string.
+    ///
+    /// - Parameter pemString: PEM-encoded public key string
+    /// - Throws: SwiftyRSAError
+    init(pemEncoded pemString: String) throws {
+        let base64String = try SwiftyRSA.base64String(pemEncoded: pemString)
+        try self.init(base64Encoded: base64String)
+    }
+    
+    /// Creates a public key with a PEM file.
+    ///
+    /// - Parameters:
+    ///   - pemName: Name of the PEM file
+    ///   - bundle: Bundle in which to look for the PEM file. Defaults to the main bundle.
+    /// - Throws: SwiftyRSAError
+    init(pemNamed pemName: String, in bundle: Bundle = Bundle.main) throws {
+        guard let path = bundle.path(forResource: pemName, ofType: "pem") else {
+            throw SwiftyRSAError.pemFileNotFound(name: pemName)
+        }
+        let keyString = try String(contentsOf: URL(fileURLWithPath: path), encoding: .utf8)
+        try self.init(pemEncoded: keyString)
+    }
+    
+    /// Creates a private key with a DER file.
+    ///
+    /// - Parameters:
+    ///   - derName: Name of the DER file
+    ///   - bundle: Bundle in which to look for the DER file. Defaults to the main bundle.
+    /// - Throws: SwiftyRSAError
+    init(derNamed derName: String, in bundle: Bundle = Bundle.main) throws {
+        guard let path = bundle.path(forResource: derName, ofType: "der") else {
+            throw SwiftyRSAError.derFileNotFound(name: derName)
+        }
+        let data = try Data(contentsOf: URL(fileURLWithPath: path))
+        try self.init(data: data)
+    }
+}