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Pods/SwiftyRSA/Source/PrivateKey.swift

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+//
+//  PrivateKey.swift
+//  SwiftyRSA
+//
+//  Created by Lois Di Qual on 5/17/17.
+//  Copyright © 2017 Scoop. All rights reserved.
+//
+
+import Foundation
+
+public class PrivateKey: Key {
+    
+    /// Reference to the key within the keychain
+    public let reference: SecKey
+    
+    /// Original data of the private key.
+    /// Note that it does not contain PEM headers and holds data as bytes, not as a base 64 string.
+    public let originalData: Data?
+    
+    let tag: String?
+    
+    /// Returns a PEM representation of the private key.
+    ///
+    /// - Returns: Data of the key, PEM-encoded
+    /// - Throws: SwiftyRSAError
+    public func pemString() throws -> String {
+        let data = try self.data()
+        let pem = SwiftyRSA.format(keyData: data, withPemType: "RSA PRIVATE KEY")
+        return pem
+    }
+    
+    /// Creates a private key with a keychain key reference.
+    /// This initializer will throw if the provided key reference is not a private RSA key.
+    ///
+    /// - Parameter reference: Reference to the key within the keychain.
+    /// - Throws: SwiftyRSAError
+    public required init(reference: SecKey) throws {
+        
+        guard SwiftyRSA.isValidKeyReference(reference, forClass: kSecAttrKeyClassPrivate) else {
+            throw SwiftyRSAError.notAPrivateKey
+        }
+        
+        self.reference = reference
+        self.tag = nil
+        self.originalData = nil
+    }
+    
+    /// Creates a private key with a RSA public key data.
+    ///
+    /// - Parameter data: Private key data
+    /// - Throws: SwiftyRSAError
+    required public init(data: Data) throws {
+        self.originalData = data
+        let tag = UUID().uuidString
+        self.tag = tag
+        let dataWithoutHeader = try SwiftyRSA.stripKeyHeader(keyData: data)
+        reference = try SwiftyRSA.addKey(dataWithoutHeader, isPublic: false, tag: tag)
+    }
+    
+    deinit {
+        if let tag = tag {
+            SwiftyRSA.removeKey(tag: tag)
+        }
+    }
+}