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Pods/SwiftyRSA/Source/EncryptedMessage.swift

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+//
+//  EncryptedMessage.swift
+//  SwiftyRSA
+//
+//  Created by Lois Di Qual on 5/18/17.
+//  Copyright © 2017 Scoop. All rights reserved.
+//
+
+import Foundation
+
+public class EncryptedMessage: Message {
+    
+    /// Data of the message
+    public let data: Data
+    
+    /// Creates an encrypted message with data.
+    ///
+    /// - Parameter data: Data of the encrypted message.
+    public required init(data: Data) {
+        self.data = data
+    }
+    
+    /// Decrypts an encrypted message with a private key and returns a clear message.
+    ///
+    /// - Parameters:
+    ///   - key: Private key to decrypt the mssage with
+    ///   - padding: Padding to use during the decryption
+    /// - Returns: Clear message
+    /// - Throws: SwiftyRSAError
+    public func decrypted(with key: PrivateKey, padding: Padding) throws -> ClearMessage {
+        let blockSize = SecKeyGetBlockSize(key.reference)
+        
+        var encryptedDataAsArray = [UInt8](repeating: 0, count: data.count)
+        (data as NSData).getBytes(&encryptedDataAsArray, length: data.count)
+        
+        var decryptedDataBytes = [UInt8](repeating: 0, count: 0)
+        var idx = 0
+        while idx < encryptedDataAsArray.count {
+            
+            let idxEnd = min(idx + blockSize, encryptedDataAsArray.count)
+            let chunkData = [UInt8](encryptedDataAsArray[idx..<idxEnd])
+            
+            var decryptedDataBuffer = [UInt8](repeating: 0, count: blockSize)
+            var decryptedDataLength = blockSize
+            
+            let status = SecKeyDecrypt(key.reference, padding, chunkData, idxEnd-idx, &decryptedDataBuffer, &decryptedDataLength)
+            guard status == noErr else {
+                throw SwiftyRSAError.chunkDecryptFailed(index: idx)
+            }
+            
+            decryptedDataBytes += [UInt8](decryptedDataBuffer[0..<decryptedDataLength])
+            
+            idx += blockSize
+        }
+        
+        let decryptedData = Data(bytes: decryptedDataBytes, count: decryptedDataBytes.count)
+        return ClearMessage(data: decryptedData)
+    }
+}