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Add swift key size support

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This commit is contained in:
Hugo Pointcheval 2020-04-15 23:31:52 +02:00
parent c79c4e5097
commit 6cbe00a609
1 changed files with 14 additions and 7 deletions
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19
ios/Classes/SwiftNativeCryptoPlugin.swift
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@ -1,7 +1,6 @@
import Flutter
import UIKit
import CryptoKit
import Foundation
import CommonCrypto
extension FlutterStandardTypedData {
@ -99,8 +98,10 @@ public class SwiftNativeCryptoPlugin: NSObject, FlutterPlugin {
public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
switch call.method {
case "symKeygen":
let args = call.arguments as! NSDictionary
let keySize = args["size"] as! NSNumber
let keyBytes = symKeygen()
let keyBytes = symKeygen(keySize: keySize)!
result(FlutterStandardTypedData.init(bytes: keyBytes))
@ -108,6 +109,7 @@ public class SwiftNativeCryptoPlugin: NSObject, FlutterPlugin {
let args = call.arguments as! NSDictionary
let payload = (args["payload"] as! FlutterStandardTypedData).data
let aesKey = (args["aesKey"] as! FlutterStandardTypedData).data
let encryptedPayloadIV = symEncrypt(payload: payload, aesKey: aesKey)
result(encryptedPayloadIV)
@ -121,6 +123,7 @@ public class SwiftNativeCryptoPlugin: NSObject, FlutterPlugin {
let encryptedPayload = [encrypted, iv]
let aesKey = (args["aesKey"] as! FlutterStandardTypedData).data
let decryptedPayload = symDecrypt(payload: encryptedPayload, aesKey: aesKey)!
result(decryptedPayload)
@ -135,11 +138,16 @@ public class SwiftNativeCryptoPlugin: NSObject, FlutterPlugin {
return hashed.data
}
func symKeygen() -> Data {
let key = SymmetricKey(size: .bits256)
let keyBytes = key.withUnsafeBytes {return Data(Array($0))}
func symKeygen(keySize : NSNumber) -> Data? {
var bytes = [Int8](repeating: 0, count: keySize.intValue / 8)
let status = SecRandomCopyBytes(kSecRandomDefault, bytes.count, &bytes)
if status == errSecSuccess { // Always test the status.
let keyBytes = bytes.withUnsafeBytes {return Data(Array($0))}
return keyBytes
}
return nil
}
func symEncrypt(payload : Data, aesKey : Data) -> [Data] {
let mac = digest(input: aesKey + payload)
@ -176,5 +184,4 @@ public class SwiftNativeCryptoPlugin: NSObject, FlutterPlugin {
return nil
}
}
}