Question

错误：致命错误：'试试！'表达式意外地引发了一个错误：CryptoSwift.AES.Error.BlockSizeExceeded：

我使用了这个AES https://github.com/krzyzanowskim/CryptoSwift和我的代码：

覆盖func viewDidLoad（）{ super.viewDidLoad（）

let jsonString = "{ \"device\": \"iphone\", \"req\": \"connect\", \"deviceId\": \"device ID\" }";

let url = UrlManager()
url.setRequestData(jsonString)
url.sendRequest({ (response) -> Void in
    print("Response data: \(response)")
    let bytes: [UInt8] = Converter.hexstringConvertToBytes(response)
    print("Bytes: \(bytes)")
    let dencryptedBytes: [UInt8] = try! bytes.decrypt(AES(key: UrlManager.CONNECTION_KEY, iv: UrlManager.CONNECTION_IV))
    print("Decoded Bytes: \(dencryptedBytes)")
    let jsonData: String = Converter.bytesConvertToString(dencryptedBytes)
    print("Received json: \(jsonData)")
})

UrlManager的方法：

internal func sendRequest（responseHandler :( response：String） - ＆gt; Void）{

SocketManager.sharedInstance.sendMessage(self.requestData, handler: responseHandler)

}

SocketManager方法：

internal func sendMessage（message：String，handler：（response：String） - ＆gt; Void）{

let qualityOfServiceClass = QOS_CLASS_BACKGROUND
let backgroundQueue = dispatch_get_global_queue(qualityOfServiceClass, 0)
dispatch_async(backgroundQueue, {
    // set response data to UrlManager
    let response = self.sendRequest(message, client: self.socket)
    handler(response: response!)

    dispatch_async(dispatch_get_main_queue(), { () -> Void in
        //print("This is run on the main queue")
    })

})

}

但这是工作（当我测试此代码时）：

让hexaString =“0B8F665884EE009C64A64862E26D33C42F490D6EF227709B1900D42B71FB2169802A27FACDCF2D5587A468E2AE0C14FD7FFC2D0D291A0021814A2D5EA4DC1225BE64B04C8CCA831CB1C97277040F5E36”

var numbers = [UInt8]()
var from = hexaString.startIndex
while from != hexaString.endIndex {
    let to = from.advancedBy(2, limit: hexaString.endIndex)
    numbers.append(UInt8(hexaString[from ..< to], radix: 16) ?? 0)
    from = to
}
print(numbers) // [215, 193, 122, 79]

let dencryptedBytes: [UInt8] = try! numbers.decrypt(AES(key: "be8d5ba39cde4e41", iv: "a5e5ff5dcd2a655c"))
print(dencryptedBytes)

if let str =  NSString(bytes: dencryptedBytes, length: dencryptedBytes.count, encoding: NSUTF8StringEncoding) as? String {
    print(str)
} else {
    print("not a valid UTF-8 sequence")
}

为什么？请告诉我。谢谢！

Answer 1

struct Error: ErrorType {

}

func f() throws -> Void {
    throw Error()
}

/*
try! f()    // expression unexpectedly raised an error: Error()
*/

let a = try? f()
a == nil    // true
do {
    try f()
} catch {
    print("ERROR")
}
// print "ERROR"

在您的情况下

CryptoSwift.AES.Error.BlockSizeExceeded，结果为nil

致命错误：'试试！'表达式意外地引发了一个错误：CryptoSwift.AES.Error.BlockSizeExceeded：

1 个答案: