在 Swift 中使用 application/vnd.wfa.wsc 创建 NDEF WiFi 记录

Question

我正在尝试在 Swift 中创建 application/vnd.wfa.wsc 有效负载。我在这里为 Android 找到了这篇文章： Creating an NDEF WiFi record using application/vnd.wfa.wsc in Android

我一直坚持创建我想在 NFC 标签上写入的有效负载。我尝试将 java 代码翻译成 swift 并将有效负载写入 NFC 标签，但我无法使用 android 手机读取数据。

let VERSION: [UInt8] = [0x10, 0x4A]
let CREDENTIAL: [UInt8] = [0x10, 0x0e]
let AUTH_TYPE: [UInt8]    = [0x10, 0x03]
let CRYPT_TYPE: [UInt8]   = [0x10, 0x0F]
let MAC_ADDRESS: [UInt8]  = [0x10, 0x20]
let NETWORK_IDX: [UInt8]  = [0x10, 0x26]
let NETWORK_KEY: [UInt8]  = [0x10, 0x27]
let NETWORK_NAME: [UInt8] = [0x10, 0x45]
let OOB_PASSWORD: [UInt8] = [0x10, 0x2C]
let VENDOR_EXT: [UInt8]   = [0x10, 0x49]
let VENDOR_WFA: [UInt8]   = [0x00, 0x37, 0x2A]
let VERSION2: [UInt8]     = [0x00]
let KEY_SHAREABLE: [UInt8] = [0x02]
let AUTH_OPEN: [UInt8] = [0x00, 0x01]
let AUTH_WPA_PERSONAL: [UInt8] = [0x00, 0x02]
let AUTH_SHARED: [UInt8] = [0x00, 0x04]
let AUTH_WPA_ENTERPRISE: [UInt8] = [0x00, 0x08]
let AUTH_WPA2_ENTERPRISE: [UInt8] = [0x00, 0x10]
let AUTH_WPA2_PERSONAL: [UInt8] = [0x00, 0x20]
let AUTH_WPA_WPA2_PERSONAL: [UInt8] = [0x00, 0x22]
let CRYPT_NONE: [UInt8] = [0x00, 0x01]
let CRYPT_WEP: [UInt8] = [0x00, 0x02]
let CRYPT_TKIP: [UInt8] = [0x00, 0x04]
let CRYPT_AES: [UInt8] = [0x00, 0x08]
let CRYPT_AES_TKIP: [UInt8] = [0x00, 0x0C]

let credential: [UInt8] = [0x00, 0x36]
let idx: [UInt8] = [0x00, 0x01, 0x01]

let ssid = "TestWifi"
let password = "Test12345"

let ssidBytes: [UInt8] = Array(ssid.utf8)
let passwordBytes: [UInt8] = Array(password.utf8)
let authBytes: [UInt8] = Array("WPA PSK".utf8)

let lengthSSID: [UInt8] = [UInt8(ssid.lengthOfBytes(using: .utf8))]
let lengthPassword: [UInt8] = [UInt8(password.lengthOfBytes(using: .utf8))]

let cred: [UInt8] = CREDENTIAL + credential
let index: [UInt8] = NETWORK_IDX + idx
let network: [UInt8] = NETWORK_NAME + lengthSSID + ssidBytes
let auth: [UInt8] = AUTH_TYPE + AUTH_WPA_PERSONAL + authBytes
let crypt: [UInt8] = CRYPT_TYPE + CRYPT_WEP + CRYPT_AES_TKIP
let netw: [UInt8] = NETWORK_KEY + lengthPassword + passwordBytes

let foo1 = cred + index
let foo2 = network + auth
let foo3 = crypt + netw

let payload = foo1 + foo2 + foo3

let type = Data(base64Encoded: "application/vnd.wfa.wsc".base64Encoded()!)!
let identifier = Data(base64Encoded: "".base64Encoded()!)!
let payloadData = Data(bytes: payload, count: payload.count)
let payload = NFCNDEFPayload(format: .media, type: type, identifier: identifier, payload: payloadData)

谁能指出我做错了什么？

Answer 1

1) 凭证 TLV 由子 TLV[

以下是创建有效负载的 Swift 代码。 TODO：（1）我可能需要检查所需的字节序并重新排序各个字段（2）您可能需要检查此 API 的其他参数

import Foundation
import Glibc

/* TotalLen is count of all bytes in parenthesis.  

CREDENTIAL + totallen +   
(  
NETWORK_IDX + Idxlen + idx  
NETWORK_NAME + Namelen + ssidBytes  
AUTH_TYPE + Authlen + AUTH_WPA_PERSONAL  
CRYPT_TYPE + Cryptlen + AUTH_MIXED  
NETWORK_KEY + Keylen + passwordBytes  
MAC_ADDRESS + Maclen + addr  
)  

0x100E + **TotalLen** +  
(0x1026 + 0x0001 + 01 +  
0x1045 + 0x0008 + TestWifi +  
0x1003 + 0x0002 + 0x0002 +  
0x100F + 0x0002 + 0x000C (Mixed mode supporting TKIP, AES) + 
0x1027 + 0x0009 + Test12345 +
0x1020 + 0x0006 + address) */

//Attributes
let VERSION: [UInt8] = [0x10, 0x4A]
let CREDENTIAL: [UInt8] = [0x10, 0x0e]
let AUTH_TYPE: [UInt8]    = [0x10, 0x03]
let CRYPT_TYPE: [UInt8]   = [0x10, 0x0F]
let MAC_ADDRESS: [UInt8]  = [0x10, 0x20]
let NETWORK_IDX: [UInt8]  = [0x10, 0x26]
let NETWORK_KEY: [UInt8]  = [0x10, 0x27]
let NETWORK_NAME: [UInt8] = [0x10, 0x45]
let OOB_PASSWORD: [UInt8] = [0x10, 0x2C]
let VENDOR_EXT: [UInt8]   = [0x10, 0x49]
let VENDOR_WFA: [UInt8]   = [0x00, 0x37, 0x2A]
let VERSION2: [UInt8]     = [0x00]
let KEY_SHAREABLE: [UInt8] = [0x02]
let AUTH_OPEN: [UInt8] = [0x00, 0x01]
let AUTH_WPA_PERSONAL: [UInt8] = [0x00, 0x02]
let AUTH_SHARED: [UInt8] = [0x00, 0x04]
let AUTH_WPA_ENTERPRISE: [UInt8] = [0x00, 0x08]
let AUTH_MIXED: [UInt8] = [0x00, 0x0C]
let AUTH_WPA2_ENTERPRISE: [UInt8] = [0x00, 0x10]
let AUTH_WPA2_PERSONAL: [UInt8] = [0x00, 0x20]
let AUTH_WPA_WPA2_PERSONAL: [UInt8] = [0x00, 0x22]
let CRYPT_NONE: [UInt8] = [0x00, 0x01]
let CRYPT_WEP: [UInt8] = [0x00, 0x02]
let CRYPT_TKIP: [UInt8] = [0x00, 0x04]
let CRYPT_AES: [UInt8] = [0x00, 0x08]
let CRYPT_AES_TKIP: [UInt8] = [0x00, 0x0C]

//Values
let idx: [UInt8] = [0x01]
let ssid = "TestWifi"
let ssidBytes: [UInt8] = Array(ssid.utf8)
let password = "Test12345"
let passwordBytes: [UInt8] = Array(password.utf8)
let addr: [UInt8] = [0x11, 0x22, 0x33, 0x44, 0x55, 0x66]

let authBytes: [UInt8] = Array("WPA PSK".utf8)

//Lengths
let Idxlen: [UInt8] = [0x00, 0x01]
var temp = ssid.lengthOfBytes(using: .utf8)
let Namelen: [UInt8] = [UInt8(temp >> 8), UInt8(temp)]
let Authlen: [UInt8] = [0x00, 0x02]
let Cryptlen: [UInt8] = [0x00, 0x02]
temp = password.lengthOfBytes(using: .utf8)
let Keylen: [UInt8] = [UInt8(temp >> 8), UInt8(temp)]
let Maclen: [UInt8] = [0x00, 0x06]

//Packet formation
let id = NETWORK_IDX + Idxlen + idx
let name = NETWORK_NAME + Namelen + ssidBytes
let aut = AUTH_TYPE + Authlen + AUTH_WPA_PERSONAL
let cry = CRYPT_TYPE + Cryptlen + AUTH_MIXED
let key = NETWORK_KEY + Keylen + passwordBytes
let mac = MAC_ADDRESS + Maclen + addr
var payload: [UInt8] = id + name + aut + cry + key + mac

//Prepend Credential Attribute header
let totallen = payload.count
var totallenBytes = [UInt8(totallen >> 8), UInt8(totallen)]
var cred = CREDENTIAL + totallenBytes
payload.insert(contentsOf:cred, at: 0)
print(payload)```

Answer 2

我使用 Wi-Fi Simple Configuration Technical Specification 的 2.0.7 版创建了以下解决方案

let type = "application/vnd.wfa.wsc".data(using: .utf8)!

let authenticationTypesString = ["Open", "WPA-Personal", "Shared", "WPA-Enterprise", "WPA2-Enterprise", "WPA2-Personal"]
let encryptionTypesString = ["None", "WEP", "TKIP", "AES", "AES/TKIP (mixed)"]

let authenticationTypes: [[UInt8]] = [[0x00, 0x01], [0x00, 0x02], [0x00, 0x04], [0x00, 0x08], [0x00, 0x10], [0x00, 0x20]]
let encryptionTypes: [[UInt8]] = [[0x00, 0x01], [0x00, 0x02], [0x00, 0x04], [0x00, 0x08], [0x00, 0x0c]]

let ssidString = "Network Name"
let networkKeyString = "Network Key"

let ssidBytes: [UInt8] = Array(ssidString.utf8)
let networkKeyBytes: [UInt8] = Array(networkKeyString.utf8)

let ssidLength = UInt8(ssidBytes.count)
let networkKeyLength = UInt8(networkKeyBytes.count)

let authenticationTypeBytes = authenticationTypes[5]
let encryptionTypeBytes = encryptionTypes[3]

let networkIndex: [UInt8]       = [0x10, 0x26, 0x00, 0x01, 0x01]
let ssid: [UInt8]               = [0x10, 0x45, 0x00, ssidLength] + ssidBytes
let authenticationType: [UInt8] = [0x10, 0x03, 0x00, 0x02] + authenticationTypeBytes
let encryptionType: [UInt8]     = [0x10, 0x0F, 0x00, 0x02] + encryptionTypeBytes
let networkKey: [UInt8]         = [0x10, 0x27, 0x00, networkKeyLength] + networkKeyBytes
let macAddress: [UInt8]         = [0x10, 0x20, 0x00, 0x06, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]

let credential = networkIndex + ssid + authenticationType + encryptionType + networkKey + macAddress
let credentialLength = UInt8(credential.count)

let bytes = [0x10, 0x0E, 0x00, credentialLength] + credential
let payload = Data(bytes: bytes, count: bytes.count)

let ndefPayload = NFCNDEFPayload(format: .media, type: type, identifier: Data(), payload: payload)

let ndefMessage = NFCNDEFMessage(records: [ndefPayload])

我希望这会有所帮助！

Answer 3

原始 Android 代码显示 lengthSSID 和 lengthPassword 是 2 字节数组，MSB 在第一个元素中，LSB 在第二个元素中。您的代码正在为这两个创建单个元素 [UInt8]，因此二进制格式不匹配。此代码会将 SSID 长度值填充到 2 个字节：

let lengthSSIDVal = ssid.lengthOfBytes(using: .utf8)
let lengthSSID: [UInt8] = [UInt8(lengthSSIDVal / 256), UInt8(lengthSSIDVal % 256)]

对 lengthPassword 执行相同操作。

其余代码看起来像是一个准确的端口，所以我怀疑是上面的问题，但还要确保 NDEF 是使用 application/vnd.wfa.wsc MIME 类型编写的。