ios - swift 3.1 中的 DES/ECB/NoPadding 使用 Common Crypto
<p><p>我想在我的 iOS 应用程序中使用 DES 加密和解密字符串(是的,我知道 DES 不再安全,但应用程序接收消息并将消息发送到使用它的 BLE 模块)。
我成功地为 Common Crypto 创建了一个桥接头,我找到了这个用于加密并将其修改为 DES 和 swift 3 <a href="https://stackoverflow.com/questions/29222642/asynchronous-encryption-in-swift/29230965#29230965" rel="noreferrer noopener nofollow">Asynchronous encryption in Swift</a>:</p>
<pre><code>func testCrypt(data:NSData, keyData:NSData, ivData:NSData, operation:CCOperation) -> NSData? {
let keyBytes = keyData.bytes.assumingMemoryBound(to: UInt8.self)
print("keyLength = \(keyData.length), keyData = \(keyData)")
let ivBytes = ivData.bytes.assumingMemoryBound(to: UInt8.self)
print("ivLength = \(ivData.length), ivData = \(ivData)")
let dataLength = Int(data.length)
let dataBytes = data.bytes.assumingMemoryBound(to: UInt8.self)
print("dataLength= \(dataLength), data = \(data)")
let cryptData: NSMutableData! = NSMutableData(length: Int(dataLength) + kCCBlockSizeDES)
let cryptPointer = cryptData.mutableBytes.assumingMemoryBound(to: UInt8.self)
let cryptLength= size_t(cryptData.length)
let keyLength = size_t(kCCKeySizeDES)
let algoritm:CCAlgorithm = UInt32(kCCAlgorithmDES)
let options: CCOptions = UInt32(kCCOptionECBMode)
var numBytesEncrypted :size_t = 0
let cryptStatus = CCCrypt(operation,
algoritm,
options,
keyBytes, keyLength,
ivBytes,
dataBytes, dataLength,
cryptPointer, cryptLength,
&numBytesEncrypted)
return cryptData;
}
</code></pre>
<p>函数调用和参数:</p>
<pre><code>override func viewDidLoad() {
super.viewDidLoad()
let ivString = "Use a random iv!"
let ivData = (ivString as NSString).data(using: String.Encoding.utf8.rawValue) as NSData!
let key = Data.init(bytes: )
let keyData = NSData.init(data: key)
let message = "Don´t try to read this text. Top Secret Stuff"
let data = (message as NSString).data(using: String.Encoding.utf8.rawValue) as NSData!
print("data: \(data)")
if let encryptedData = testCrypt(data: data!, keyData:keyData, ivData: ivData!, operation:UInt32(kCCEncrypt)) {
print("encryptedData: \(encryptedData)")
if let decryptedData = testCrypt(data: encryptedData, keyData:keyData, ivData: ivData!, operation:UInt32(kCCDecrypt)) {
let dec = Data.init(referencing: decryptedData)
print("decryptedData: \(decryptedData))")
}
}
}
</code></pre>
<p>预期结果 = <446f6ec2 b4742074 72792074 6f207265 61642074 68697320 74657874 2e20546f 70205365 63726574 20537475 6666></p>
<p>加密数据:<6081ada9 0487c0a5 35e542bd e9600861 4250a693 65573337 39df5525 66c40cd8 b358bf6a d9837f9c 00000000 00000000 00000000 0000></p>
<p>decryptedData = <446f6ec2 b4742074 72792074 6f207265 61642074 68697320 74657874 2e20546f 70205365 63726574 e0456e88 3f896b9b 00000000 00000000 00000000 0000></p>
<p>为什么解密只返回部分正确的结果?</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>所以似乎没有可用的 NoPadding 选项,最后我只是从 'cryptData' 初始化中删除了 '+ kCCBlockSizeDES' 并在我的字符串中添加了 '0' 字符,然后再加密它以达到正确的大小(例如长度8) 的倍数,然后在解密后我只是删除了零以获得原始字符串。</p></p>
<p style="font-size: 20px;">关于ios - swift 3.1 中的 DES/ECB/NoPadding 使用 Common Crypto,我们在Stack Overflow上找到一个类似的问题:
<a href="https://stackoverflow.com/questions/43200983/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/43200983/
</a>
</p>
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