swift中的DES加密解密算法
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【中文标题】swift中的DES加密解密算法【英文标题】：DES Encryption and decryption algorithm in swift 【发布时间】：2019-02-25 09:13:02 【问题描述】：我正在尝试使用 DES 算法在 swift 中进行加密和解密
但是对于我编写的代码，加密消息在每次构建时都会发生变化
这是我的代码：
import UIKit
import CommonCrypto
public class IAppEncryptionUtitlity: NSObject
private override init()
public static let sharedNetworkVar: IAppEncryptionUtitlity = IAppEncryptionUtitlity()
let key = IAppConfig.key
func myEncrypt(encryptData:String) -> NSData?
var myKeyData : NSData = ("DyfmgL9p" as NSString).data(using: String.Encoding.utf8.rawValue)! as NSData
var myRawData : NSData = encryptData.data(using: String.Encoding.utf8)! as NSData
var iv : [UInt8] = [56, 101, 63, 23, 96, 182, 209, 205] // I didn't use
var buffer_size : size_t = myRawData.length + kCCBlockSize3DES
var buffer = UnsafeMutablePointer<NSData>.allocate(capacity: buffer_size)
var num_bytes_encrypted : size_t = 0
let operation: CCOperation = UInt32(kCCEncrypt)
let algoritm: CCAlgorithm = UInt32(kCCAlgorithm3DES)
let options: CCOptions = UInt32(kCCOptionECBMode + kCCOptionPKCS7Padding)
let keyLength = size_t(kCCKeySize3DES)
var Crypto_status: CCCryptorStatus = CCCrypt(operation, algoritm, options, myKeyData.bytes, keyLength, nil, myRawData.bytes, myRawData.length, buffer, buffer_size, &num_bytes_encrypted)
if UInt32(Crypto_status) == UInt32(kCCSuccess)
var myResult: NSData = NSData(bytes: buffer, length: num_bytes_encrypted)
free(buffer)
print("my result \(myResult)") //This just prints the data
let keyData: NSData = myResult
let hexString = keyData.hexEncodedString()
print("hex result \(keyData)") // I needed a hex string output
//myDecrypt(decryptData: myResult) // sent straight to the decryption function to test the data output is the same
return myResult
else
free(buffer)
return nil
func myDecrypt(decryptData : NSData) -> NSData?
var mydata_len : Int = decryptData.length
var keyData : NSData = ("myEncryptionKey" as NSString).data(using: String.Encoding.utf8.rawValue)! as NSData
var buffer_size : size_t = mydata_len+kCCBlockSizeAES128
var buffer = UnsafeMutablePointer<NSData>.allocate(capacity: buffer_size)
var num_bytes_encrypted : size_t = 0
var iv : [UInt8] = [56, 101, 63, 23, 96, 182, 209, 205] // I didn't use
let operation: CCOperation = UInt32(kCCDecrypt)
let algoritm: CCAlgorithm = UInt32(kCCAlgorithm3DES)
let options: CCOptions = UInt32(kCCOptionPKCS7Padding)
let keyLength = size_t(kCCKeySize3DES)
var decrypt_status : CCCryptorStatus = CCCrypt(operation, algoritm, options, keyData.bytes, keyLength, nil, decryptData.bytes, mydata_len, buffer, buffer_size, &num_bytes_encrypted)
if UInt32(decrypt_status) == UInt32(kCCSuccess)
var myResult : NSData = NSData(bytes: buffer, length: num_bytes_encrypted)
free(buffer)
print("decrypt \(myResult)")
var stringResult = NSString(data: myResult as Data, encoding:String.Encoding.utf8.rawValue)
print("my decrypt string \(stringResult!)")
return myResult
else
free(buffer)
return nil
extension NSData
struct HexEncodingOptions: OptionSet
let rawValue: Int
static let upperCase = HexEncodingOptions(rawValue: 1 << 0)
func hexEncodedString(options: HexEncodingOptions = []) -> String
let format = options.contains(.upperCase) ? "%02hhX" : "%02hhx"
//var map = String(format: format, $0) .joined()
return ""
每次构建的输出都在变化。代码有什么问题或
而且kCCOptionPKCS7Padding和kCCOptionPKCS5Padding是一样的吗？
提前致谢
【问题讨论】：
不幸的是，作为只尝试过一次 Swift 的人（尽管我猜这更像是 ObjectiveC 而不是 Swift），我没有立即看到错误。但是，关于您关于填充的最后一个问题，that I can answer。 你应该给出一些输入和输出，以便一些可以测试。 您还应该证明您在 2019 年使用 DES 的原因... @LukeJoshuaPark 因为它早已在 .net 和 android 中实现，现在在 ios 中实现了相同的功能，所以除了 DES 没有其他选择 嗯，您确实有许多其他选择 - 例如将 .NET 和 Android 更改为使用 AES。您是否知道 DES 密钥可以在标准笔记本电脑上在几个小时内被破解？ 【参考方案1】：通过更改代码得到解决方案
import UIKit
import CommonCrypto
var message: String?
public class IAppEncryptionUtitlity: NSObject
//Calling method to encrypt using extensions
public func methodToCallEncryption( stringToEncrypt : String ) ->String
let iVValue:String = "nzug8FrX"
let keyValue = IAppConfig.key //DyfmgL9p
let encoded = stringToEncrypt.desEncrypt( key : keyValue , iv : iVValue )
return encoded!
public func methodToCallDecryption( stringToDecrypt : String ) -> String
let iVValue:String = "nzug8FrX"
let keyValue = IAppConfig.key //DyfmgL9p
let decoded = stringToDecrypt.desEncrypt( key : keyValue , iv : iVValue )
return decoded!
extension String
func desEncrypt(key:String, iv:String, options:Int = kCCOptionPKCS7Padding) -> String?
if let keyData = key.data(using: String.Encoding.utf8),
let data = self.data(using: String.Encoding.utf8),
let cryptData = NSMutableData(length: Int((data.count)) + kCCBlockSizeDES)
let keyLength = size_t(kCCKeySizeDES)
let operation: CCOperation = UInt32(kCCEncrypt)
let algoritm: CCAlgorithm = UInt32(kCCAlgorithmDES)
let options: CCOptions = UInt32(options)
var numBytesEncrypted :size_t = 0
let cryptStatus = CCCrypt(operation,
algoritm,
options,
(keyData as NSData).bytes, keyLength,
iv,
(data as NSData).bytes, data.count,
cryptData.mutableBytes, cryptData.length,
&numBytesEncrypted)
if UInt32(cryptStatus) == UInt32(kCCSuccess)
cryptData.length = Int(numBytesEncrypted)
let base64cryptString = cryptData.base64EncodedString(options: .lineLength64Characters)
return base64cryptString
else
return nil
return nil
func desDecrypt(key:String, iv:String, options:Int = kCCOptionPKCS7Padding) -> String?
if let keyData = key.data(using: String.Encoding.utf8),
let data = NSData(base64Encoded: self, options: .ignoreUnknownCharacters),
let cryptData = NSMutableData(length: Int((data.length)) + kCCBlockSizeDES)
let keyLength = size_t(kCCKeySizeDES)
let operation: CCOperation = UInt32(kCCDecrypt)
let algoritm: CCAlgorithm = UInt32(kCCAlgorithmDES)
let options: CCOptions = UInt32(options)
var numBytesEncrypted :size_t = 0
let cryptStatus = CCCrypt(operation,
algoritm,
options,
(keyData as NSData).bytes, keyLength,
iv,
data.bytes, data.length,
cryptData.mutableBytes, cryptData.length,
&numBytesEncrypted)
if UInt32(cryptStatus) == UInt32(kCCSuccess)
cryptData.length = Int(numBytesEncrypted)
let unencryptedMessage = String(data: cryptData as Data, encoding:String.Encoding.utf8)
return unencryptedMessage
else
return nil
return nil
感谢大家的帮助
【讨论】：
【参考方案2】：我们可以使用如下所示的字符串类别来进行所有对称加密和解密，包括 DES、3DES 和 AES。
/// Extension for Symmetric Encryption and Decryption with DES, 3DES, AES algorithms
extension String
/// Encrypts message with DES algorithm
func desEncrypt(key:String) -> String?
return symetricEncrypt(key: key, blockSize: kCCBlockSizeDES, keyLength: size_t(kCCKeySizeDES), algorithm: UInt32(kCCAlgorithmDES))
/// Encrypts message with 3DES algorithm
func tripleDesEncrypt(key:String) -> String?
return symetricEncrypt(key: key, blockSize: kCCBlockSize3DES, keyLength: size_t(kCCKeySize3DES), algorithm: UInt32(kCCAlgorithm3DES))
/// Encrypts message with AES 128 algorithm
func aes128Encrypt(key:String) -> String?
return symetricEncrypt(key: key, blockSize: kCCBlockSizeAES128, keyLength: size_t(kCCKeySizeAES128), algorithm: UInt32(kCCAlgorithmAES128))
/// Encrypts message with AES algorithm
func aesEncrypt(key:String) -> String?
return symetricEncrypt(key: key, blockSize: kCCBlockSizeAES128, keyLength: size_t(kCCKeySizeAES256), algorithm: UInt32(kCCAlgorithmAES))
/// Encrypts a message with symmetric algorithm
func symetricEncrypt(key:String, blockSize: Int, keyLength: size_t, algorithm: CCAlgorithm, options: Int = kCCOptionPKCS7Padding) -> String?
let keyData = key.data(using: String.Encoding.utf8)! as NSData
let data = self.data(using: String.Encoding.utf8)! as NSData
let cryptData = NSMutableData(length: Int(data.length) + blockSize)!
let operation: CCOperation = UInt32(kCCEncrypt)
var numBytesEncrypted :size_t = 0
let cryptStatus = CCCrypt(operation,
algorithm,
UInt32(options),
keyData.bytes, keyLength,
nil,
data.bytes, data.length,
cryptData.mutableBytes, cryptData.length,
&numBytesEncrypted)
if UInt32(cryptStatus) == UInt32(kCCSuccess)
cryptData.length = Int(numBytesEncrypted)
let base64cryptString = cryptData.base64EncodedString(options: .lineLength64Characters)
return base64cryptString
else
return nil
/// Decrypts message with DES algorithm
func desDecrypt(key:String) -> String?
return symetricDecrypt(key: key, blockSize: kCCBlockSizeDES, keyLength: size_t(kCCKeySizeDES), algorithm: UInt32(kCCAlgorithmDES))
/// Decrypts message with 3DES algorithm
func tripleDesDecrypt(key:String) -> String?
return symetricDecrypt(key: key, blockSize: kCCBlockSize3DES, keyLength: size_t(kCCKeySize3DES), algorithm: UInt32(kCCAlgorithm3DES))
/// Decrypts message with AES 128 algorithm
func aes128Decrypt(key:String) -> String?
return symetricDecrypt(key: key, blockSize: kCCBlockSizeAES128, keyLength: size_t(kCCKeySizeAES128), algorithm: UInt32(kCCAlgorithmAES128))
/// Decrypts message with AES algorithm
func aesDecrypt(key:String) -> String?
return symetricDecrypt(key: key, blockSize: kCCBlockSizeAES128, keyLength: size_t(kCCKeySizeAES256), algorithm: UInt32(kCCAlgorithmAES))
/// Decrypts a message with symmetric algorithm
func symetricDecrypt(key:String, blockSize: Int, keyLength: size_t, algorithm: CCAlgorithm, options: Int = kCCOptionPKCS7Padding) -> String?
if let keyData = key.data(using: String.Encoding.utf8),
let data = NSData(base64Encoded: self, options: .ignoreUnknownCharacters),
let cryptData = NSMutableData(length: Int((data.length)) + blockSize)
let operation: CCOperation = UInt32(kCCDecrypt)
var numBytesEncrypted :size_t = 0
let cryptStatus = CCCrypt(operation,
algorithm,
UInt32(options),
(keyData as NSData).bytes, keyLength,
nil,
data.bytes, data.length,
cryptData.mutableBytes, cryptData.length,
&numBytesEncrypted)
if UInt32(cryptStatus) == UInt32(kCCSuccess)
cryptData.length = Int(numBytesEncrypted)
let unencryptedMessage = String(data: cryptData as Data, encoding:String.Encoding.utf8)
return unencryptedMessage
else
return nil
return nil
完整来源： https://gist.github.com/tharindu/1cf0201492e41f1c287e51abb02902cd
【讨论】：
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