跨平台加密和解密

Question

是否有任何支持iOS（Swift）和C＃应用程序的跨平台AES 256加密和解密。除了 https://github.com/Pakhee/Cross-platform-AES-encryption。

我想加密和解密所有的数据。

Answer 1

我在C＃，IOS和Android中对AES加密/解密使用了相同的类（https://github.com/Pakhee/Cross-platform-AES-encryption）。它可以很好地处理C＃和android，但不能与IOS一起工作。最终找到了在IOS中正常工作的以下解决方案。

#import <CommonCrypto/CommonCryptor.h> 

    - (void)viewDidLoad { 
     [super viewDidLoad]; 
     // Do any additional setup after loading the view, typically from a nib. 

     NSString *sData = @"Meet me at the secret location at 8pm"; 
     NSString *sIv = @"4QesEr03HwE5H1C+ICw7SA=="; 
     NSString *sKey = @"ovA6siPkyM5Lb9oNcnxLz676K6JK6FrJKk4efEUWBzg="; 

     NSData *dData = [sData dataUsingEncoding:NSUTF8StringEncoding]; 

     NSData *dEncrypt = [self doCipher:dData key:sKey iv:sIv context:kCCEncrypt]; 
     NSData *base64 = [dEncrypt base64EncodedDataWithOptions:0]; 
     NSString *sBase64 = [[NSString alloc] initWithData:base64 encoding:NSUTF8StringEncoding]; 
     NSLog(@"Base64 String: %@",sBase64); 

     NSData *dDecrypt= [self decrypt:dEncrypt key:sKey iv:sIv]; 
     NSString *sDecrypt = [[NSString alloc] initWithData:dDecrypt encoding:NSUTF8StringEncoding]; 
     NSLog(@"Decrypted Data: %@",sDecrypt); 
    } 

    - (NSData *)doCipher:(NSData *)plainText 
        key:(NSString *)key 
         iv:(NSString *)iv 
       context:(CCOperation)encryptOrDecrypt 
    { 
     NSUInteger dataLength = [plainText length]; 

     size_t buffSize = dataLength + kCCBlockSizeAES128; 
     void *buff = malloc(buffSize); 

     size_t numBytesEncrypted = 0; 

     NSData *dIv = [iv dataUsingEncoding:NSUTF8StringEncoding]; 
     NSData *dKey = [key dataUsingEncoding:NSUTF8StringEncoding]; 

     CCCryptorStatus status = CCCrypt(encryptOrDecrypt, 
             kCCAlgorithmAES128, 
             kCCOptionPKCS7Padding, 
             dKey.bytes, kCCKeySizeAES256, 
             dIv.bytes, 
             [plainText bytes], [plainText length], 
             buff, buffSize, 
             &numBytesEncrypted); 
     if (status == kCCSuccess) { 
      return [NSData dataWithBytesNoCopy:buff length:numBytesEncrypted]; 
     } 

     free(buff); 
     return nil; 
    } 

欲了解更多详情检查此主题。 Decrypt a base64 string using C# generated by iOs CCCrypt function using AES

Answer 2

在一个项目中需要跨平台（C＃，Android，IOS）AES加密/解密。 我试过https://github.com/Pakhee/Cross-platform-AES-encryption，但它会造成IOS的问题。 所以我实现了AES，它可以很好地与C＃，IOS和Android一起使用。

C＃

public class AESCrypto 
     { 
      /// <summary> 
      /// Encrpyts the sourceString, returns this result as an Aes encrpyted, BASE64 encoded string 
      /// </summary> 
      /// <param name="plainSourceStringToEncrypt">a plain, Framework string (ASCII, null terminated)</param> 
      /// <param name="passPhrase">The pass phrase.</param> 
      /// <returns> 
      /// returns an Aes encrypted, BASE64 encoded string 
      /// </returns> 
      public static string EncryptString(string plainSourceStringToEncrypt, string passPhrase) 
      { 
       //Set up the encryption objects 
       using (AesCryptoServiceProvider acsp = GetProvider(Encoding.Default.GetBytes(passPhrase))) 
       { 
        byte[] sourceBytes = Encoding.ASCII.GetBytes(plainSourceStringToEncrypt); 
        ICryptoTransform ictE = acsp.CreateEncryptor(); 

        //Set up stream to contain the encryption 
        MemoryStream msS = new MemoryStream(); 

        //Perform the encrpytion, storing output into the stream 
        CryptoStream csS = new CryptoStream(msS, ictE, CryptoStreamMode.Write); 
        csS.Write(sourceBytes, 0, sourceBytes.Length); 
        csS.FlushFinalBlock(); 

        //sourceBytes are now encrypted as an array of secure bytes 
        byte[] encryptedBytes = msS.ToArray(); //.ToArray() is important, don't mess with the buffer 

        //return the encrypted bytes as a BASE64 encoded string 
        return Convert.ToBase64String(encryptedBytes); 
       } 
      } 


      /// <summary> 
      /// Decrypts a BASE64 encoded string of encrypted data, returns a plain string 
      /// </summary> 
      /// <param name="base64StringToDecrypt">an Aes encrypted AND base64 encoded string</param> 
      /// <param name="passphrase">The passphrase.</param> 
      /// <returns>returns a plain string</returns> 
      public static string DecryptString(string base64StringToDecrypt, string passphrase) 
      { 
       //Set up the encryption objects 
       using (AesCryptoServiceProvider acsp = GetProvider(Encoding.Default.GetBytes(passphrase))) 
       { 
        byte[] RawBytes = Convert.FromBase64String(base64StringToDecrypt); 
        ICryptoTransform ictD = acsp.CreateDecryptor(); 

        //RawBytes now contains original byte array, still in Encrypted state 

        //Decrypt into stream 
        MemoryStream msD = new MemoryStream(RawBytes, 0, RawBytes.Length); 
        CryptoStream csD = new CryptoStream(msD, ictD, CryptoStreamMode.Read); 
        //csD now contains original byte array, fully decrypted 

        //return the content of msD as a regular string 
        return (new StreamReader(csD)).ReadToEnd(); 
       } 
      } 

      private static AesCryptoServiceProvider GetProvider(byte[] key) 
      { 
       AesCryptoServiceProvider result = new AesCryptoServiceProvider(); 
       result.BlockSize = 128; 
       result.KeySize = 128; 
       result.Mode = CipherMode.CBC; 
       result.Padding = PaddingMode.PKCS7; 

       result.GenerateIV(); 
       result.IV = new byte[] {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; 

       byte[] RealKey = GetKey(key, result); 
       result.Key = RealKey; 
       // result.IV = RealKey; 
       return result; 
      } 

      private static byte[] GetKey(byte[] suggestedKey, SymmetricAlgorithm p) 
      { 
       byte[] kRaw = suggestedKey; 
       List<byte> kList = new List<byte>(); 

       for (int i = 0; i < p.LegalKeySizes[0].MinSize; i += 8) 
       { 
        kList.Add(kRaw[(i/8) % kRaw.Length]); 
       } 
       byte[] k = kList.ToArray(); 
       return k; 
      } 
     } 

**JAVA -Andorid** 

public class AESHelper { 

    /*This method use to encript the sting */ 
    public static String encrypt(String inputString) throws Exception { 
     byte[] result = encrypt(inputString.getBytes()); 
     String result1 = Base64.encodeToString(result, 
       Base64.NO_WRAP);//Instead of Default 
     return result1; 
    } 

    public static String decrypt(String encrypted) throws Exception { 
     byte[] data = Base64.decode(encrypted, Base64.NO_WRAP); 
     byte[] result = decrypt(data); 
     String original = new String(result, "UTF-8"); 

     return new String(original); 
    } 

    /*This method return encrypted text with byte code*/ 
    private static byte[] encrypt(byte[] message) throws Exception { 
     byte[] KEY = ConstantData.key.getBytes();//Key for encryption 

     SecretKeySpec skeySpec = new SecretKeySpec(KEY, "AES"); 
     byte[] ivx = new byte[] {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};//make same as web team 
     IvParameterSpec ivSpec = new IvParameterSpec(ivx); 
     Cipher ecipher = Cipher.getInstance("AES/CBC/PKCS7Padding"); 
     ecipher.init(Cipher.ENCRYPT_MODE, skeySpec, ivSpec); 

     byte[] encrypted = ecipher.doFinal(message); 
     return encrypted; 
    } 

    private static byte[] decrypt(byte[] encrypted) throws Exception { 
     byte[] KEY = ConstantData.key.getBytes();//Key for decrypt 

     SecretKeySpec skeySpec = new SecretKeySpec(KEY, "AES"); 
     Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding"); 
     byte[] ivx = new byte[] {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};//make same as web team 
     IvParameterSpec ivSpec = new IvParameterSpec(ivx); 

     cipher.init(Cipher.DECRYPT_MODE, skeySpec,ivSpec); 
     byte[] decrypted = cipher.doFinal(encrypted); 
     return decrypted; 
    } 

对于IOS有几个文件，所以不能把代码here.You可以从以下网址找到源代码。 https://drive.google.com/file/d/0B05dZSkNGcb-RXkxcjBNd21TNXc/view?usp=sharing