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POTriple DES interoperability between .Net and iPhone?
 

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  1. POTriple DES interoperability between .Net and iPhone?
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    <p>I need to encrypt a string on the iPhone and send it to a .Net for decryption using Triple DES. I am able to encrypt/decrypt on the iPhone and with .Net, but I get different results in both platforms.</p> <p>I use the very same code as the encryption/decryption with AES between .Net and iPhone in <a href="http://dotmac.rationalmind.net/2009/02/aes-interoperability-between-net-and-iphone/" rel="nofollow noreferrer">here</a></p> <p>The only thing that I changed .net is the encryption algorithm, so where it says AesCryptoServiceProvider, I put TripleDesServiceProvider</p> <p>As in .net the only thing that I changed is the encryption algorithm, so where it says kCCAlgorithmAES128, I put kCCAlgorithm3DES</p> <p>What am I missing? </p> <p>[UPDATE]</p> <p>Thanks for your responses.</p> <p>If I stay in the same platform I can encrypt/decrypt without a problem, but if I encrypt in iPhone and decrypt in .net there is a problem because in each platform has different results with the same inputs.</p> <p>As Overslacked said I think the problem has to do with salt, but I couldn't find any sha or md5 documentation that the algorithm is using in each platform, or any parameter to customize this. </p> <p>Here is the code that I am actually using in iPhone:</p> <pre><code>int main(int argc, char *argv[]){ NSString * _secret = @"hello"; NSString * _key = @"1234567890"; _out = [self doCipher:_secret key:_key context:kCCEncrypt]; NSLog(@"encrypted data in str: %@", _out); _outDecrypted = [StringEncryption doCipher:_out key:_key context:kCCDecrypt]; NSLog(@"decrypted data in str: %@", _outDecrypted); } + (NSString *)doCipher:(NSString *)sTextIn key:(NSString *)sKey context:(CCOperation)encryptOrDecrypt { NSMutableData * dTextIn; if (encryptOrDecrypt == kCCDecrypt) { dTextIn = [[[NSData alloc] base64DecodeString:sTextIn ]mutableCopy]; } else{ dTextIn = [[sTextIn dataUsingEncoding: NSASCIIStringEncoding]mutableCopy]; } NSMutableData * dKey = [[sKey dataUsingEncoding:NSASCIIStringEncoding]mutableCopy]; [dKey setLength:24]; uint8_t *bufferPtr1 = NULL; size_t bufferPtrSize1 = 0; size_t movedBytes1 = 0; uint8_t iv[kCCBlockSize3DES]; memset((void *) iv, 0x0, (size_t) sizeof(iv)); bufferPtrSize1 = ([sTextIn length] + kCCBlockSize3DES) &amp; ~(kCCBlockSize3DES -1); bufferPtr1 = malloc(bufferPtrSize1 * sizeof(uint8_t)); memset((void *)bufferPtr1, 0x00, bufferPtrSize1); ccStatus = CCCrypt(encryptOrDecrypt, // CCOperation op kCCAlgorithm3DES, // CCAlgorithm alg kCCOptionPKCS7Padding, // CCOptions options [dKey bytes], // const void *key [dKey length], // size_t keyLength iv, // const void *iv [dTextIn bytes], // const void *dataIn [dTextIn length], // size_t dataInLength (void *)bufferPtr1, // void *dataOut bufferPtrSize1, // size_t dataOutAvailable &amp;movedBytes1); // size_t *dataOutMoved NSString * sResult; if (encryptOrDecrypt == kCCDecrypt){ sResult = [[[ NSString alloc] initWithData:[NSData dataWithBytes:bufferPtr1 length:movedBytes1] encoding:NSASCIIStringEncoding] autorelease]; } else { NSData *dResult = [NSData dataWithBytes:bufferPtr1 length:movedBytes1]; sResult = [dResult base64EncodeData:dResult]; } return sResult; } </code></pre> <p>Here is the code that I am using for .net</p> <pre><code> class Program { static void Main(string[] args) { string key = "1234567890"; string secret = "hello"; string crypto = EncryptedString.EncryptString(secret, key); Console.WriteLine(crypto); secret = EncryptedString.DecryptString(crypto, key); Console.WriteLine(secret); Main(null); } } public class EncryptedString { public static string EncryptString(string plainSourceStringToEncrypt, string passPhrase) { //Set up the encryption objects using (TripleDESCryptoServiceProvider acsp = GetProvider(Encoding.ASCII.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 String b64 = System.Text.ASCIIEncoding.ASCII.GetString(encryptedBytes); return Convert.ToBase64String(encryptedBytes); } } public static string DecryptString(string base64StringToDecrypt, string passphrase) { //Set up the encryption objects using (TripleDESCryptoServiceProvider acsp = GetProvider(Encoding.Default.GetBytes(passphrase))) { byte[] RawBytes = Convert.FromBase64String(base64StringToDecrypt); ICryptoTransform ictD = acsp.CreateDecryptor(); MemoryStream msD = new MemoryStream(RawBytes, 0, RawBytes.Length); CryptoStream csD = new CryptoStream(msD, ictD, CryptoStreamMode.Read); return (new StreamReader(csD)).ReadToEnd(); } } private static TripleDESCryptoServiceProvider GetProvider(byte[] key) { TripleDESCryptoServiceProvider result = new TripleDESCryptoServiceProvider(); result.Mode = CipherMode.CBC; result.Padding = PaddingMode.PKCS7; result.IV = new byte[] { 0, 0, 0, 0, 0, 0, 0, 0 }; result.Key = key; return result; } } </code></pre>
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    1. COAES and TripleDES are completely different algorithms.
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    2. COWhat do you mean, "I get different results in both platforms." What is different? When encryption is used correctly, a given plaintext should produce different ciphertext each time it is encrypted. Is that what you're seeing?
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    3. COI need to use TripleDes instead of AES. If I encrypt secret="hello" key="1234567890" I get in iphone="My8ZTBX07jU=", and in .net="qpbpZnxzFqQ="
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