How to send the encrypted string from iOS to .net

Question

I am using the AES encryption using the below code,

NSString *encryptedString =  [AESCrypt encrypt:@"str" password:@"password"];

The same string is not decoded correctly in .net server. The code is being used in .net server is as below,

AesEncryption = new RijndaelManaged();
AesEncryption.KeySize = 256;
AesEncryption.BlockSize = 128;
AesEncryption.Mode = CipherMode.CBC;
AesEncryption.Padding = PaddingMode.PKCS7;
string keyStr = "cGFWDwzc3dvcmQAAAAAAwzc3==";
string ivStr = "aEdcGFzc3dvcmQwzc3AvcmQAAAAA==";
byte[] ivArr = Convert.FromBase64String(keyStr);
byte[] keyArr = Convert.FromBase64String(ivStr);
AesEncryption.IV = ivArr;
AesEncryption.Key = keyArr;

Can you please help me on this.

I would suggest to use base64 encoding. – gurmandeep Jul 14 '16 at 11:06 — gurmandeep, Jul 14 '16 at 11:06

score 0 · Answer 1 · answered Jul 14 '16 at 11:17

Have you try below code for EncodeToPercentEscapeString to encrypt you string.

-(NSString *) encodeToPercentEscapeString
{
    return (__bridge_transfer NSString *) CFURLCreateStringByReplacingPercentEscapes(NULL,
                                                                            (CFStringRef) self,
                                                                            ((CFStringRef) @" !*'();:@&=+$,/?%#[]"));
}

NSString *password = @"password_123";
NSString *encryptString = [password encodeToPercentEscapeString];

score 0 · Answer 2 · edited May 23 '17 at 12:24

0

We do have AES , SHA , MDM5 etc encryption techniques available in iOS to encrypt the data/strings for ensuring the security of data transmit over the air,

Specifically i prefer to use AES 256 encryption you can follow the tutorial for encryption of your string given in the URL : http://robnapier.net/aes-commoncrypto

Once you encrypted your string , you can send that to .net/ back end using web service.

To send the data to .net using web service the answer with 3 reputations in the question here : Send parameters to a web service will help you.

edited May 23 '17 at 12:24

Community

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answered Jul 14 '16 at 11:21

iShwar

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Hi, Can i get the download link for that RNCryptor. – Sai Bharath Yadav Jul 14 '16 at 11:41

score 0 · Answer 3 · answered Jul 14 '16 at 11:53

0

For a starter, you mixes up iv and key:

                                        VVVVVV
byte[] ivArr = Convert.FromBase64String(keyStr);
byte[] keyArr = Convert.FromBase64String(ivStr);
                                         ^^^^^^

answered Jul 14 '16 at 11:53

Ebbe M. Pedersen

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score 0 · Accepted Answer · answered Jul 15 '16 at 13:49

0

Use the below link: Add iOS files and implement the same provided in the header files and ask your .Net developer to work on the same.

https://github.com/Pakhee/Cross-platform-AES-encryption

answered Jul 15 '16 at 13:49

Bharath

190
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That library is terrible. RNCryptor is a much better alternative. – Artjom B. Jul 16 '16 at 21:26

How to send the encrypted string from iOS to .net

4 Answers4