Dot Mac

Thanks for posting this code!

This is great, thanks for the example, it works perfectly.

Hi, this is just what i was looking for… but i need decryption in PHP…:(

I’m thinking to buy this: http://www.phpaes.com on their site there’s a demo utility to encrypt or decrypt strings…but i cant get the same result as the iphone program you provided… would you please try, too? maybe im messing with mode and iv..thanks so much

hi, a quick question
i get encrypted data to export as NSString say “u+8tQsPIHhr1Ll5TKBdbdSZmLEX/cD/xYY34kLPIPFc=”

which is good, if I decrypt encrypted data it works but when I take this export string (above) and try to created NSDATA object
NSData* encData = [NSData dataWithBase64EncodedString:"u+8tQsPIHhr1Ll5TKBdbdSZmLEX/cD/xYY34kLPIPFc="];

then i cannot get encoded string decoded.

Here is full sample:

NSString * _secret = @”My Encryption Key”;
NSString * _key = @”1234123412341234″;

StringEncryption *crypto = [[[StringEncryption alloc] init] autorelease];
NSData *_secretData = [_secret dataUsingEncoding:NSUTF8StringEncoding];
CCOptions padding = kCCOptionPKCS7Padding;
NSData *encryptedData = [crypto encrypt:_secretData key:[_key dataUsingEncoding:NSUTF8StringEncoding] padding:&padding];

NSString* encDataToExport = [encryptedData base64EncodingWithLineLength:0];

// do reverse -> from encrypted data to unencrypted

NSData* encData = [NSData dataWithBase64EncodedString:encDataToExport]; // gives me 427 bytes somehow!!!!!!!!!

NSData* decryptedData = [crypto decrypt:encData key:[_key dataUsingEncoding:NSUTF8StringEncoding] padding:&padding]; // returns nil

NSString* str = [[NSString alloc] initWithData:decryptedData encoding:NSUTF8StringEncoding];
NSLog(@”str: %@”,str);

I think i am not converting encoded string correctly to base64 data.
What am I missing?

Thank you
Mark

thank you dude!
You got me out of my illiteracy…

@ mark:
had the same problem, there’s a bug in the base 64 file.

Excellent work dude.
Thanks a lot.

Thanks for the Code.
When I use this code on iPhone for hello/hello the encoded string is not QA+Ul+r6Zmr7yHipMcHSbQ==
Can you please verify there is ssome problem with the Base64
Thanks,
locoVJ

Because this was so helpful…

There seems to be a bug in the base64 file. The line with inbuf[3] outbuf[4] should be inbuf[4] outbuf[3].

And you need to use the base64 stuff if you are working off the .NET example.. So something like

NSData * encdata = [NSData dataWithBase64DecodedString:the_encrypted64strfromweb];

NSData* decData = [crypto decrypt:encdata ….

————–

Oh, and just use a 16 character key right off the bat….

Thanks

Thanks for the code. It is very useful for me.
And I would also like to thanks bbb. Otherwise, I cannot still find a way to decrypt the base32 string.

Thank you so much for finding this! I was trying to figure this out over a year ago and eventually had to move on.

Just discovered this post while searching for iphone->.NET crypto interop. Did the base 64 bug get addressed?

Thanks!

you guys are chittah (jaguars) – kudos and many thanks!

by the way guys, I am looking for interoperability between .Net and iPhone for compression mechanism, currently I am trying gZip that available in both platforms, but luck is not my way,
strings which i compressed from both mechanism gives me different decompressed strings

many thanks
Jeet

I am not taking my words back… you guys are great, but I struck at ground I was testing both versions in and out.
I am encrypting a string in objective-c and also encrypting the same string in C# using AES and am seeing some strange issues. The first part of the result matches up to a certain point but then it is different. Why?

I am using a source string of “this is going to be test and fingers are crossed” Using a key of “1234567891123456″

The result from Objective C is 5U6TAlyma3GbR5UYqyk7d7mdTY1Jy9obUTwlOaL0/wn72s7IVZQPi1zydeonLSqP

The result from C# is
5U6TAlyma3GbR5UYqyk7d7mdTY1Jy9obUTwlOaL0/wn72s7IVZQPi1zydeonLSqPwifBaSjG51fj6y4S
j7cS7w==

you notice that initial portion of strings are same but then it starting differs.

I’ve not added/modified anything except for those string and key.
Please assist… I am in do/die situation

thanks
Jeet

Thanks for the code, it gives the clear idea for encrypting data on the iPhone and decrypting it using .Net.

YOU ARE THE MAN !!!!

saved me !

thanks everyone for fixing the Base64 Problem !!!!

Thanks. very nice code. it helps very much…

Just for info, you have a error in the md5data function :
old : NSString* temp = [NSString stringWithFormat:
@”02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X”,

New : NSString* temp = [NSString stringWithFormat:
@”%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X”,

(miss % on the beginning of the string)

But the code helpes me some, thank