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    <p>A friend of mine and me created an iOS and Android app which can crypt messages. To use it, you should create an extension of NSData with following code Snippet <a href="https://github.com/hohl/sourcedrop-osx/blob/master/SourceDrop/NSData+AES256.m" rel="nofollow">from this website</a>:</p> <pre><code>- (NSData *)AES128EncryptWithKey:(NSString *)key { // 'key' should be 32 bytes for AES256, // 16 bytes for AES256, will be null-padded otherwise char keyPtr[kCCKeySizeAES128 + [key length]]; // room for terminator (unused) bzero(keyPtr, sizeof(keyPtr)); // fill with zeroes (for padding) // insert key in char array [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding]; NSUInteger dataLength = [self length]; size_t bufferSize = dataLength + kCCBlockSizeAES128; void *buffer = malloc(bufferSize); size_t numBytesEncrypted = 0; // the encryption method, use always same attributes in android and iPhone (f.e. PKCS7Padding) CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding, keyPtr, kCCKeySizeAES128, NULL /* initialization vector (optional) */, [self bytes], dataLength, /* input */ buffer, bufferSize, /* output */ &amp;numBytesEncrypted); if (cryptStatus == kCCSuccess) { return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted]; } free(buffer); return nil; } - (NSData *)AES128DecryptWithKey:(NSString *)key { // 'key' should be 32 bytes for AES256, will be null-padded otherwise char keyPtr[kCCKeySizeAES128 + [key length]]; // room for terminator (unused) bzero(keyPtr, sizeof(keyPtr)); // fill with zeroes (for padding) // insert key in char array [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding]; NSUInteger dataLength = [self length]; size_t bufferSize = dataLength + kCCBlockSizeAES128; void *buffer = malloc(bufferSize); size_t numBytesDecrypted = 0; CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding, keyPtr, kCCKeySizeAES128, NULL /* initialization vector (optional) */, [self bytes], dataLength, /* input */ buffer, bufferSize, /* output */ &amp;numBytesDecrypted); if (cryptStatus == kCCSuccess) { return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted]; } free(buffer); return nil; } + (NSData *)base64DataFromString: (NSString *)string { unsigned long ixtext, lentext; unsigned char ch, inbuf[4], outbuf[3]; short i, ixinbuf; Boolean flignore, flendtext = false; const unsigned char *tempcstring; NSMutableData *theData; if (string == nil){ return [NSData data]; } ixtext = 0; tempcstring = (const unsigned char *)[string UTF8String]; lentext = [string length]; theData = [NSMutableData dataWithCapacity: lentext]; ixinbuf = 0; while (true){ if (ixtext &gt;= lentext){ break; } ch = tempcstring [ixtext++]; flignore = false; if ((ch &gt;= 'A') &amp;&amp; (ch &lt;= 'Z')){ ch = ch - 'A'; } else if ((ch &gt;= 'a') &amp;&amp; (ch &lt;= 'z')){ ch = ch - 'a' + 26; } else if ((ch &gt;= '0') &amp;&amp; (ch &lt;= '9')){ ch = ch - '0' + 52; } else if (ch == '+'){ ch = 62; } else if (ch == '=') { flendtext = true; } else if (ch == '/') { ch = 63; } else { flignore = true; } if (!flignore){ short ctcharsinbuf = 3; Boolean flbreak = false; if (flendtext){ if (ixinbuf == 0){ break; } if ((ixinbuf == 1) || (ixinbuf == 2)) { ctcharsinbuf = 1; } else { ctcharsinbuf = 2; } ixinbuf = 3; flbreak = true; } inbuf [ixinbuf++] = ch; if (ixinbuf == 4){ ixinbuf = 0; outbuf[0] = (inbuf[0] &lt;&lt; 2) | ((inbuf[1] &amp; 0x30) &gt;&gt; 4); outbuf[1] = ((inbuf[1] &amp; 0x0F) &lt;&lt; 4) | ((inbuf[2] &amp; 0x3C) &gt;&gt; 2); outbuf[2] = ((inbuf[2] &amp; 0x03) &lt;&lt; 6) | (inbuf[3] &amp; 0x3F); for (i = 0; i &lt; ctcharsinbuf; i++) { [theData appendBytes: &amp;outbuf[i] length: 1]; } } if (flbreak) { break; } } } return theData; } </code></pre> <p>Then inside the class you want to use the crypt methods insert at the top:</p> <pre><code>#import "NSData+Crypt.h" </code></pre> <p>And than encrypt your strings like that:</p> <pre><code> NSData *value = [aString dataUsingEncoding:NSUTF8StringEncoding]; NSData *encryptedData = [value AES128EncryptWithKey:myKey]; NSString *myString = [encryptedData base64Encoding]; </code></pre> <p>And decrypt the data like this:</p> <pre><code>NSData *myData = [NSData base64DataFromString:_textView.text]; NSData *decryptedData = [myData AES128DecryptWithKey:_textField.text]; NSString *myString2 = [[NSString alloc] initWithData:decryptedData encoding:NSUTF8StringEncoding]; </code></pre> <p>I used the method <code>base64DataFromString</code> from the <a href="http://www.cocoawithlove.com/2009/06/base64-encoding-options-on-mac-and.html" rel="nofollow">website of Matt Gallagher</a> otherwise if you use </p> <pre><code>[[NSData alloc] base64EncodedDataWithOptions:NSUTF8StringEncoding]; </code></pre> <p>the method is just available on >= iOS 7.0</p>
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    1. POAES gets different results in iOS (Obj-C) and Android (Java)
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    1. COI fixed the problem for longer keys than 16 characters.
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