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    <p>refer a following category.</p> <p>FAQ: What is a category? </p> <blockquote> <p>In short, Cocoa API to add the method. briefly expand class.</p> </blockquote> <p>More information,</p> <blockquote> <p><a href="https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/CustomizingExistingClasses/CustomizingExistingClasses.html#//apple_ref/doc/uid/TP40011210-CH6-SW2" rel="noreferrer">CustomizingExistingClasses</a></p> <p><a href="https://developer.apple.com/library/ios/documentation/General/Conceptual/DevPedia-CocoaCore/Category.html" rel="noreferrer">Category</a></p> </blockquote> <p>File-New-Cocoa Touch - Objective-C category</p> <p>If you want to use a category, your class add a #import"NSData+Encryption.h"</p> <p><img src="https://i.stack.imgur.com/IwRX3.png" alt="enter image description here"></p> <p><img src="https://i.stack.imgur.com/mLOVP.png" alt="enter image description here"></p> <p>//NSData+Encryption.h</p> <pre><code>@interface NSData (Encryption) - (NSData *)AES256EncryptWithKey:(NSString *)key; - (NSData *)AES256DecryptWithKey:(NSString *)key; @end </code></pre> <hr> <p>//NSData+Encryption.m</p> <pre><code>#import "NSData+Encryption.h" #import &lt;CommonCrypto/CommonCryptor.h&gt; @implementation NSData (Encryption) - (NSData *)AES256EncryptWithKey:(NSString *)key { // 'key' should be 32 bytes for AES256, will be null-padded otherwise char keyPtr[kCCKeySizeAES256+1]; // room for terminator (unused) bzero(keyPtr, sizeof(keyPtr)); // fill with zeroes (for padding) // fetch key data [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding]; NSUInteger dataLength = [self length]; //See the doc: For block ciphers, the output size will always be less than or //equal to the input size plus the size of one block. //That's why we need to add the size of one block here size_t bufferSize = dataLength + kCCBlockSizeAES128; void *buffer = malloc(bufferSize); size_t numBytesEncrypted = 0; CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding, keyPtr, kCCKeySizeAES256, NULL /* initialization vector (optional) */, [self bytes], dataLength, /* input */ buffer, bufferSize, /* output */ &amp;numBytesEncrypted); if (cryptStatus == kCCSuccess) { //the returned NSData takes ownership of the buffer and will free it on deallocation return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted]; } free(buffer); //free the buffer; return nil; } - (NSData *)AES256DecryptWithKey:(NSString *)key { // 'key' should be 32 bytes for AES256, will be null-padded otherwise char keyPtr[kCCKeySizeAES256+1]; // room for terminator (unused) bzero(keyPtr, sizeof(keyPtr)); // fill with zeroes (for padding) // fetch key data [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding]; NSUInteger dataLength = [self length]; //See the doc: For block ciphers, the output size will always be less than or //equal to the input size plus the size of one block. //That's why we need to add the size of one block here size_t bufferSize = dataLength + kCCBlockSizeAES128; void *buffer = malloc(bufferSize); size_t numBytesDecrypted = 0; CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding, keyPtr, kCCKeySizeAES256, NULL /* initialization vector (optional) */, [self bytes], dataLength, /* input */ buffer, bufferSize, /* output */ &amp;numBytesDecrypted); if (cryptStatus == kCCSuccess) { //the returned NSData takes ownership of the buffer and will free it on deallocation return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted]; } free(buffer); //free the buffer; return nil; } @end </code></pre>
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