iOS 5：数据encryptionAES-256 EncryptWithKey：未find

问题是关于iOS5应用程序。 我有一个视图控制器，我有一些UITextFields。 我想用AES-256encryption数据。

实际上，我不知道我必须添加哪些先决条件包来进行encryption和解密。 我已经去了其他职位，但太多的解释搞砸了。

请让我知道什么和所有包，头文件，我必须包括使用AES-256encryption数据

钱德拉

Answer 1

请参考以下类别。

常见问题：什么是类别？

总之，cocoaAPI添加方法。 简单地扩展类。

更多信息，

CustomizingExistingClasses

类别

File-New-Cocoa Touch – Objective-C类别

如果你想使用一个类别，你的类添加#import“NSData + Encryption.h”

//NSData+Encryption.h

@interface NSData (Encryption) - (NSData *)AES256EncryptWithKey:(NSString *)key; - (NSData *)AES256DecryptWithKey:(NSString *)key; @end 

---

//NSData+Encryption.m

 #import "NSData+Encryption.h" #import <CommonCrypto/CommonCryptor.h> @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 */ &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 */ &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