本文轉載至?http://blog.csdn.net/zaitianaoxiang/article/details/6650478

• 原文鏈接?:?http://www.yifeiyang.net/iphone-development-techniques-of-data-papers-2-iphone-encryption-program/
• CCCryptbase64encoding

  iPhone開發技巧之數據篇（2）—iPhone程序中的加密處理

  CCCrypt

  在Objective-C語言中，加密時常用到CCCrypt(3cc)Mac OS X Manual Page。下面的代碼使用 CCCrypt() ，給 NSData 類增加了AES256EncryptWithKey, AES256DecryptWithKey 方法.

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  #import <CommonCrypto/CommonCryptor.h>@implementation NSData (Additions)@class NSString;- (NSData *)AES256EncryptWithKey:(NSString *)key {char keyPtr[kCCKeySizeAES256+1];bzero(keyPtr, sizeof(keyPtr));[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;CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128,kCCOptionPKCS7Padding | kCCOptionECBMode,keyPtr, kCCBlockSizeAES128,NULL,[self bytes], dataLength,buffer, bufferSize,&numBytesEncrypted);if (cryptStatus == kCCSuccess) {return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];}free(buffer);return nil;}- (NSData *)AES256DecryptWithKey:(NSString *)key {char keyPtr[kCCKeySizeAES256+1];bzero(keyPtr, sizeof(keyPtr));[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 | kCCOptionECBMode,keyPtr, kCCBlockSizeAES128,NULL,[self bytes], dataLength,buffer, bufferSize,&numBytesDecrypted);if (cryptStatus == kCCSuccess) {return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];}free(buffer);return nil;}@end

  ?

  使用的時候就像使用NSData一樣。

  base64encoding

  有的時候需要向服務器上傳遞base64加密的數據，這個時候我們就可以像下面，給 NSData類追加newStringInBase64FromData 方法。

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  - (NSString *)newStringInBase64FromData {NSMutableString *dest = [[NSMutableString alloc] initWithString:@""];unsigned char * working = (unsigned char *)[self bytes];int srcLen = [self length];for (int i=0; i<srcLen; i += 3) {for (int nib=0; nib<4; nib++) {int byt = (nib == 0)?0:nib-1;int ix = (nib+1)*2;if (i+byt >= srcLen) break;unsigned char curr = ((working[i+byt] << (8-ix)) & 0x3F);if (i+nib < srcLen) curr |= ((working[i+nib] >> ix) & 0x3F);[dest appendFormat:@"%c", base64[curr]];}}return dest;}

  ?

  同樣，使用的時候就像使用NSData一樣。

  ---

  最終的代碼如下所示 ：

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  //// NSDataAdditions.h//// Copyright 2010 __MyCompanyName__. All rights reserved.//#import <Foundation/Foundation.h>@class NSString;@interface NSData (Additions)- (NSData *)AES256EncryptWithKey:(NSString *)key;- (NSData *)AES256DecryptWithKey:(NSString *)key;- (NSString *)newStringInBase64FromData;@end// -----------------------------------------------------------------------------------//// NSDataAdditions.m//// Copyright 2010 __MyCompanyName__. All rights reserved.//#import "NSDataAdditions.h" #import <CommonCrypto/CommonCryptor.h>static char base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";@implementation NSData (Additions)@class NSString;- (NSData *)AES256EncryptWithKey:(NSString *)key {char keyPtr[kCCKeySizeAES256+1];bzero(keyPtr, sizeof(keyPtr));[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;CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128,kCCOptionPKCS7Padding | kCCOptionECBMode,keyPtr, kCCBlockSizeAES128,NULL,[self bytes], dataLength,buffer, bufferSize,&numBytesEncrypted);if (cryptStatus == kCCSuccess) {return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];}free(buffer);return nil;}- (NSData *)AES256DecryptWithKey:(NSString *)key {char keyPtr[kCCKeySizeAES256+1];bzero(keyPtr, sizeof(keyPtr));[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 | kCCOptionECBMode,keyPtr, kCCBlockSizeAES128,NULL,[self bytes], dataLength,buffer, bufferSize,&numBytesDecrypted);if (cryptStatus == kCCSuccess) {return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];}free(buffer);return nil;}- (NSString *)newStringInBase64FromData {NSMutableString *dest = [[NSMutableString alloc] initWithString:@""];unsigned char * working = (unsigned char *)[self bytes];int srcLen = [self length];for (int i=0; i<srcLen; i += 3) {for (int nib=0; nib<4; nib++) {int byt = (nib == 0)?0:nib-1;int ix = (nib+1)*2;if (i+byt >= srcLen) break;unsigned char curr = ((working[i+byt] << (8-ix)) & 0x3F);if (i+nib < srcLen) curr |= ((working[i+nib] >> ix) & 0x3F);[dest appendFormat:@"%c", base64[curr]];}}return dest;}@end

轉載于:https://www.cnblogs.com/Camier-myNiuer/p/3601807.html

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