AES加密在iOS上面的实现

Encryption.h文件
 
 
 
 
 
#import <Foundation/Foundation.h>
 
 
 
@class NSString;
 
 
 
@interface NSData (Encryption)
 
 
 
- (NSData *)AES256EncryptWithKey:(NSString *)key;   //加密
 
- (NSData *)AES256DecryptWithKey:(NSString *)key;   //解密
 
- (NSString *)newStringInBase64FromData;            //追加64编码
 
+ (NSString*)base64encode:(NSString*)str;           //同上64编码
 
 
 
@end
 
 
 
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Encryption.m文件
 
 
 
#import "Encryption.h"
 
#import <CommonCrypto/CommonCryptor.h>
 
 
 
 
 
static char base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 
 
 
@implementation NSData (Encryption)
 
 
 
- (NSData *)AES256EncryptWithKey:(NSString *)key   //加密
 
{
 
    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 dataWi