此方法采用kCCAlgorithmAES128，kCCOptionPKCS7Padding，kCCOptionECBMode，kCCBlockSizeAES128模式。如果另有其他模式需求加上即可！
废话不多说，直接上代码：
头文件：
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#import <Foundation/Foundation.h>
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#import <CommonCrypto/CommonCryptor.h>
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@class NSString;
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@interface NSData (Encryption)
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- (NSData *)AES256ParmEncryptWithKey:(NSString *)key;
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- (NSData *)AES256ParmDecryptWithKey:(NSString *)key;
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@end
.m实现文件：
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#import "Encryption.h"
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#import <CommonCrypto/CommonCryptor.h>
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@implementation NSData (Encryption)
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- (NSData *)AES256ParmEncryptWithKey:(NSString *)key
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{
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char keyPtr[kCCKeySizeAES256+1];
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bzero(keyPtr, sizeof(keyPtr));
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[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
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NSUInteger dataLength = [self length];
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size_t bufferSize = dataLength + kCCBlockSizeAES128;
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voidvoid *buffer = malloc(bufferSize);
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size_t numBytesEncrypted = 0;
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CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128,
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kCCOptionPKCS7Padding | kCCOptionECBMode,
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keyPtr, kCCBlockSizeAES128,
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NULL,
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[self bytes], dataLength,
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buffer, bufferSize,
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&numBytesEncrypted);
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if (cryptStatus == kCCSuccess) {
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return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
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}
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free(buffer);
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return nil;
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}
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- (NSData *)AES256ParmDecryptWithKey:(NSString *)key
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{
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char keyPtr[kCCKeySizeAES256+1];
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bzero(keyPtr, sizeof(keyPtr));
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[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
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NSUInteger dataLength = [self length];
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size_t bufferSize = dataLength + kCCBlockSizeAES128;
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voidvoid *buffer = malloc(bufferSize);
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size_t numBytesDecrypted = 0;
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CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmAES128,
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kCCOptionPKCS7Padding | kCCOptionECBMode,
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keyPtr, kCCBlockSizeAES128,
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NULL,
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[self bytes], dataLength,
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buffer, bufferSize,
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&numBytesDecrypted);
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if (cryptStatus == kCCSuccess) {
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return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];
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}
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free(buffer);
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return nil;
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}
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iOS系统方法进行AES对称加密
原文：http://blog.csdn.net/sinat_28709097/article/details/46872943
