話不多說，直接上程式碼

.h

import <Foundation/Foundation.h>

@interface LanAES : NSObject

+(NSData *)AES256ParmEncryptWithKey:(NSString *)key Encrypttext:(NSData *)text;   //加密

+(NSData *)AES256ParmDecryptWithKey:(NSString *)key Decrypttext:(NSData *)text;   //解密

+(NSString *) aes256_encrypt:(NSString *)key Encrypttext:(NSString

+(NSString *) aes256_decrypt:(NSString *)key Decrypttext:(NSString *)text;

@end

.m

#import "LanAES.h"

#import <CommonCrypto/CommonCryptor.h>

@implementation LanAES

+(NSData *)AES256ParmEncryptWithKey:(NSString *)key Encrypttext:(NSData *)text  //加密

{

char keyPtr[kCCKeySizeAES256+

    bzero(keyPtr, sizeof(keyPtr));

    [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];

    NSUInteger dataLength = [text length];

    size_t bufferSize = dataLength + kCCBlockSizeAES128;

    void *buffer = malloc(bufferSize);

    size_t numBytesEncrypted = 0

CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128,

                                          kCCOptionPKCS7Padding | kCCOptionECBMode,

                                          keyPtr, kCCBlockSizeAES128,

                                          NULL,

                                          [text bytes], dataLength,

                                          buffer, bufferSize,

                                          &numBytesEncrypted);

    if (cryptStatus == kCCSuccess) {

        return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];

    }

    free(buffer);

return nil;

}

+ (NSData *)AES256ParmDecryptWithKey:(NSString *)key Decrypttext:(NSData *)text  //解密

{

char keyPtr[kCCKeySizeAES256+1];

    bzero(keyPtr, sizeof(keyPtr));

    [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];

    NSUInteger dataLength = [text length];

    size_t bufferSize = dataLength + kCCBlockSizeAES128;

    void *buffer = malloc(bufferSize);

    size_t numBytesDecrypted = 0;

CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmAES128,

                                          kCCOptionPKCS7Padding | kCCOptionECBMode,

                                          keyPtr, kCCBlockSizeAES128,

                                          NULL,

                                          [text bytes], dataLength,

                                          buffer, bufferSize,

                                          &numBytesDecrypted);

    if (cryptStatus == kCCSuccess) {

        return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];

    }

    free(buffer);

return nil;

}

+(NSString *) aes256_encrypt:(NSString *)key Encrypttext:(NSString *)text

{

constchar *cstr = [text cStringUsingEncoding:NSUTF8StringEncoding];

    NSData *data = [NSData dataWithBytes:cstr length:text.length];

//對資料進行加密

NSData *result = [LanAESAES256ParmEncryptWithKey:key Encrypttext:data];

//轉換為2進位制字串

    if (result && result.length > 0) {

        Byte *datas = (Byte*)[result bytes];

NSMutableString *output = [NSMutableStringstringWithCapacity:result.length * 2];

        for(int i = 0; i < result.length; i++){

            [output appendFormat:@"%02x", datas[i]];

        }

        return output;

    }

return nil;

}

+(NSString *) aes256_decrypt:(NSString *)key Decrypttext:(NSString *)text

{

//轉換為2進位制Data

NSMutableData *data = [NSMutableDatadataWithCapacity:text.length / 2];

    unsigned char whole_byte;

    char byte_chars[3] = {'\0','\0','\0'};

    int i;

    for (i=0; i < [text length] / 2; i++) {

        byte_chars[0] = [text characterAtIndex:i*2];

        byte_chars[1] = [text characterAtIndex:i*2+1];

        whole_byte = strtol(byte_chars, NULL, 16);

        [data appendBytes:&whole_byte length:1];

    }

//對資料進行解密

NSData* result = [LanAESAES256ParmDecryptWithKey:key Decrypttext:data];

    if (result && result.length > 0) {

return [[NSStringalloc] initWithData:result encoding:NSUTF8StringEncoding];

    }

return nil;

}

結果測試