有关AES加密的问题

 private static final String AES_OPTIONS = "AES/ECB/PKCS5Padding";
        private final static String CHARSET = "utf-8";

        public static String encryptAES(String plain, String key) {
            try {
                Cipher cipher = Cipher.getInstance(AES_OPTIONS);
                cipher.init(Cipher.ENCRYPT_MODE,
                        new SecretKeySpec(key.getBytes(CHARSET), "AES"));
                return Base64.encodeToString(
                        cipher.doFinal(plain.getBytes(CHARSET)), Base64.DEFAULT);
            } catch (Exception e) {
                e.printStackTrace();
                return null;
            }
        }

//将string转成带密码的data
+ (NSString*)encryptAESData:(NSString*)string app_key:(NSString*)key ;

#pragma mark - AES加密
//将string转成带密码的data
+(NSString*)encryptAESData:(NSString*)string app_key:(NSString*)key
{
    //将nsstring转化为nsdata
    NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
    //使用密码对nsdata进行加密
    NSData *encryptedData = [data AES128EncryptWithKey:key];
    NSLog(@"加密后的字符串 :%@",[encryptedData base64EncodedString]);
    
    return [encryptedData base64EncodedString];
}

#import "NSData+AES.h"

#import <CommonCrypto/CommonCryptor.h>

#define gIv          @"AES" //可以自行修改

-(NSData *)AES128EncryptWithKey:(NSString *)key {//加密
    char keyPtr[kCCKeySizeAES128+1];
    bzero(keyPtr, sizeof(keyPtr));
    [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
    
    char ivPtr[kCCKeySizeAES128+1];
    memset(ivPtr, 0, sizeof(ivPtr));
    [gIv getCString:ivPtr maxLength:sizeof(ivPtr) 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,
                                          ivPtr,
                                          [self bytes],
                                          dataLength,
                                          buffer,
                                          bufferSize,
                                          &numBytesEncrypted);
    if (cryptStatus == kCCSuccess) {
        return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
    }
    free(buffer);
    return nil;
}