iOS 加密解密

1.加密

- (NSString*)base64String:(NSString*)sourceString

{//判断字符串的长度是否小于等于0如果是，就返回空

    if(sourceString.length<=0) {

        returnnil;

    }

    //把字符串转化为二进制流

    NSData * sourceData = [[NSData alloc] initWithData:[sourceString dataUsingEncoding:NSUTF8StringEncoding]];

    NSString * baseString = [sourceData base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithLineFeed];

    returnbaseString;

}

2.解密

- (NSString*)encodeBase64String:(NSString*)baseString

{

    if(baseString.length<=0) {

        return  nil;

    }

    NSData * data = [[NSData alloc] initWithBase64EncodedString:baseString options:NSDataBase64DecodingIgnoreUnknownCharacters];

    return [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

}