如何在 Cocoa/Objective-C 中将文件编码和解码为 Base64

问题描述

我目前正在尝试让一个小型肥皂客户端工作，其中包括在请求的 xml 中发送证书文件.

I am currently trying to get a small soap client to work, which includes to send a certificate file within the xml of the request.

我可以毫不费力地将文件转换为 NSData 对象 - 但是我必须将其转换为一些 Base64 字符串.环境是Mac OSX，Xcode 4.3.

I have no trouble getting the file into an NSData object - but then I have to convert it to some Base64 String. Environment is Mac OSX, Xcode 4.3.

我发现很多较早的帖子都在处理这个问题 - 但我发现最好的是一些使用 OpenSSL 库的代码，其中包含大量已弃用的方法.

I have found a lot of older posting dealing with that - but the best I found was some code that made use of OpenSSL libs and where containing loads of deprecated methods.

所以，我的问题如下:有没有比使用 OpenSSL 库更好的方法?如果有，您是否有一些 URL 或更新的代码片段?

So, my question is as follows: Is there a better way than to use the OpenSSL libs? If yes, do you perchance have some URL or more recent code scraps?

如果不是，我想有一些可以推荐的处理 Base64 的项目.毕竟 Base64 并不少见.

If no, I guess there is some project out there which deals with Base64 that can be recommended. After all Base64 is not that uncommon.

感谢您的帮助！

推荐答案

这是使用 CommonCrypto 完成的 base64 编码:

Here is a base64 encoding done with CommonCrypto:

很简单的代码，归类也不难

it is very easy code, it would not be difficult to put it in a category

如果您将其添加到您的项目中，您还需要添加 Security.framework

if you add this to your project you need also to add the Security.framework

#include <CoreFoundation/CoreFoundation.h>
#include <Security/Security.h>

static NSData *base64helper(NSData *input, SecTransformRef transform)
{
    NSData *output = nil;

    if (!transform)
        return nil;

    if (SecTransformSetAttribute(transform, kSecTransformInputAttributeName, input, NULL))
        output = (NSData *)SecTransformExecute(transform, NULL);

    CFRelease(transform);

    return [output autorelease];
}

NSString *base64enc(NSData *input)
{
    SecTransformRef transform = SecEncodeTransformCreate(kSecBase64Encoding, NULL);

    return [[[NSString alloc] initWithData:base64helper(input, transform) encoding:NSASCIIStringEncoding] autorelease];
}

NSData *base64dec(NSString *input)
{
    SecTransformRef transform = SecDecodeTransformCreate(kSecBase64Encoding, NULL);

    return base64helper([input dataUsingEncoding:NSASCIIStringEncoding], transform);
}

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