通过.pub格式的公共密钥创建JSch HostKey实例 [英] Creating JSch HostKey instance from a public key in .pub format

问题描述

我正在尝试使用JSch将文件从Windows机器发送到Linux机器.因此，我将主机公共密钥从Linux计算机复制到了Windows计算机，并将密钥添加到了我的HostKeyRepository.但是由于某种原因，我得到了无效的密钥类型"异常.这是我的代码:

I am trying to send a file from a Windows machine to a Linux machine using JSch. Because of that I copied the host public key from the Linux machine to my Windows machine and added the key to my HostKeyRepository. But for some reason I get "invalid key type" exception. Here is my code:

HostKeyRepository repo = jsch.getHostKeyRepository();
File file = new File("D:\\Uni\\Arbeit\\ssh_host_rsa_key.pub");
byte[] HK = Files.readAllBytes(file.toPath());
Session session=jsch.getSession(user, host, 22);
session.setPassword(password);  
HostKey hk = new HostKey(null, HK); 
repo.add(hk, null);
session.connect();

推荐答案

.pub文件的格式为:

<type> <base64-encoded-public-key> <comment>

What goes to the HostKey constructor is the public key part only, in a binary form (not base64-encoded).

使用JSch Util.fromBase64()将base64-encoded-public-key部分转换为byte[].

Use the JSch Util.fromBase64() to convert the base64-encoded-public-key part to byte[].

static byte[] fromBase64(byte[] buf, int start, int length) 

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您还可以在KnownHosts.setKnownHosts(InputStream input)中检查known_hosts文件解析的JSch实现.

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You can also check the JSch implementation of the known_hosts file parsing in the KnownHosts.setKnownHosts(InputStream input).

known_hosts文件的格式与.pub文件类似，不同之处在于，前面有一个额外的hostname部分，通常不包括comment:

The known_hosts file has a similar format as the .pub file, except that there's an additional hostname part in the front and the comment is usually not included:

<hostname> <type> <base64-encoded-public-key> [comment]

请注意，如果您知道要解析文件的一种特定格式，则实现不必如此复杂.

Note that your implementation does not have to be that complex as theirs, if you know that you are going to parse one specific format of the file.

因此，将File中的行读取为字符串，删除<type>和<comment>并使用此表达式(取自KnownHosts.setKnownHosts，键为<base64-encoded-public-key>部分):

So read the line from File to string, remove the <type> and <comment> and use this expression (taken from KnownHosts.setKnownHosts, the key is the <base64-encoded-public-key> part):

Util.fromBase64(Util.str2byte(key), 0, key.length())

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