jenkins.plugins.publish_over.BapPublisherException: Failed to add SSH key

jenkins无密码ssh时报错:jenkins.plugins.publish_over.BapPublisherException: Failed to add SSH key. Message [invalid privatekey: [B@6a581993]
com.jcraft.jsch.JSchException: invalid privatekey, 部分库（如：JSch）不支持OPENSSH PRIVATE KEY格式的私钥

1、jenkins使用 ssh-keygen -m PEM -t rsa -b 4096 来生成key就可以用了。
-m 参数指定密钥的格式，PEM（也就是RSA格式）是之前使用的旧格式
2、如果ssh-keygen -t rsa 默认产生的key 2048位
需要用puttygen.exe导出为openssl格式

3、放到/data/1jenkins2048
chown jenkins.jenkins 1jenkins2048
4、id_rsa.pub放到远端的authorized_keys文件里面

5、openssl rsa -in 1jenkins2048 -noout -text
Enter pass phrase for 1jenkins2048:
RSA Private-Key: (2048 bit, 2 primes)

6、假设有OPENSSH PRIVATE KEY格式文件：demo.private
load文件：puttygen demo.private
导出为RSA PRIVATE KEY格式：Conversions -> Export OpenSSH key

转换为ppk格式：
`puttygen tempkey -o tempkey.ppk`

转换回openssh格式：
`puttygen tempkey.ppk -O private-openssh -o tempkey.oldformat`

7、# generate ssh.com private key from private openssh key
$ puttygen newkey -O private-sshcom -o newkey.puttygen-sshcom

# generate ssh.com public key from private openssh key
$ puttygen newkey -O public -o newkey.pub_puttygen-sshcom

# generate openssh public key from private openssh key (for confirmation)
$ puttygen newkey -O public-openssh -o newkey.pub_puttygen-openssh

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