如何將 RFC4716 私鑰轉換為 PEM 私鑰？

如何在 ubuntu 20.04 中將 RFC4716 私鑰轉換為 PEM 私鑰？

對於我們的項目，我們在執行最新 openssh 軟體的設備上生成了 ssh 密鑰。JSch 抱怨身份驗證：

異常 com.jcraft.jsch.JSchException：身份驗證失敗

經過大量研究，包括建構一個最小的 git 客戶端，我們發現我們的其他關鍵文件有一個小的變化。標題不是以

————開始 RSA 私鑰——

但它始於

—–開始 OPENSSH 私鑰—–

顯示，該密鑰被格式化為新的預設 RFC4716 格式。

我在這裡有同樣的問題，但我想使用我的原始密鑰而不是重新生成一個。而且我不想使用像 PuTTY 這樣的 GUI 應用程序。我想在腳本中轉換它。

我嘗試了幾次嘗試，但這些都不是：

ssh-keygen -f id_rsa -m 'PEM' -e
ssh-keygen -f id_rsa -e -m pem
# I got PUBLIC KEY instead of private key

openssl rsa -in ~/.ssh/id_rsa -outform pem
openssl rsa -in id_rsa -pubout -out id_rsa.pub.pem
openssl rsa -in ~/.ssh/id_rsaunable to load Private Key
# unable to load Private Key
# 139920849113728:error:0909006C:PEM routines:get_name:no start line:../crypto/pem/pem_lib.c:745:Expecting: ANY PRIVATE KEY

我該如何轉換它？

$ cat /tmp/test
-----BEGIN OPENSSH PRIVATE KEY-----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-----END OPENSSH PRIVATE KEY-----

$ ssh-keygen -p -f /tmp/test -m PEM
Key has comment 'jiri@t500'
Enter new passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved with the new passphrase.

$ cat /tmp/test
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----

引用自：https://unix.stackexchange.com/questions/638043