algorithm name (one of (ssh-rsa, ssh-dsa)).The length is encoded as four octets (in big-endian order).
#OPENSSH PRIVATE KEY SERIES#
What, you may ask, is PEM encoding? Privacy Enhanced Mail (PEM) is a specific type of Base64 encoding…which is to say it is a way of representing binary data using only printable ASCII characters.įor an ssh-rsa key, the PEM-encoded data is a series of (length, data) pairs. Briefly, an OpenSSH public key consists of three fields: The OpenSSH public key format is fully documented RFC 4253.
![openssh private key openssh private key](https://tech.meetrp.com/blog/wp-content/uploads/2013/12/06-putty-setting.png)
If you have a recent version of OpenSSH (where recent means 5.6 or later), you can just do this: ssh-keygen -f key.pub -e -m pem QSYlFuShWrHPtiLmUdPoP6CV2mML1tk+l7DIIqXrQhLUKDACeM5roMx0kLhUWB8P MwSXA9VNmhz+PiB+Dml4WWnKW/VHo2ujTXxq7+efMU4H2fn圓Se3KYOsFPFGZ1TN +xTBtWdEo7XGUujKDvC2/aZKukfjpOiUI8AhLAfjmlcD/UZ1QPh0mHsglRNCmpCw MIIBCgKCAQEA+xGZ/wcz9ugFpP07Nspo6U17l0YhFiFpxxU4pTk3Lifz9R3zsIsuĮRwta7+fWIfxOo208ett/jhskiVodSEt3QBGh4XBipyWopKwZ93HHaDVZAALi/2A JiUW5KFasc+2IuZR0+g/oJXaYwvW2T6XsMgipetCEtQoMAJ4zmugzHSQuFRYHw/7S6PUI2UĠ3glFmULvEV+qIxsVFT1ng3pj this: -BEGIN RSA PUBLIC KEY. HFTilOTcuJ/P1HfOwiy4RHC1rv59Yh/E6jbT圆23+OGySJWh1IS3dAEaHhcGKnJaikrBn3cĬdoNVkAAuL/YD7FMG1Z0SjtcZS6MoO8Lb9pkq6R+Ok6JQjwCEsB+OaVwP9RnVA+HSYe圜VEĠKakLCbBJcD1U2aHP4+IH4OaXhZacpb9Ueja6NNfGrv558xTgfZ+fLdJ7cpg6wU8UZnVM1B That is, I wanted to go from this: ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQD7EZn/BzP26AWk/Ts2ymjpTXuXRiEWIWn
![openssh private key openssh private key](https://blog.anurut.com/content/images/2020/11/1-1.png)
![openssh private key openssh private key](https://www.simplified.guide/_media/putty/puttygen-generate-public-key/puttygen-download.png)
I’ve posted a followup to this article that discusses ssh-agent.įor reasons best left to another post, I wanted to convert an SSH public key into a PKCS#1 PEM-encoded public key.