If you are using the unix cli tool, run the following command: puttygen my.ppk -O private-openssh -o my.key. If it were an RSA key pair, there would be no need for that as an RSA id_rsa key is already in a PEM file format but the ED25519 key pair is an OpenSSH format. Whereas the OpenSSH public key format is effectively “proprietary” (that is, the format is used only by OpenSSH), the private key is already stored as a PKCS#1 private key. Another option is to convert the ppk format to an OpenSSH format using the PuTTygen program performing the following steps: Run the puTTygen program. In this post, part of our “how to manage SSL certificates on Windows and Linux systems” series, we’ll show how to convert an SSL certificate into the most common formats defined on X.509 standards: the PEM format and the PKCS#12 format, also known as PFX.The conversion process will be accomplished through the use of OpenSSL, a free tool available for Linux and Windows platforms. Click Load. For detailed steps, see Convert your private key using PuTTYgen. Generate SSH Keys in PEM Format to Connect to a Public or On-Premises sFTP Server. For Actions, choose Load, and then navigate to your .ppk file. ssh-keygen -f id_rsa -e -m pem This will convert your public key to an OpenSSL compatible format. Your private key is already in PEM format and can be used as is (as Michael Hampton stated). Obviously I cannot simply use the ASCII string in the ssh-keygen <>.pub key file as it is in SSH file format or I perhaps SubjectPublicKeyInfo structure.. Traditionally OpenSSH has used the OpenSSL-compatible formats PKCS#1 (for RSA) and SEC1 (for EC) for Private keys. When the header says "BEGIN PRIVATE KEY" (without the "RSA") then it uses PKCS#8, a wrapper format that includes the designation of the key type ("RSA") and the private key itself. Say you have a private key in PEM format, and you want to use that key for SSH into another server, by adding an entry to your ~/.ssh/authorized_keys file with the public key of such PEM file. With puttygen on Linux/BSD/Unix-like. Windows - convert a .ppk file to a .pem file. Previous; Table of contents; Next; Was this page helpful? These are now output in OpenSSH's new key format which the BouncyCastle API does not recognise as its a custom format. Double check if AWS isn't asking for a (X.509) certificate in PEM format, which would be a different thing than your SSH … Convert a .ppk private key (Putty) to a base64/pem private key for OpenSSH or OpenSSL. Windows - convert a .pem file to a .ppk file. You are generating a DSA key. You ... You must regenerate your keys in PEM format. -----end openssh private key----- I would like to convert it to a PEM file format. Converting PEM Keys to OpenSSH. Convert PPK key to OpenSSH format: puttygen ppk_key_id.ppk -O private-openssh -o openssh_rsa_id.key. If you need to convert your private and/or public key to an OpenSSH key, you can use PuTTYgen on: Linux: Run these commands as the root user or via sudo: Install: apt install putty-tools. This means that the private key can be manipulated using the OpenSSL … Start PuTTYgen. You can convert your Putty private keys (.ppk) to base64 files for OpenSSH or OpenSSL. Select your private key that ends in .ppk and then click Open. Choose the .ppk file, and then choose Open. Start PuTTYgen, and then convert the .pem file to a .ppk file. OpenSSH deprecated use of DSA as it's not considered as secure as the other private key types provided like RSA, ECDSA, ED25519 etc. I keep getting errors. Appendix: OpenSSH private key format. Copy-----BEGIN OPENSSH PRIVATE KEY-----Use -m PEM with ssh-keygen to generate private keys in PEM format: Copy ssh-keygen -t rsa -m PEM. 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