Appendix: OpenSSH private key format. Windows - convert a .pem file to a .ppk file. Convert a .ppk private key (Putty) to a base64/pem private key for OpenSSH or OpenSSL. Generate SSH Keys in PEM Format to Connect to a Public or On-Premises sFTP Server. 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. For detailed steps, see Convert your private key using PuTTYgen. 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. Converting PEM Keys to OpenSSH. Start PuTTYgen, and then convert the .pem file to a .ppk file. 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. 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.. I keep getting errors. Convert PPK key to OpenSSH format: puttygen ppk_key_id.ppk -O private-openssh -o openssh_rsa_id.key. OpenSSH deprecated use of DSA as it's not considered as secure as the other private key types provided like RSA, ECDSA, ED25519 etc. These are now output in OpenSSH's new key format which the BouncyCastle API does not recognise as its a custom format. ssh-keygen -f id_rsa -e -m pem This will convert your public key to an OpenSSL compatible format. Select your private key that ends in .ppk and then click Open. This means that the private key can be manipulated using the OpenSSL … Click Save, close the PuTTY Key Generator window and remember the location of the private key file for future use. You ... You must regenerate your keys in PEM format. When the header contains "BEGIN RSA PRIVATE KEY" then this is a RSA private key in the format described by PKCS#1. Your private key is already in PEM format and can be used as is (as Michael Hampton stated). Click Load. 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. 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. I'm having an issue generating a public key that the openssl PEM_read_bio_RSA_PUBKEY() function can consume. You are generating a DSA key. Start PuTTYgen. Traditionally OpenSSH has used the OpenSSL-compatible formats PKCS#1 (for RSA) and SEC1 (for EC) for Private keys. With puttygen on Linux/BSD/Unix-like. 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. Double check if AWS isn't asking for a (X.509) certificate in PEM format, which would be a different thing than your SSH … Windows - convert a .ppk file to a .pem file. If you are using the unix cli tool, run the following command: puttygen my.ppk -O private-openssh -o my.key. Previous; Table of contents; Next; Was this page helpful? Another option is to convert the ppk format to an OpenSSH format using the PuTTygen program performing the following steps: Run the puTTygen program. For Actions, choose Load, and then navigate to your .ppk file. You can convert your Putty private keys (.ppk) to base64 files for OpenSSH or OpenSSL. 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