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