Upsource doesn't work with PuTTY-format private keys, so you would need to convert it to OpenSSH format. The keys it generates have -----BEGIN RSA PUBLIC KEY----- at the start (and then the key … PuTTYgen will display a window to load your key. RFC 4716 SSH Public Key File Format November 2006 1.Introduction The SSH protocol supports the use of public/private key pairs in order to perform authentication based on public key cryptography. Convert a Private Key to the OpenSSH Key Format During implementations of the SFTP listener, you may be prompted to accept a public key from a SFTP server. Here -e ==> SSH to read an OpenSSH key file and convert it to SSH2 format Note: If you need passwordless authentication b/w two different hosts , you need to convert the publickey as per the destination server SSH version and append the public key to ~/.ssh/authorized_keys or ~/.ssh2/authorized_keys at destination server. OpenSSL to OpenSSH. Another option is to convert the ppk format to an OpenSSH format using the PuTTygen program performing the following steps: Run the puTTygen program. I need to send a public key to my bank. Each format is illustrated below. 4. Launch the utility and click Conversions > Import key. With puttygen on Linux/BSD/Unix-like. It says that it generates "OpenSSH compatible certificates [sic]" when you press the generate keys button. Select the location and file name for your OpenSSH private key and click on the save button. You will be prompted to download your new OpenSSH key immediately. Click Save, close the PuTTY Key Generator window and remember the location of the private key file for future use. Save the new OpenSSH key when prompted. Paste your commercial SSH key below and hit the Convert button. ssh2.pub). For a number of our services, we ask you to provide a private SSH key. Select your private key that ends in .ppk and click Open. Your SSH private key may be in the Users\[user_name]\.ssh directory. You can convert your key to OpenSSH format: Oddly, I haven't found an option in OpenSSH to convert that key to its format, even though it will let you use it in SSHv1 compatibility mode. Click Load. Open 'puttygen' and generate a 2048 bit rsa public/private key pair. To use a SSH2 public key with gogs one has to convert it to the OpenSSH format first i.e. Make sure you add a password after it is generated. Choose the .ppk file, and then choose Open. This tutorial will not convert on how to generate a pair of public and private keys. For PuTTY users, this can cause an issue as we do not use the PuTTY-keygen format. You may need to manually insert line-breaks at the appropriate places. There's an old and new types of SSH key file format and will be automatically be determined based on the key's type except if you choose Export OpenSSH key (force new file format). Start PuTTYgen, and then convert the .pem file to a .ppk file. First, you need to download this utility called PuTTYgen. PuTTYgen is an key generator for creating SSH keys for PuTTY. Your private key is already in PEM format and can be used as is (as Michael Hampton stated). However, it will import SSHv2 keys from the commercial SSH2 implemenation (the keys created above). Click Load. Another option is to convert the ppk format to an OpenSSH format using the PuTTygen program: Run the puTTygen program. Windows - convert a .pem file to a .ppk file. 2. To do that, please perform the following steps: Click Export OpenSSH key. I'm having an issue generating a public key that the openssl PEM_read_bio_RSA_PUBKEY() function can consume. Convert multi-line ssh public key to one-line for .ssh/authorized_keys. Save the public key as "puttystyle.pub" and save the private key as "puttystyle". Select your private key that ends in .ppk and then click Open. For detailed steps, see Convert your private key using PuTTYgen. Save the SSH2 public key to a file (e.g. (Optional) Convert ppk format to OpenSSH. Traditionally OpenSSH has used the OpenSSL-compatible formats PKCS#1 (for RSA) and SEC1 (for EC) for Private keys. In this scenario, you must ensure that the private key file being specified for the SFTP listener is generated using OpenSSH key format. You will need to open the file in a text editor and copy each certificate and private key (including the BEGIN/END statements) to its own individual text file and save them as certificate.cer, CACert.cer, and privateKey.key respectively. I keep getting errors. $ ssh-keygen -e -f ~/.ssh/id_dsa.pub > ~/.ssh/id_dsa_ssh2.pub Serv-U uses OpenSSH style keys only, and does not support PuTTY. 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