How to convert SSH keypairs generated using PuTTYgen (Windows) into key-pairs used by ssh-agent and Keychain (Linux)

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puttygen supports exporting your private key to an OpenSSH compatible format. You can then use OpenSSH tools to recreate the public key.

  1. Open PuttyGen
  2. Click Load
  3. Load your private key
  4. Go to Conversions->Export OpenSSH and export your private key
  5. Copy your private key to ~/.ssh/id_dsa (or id_rsa).

  6. Create the RFC 4716 version of the public key using ssh-keygen

    ssh-keygen -e -f ~/.ssh/id_dsa > ~/.ssh/id_dsa_com.pub

  7. Convert the RFC 4716 version of the public key to the OpenSSH format:

    ssh-keygen -i -f ~/.ssh/id_dsa_com.pub > ~/.ssh/id_dsa.pub

See this and this for more information.

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