(Ruby) Generate RSA SSH Key

See more SSH Key Examples

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

key = Chilkat::CkSshKey.new()

# numBits may range from 384 to 4096.  Typical values are
# 1024 or 2048.  (must be a multiple of 64)
# A good choice for the exponent is 65537.  Chilkat recommends
# always using this value.
numBits = 2048
exponent = 65537
success = key.GenerateRsaKey(numBits,exponent)
if (success != true)
    print "Bad params passed to RSA key generation method." + "\n";
    exit
end

# Note: Generating a public/private key pair is CPU intensive
# and may take a short amount of time (more than few seconds,
# but less than a minute).

# Export the RSA private key to OpenSSH, PuTTY, and XML and save. 
exportEncrypted = false
exportedKey = key.toOpenSshPrivateKey(exportEncrypted)
# Chilkat provides a SaveText method for convenience...
success = key.SaveText(exportedKey,"privkey_openssh_unencrypted.pem")

# Export with encryption to OpenSSH private key format:
key.put_Password("secret")
exportEncrypted = true
exportedKey = key.toOpenSshPrivateKey(exportEncrypted)
success = key.SaveText(exportedKey,"privkey_openssh_encrypted.pem")

# Export the RSA private key to unencrypted PuTTY format:
exportEncrypted = false
exportedKey = key.toPuttyPrivateKey(exportEncrypted)
success = key.SaveText(exportedKey,"privkey_putty_unencrypted.ppk")

# Export the RSA private key to encrypted PuTTY format:
key.put_Password("secret")
exportEncrypted = true
exportedKey = key.toPuttyPrivateKey(exportEncrypted)
success = key.SaveText(exportedKey,"privkey_putty_encrypted.ppk")

# Export private key to XML:
exportedKey = key.toXml()
success = key.SaveText(exportedKey,"privkey.xml")

# ----------------------------------------------------
# Now for the public key....
# ----------------------------------------------------

# The Secure Shell (SSH) Public Key File Format
# is documented in RFC 4716.
exportedKey = key.toRfc4716PublicKey()
success = key.SaveText(exportedKey,"pubkey_rfc4716.pub")

# OpenSSH has a separate public-key file format, which 
# is also supported by Chilkat SshKey:
exportedKey = key.toOpenSshPublicKey()
success = key.SaveText(exportedKey,"pubkey_openSsh.pub")

print "Finished." + "\n";