(Ruby) Get ECC Private Key in JWK Format (JSON Web Key)

Demonstrates how to get an ECC private key in JWK (JSON Web Key) format.

Note: This example requires Chilkat v9.5.0.66 or later.

Chilkat Ruby Downloads Ruby Library for Linux and MAC OS X

require 'chilkat'

#  Note: This example requires Chilkat v9.5.0.66 or later.

#  Load a PEM file into memory.
sbPem = Chilkat::CkStringBuilder.new()
success = sbPem.LoadFile("qa_data/pem/ecc_privKey.pem","utf-8")
if (success != true)
    print "Failed to load PEM file." + "\n";
    exit
end

#  Load the PEM into a private key object.
privKey = Chilkat::CkPrivateKey.new()
success = privKey.LoadPem(sbPem.getAsString())
if (success != true)
    print privKey.lastErrorText() + "\n";
    exit
end

#  Get the private key in JWK format:
jwk = privKey.getJwk()

#  The GetJwk method will return the JWK in the most compact JSON format possible,
#  as a single line with no extra whitespace.  To get a more human-readable JWK (for this example),
#  load into a Chilkat JSON object and emit non-compact:

json = Chilkat::CkJsonObject.new()
json.Load(jwk)
json.put_EmitCompact(false)
print "ECC Private Key in JWK format:" + "\n";
print json.emit() + "\n";

#  Sample output:
#  {
#    "kty": "EC",
#    "crv": "P-256",
#    "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
#    "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
#    "d": "EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM"
#  }
# 

#  Additional information can be added like this:
json.AppendString("use","enc")
json.AppendString("kid","123ABC")

#  Now examine the JSON:
print json.emit() + "\n";

#  {
#    "kty": "EC",
#    "crv": "P-256",
#    "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
#    "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
#    "d": "EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM",
#    "use": "enc",
#    "kid": "123ABC"
#  }