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

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"
# }