(Ruby) Create JWS using the Flattened JSON Serialization Format

Creates a JSON Web Signature (JWS) containing 1 signature and output using the flattened JSON serialization format.

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

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

require 'chilkat'

# This requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

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

# The JWS to be created will contain one signature using an ECDSA key.

sbEccJwk = Chilkat::CkStringBuilder.new()
sbEccJwk.Append("{\"kty\":\"EC\",")
sbEccJwk.Append("\"crv\":\"P-256\",")
sbEccJwk.Append("\"x\":\"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU\",")
sbEccJwk.Append("\"y\":\"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0\",")
sbEccJwk.Append("\"d\":\"jpsQnnGQmL-YBIffH1136cspYG6-0iY7X1fCE9-E9LI\"")
sbEccJwk.Append("}")

eccKey = Chilkat::CkPrivateKey.new()
# Note: This example loads the ECDSA key from JWK format.  Any format can be loaded
# into the private key object. (See the online reference documentation..)
success = eccKey.LoadJwk(sbEccJwk.getAsString())
if (success != true)
    print eccKey.lastErrorText() + "\n";
    exit
end

# ---------------------------------------------------
# Prepare both a protected and unprotected header.

jwsProtHdr = Chilkat::CkJsonObject.new()
jwsProtHdr.AppendString("alg","ES256")

jwsUnprotHdr = Chilkat::CkJsonObject.new()
jwsUnprotHdr.AppendString("kid","myEcKey")

# ---------------------------------------------------
jws = Chilkat::CkJws.new()

jws.SetProtectedHeader(0,jwsProtHdr)
jws.SetUnprotectedHeader(0,jwsUnprotHdr)

jws.SetPrivateKey(0,eccKey)

bIncludeBom = false
payloadStr = "In our village, folks say God crumbles up the old moon into stars."
jws.SetPayload(payloadStr,"utf-8",bIncludeBom)

# ---------------------------------------------------
# Create the JWS.
# Indicate we prefer the non-compact, flattened serialization.
jws.put_PreferCompact(false)
jws.put_PreferFlattened(true)

jwsStr = jws.createJws()
if (jws.get_LastMethodSuccess() != true)
    print jws.lastErrorText() + "\n";
    exit
end

# The jwsStr is contains the flattened JSON in the smallest possible size, which is a single line.
# To get in human-readable format, load into a Chilkat JSON object and emit..
json = Chilkat::CkJsonObject.new()
json.Load(jwsStr)
json.put_EmitCompact(false)
print json.emit() + "\n";

# Sample output:

# { 
#   "payload": "SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu",
#   "protected": "eyJhbGciOiJFUzI1NiJ9",
#   "header": { 
#     "kid": "myEcKey"
#   },
#   "signature": "b7V2UpDPytr-kMnM_YjiQ3E0J2ucOI9LYA7mt57vccrK1rb84j9areqgQcJwOA00aWGoz4hf6sMTBfobdcJEGg"
# }