Sign a JWS with a Private Key

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.SetPrivateKey, which sets the private key used to create a signature. The example uses RS256 (RSASSA-PKCS1-v1_5 with SHA-256).

The file path is relative to the application's current working directory. An absolute path may also be used. Supply the path appropriate to your own environment.

require 'chilkat'

success = false

jws = Chilkat::CkJws.new()

#  Protected header specifying RSASSA-PKCS1-v1_5 with SHA-256 (RS256).
header = Chilkat::CkJsonObject.new()
header.UpdateString("alg","RS256")
success = jws.SetProtectedHeader(0,header)
if (success == false)
    print jws.lastErrorText() + "\n";
    exit
end

bIncludeBom = false
success = jws.SetPayload("This is the content to sign.","utf-8",bIncludeBom)
if (success == false)
    print jws.lastErrorText() + "\n";
    exit
end

#  The file path is relative to the application's current working directory.  An absolute path
#  may also be used.  Supply the path appropriate to your own environment.
#  Load the signer's private key and set it for signature 0.
privKey = Chilkat::CkPrivateKey.new()
success = privKey.LoadPemFile("qa_data/signer_privkey.pem")
if (success == false)
    print privKey.lastErrorText() + "\n";
    exit
end

success = jws.SetPrivateKey(0,privKey)
if (success == false)
    print jws.lastErrorText() + "\n";
    exit
end

jwsCompact = jws.createJws()
if (jws.get_LastMethodSuccess() == false)
    print jws.lastErrorText() + "\n";
    exit
end

print jwsCompact + "\n";