Sign a JWS with an HMAC Key

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.SetMacKey, which sets the symmetric MAC key for a signature. The key bytes are supplied in a named encoding such as hex or base64.

require 'chilkat'

success = false

jws = Chilkat::CkJws.new()

#  Protected header specifying HMAC-SHA256.
header = Chilkat::CkJsonObject.new()
header.UpdateString("alg","HS256")
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

#  Set the symmetric MAC key for signature 0.  The key bytes are provided in the named encoding (here
#  base64).  In production, obtain the key from a secure source rather than hard-coding it.
base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
success = jws.SetMacKey(0,base64Key,"base64")
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";