Validate a JWS with a Public Key

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.SetPublicKey, which sets the public key used to validate a signature of a loaded JWS.

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()

#  Load the JWS compact serialization.
jwsCompact = "eyJhbGciOiJIUzI1NiJ9.VGhpcyBpcyB0aGUgY29udGVudCB0byBzaWduLg.<signature>"
success = jws.LoadJws(jwsCompact)
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 public key and set it for validating signature 0.
pubKey = Chilkat::CkPublicKey.new()
success = pubKey.LoadFromFile("qa_data/signer_pubkey.pem")
if (success == false)
    print pubKey.lastErrorText() + "\n";
    exit
end

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

#  Validate the signature.  Validate returns 1 when valid, 0 when not, or a negative value on error.
v = jws.Validate(0)
if (v < 0)
    print jws.lastErrorText() + "\n";
    exit
end

if (v != 1)
    print "The signature is not valid." + "\n";
    exit
end

print "The signature is valid." + "\n";