nl_tokens: Creates a signer given the specified schema and key .
pl_tokens: function createSigner ( signatureScheme , signatureKey ) { if ( signatureKey ) { // Create a SHA256-based signer that generates and validates signatures signatureScheme = signatureScheme || 'sha256' ; if ( signatureScheme . indexOf ( 'hmac-' ) === 0 ) { signatureScheme = signatureScheme . substr ( 5 ) ; } return { sign : function ( <mask> ) { return computeSignature ( values , signatureScheme , signatureKey ) ; } , validate : function ( signature , values ) { return signature === computeSignature ( values , signatureScheme , signatureKey ) ; } } } else { // Create a no-op signer return { sign : function ( ) { return '' ; } , validate : function ( ) { return true ; } } } }