What is "vault" in step 2 for the Zoho Vault API?

What is "vault" in step 2 for the Zoho Vault API?

Here is the code snippet provided in the documentation:

 var masterKey = null;
 var passphrase = "user_passphrase"; if(LOGINTYPE == "PBKDF2_AES"){ 
 var masterKey = Vault.PBKDF2_key(passphrase, SALT, ITERATION); }else{ 
 var masterKey = Vault.hash(passphrase); 
 var passAuth = Vault.hash(passphrase+SALT); } 

What is "Vault" in the statement "Vault.PBKDF2_key"? Is it a library, or an object? And how do I get it? Is it possible to provide a more complete program insteaad of the snippet?

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