History information of the hash algorithm and key. Different accounts' passwords may be generated by different version.
Different password hash algorithms used in Identity Toolkit.
Memory cost for hash calculation. Used by scrypt and other similar password derivation algorithms. See https://tools.ietf.org/html/rfc7914 for explanation of field.
How many rounds for hash calculation. Used by scrypt and other similar password derivation algorithms.
Non-printable character to be inserted between the salt and plain text password in base64.
Signer key in base64.