Calculates the hash of a secret for use in phased transactions with voting model 5 (Vote By Secret).
requestType is hash
hashAlgorithm is the hash function used: 2 for SHA256, 3 for SHA3, 5 for SCRYPT, 6 for RIPEMD160, 25 for Keccack25 and 62 for SHA256 followed by RIPEMD160, according to Get Constants
secret is a secret phrase in text form or hex string form
secretIsText is true if secret is text, false if it is a hex string (optional)
Note: secret is converted from a hex string to a byte array, which is what the hash algorithm expects, unless secretIsText is true, in which case secret is first converted from text to a UTF-8 hex string as by Hex Convert.
hash (S) is the hash of the secret, in the form of a hex string
requestProcessingTime (N) is the API request processing time (in millisec)