returned string is owned by the HMAC and should not be modified or freed.
Hmac.getString
string getString()Gets the HMAC as a hexadecimal string.
Once this function has been called the #GHmac can no longer be updated with [glib.hmac.Hmac.update].
The hexadecimal characters will be lower case.
Returns
the hexadecimal representation of the HMAC. The