make me a php page that allows making user accounts
username = as entered in http form
passwordSalt = random string of letters
passwordHash generated as above using http form as password input
userIdent1 = unique sequential uint not bigger than 16777215
userIdent2 = unique sequential uint not bigger than 4294967295
using Crypto_RSA generate a RSA public/private key pair of 768 bits with publicExponent = 17 (i do not know if mxo will support any other kind of public exponent, but everything it does with RSA keys it uses public exponent 17)
so publicExponent in the database will always be 17
then store the publicModulus and privateExponent in the table (should be 96 byte binary data when generated)