Added SamrUnicodeChangePasswordUser2 request and response classes for…

[emrahozel]

Description

To implement the SamrUnicodeChangePasswordUser2 method I need a set of encryption operations. I need some suggestions on how to create them. For example in python impacket project:

def hSamrUnicodeChangePasswordUser2(dce, serverName='\x00', userName='', oldPassword='', newPassword='', oldPwdHashLM = '', oldPwdHashNT = ''):
  oldPwdHashNT = ntlm.NTOWFv1(oldPassword)
  newPwdHashNT` = ntlm.NTOWFv1(newPassword)
  samUser` = SAMPR_USER_PASSWORD()
  samUser['Length'] = len(newPassword)*2
  pwdBuff = samUser.getData()
  rc4 = ARC4.new(oldPwdHashNT)
  encBuf = rc4.encrypt(pwdBuff)
  request['NewPasswordEncryptedWithOldNt']['Buffer'] = encBuf
  request['OldNtOwfPasswordEncryptedWithNewNt'] = crypto.SamEncryptNTLMHash(oldPwdHashNT, newPwdHashNT)
  request['LmPresent'] = 0
  request['NewPasswordEncryptedWithOldLm'] = NULL
  request['OldLmOwfPasswordEncryptedWithNewNt'] = NULL

For example, I could not create the SamEncryptNTLMHash method, which has the LMOWFv1 method in the NtlmV1Functions class.