Class: String

Inherits:
Object
  • Object
show all
Defined in:
lib/smbRpc/updateString/to_des_ecb_lm.rb,
lib/smbRpc/updateString/raise_not_error_success.rb

Instance Method Summary collapse

Instance Method Details

#genKeys(sevenByteStr) ⇒ Object

MS-SAMR

2.2.11.1.4



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# File 'lib/smbRpc/updateString/to_des_ecb_lm.rb', line 2

def genKeys(sevenByteStr)					#[MS-SAMR] 2.2.11.1.4
  sevenBitsArray = sevenByteStr.unpack("B*")[0].scan(/......./)	#grab each 7 bits into array
  eightBitsStr = ""						#[MS-SAMR]2.2.11.1.2 Encrypting a 64-Bit Block with a 7-Byte Key
  sevenBitsArray.each do |e|
    count = 0
    e.split("").each{ |i| count += 1 if i == "1" }		#add parity bit to each chunks (1 if sum of bits even)
    eightBitsStr << e
    eightBitsStr << (count % 2 == 0? "0" : "1")		#MS-SAMR 2.2.11.1.2 says if odd use 0???
  end
  return [eightBitsStr].pack("B*")				#pack back to 8 bytes key
end

#raise_not_error_success(funcName) ⇒ Object 



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# File 'lib/smbRpc/updateString/raise_not_error_success.rb', line 3

def raise_not_error_success(funcName)
  winError = self[-4,4].unpack("V")[0]
  error = WindowsError::Win32.find_by_retval(winError)[0]
  error = WindowsError::NTStatus.find_by_retval(winError)[0] if error.nil?
  raise "%s Fail, WinError: %s 0x%08x"%[funcName, "UNKNOWN ERROR CODE", winError ] if error.nil?
  error.value == 0? error.value : (raise "%s Fail, WinError: %s %s"%[funcName, error.name, error.description])
end

#to_des_ecb_lm(key) ⇒ Object 



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# File 'lib/smbRpc/updateString/to_des_ecb_lm.rb', line 14

def to_des_ecb_lm(key)
  #keys
  key1 = genKeys(key[0,7])
  key2 = genKeys(key[7,7])
  #hash
  hash1 = self[0,8]
  hash2 = self[8,8]
  #encrypt
  #[MS-SAMR]2.2.11 Common Algorithms
  #2.2.11.1 DES-ECB-LM
  #2.2.11.1.1 Encrypting an NT or LM Hash Value with a Specified Key
  out = ""
  desEcb = OpenSSL::Cipher.new("DES-ECB")
  desEcb.encrypt
  desEcb.key = key1
  out << desEcb.update(hash1)
  desEcb.key = key2
  out << desEcb.update(hash2)
  return out
end