Class: RubySMB::Dcerpc::Samr::EncryptedNtOwfPassword

Inherits:
Ndr::NdrStruct
  • Object
show all
Defined in:
lib/ruby_smb/dcerpc/samr.rb

Overview

2.2.7.3 ENCRYPTED_NT_OWF_PASSWORD

Direct Known Subclasses

PencryptedNtOwfPassword

Class Method Summary collapse

Methods inherited from Ndr::NdrStruct

#initialize_shared_instance, method_missing, validate_conformant_array

Class Method Details

.encrypt_hash(hash:, key:) ⇒ Object

2.2.11.1 DES-ECB-LM



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# File 'lib/ruby_smb/dcerpc/samr.rb', line 347

def self.encrypt_hash(hash:, key:)
  block1 = hash[0..7]
  block2 = hash[8..]
  key1 = to_output_key(key[0..6])
  key2 = to_output_key(key[7..13]) # The last two bytes are ignored

  cipher1 = OpenSSL::Cipher.new('des-ecb').tap do |cipher|
    cipher.encrypt
    cipher.key = key1
  end

  cipher2 = OpenSSL::Cipher.new('des-ecb').tap do |cipher|
    cipher.encrypt
    cipher.key = key2
  end

  cipher1.update(block1) + cipher2.update(block2)
end

.to_output_key(input_key) ⇒ Object

2.2.11.1.2 Encrypting a 64-bit block with a 7-byte key



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# File 'lib/ruby_smb/dcerpc/samr.rb', line 329

def self.to_output_key(input_key)
  output_key = []
  input_key = input_key.unpack('C'*7)
  output_key.append(input_key[0] >> 0x01)
  output_key.append(((input_key[0]&0x01)<<6) | (input_key[1]>>2))
  output_key.append(((input_key[1]&0x03)<<5) | (input_key[2]>>3))
  output_key.append(((input_key[2]&0x07)<<4) | (input_key[3]>>4))
  output_key.append(((input_key[3]&0x0F)<<3) | (input_key[4]>>5))
  output_key.append(((input_key[4]&0x1F)<<2) | (input_key[5]>>6))
  output_key.append(((input_key[5]&0x3F)<<1) | (input_key[6]>>7))
  output_key.append(input_key[6] & 0x7F)

  output_key = output_key.map {|x| (x << 1) & 0xFE}

  output_key.pack('C'*8)
end