class Rex::Proto::Kerberos::Model::EncryptionKey

This class provides a representation of a Kerberos EncryptionKey data definition

Attributes

type[RW]

@!attribute key

@return [Fixnum] The type of encryption key
value[RW]

@!attribute value

@return [String] the key itself

Public Instance Methods

decode(input) click to toggle source

Decodes a Rex::Proto::Kerberos::Model::EncryptionKey

@param input [String, OpenSSL::ASN1::Sequence] the input to decode from @return [self] if decoding succeeds @raise [RuntimeError] if decoding doesn't succeed

# File lib/rex/proto/kerberos/model/encryption_key.rb, line 22
def decode(input)
  case input
  when String
    decode_string(input)
  when OpenSSL::ASN1::Sequence
    decode_asn1(input)
  else
    raise ::RuntimeError, 'Failed to decode EncryptionKey, invalid input'
  end

  self
end
encode() click to toggle source

Encodes a Rex::Proto::Kerberos::Model::EncryptionKey into an ASN.1 String

@return [String]

# File lib/rex/proto/kerberos/model/encryption_key.rb, line 39
def encode
  elems = []
  elems << OpenSSL::ASN1::ASN1Data.new([encode_type], 0, :CONTEXT_SPECIFIC)
  elems << OpenSSL::ASN1::ASN1Data.new([encode_value], 1, :CONTEXT_SPECIFIC)
  seq = OpenSSL::ASN1::Sequence.new(elems)

  seq.to_der
end

Private Instance Methods

decode_asn1(input) click to toggle source

Decodes a Rex::Proto::Kerberos::Model::EncryptionKey from an OpenSSL::ASN1::Sequence

@param input [OpenSSL::ASN1::Sequence] the input to decode from

# File lib/rex/proto/kerberos/model/encryption_key.rb, line 63
def decode_asn1(input)
  seq_values = input.value
  self.type = decode_type(seq_values[0])
  self.value = decode_value(seq_values[1])
end
decode_string(input) click to toggle source

Decodes a Rex::Proto::Kerberos::Model::EncryptionKey from an String

@param input [String] the input to decode from

# File lib/rex/proto/kerberos/model/encryption_key.rb, line 53
def decode_string(input)
  asn1 = OpenSSL::ASN1.decode(input)

  decode_asn1(asn1)
end
decode_type(input) click to toggle source

Decodes the type from an OpenSSL::ASN1::ASN1Data

@param input [OpenSSL::ASN1::ASN1Data] the input to decode from @return [Fixnum]

# File lib/rex/proto/kerberos/model/encryption_key.rb, line 73
def decode_type(input)
  input.value[0].value.to_i
end
decode_value(input) click to toggle source

Decodes the value from an OpenSSL::ASN1::ASN1Data

@param input [OpenSSL::ASN1::ASN1Data] the input to decode from @return [String]

# File lib/rex/proto/kerberos/model/encryption_key.rb, line 81
def decode_value(input)
  input.value[0].value
end
encode_type() click to toggle source

Encodes the type field

@return [OpenSSL::ASN1::Integer]

# File lib/rex/proto/kerberos/model/encryption_key.rb, line 88
def encode_type
  bn = OpenSSL::BN.new(type.to_s)
  int = OpenSSL::ASN1::Integer.new(bn)

  int
end
encode_value() click to toggle source

Encodes the value field

@return [OpenSSL::ASN1::OctetString]

# File lib/rex/proto/kerberos/model/encryption_key.rb, line 98
def encode_value
  OpenSSL::ASN1::OctetString.new(value)
end