106 lines
3.1 KiB
Ruby
106 lines
3.1 KiB
Ruby
# -*- coding: binary -*-
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module Rex
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module Proto
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module Kerberos
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module Model
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# This class provides a representation of a Kerberos EncryptionKey data
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# definition
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class EncryptionKey < Element
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# @!attribute key
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# @return [Fixnum] The type of encryption key
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attr_accessor :type
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# @!attribute value
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# @return [String] the key itself
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attr_accessor :value
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# Decodes a Rex::Proto::Kerberos::Model::EncryptionKey
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#
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# @param input [String, OpenSSL::ASN1::Sequence] the input to decode from
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# @return [self] if decoding succeeds
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# @raise [RuntimeError] if decoding doesn't succeed
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def decode(input)
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case input
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when String
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decode_string(input)
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when OpenSSL::ASN1::Sequence
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decode_asn1(input)
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else
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raise ::RuntimeError, 'Failed to decode EncryptionKey, invalid input'
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end
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self
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end
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# Encodes a Rex::Proto::Kerberos::Model::EncryptionKey into an
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# ASN.1 String
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#
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# @return [String]
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def encode
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elems = []
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elems << OpenSSL::ASN1::ASN1Data.new([encode_type], 0, :CONTEXT_SPECIFIC)
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elems << OpenSSL::ASN1::ASN1Data.new([encode_value], 1, :CONTEXT_SPECIFIC)
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seq = OpenSSL::ASN1::Sequence.new(elems)
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seq.to_der
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end
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private
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# Decodes a Rex::Proto::Kerberos::Model::EncryptionKey from an String
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#
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# @param input [String] the input to decode from
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def decode_string(input)
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asn1 = OpenSSL::ASN1.decode(input)
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decode_asn1(asn1)
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end
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# Decodes a Rex::Proto::Kerberos::Model::EncryptionKey from an
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# OpenSSL::ASN1::Sequence
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#
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# @param input [OpenSSL::ASN1::Sequence] the input to decode from
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def decode_asn1(input)
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seq_values = input.value
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self.type = decode_type(seq_values[0])
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self.value = decode_value(seq_values[1])
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end
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# Decodes the type from an OpenSSL::ASN1::ASN1Data
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#
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# @param input [OpenSSL::ASN1::ASN1Data] the input to decode from
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# @return [Fixnum]
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def decode_type(input)
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input.value[0].value.to_i
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end
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# Decodes the value from an OpenSSL::ASN1::ASN1Data
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#
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# @param input [OpenSSL::ASN1::ASN1Data] the input to decode from
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# @return [String]
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def decode_value(input)
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input.value[0].value
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end
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# Encodes the type field
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#
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# @return [OpenSSL::ASN1::Integer]
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def encode_type
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bn = OpenSSL::BN.new(type.to_s)
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int = OpenSSL::ASN1::Integer.new(bn)
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int
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end
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# Encodes the value field
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#
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# @return [OpenSSL::ASN1::OctetString]
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def encode_value
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OpenSSL::ASN1::OctetString.new(value)
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end
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end
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end
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end
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end
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end |