Class: ECHConfig::ECHConfigContents::HpkeKeyConfig

Inherits:
Object
  • Object
show all
Extended by:
T::Sig
Defined in:
lib/ech_config/ech_config_contents/hpke_key_config.rb,
lib/ech_config/ech_config_contents/hpke_key_config.rb

Overview

typed: true frozen_string_literal: true

Defined Under Namespace

Classes: HpkeKemId, HpkePublicKey, HpkeSymmetricCipherSuite

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config_id, kem_id, public_key, cipher_suites) ⇒ HpkeKeyConfig

Returns a new instance of HpkeKeyConfig.



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# File 'lib/ech_config/ech_config_contents/hpke_key_config.rb', line 23

def initialize(config_id,
               kem_id,
               public_key,
               cipher_suites)
  @config_id = config_id
  @kem_id = kem_id
  @public_key = public_key
  @cipher_suites = cipher_suites
end

Instance Attribute Details

#cipher_suites ⇒ Object (readonly)

Returns the value of attribute cipher_suites.



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# File 'lib/ech_config/ech_config_contents/hpke_key_config.rb', line 13

def cipher_suites
  @cipher_suites
end

#config_id ⇒ Object (readonly)

Returns the value of attribute config_id.



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# File 'lib/ech_config/ech_config_contents/hpke_key_config.rb', line 13

def config_id
  @config_id
end

#kem_id ⇒ Object (readonly)

Returns the value of attribute kem_id.



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# File 'lib/ech_config/ech_config_contents/hpke_key_config.rb', line 13

def kem_id
  @kem_id
end

#public_key ⇒ Object (readonly)

Returns the value of attribute public_key.



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# File 'lib/ech_config/ech_config_contents/hpke_key_config.rb', line 13

def public_key
  @public_key
end

Class Method Details

.decode(octet) ⇒ Object

Raises:



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# File 'lib/ech_config/ech_config_contents/hpke_key_config.rb', line 45

def self.decode(octet)
  raise ::ECHConfig::DecodeError if octet.empty?

  config_id = octet.slice(0, 1)&.unpack1('C')
  i = 1
  raise ::ECHConfig::DecodeError if i + 2 > octet.length

  kem_id = HpkeKemId.decode(octet.slice(i, 2) || '')
  i += 2
  raise ::ECHConfig::DecodeError if i + 2 > octet.length

  pk_len = octet.slice(i, 2)&.unpack1('n')
  i += 2
  raise ::ECHConfig::DecodeError if i + pk_len > octet.length

  public_key = HpkePublicKey.decode(octet.slice(i, pk_len) || '')
  i += pk_len
  raise ::ECHConfig::DecodeError if i + 2 > octet.length

  cs_len = octet.slice(i, 2)&.unpack1('n')
  i += 2
  raise ::ECHConfig::DecodeError if i + 2 > octet.length

  cs_bin = octet.slice(i, cs_len)
  i += cs_len
  cipher_suites = HpkeSymmetricCipherSuite.decode_vectors(cs_bin || '')
  hpke_key_config = new(
    config_id,
    kem_id,
    public_key,
    cipher_suites
  )
  [hpke_key_config, octet[i..]]
end

Instance Method Details

#encode ⇒ Object 



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# File 'lib/ech_config/ech_config_contents/hpke_key_config.rb', line 34

def encode
  [@config_id].pack('C') \
  + @kem_id.encode \
  + @public_key.encode \
  + @cipher_suites.map(&:encode).join.then { |s| [s.length].pack('n') + s }
end