Class: COSE::Key::RSA

Inherits:
Base
  • Object
show all
Defined in:
lib/cose/key/rsa.rb

Constant Summary collapse

LABEL_N = 
-1
LABEL_E = 
-2
LABEL_D = 
-3
LABEL_P = 
-4
LABEL_Q = 
-5
LABEL_DP = 
-6
LABEL_DQ = 
-7
LABEL_QINV = 
-8
KTY_RSA = 
3

Constants inherited from Base

Base::LABEL_ALG, Base::LABEL_BASE_IV, Base::LABEL_KEY_OPS, Base::LABEL_KID, Base::LABEL_KTY

Instance Attribute Summary collapse

Attributes inherited from Base

#alg, #base_iv, #key_ops, #kid

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Base

deserialize, from_map, #serialize

Constructor Details

#initialize(n:, e:, d: nil, p: nil, q: nil, dp: nil, dq: nil, qinv: nil, **keyword_arguments) ⇒ RSA

rubocop:disable Naming/MethodParameterName



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# File 'lib/cose/key/rsa.rb', line 50

def initialize(n:, e:, d: nil, p: nil, q: nil, dp: nil, dq: nil, qinv: nil, **keyword_arguments) # rubocop:disable Naming/MethodParameterName
  super(**keyword_arguments)

  if !n
    raise ArgumentError, "Required public field n is missing"
  elsif !e
    raise ArgumentError, "Required public field e is missing"
  else
    private_fields = { d: d, p: p, q: q, dp: dp, dq: dq, qinv: qinv }

    if private_fields.values.all?(&:nil?) || private_fields.values.none?(&:nil?)
      @n = n
      @e = e
      @d = d
      @p = p
      @q = q
      @dp = dp
      @dq = dq
      @qinv = qinv
    else
      missing = private_fields.detect { |_k, v| v.nil? }[0]
      raise ArgumentError, "Incomplete private fields, #{missing} is missing"
    end
  end
end

Instance Attribute Details

#d ⇒ Object (readonly)

Returns the value of attribute d.



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# File 'lib/cose/key/rsa.rb', line 48

def d
  @d
end

#dp ⇒ Object (readonly)

Returns the value of attribute dp.



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# File 'lib/cose/key/rsa.rb', line 48

def dp
  @dp
end

#dq ⇒ Object (readonly)

Returns the value of attribute dq.



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# File 'lib/cose/key/rsa.rb', line 48

def dq
  @dq
end

#e ⇒ Object (readonly)

Returns the value of attribute e.



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# File 'lib/cose/key/rsa.rb', line 48

def e
  @e
end

#n ⇒ Object (readonly)

Returns the value of attribute n.



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# File 'lib/cose/key/rsa.rb', line 48

def n
  @n
end

#p ⇒ Object (readonly)

Returns the value of attribute p.



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# File 'lib/cose/key/rsa.rb', line 48

def p
  @p
end

#q ⇒ Object (readonly)

Returns the value of attribute q.



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# File 'lib/cose/key/rsa.rb', line 48

def q
  @q
end

#qinv ⇒ Object (readonly)

Returns the value of attribute qinv.



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# File 'lib/cose/key/rsa.rb', line 48

def qinv
  @qinv
end

Class Method Details

.enforce_type(map) ⇒ Object 



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# File 'lib/cose/key/rsa.rb', line 20

def self.enforce_type(map)
  if map[LABEL_KTY] != KTY_RSA
    raise "Not an RSA key"
  end
end

.from_pkey(pkey) ⇒ Object 



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# File 'lib/cose/key/rsa.rb', line 26

def self.from_pkey(pkey)
  params = pkey.params

  attributes = {
    n: params["n"].to_s(2),
    e: params["e"].to_s(2)
  }

  if pkey.private?
    attributes.merge!(
      d: params["d"].to_s(2),
      p: params["p"].to_s(2),
      q: params["q"].to_s(2),
      dp: params["dmp1"].to_s(2),
      dq: params["dmq1"].to_s(2),
      qinv: params["iqmp"].to_s(2)
    )
  end

  new(**attributes)
end

.keyword_arguments_for_initialize(map) ⇒ Object 



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# File 'lib/cose/key/rsa.rb', line 122

def self.keyword_arguments_for_initialize(map)
  {
    n: map[LABEL_N],
    e: map[LABEL_E],
    d: map[LABEL_D],
    p: map[LABEL_P],
    q: map[LABEL_Q],
    dp: map[LABEL_DP],
    dq: map[LABEL_DQ],
    qinv: map[LABEL_QINV]
  }
end

Instance Method Details

#map ⇒ Object 



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# File 'lib/cose/key/rsa.rb', line 76

def map
  super.merge(
    Base::LABEL_KTY => KTY_RSA,
    LABEL_N => n,
    LABEL_E => e,
    LABEL_D => d,
    LABEL_P => p,
    LABEL_Q => q,
    LABEL_DP => dp,
    LABEL_DQ => dq,
    LABEL_QINV => qinv
  ).compact
end

#to_pkey ⇒ Object 



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# File 'lib/cose/key/rsa.rb', line 90

def to_pkey
  # PKCS#1 RSAPublicKey
  asn1 = OpenSSL::ASN1::Sequence(
    [
      OpenSSL::ASN1::Integer.new(bn(n)),
      OpenSSL::ASN1::Integer.new(bn(e)),
    ]
  )
  pkey = OpenSSL::PKey::RSA.new(asn1.to_der)

  if private?
    # PKCS#1 RSAPrivateKey
    asn1 = OpenSSL::ASN1::Sequence(
      [
        OpenSSL::ASN1::Integer.new(0),
        OpenSSL::ASN1::Integer.new(bn(n)),
        OpenSSL::ASN1::Integer.new(bn(e)),
        OpenSSL::ASN1::Integer.new(bn(d)),
        OpenSSL::ASN1::Integer.new(bn(p)),
        OpenSSL::ASN1::Integer.new(bn(q)),
        OpenSSL::ASN1::Integer.new(bn(dp)),
        OpenSSL::ASN1::Integer.new(bn(dq)),
        OpenSSL::ASN1::Integer.new(bn(qinv)),
      ]
    )

    pkey = OpenSSL::PKey::RSA.new(asn1.to_der)
  end

  pkey
end