Class: COSE::Key::RSA

Inherits:
COSE::Key show all
Defined in:
lib/cose/key/rsa.rb

Constant Summary collapse

N = 
-1
E = 
-2
D = 
-3
P = 
-4
Q = 
-5
DP = 
-6
DQ = 
-7
QI = 
-8
ALGS = 
{
  PS256: -37,
  PS384: -38,
  PS512: -39,
  RSAES_OAEP_SHA1: -40,
  RSAES_OAEP_SHA256: -41,
  RSAES_OAEP_SHA512: -42
}

Constants inherited from COSE::Key

ALG, BASE_IV, KID, KTY, KTY_EC2, KTY_OKP, KTY_RSA, KTY_SYMMETRIC, OPS

Instance Attribute Summary collapse

Attributes inherited from COSE::Key

#alg, #base_iv, #kid, #kty, #ops, #raw

Instance Method Summary collapse

Methods inherited from COSE::Key

decode, detect

Constructor Details

#initialize(attrs = {}) ⇒ RSA

Returns a new instance of RSA.



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# File 'lib/cose/key/rsa.rb', line 24

def initialize(attrs = {})
  super
  self.n = attrs[N]
  self.e = attrs[E]
  self.d = attrs[D]
  self.p = attrs[P]
  self.q = attrs[Q]
  self.dp = attrs[DP]
  self.dq = attrs[DQ]
  self.qi = attrs[QI]
end

Instance Attribute Details

#d ⇒ Object

Returns the value of attribute d.



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# File 'lib/cose/key/rsa.rb', line 22

def d
  @d
end

#dp ⇒ Object

Returns the value of attribute dp.



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# File 'lib/cose/key/rsa.rb', line 22

def dp
  @dp
end

#dq ⇒ Object

Returns the value of attribute dq.



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# File 'lib/cose/key/rsa.rb', line 22

def dq
  @dq
end

#e ⇒ Object

Returns the value of attribute e.



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# File 'lib/cose/key/rsa.rb', line 22

def e
  @e
end

#n ⇒ Object

Returns the value of attribute n.



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# File 'lib/cose/key/rsa.rb', line 22

def n
  @n
end

#p ⇒ Object

Returns the value of attribute p.



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# File 'lib/cose/key/rsa.rb', line 22

def p
  @p
end

#q ⇒ Object

Returns the value of attribute q.



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# File 'lib/cose/key/rsa.rb', line 22

def q
  @q
end

#qi ⇒ Object

Returns the value of attribute qi.



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# File 'lib/cose/key/rsa.rb', line 22

def qi
  @qi
end

Instance Method Details

#alg_key ⇒ Object 



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# File 'lib/cose/key/rsa.rb', line 36

def alg_key
  ALGS.invert[alg] or
  raise UknownAlgorithm, 'Unknown Algorithm'
end

#digest ⇒ Object 



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# File 'lib/cose/key/rsa.rb', line 41

def digest
  case alg_key
  when :RSAES_OAEP_SHA1
    OpenSSL::Digest::SHA1
  when :PS256, :RSAES_OAEP_SHA256
    OpenSSL::Digest::SHA256
  when :PS384
    OpenSSL::Digest::SHA384
  when :PS512, :RSAES_OAEP_SHA512
    OpenSSL::Digest::SHA512
  end.new
end

#to_key ⇒ Object 



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# File 'lib/cose/key/rsa.rb', line 54

def to_key
  # Public key
  data_sequence = OpenSSL::ASN1::Sequence([
    OpenSSL::ASN1::Integer(n),
    OpenSSL::ASN1::Integer(e),
  ])

  if d && p && q && dp && dq && qi
    data_sequence = OpenSSL::ASN1::Sequence([
      OpenSSL::ASN1::Integer(0),
      OpenSSL::ASN1::Integer(n),
      OpenSSL::ASN1::Integer(e),
      OpenSSL::ASN1::Integer(d),
      OpenSSL::ASN1::Integer(p),
      OpenSSL::ASN1::Integer(q),
      OpenSSL::ASN1::Integer(dp),
      OpenSSL::ASN1::Integer(dq),
      OpenSSL::ASN1::Integer(qi),
    ])
  end

  asn1 = OpenSSL::ASN1::Sequence(data_sequence)
  OpenSSL::PKey::RSA.new(asn1.to_der)
  key = OpenSSL::PKey::RSA.new
  if key.respond_to? :set_key
    key.set_key n, e, d
    key.set_factors p, q if p && q
    key.set_crt_params dp, dq, qi if dp && dq && qi
  else
    key.e = e
    key.n = n
    key.d = d if d
    key.p = p if p
    key.q = q if q
    key.dmp1 = dp if dp
    key.dmq1 = dq if dq
    key.iqmp = qi if qi
  end
  key
end

#verify(signature, signature_base_string) ⇒ Object 



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# File 'lib/cose/key/rsa.rb', line 95

def verify(signature, signature_base_string)
  to_key.verify_pss digest, signature, signature_base_string
end