Class: JSON::LD::SIGNATURE::RsaSigner

Inherits:
Object
  • Object
show all
Defined in:
lib/json/ld/signature/rsaSigner.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#priv ⇒ Object 



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# File 'lib/json/ld/signature/rsaSigner.rb', line 14

def priv
  @priv
end

#pub ⇒ Object 



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# File 'lib/json/ld/signature/rsaSigner.rb', line 10

def pub
  @pub
end

Instance Method Details

#sign(input, options = {}) ⇒ Object 



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# File 'lib/json/ld/signature/rsaSigner.rb', line 18

def sign(input, options = {} )
  
  # We require a creator to identify the signing key
  
  if options['creator'].nil?
    raise JsonLdSignatureError::MissingCreator, "the creator of the signature must be identified"
  end
  
  creator = options['creator']
  
  # TODO: Validate the resolvability of the URL?

  # We require a privateKeyPem in the options hash
#      if options['privateKeyPem'].nil?
#        raise JsonLdSignatureError::MissingKey, "options parameter must include privateKeyPem"
#      end

  # The privateKeyPem can be either a String or a parsed RSA key
#      privateKey = case options['privateKeyPem']
#      when String then OpenSSL::PKey::RSA.new options['privateKeyPem']
#      when OpenSSL::PKey::RSA then options['privateKeyPem']
#      else 
#        raise JsonLdSignatureError::InvalidKeyType, "key must be RSA Key or PEM String"
#      end
  privateKey = @priv

  unless privateKey.private?
    raise JsonLdSignatureError::WrongKeyType, "submitted key is a public key"
  end

  # Check the input, it should either be a String or a parsed JSON object

  jsonld = case input
  when String then 
  begin
      JSON.parse(input)        
    rescue JSON::ParserError => e
        raise JsonLdSignatureError::InvalidJsonLdDocument, e.message
  end 
  when Hash then input
  else
    raise JsonLdSignatureError::InvalidJsonLdDocument
  end
  
  jsonld.delete 'signature'
#      created = Time.now.iso8601
  created = "2018-03-15T00:00:00Z"
  nonce = options['nonce']
  domain = options['domain']
        
  normOpts = {
    'nonce' => nonce,
    'domain' => options['domain'],
    'created' => created,
    'creator' => creator
  }
  
  normalizedGraph = JSON::LD::SIGNATURE::generateNormalizedGraph jsonld, normOpts
  
  digest = OpenSSL::Digest::SHA256.new
  signature = privateKey.sign digest, normalizedGraph
  enc = Base64.strict_encode64(signature)
  
   # "@context" : "https://w3id.org/security/v1",

  sigobj = JSON.parse %({
    "type" : "RsaSignature2017",
    "creator" : "#{creator}",
    "created" : "#{created}",
    "signatureValue" : "#{enc}"
  })
  
  sigobj['domain'] = domain unless options['domain'].nil?
  sigobj['nonce'] = nonce unless nonce.nil?
  
  jsonld['signature'] = sigobj
  jsonld.to_json
end