Add support for OpenSSL 3

Co-Authored-By: ClearlyClaire <ClearlyClaire@users.noreply.github.com>
Co-Authored-By: xfalcox <xfalcox@users.noreply.github.com>

lib/web_push/encryption.rb

@@ -10,8 +10,7 @@ def encrypt(message, p256dh, auth)
       group_name = 'prime256v1'
       salt = Random.new.bytes(16)
 
-      server = OpenSSL::PKey::EC.new(group_name)
-      server.generate_key
+      server = OpenSSL::PKey::EC.generate(group_name)
       server_public_key_bn = server.public_key.to_bn
 
       group = OpenSSL::PKey::EC::Group.new(group_name)

lib/web_push/vapid_key.rb

@@ -10,29 +10,22 @@ class VapidKey
     # @return [WebPush::VapidKey] a VapidKey instance for the given public and private keys
     def self.from_keys(public_key, private_key)
       key = new
-      key.public_key = public_key
-      key.private_key = private_key
-
+      key.set_keys! public_key, private_key
       key
     end
 
     # Create a VapidKey instance from pem encoded elliptic curve public and private keys
     #
     # @return [WebPush::VapidKey] a VapidKey instance for the given public and private keys
     def self.from_pem(pem)
-      key = new
-      src = OpenSSL::PKey.read pem
-      key.curve.public_key = src.public_key
-      key.curve.private_key = src.private_key
-
-      key
+      new(OpenSSL::PKey.read(pem))
     end
 
     attr_reader :curve
 
-    def initialize
-      @curve = OpenSSL::PKey::EC.new('prime256v1')
-      @curve.generate_key
+    def initialize(pkey = nil)
+      @curve = pkey
+      @curve = OpenSSL::PKey::EC.generate('prime256v1') if @curve.nil?
     end
 
     # Retrieve the encoded elliptic curve public key for VAPID protocol
@@ -57,11 +50,37 @@ def private_key
     end
 
     def public_key=(key)
-      curve.public_key = OpenSSL::PKey::EC::Point.new(group, to_big_num(key))
+      set_keys! key, nil
     end
 
     def private_key=(key)
-      curve.private_key = to_big_num(key)
+      set_keys! nil, key
+    end
+
+    def set_keys!(public_key = nil, private_key = nil)
+      if public_key.nil?
+        public_key = curve.public_key
+      else
+        public_key = OpenSSL::PKey::EC::Point.new(group, to_big_num(public_key))
+      end
+
+      if private_key.nil?
+        private_key = curve.private_key
+      else
+        private_key = to_big_num(private_key)
+      end
+
+      asn1 = OpenSSL::ASN1::Sequence([
+        OpenSSL::ASN1::Integer.new(1),
+        # Not properly padded but OpenSSL doesn't mind
+        OpenSSL::ASN1::OctetString(private_key.to_s(2)),
+        OpenSSL::ASN1::ObjectId('prime256v1', 0, :EXPLICIT),
+        OpenSSL::ASN1::BitString(public_key.to_octet_string(:uncompressed), 1, :EXPLICIT),
+      ])
+
+      der = asn1.to_der
+
+      @curve = OpenSSL::PKey::EC.new(der)
     end
 
     def curve_name

lib/web_push/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module WebPush
-  VERSION = '2.1.0'.freeze
+  VERSION = '3.0.0'.freeze
 end

spec/web_push/encryption_spec.rb

@@ -4,9 +4,7 @@
   describe '#encrypt' do
     let(:curve) do
       group = 'prime256v1'
-      curve = OpenSSL::PKey::EC.new(group)
-      curve.generate_key
-      curve
+      OpenSSL::PKey::EC.generate(group)
     end
 
     let(:p256dh) do