Question

我使用JCSL - Javascript在客户端(documentation)和OpenSSL - Ruby on server (documentation)上使用Elliptic Curve Diffie-Hellman在客户端和服务器上生成对称密钥。

我终于设法正确地格式化了客户端和服务器发送的公钥，我终于生成了一个对称密钥而没有任何运行时错误(my previous question)

但是，现在的问题是Client's Symmetric Key != Server's Symmetric Key

我觉得最好能在你的计算机上试试这个，所以我想从JCSL上传已编译的JS文件（包括Elliptic Curve）以便于测试(link)

我的代码如下（您可以复制粘贴它以方便测试）：

#Ruby on Rails
class EcdhController < ApplicationController

  @@group = OpenSSL::PKey::EC::Group.new('secp384r1')
  @@ec = OpenSSL::PKey::EC.new(@@group)

  def connect
    logger.info('CONNECT PAGE:::::::::::::::::')
  end

  def send_params
    logger.info('SEND_PARAMS::::::::::::::::::')

    #GENERATE PUBLIC AND PRIVATE KEYS
    @@ec.generate_key

    #SEND PUBLIC KEY TO CLIENT/BROWSER
    #[2..-1] means I've removed the first two Hex characters which is x04 which I think is automatically prepended by OpenSSL which causes errors in the Client JS side
    render :json => {:server_pub_key => @@ec.public_key.to_bn.to_s(16)[2..-1]}
  end

  def receive_client_pub_key
    logger.info('RECEIVE_CLIENT_PUB_KEY:::::::::::::::')

    #Convert properly the format of the JCSL pub key on client side
    client_pub_key = (params[:client_pub_key].split(",").map { |s| s.to_i }).pack('N*')

    #Copied from https://stackoverflow.com/questions/11135420/elliptic-curve-cryptography-with-sjcl-in-js-and-openssl-in-ruby
    algokey = OpenSSL::ASN1::ObjectId 'id-ecPublicKey'
    algovalue = OpenSSL::ASN1::ObjectId 'secp384r1'
    algo = OpenSSL::ASN1::Sequence.new [algokey,algovalue]
    # for some reason OpenSSL seems to prepend 0x04 to all public keys
    key = OpenSSL::ASN1::BitString.new "\x04#{client_pub_key}"
    root = OpenSSL::ASN1::Sequence.new [algo,key]

    pub = OpenSSL::PKey.read(root.to_der)
    #-End of copied code-#

    #COMPUTE SYMMETRIC KEY
    symm_key = @@ec.dh_compute_key(pub.public_key)

    puts "SYMM KEY: #{symm_key.unpack('H*').first}"

    #---> SYMM KEY: f8de0a7012765a1ff8b7630c917a1d3d2ac9cc0d782fbb6c0c101128a29232fec5194468b7ed846053abab05744c61e9    

    render :json => nil
  end
end

在客户端，

//Javascript
<h1>Ecdh#connect</h1>
<p>Find me in app/views/ecdh/connect.html.erb</p>

<script>
    $(document).ready(function ()
    {
        var server_pub_key;
        var client_priv_key;
        var client_pub_key;

        connect();

        function connect()
        {
            //Receive Server Public Key
            jQuery.getJSON('<%= url_for(:controller => :ecdh, :action => :send_params) %>', function(data)
            {
                //Get Server Public Key
                server_pub_key_Bits = new sjcl.bn(data.server_pub_key.toString()).toBits(); //Convert Hex String to BN, and then to Bits

                //Client Keys
                client_keys = sjcl.ecc.elGamal.generateKeys(384, 0);
                client_keys.generate_keys;

                client_pub_key_Hex = sjcl.bn.fromBits( client_keys.pub.serialize().point ).toString(16); //Into bits, then to Hex
                client_priv_key = client_keys.sec; //sjcl.ecc.elGamal.privateKey format

                //Send Client/Own Public Key to Server
                jQuery.getJSON('<%= url_for(:controller => :ecdh, :action => :receive_client_pub_key) %>?client_pub_key='+client_keys.pub.serialize().point, function()
                {
                    //Set Curve from Template
                    curve = sjcl.ecc.curves['c384'];

                    //Convert server_pub_key_Bits to proper 'publicKey' format
                    server_pub_key = new sjcl.ecc.elGamal.publicKey(384, curve, server_pub_key_Bits);

                    //Compute Shared Key
                    symm_key_Bits = client_priv_key.dh(server_pub_key);
                    symm_key_Hex = sjcl.bn.fromBits(symm_key_Bits).toString(16);

                    console.log(symm_key_Hex);

                    //---> 0xa779359617b008884b67c0785a3f782b9dca6e46f9586f7e911b73de877f2aca
                }); 
            }); 
        }
    }); 
</script>

因此我的问题是

f8de0a7012765a1ff8b7630c917a1d3d2ac9cc0d782fbb6c0c101128a29232fec5194468b7ed846053abab05744c61e9
!=
0xa779359617b008884b67c0785a3f782b9dca6e46f9586f7e911b73de877f2aca

如果您想要测试或其他任何东西，请随时问我如何转换格式和内容，因为这对我的项目至关重要。请帮忙。感谢

Answer 1

我终于解决了这个问题：）

我现在在Javascript-client上使用JSBN-EC (link)而不是JCSL。

有关详细信息，请参阅(this)我的另一个问题

椭圆曲线Diffie-Hellman对称密钥在客户端和服务器上不匹配

1 个答案: