javascript - 在 RSA 中将 .net 公共 xml 密钥导入到 javascript

Question

我有用 C# 创建的 XML 中的公钥，格式为：

<Modulus>rYDd94biRAJ1P6j68xjARl......and so on</Modulus>
<Exponent>A**B</Exponent>

我想在 Javascript 中创建这个密钥，并用它加密字符串，我该怎么做？

谢谢，

Answer 1

经过这么多小时的研究、测试、放弃、再次研究等，对于 .NET 和 Javascript 的 RSA 互操作性的解决方案，我找到了这个库：

http://www.jocys.com/Common/JsClasses/Documents/

它们的类与服务器上的 RSACryptoServiceProvider 具有相同的工作代码。

你必须做的：

1. 从他们的 Github 下载源代码： https ://github.com/JocysCom/JsClasses/archive/master.zip

2. 将文件从 *.debug.js 重命名为 *.js。请参阅下面 (3) 上的文件列表。

3. 将所需文件添加到您的 html 页面

    <script type="text/javascript" src="js/System.js"></script>
    <script type="text/javascript" src="js/System.IO.js"></script>
    <script type="text/javascript" src="js/System.Text.js"></script>
    <script type="text/javascript" src="js/System.Convert.js"></script>
    <script type="text/javascript" src="js/System.BigInt.js"></script>
    <script type="text/javascript" src="js/System.BitConverter.js"></script>
    <script type="text/javascript" src="js/System.Security.Cryptography.js"></script>
    <script type="text/javascript" src="js/System.Security.Cryptography.SHA1.js"></script>
    <script type="text/javascript" src="js/System.Security.Cryptography.HMACSHA1.js"></script>
    <script type="text/javascript" src="js/System.Security.Cryptography.RSA.js"></script>
   

4. 添加此 javascript 代码以加密您的文本：

    function RsaEncrypt()
    {
        //a public key generated from their sample.
        //your should generate yours and stamp it here.
        var xmlParams =
        "<RSAKeyValue>" +
            "<Modulus>pxtmFnrGI6Sb8ziyY+NRUDuQ4b/ETw5WabQ4daFQqzsCEr/6J/LLBU/2D5mO5/Wu5U/Rya1E55aYFZeaZMNqAw==</Modulus>" +
            "<Exponent>AQAB</Exponent>" +
            "<P>2TsVXWPEvDIJv/gd2rX9k0UOyXuaYgoAchIH6vUicis=</P>" +
            "<Q>xO4+OYREQfqYRQK7y73+RaUG0IxobT0OQ0c+Ok2hc4k=</Q>" +
            "<DP>K7/xgpiIU9rECeyfnp/OjS14V+3T3vDivBaTj6eFI3c=</DP>" +
            "<DQ>K4N9ClZ4gp+tn6oP9t//XEIvtEsiE+kmyqTmUhmvMAk=</DQ>" +
            "<InverseQ>p7o4BOlKZQZ693R1ViZ66y5gTjUkNNTd2za7/1YGBCs=</InverseQ>" +
            "<D>XZqFVrYy4qhECruJgVZFp/GVuD5Y0gev88nVjl5r911QT+I8vgJSklTso7jTlpMtf2oe7UZ0WRWEtgPS3tZn4Q==</D>" +
        "</RSAKeyValue>";
        var rsa = new System.Security.Cryptography.RSACryptoServiceProvider();
        rsa.FromXmlString(xmlParams);
   
        // Encrypt
        var decryptedBytes = System.Text.Encoding.UTF8.GetBytes(text);
        var doOaepPadding = true;
        var encryptedBytes = rsa.Encrypt(decryptedBytes, doOaepPadding);
        var encryptedString = System.Convert.ToBase64String(encryptedBytes);
        return encryptedString;
    }
   

查找有关如何生成私钥和公钥的文档（上面的链接）。该代码与您在服务器上手动编写 .NET 完全相同。

你也可以查看他们的测试页面

Answer 2

您还可以在 C# 中以 PEM 格式保存公钥：

private static string ExportPublicKey(RSACryptoServiceProvider csp)
    {
        var parameters = csp.ExportParameters(false);
        using (var stream = new MemoryStream())
        {
            var writer = new BinaryWriter(stream);
            writer.Write((byte)0x30); // SEQUENCE
            using (var innerStream = new MemoryStream())
            {
                var innerWriter = new BinaryWriter(innerStream);
                EncodeIntegerBigEndian(innerWriter, new byte[] { 0x00 }); // Version
                EncodeIntegerBigEndian(innerWriter, parameters.Modulus);
                EncodeIntegerBigEndian(innerWriter, parameters.Exponent);
                EncodeIntegerBigEndian(innerWriter, parameters.Exponent); // instead of parameters.D
                EncodeIntegerBigEndian(innerWriter, parameters.Exponent); // instead of parameters.P
                EncodeIntegerBigEndian(innerWriter, parameters.Exponent); // instead of parameters.Q
                EncodeIntegerBigEndian(innerWriter, parameters.Exponent); // instead of parameters.DP
                EncodeIntegerBigEndian(innerWriter, parameters.Exponent); // instead of parameters.DQ
                EncodeIntegerBigEndian(innerWriter, parameters.Exponent); // instead of parameters.InverseQ
                var length = (int)innerStream.Length;
                EncodeLength(writer, length);
                writer.Write(innerStream.GetBuffer(), 0, length);
            }

            char[] base64 = Convert.ToBase64String(stream.GetBuffer(), 0, (int)stream.Length).ToCharArray();
            StringBuilder res = new StringBuilder();
            res.AppendLine("-----BEGIN RSA PUBLIC KEY-----");
            for (int i = 0; i < base64.Length; i += 64)
            {
                int l = Math.Min(64, base64.Length - i);
                for (int j = 0; j < l; j++) res.Append(base64[i + j]);
                res.AppendLine();
            }
            res.AppendLine("-----END RSA PUBLIC KEY-----");
            return res.ToString();
        }
    }

    private static void EncodeIntegerBigEndian(BinaryWriter stream, byte[] value, bool forceUnsigned = true)
    {
        stream.Write((byte)0x02); // INTEGER
        var prefixZeros = 0;
        for (var i = 0; i < value.Length; i++)
        {
            if (value[i] != 0) break;
            prefixZeros++;
        }
        if (value.Length - prefixZeros == 0)
        {
            EncodeLength(stream, 1);
            stream.Write((byte)0);
        }
        else
        {
            if (forceUnsigned && value[prefixZeros] > 0x7f)
            {
                // Add a prefix zero to force unsigned if the MSB is 1
                EncodeLength(stream, value.Length - prefixZeros + 1);
                stream.Write((byte)0);
            }
            else
            {
                EncodeLength(stream, value.Length - prefixZeros);
            }
            for (var i = prefixZeros; i < value.Length; i++)
            {
                stream.Write(value[i]);
            }
        }
    }

    private static void EncodeLength(BinaryWriter stream, int length)
    {
        if (length < 0) throw new ArgumentOutOfRangeException("length", "Length must be non-negative");
        if (length < 0x80)
        {
            // Short form
            stream.Write((byte)length);
        }
        else
        {
            // Long form
            var temp = length;
            var bytesRequired = 0;
            while (temp > 0)
            {
                temp >>= 8;
                bytesRequired++;
            }
            stream.Write((byte)(bytesRequired | 0x80));
            for (var i = bytesRequired - 1; i >= 0; i--)
            {
                stream.Write((byte)(length >> (8 * i) & 0xff));
            }
        }
    }