Bouncy Castle，RSA：将密钥转换为字符串格式

发布于 2024-10-19 05:15:04 字数 637 浏览 7 评论 0原文

我在我的 C# 项目中使用 RSA (Bouncy Castle API)。我用这种方法生成了密钥对：

RsaKeyPairGenerator r = new RsaKeyPairGenerator();
r.Init(new KeyGenerationParameters(new SecureRandom(), 1024));
AsymmetricCipherKeyPair keys = r.GenerateKeyPair();

AsymmetricKeyParameter private_key = keys.Private;
AsymmetricKeyParameter public_key = keys.Public;

现在我想将它们保存在txt文件中，但问题是我无法将它们转换为字符串格式。我在另一篇文章中读到密钥必须使用以下方式序列化：

PrivateKeyInfo k = PrivateKeyInfoFactory.CreatePrivateKeyInfo(private_key);
byte[] serializedKey = k.ToAsn1Object().GetDerEncoded();

这是正确的方法吗？如果是，之后我应该做什么？只是将它们从 byte[] 转换为 String 吗？

原文

I'm using RSA (Bouncy Castle API) in my C# project. I generated the keypair with this method:

RsaKeyPairGenerator r = new RsaKeyPairGenerator();
r.Init(new KeyGenerationParameters(new SecureRandom(), 1024));
AsymmetricCipherKeyPair keys = r.GenerateKeyPair();

AsymmetricKeyParameter private_key = keys.Private;
AsymmetricKeyParameter public_key = keys.Public;

Now I want to save them in a txt file but the problem is that I can't convert them to a string format. I read in another post that keys must be serialized using:

PrivateKeyInfo k = PrivateKeyInfoFactory.CreatePrivateKeyInfo(private_key);
byte[] serializedKey = k.ToAsn1Object().GetDerEncoded();

Is it the right way? If yes, what should I do after this? Just convert them from byte[] to String?

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一花一树开 2024-10-26 05:15:04

您还可以使用 PemWriter 将它们存储为 PEM 格式：

TextWriter textWriter = new StringWriter();
PemWriter pemWriter = new PemWriter(textWriter);
pemWriter.WriteObject(keys.Private);
pemWriter.Writer.Flush();

string privateKey = textWriter.ToString();

现在 privateKey 包含如下内容：

You could also use PemWriter to store them in PEM format:

TextWriter textWriter = new StringWriter();
PemWriter pemWriter = new PemWriter(textWriter);
pemWriter.WriteObject(keys.Private);
pemWriter.Writer.Flush();

string privateKey = textWriter.ToString();

Now privateKey contain something like this:

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冧九 2024-10-26 05:15:04

好吧，我不知道 RSA 特定的方面，但是一旦你有了一个不透明的二进制字符串（即它可以包含任何任意数据），文本转换的最佳选择是 Convert.ToBase64String(byte[]) 您可以使用 Convert.FromBase64String(string)。

不要为此使用 Encoding.GetString(byte[]) 和 Encoding.GetBytes(string) - 二进制数据不是' t 特定编码中的文本，不应如此对待。如果您尝试这样做，您几乎肯定会丢失数据。

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滴情不沾 2024-10-26 05:15:04

这可能就是您正在寻找的：
http ://www.rahulsingla.com/blog/2011/04/serializing-deserializing-rsa-public-private-keys- generated-using-bounty-castle-library

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非要怀念 2024-10-26 05:15:04

尝试以下操作

        RsaKeyPairGenerator rsaKeyPairGenerator = new RsaKeyPairGenerator();
        rsaKeyPairGenerator.Init(new KeyGenerationParameters(new SecureRandom(), XXX));

        AsymmetricCipherKeyPair keys = rsaKeyPairGenerator.GenerateKeyPair();

        PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(keys.Private);
        // Write out an RSA private key with it's asscociated information as described in PKCS8.
        byte[] serializedPrivateBytes = privateKeyInfo.ToAsn1Object().GetDerEncoded();
        // Convert to Base64 ..
        string serializedPrivateString = Convert.ToBase64String(serializedPrivateBytes);

        SubjectPublicKeyInfo publicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(keys.Public);
        byte[] serializedPublicBytes = publicKeyInfo.ToAsn1Object().GetDerEncoded();
        string serializedPublicString = Convert.ToBase64String(serializedPublicBytes);

Try the following

        RsaKeyPairGenerator rsaKeyPairGenerator = new RsaKeyPairGenerator();
        rsaKeyPairGenerator.Init(new KeyGenerationParameters(new SecureRandom(), XXX));

        AsymmetricCipherKeyPair keys = rsaKeyPairGenerator.GenerateKeyPair();

        PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(keys.Private);
        // Write out an RSA private key with it's asscociated information as described in PKCS8.
        byte[] serializedPrivateBytes = privateKeyInfo.ToAsn1Object().GetDerEncoded();
        // Convert to Base64 ..
        string serializedPrivateString = Convert.ToBase64String(serializedPrivateBytes);

        SubjectPublicKeyInfo publicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(keys.Public);
        byte[] serializedPublicBytes = publicKeyInfo.ToAsn1Object().GetDerEncoded();
        string serializedPublicString = Convert.ToBase64String(serializedPublicBytes);

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源来凯始玺欢你 2024-10-26 05:15:04

如果将 bouncycastle 证书转换为 .net 证书。执行此操作的函数位于 bouncycastle 库中（我相信它位于名为 DotNetUtilities 的类中）。 RSACryptoServiceProvider 有一个函数：

ToXmlString(bool includePrivateKey).

如果您希望包含单独序列化为 Base64 的所有组件的私钥、指数、模数和 d（私有指数），它会为您提供证书的 x 表示形式。

If you convert the bouncycastle certificate to a .net certificate. The function to do this is in the bouncycastle lib (i believe it's in a class called DotNetUtilities). The RSACryptoServiceProvider has a function:

ToXmlString(bool includePrivateKey).

Which gives you an x representation of a certificate with if you want the private key containing all the components serialized to base64 seperately, exponent, modulus, and d (private exponent).

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