在.NET中加载ECC私钥 [英] Loading an ECC private key in .NET

问题描述

我有一个ECC专用文件和一个包含公用密钥的证书文件。我可以使用PEM或DER格式获取它们。

I have an ECC private and a certificate file which includes the public key. I can get them in either PEM or DER formats.

我可以使用以下代码将证书读入 X509Certificate ：

I can read the certificate into an X509Certificate with this code:

var certbytes = File.ReadAllBytes("certificate.pem");
var cert = new X509Certificate2(certbytes);

但是我无法加载私钥。我尝试了以下代码：

But I'm unable to load the private key. I've tried this code:

var keyContent = File.ReadAllBytes("certificate_private_key.pem");
var key = CngKey.Import(keyContent, CngKeyBlobFormat.EccPrivateBlob);

它抛出 Internal.Cryptography.CryptoThrowHelper.WindowsCryptographicException：'编码或解码操作'。

我还尝试了 CngKeyBlobFormat 参数。

openssl可以读取文件，并输出有关该文件的以下信息：

openssl can read the file, and it outputs the following information about it:

openssl ec -in certificate_private_key.pem -text
read EC key
Private-Key: (256 bit)
priv:
    44:<cut>:68
pub:
    04:<cut>:13
ASN1 OID: prime256v1
NIST CURVE: P-256
writing EC key
-----BEGIN EC PRIVATE KEY-----
MHcC <cut here>
-----END EC PRIVATE KEY-----

是否已构建.NET或.NET Core中的内置API可以做到这一点？还是有第三方库可以做到这一点？怎么做？

Is there built-in API in .NET or .NET Core which can do this? Or are there 3rd party libraries that can do it, and how?

推荐答案

.NET Core 3.0（当前处于预览状态）具有 ECDsa.ImportECPrivateKey ， AsymmetricAlgorithm.ImportPkcs8PrivateKey 和 AsymmetricAlgorithm.ImportEncryptedPkcs8PrivateKey ，（并且RSA具有RSAPublicKey和RSAPrivateKey），对于当前文件（ BEGIN EC私钥），您需要第一个。

.NET Core 3.0 (currently in preview) has ECDsa.ImportECPrivateKey, AsymmetricAlgorithm.ImportPkcs8PrivateKey, and AsymmetricAlgorithm.ImportEncryptedPkcs8PrivateKey, (and RSA has RSAPublicKey and RSAPrivateKey) and for the current file (BEGIN EC PRIVATE KEY) you'd want the first one.

• 这些方法的好消息是：它们存在。


• 的坏消息是：它们是下一版本的一部分，而不是


• 好：下一个版本应尽快成为当前版本。


• 差：他们只了解BER / DER数据，而不了解PEM

• The good news of those methods is: they exist.
• The bad news is: They're part of the next version, not the current one.
• Good: The next version should be the current version soonishly.
• Bad: They only understand BER/DER data, not PEM.

最后一点意味着您当前必须在 ----之间找到base64内容。 -BEGIN EC私钥----- \n 和 \n ----- END EC私钥----- 并de-base64-it，然后将其传递给

The last point means that you currently would have to find the base64 content between the -----BEGIN EC PRIVATE KEY-----\n and \n-----END EC PRIVATE KEY----- and de-base64-it, then pass that into the methods.

我知道CNG导入支持的唯一私钥格式是PKCS8，加密的PKCS8和CNG私人格式。要使用CngKey.Import，您首先需要将密钥文件转换为PKCS＃8，然后指定格式为 Pkcs8PrivateBlob ，如注释中所建议。

The only private key formats that I know that are supported by CNG import are PKCS8, encrypted PKCS8, and CNG private formats. To use CngKey.Import you'd first need to convert the keyfile to PKCS#8 then specify that the format is Pkcs8PrivateBlob, as suggested in the comments.

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