CODEWITHSUNDEEP
.netencodingcryptographyecdsakey-pair
santiPipes
santiPipes

Reputation: 61

ECDSA keys storing

I am implementing ECDSA keys and certificates in .NET, and I need to store the keys so that I can reuse them with a new signing. With RSA I was using the class RSACryptoServiceProvider, but I don't see anything similar with ECDsa neither ECDsaCng classes.

I only have seen DSACryptoServiceProvider and one old ECDsaCryptoServiceProvider to Framework 4.3 (a bit old).

Does anyone know a way to store ECDSA keys as in RSA, please?

Upvotes: 1

Views: 1261

Answers (1)

bartonjs
bartonjs

Reputation: 33286

Assuming that you mean you would like to persist a key into the OS key store (RSACryptoServiceProvider using a named key), with CNG the interface is a little different:

private static ECDsa CreateOrOpenECDsaKey(string keyName)
{
    CngKey key;

    if (CngKey.Exists(keyName))
    {
        key = CngKey.Open(keyName);
    }
    else
    {
        // You can also specify options here, like if it should be exportable, in a
        // different overload.
        key = CngKey.Create(CngAlgorithm.ECDsaP521, keyName);
    }

    // The ECDsaCng constructor will duplicate the key reference, so we can close this one.
    using (key)
    {
        return new ECDsaCng(key);
    }
}

If you meant you want to do export/import like RSAParameters, that feature is present in .NET Core, but isn't yet present in .NET Framework.

Upvotes: 3

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