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Алгоритм подписи ГОСТ: Р 34.11/34.10-2001
Алгоритм хэширования подписи: ГОСТ Р 34.11-94
Открытый ключ: ГОСТ Р 34.10-2001(512 Bits)
Есть закрытый ключи для этого сертификата
Отпечаток: ‎47 0a 6e b0 38 2e 70 e1 91 4c 98 ba e3 ee 4f e3 97 d3 64 a1
Серийник: ‎94 3b 17 cd 26 a7 be 00

var a = (CryptoPro.Sharpei.Gost3410CryptoServiceProvider)sert.PrivateKey;

byte[] Sign(byte[] data, X509Certificate2 signingCert)
{
    // create ContentInfo
    ContentInfo content = new ContentInfo(data);

    // SignedCms represents signed data
    SignedCms signedMessage = new SignedCms(content);

    // create a signer
    CmsSigner signer = new CmsSigner(signingCert);

    // sign the data
    signedMessage.ComputeSignature(signer);

    // create PKCS #7 byte array
    byte[] signedBytes = signedMessage.Encode();

    // return signed data
    return signedBytes;
}

byte[] Encrypt(byte[] data, X509Certificate2 encryptingCert)
{
    // create ContentInfo
    ContentInfo plainContent = new ContentInfo(data);

    // EnvelopedCms represents encrypted data
    EnvelopedCms encryptedData = new EnvelopedCms(plainContent);

    // add a recipient
    CmsRecipient recipient = new CmsRecipient(encryptingCert);

    // encrypt data with public key of recipient
    encryptedData.Encrypt(recipient);

    // create PKCS #7 byte array
    byte[] encryptedBytes = encryptedMessage.Encode();

    // return encrypted data
    return encryptedBytes;
}

byte[] Sign(byte[] data, X509Certificate2 signingCert)
byte[] Encrypt(byte[] data, X509Certificate2 encryptingCert)

            string retVal = "";
            IntPtr hCryptoProvider = IntPtr.Zero;
            IntPtr hPubKey = IntPtr.Zero;
            IntPtr hHash = IntPtr.Zero;
                ...               

                if (!Crypt32Wrapper.CryptAcquireContext(out hCryptoProvider, containerName, null, TYPE, 0))
                ...               
                int code = Crypt32Wrapper.CryptGetUserKey(hCryptoProvider, Crypt32Wrapper.AT_SIGNATURE, ref hPubKey);
                ...
                if (!Crypt32Wrapper.CryptCreateHash(hCryptoProvider, CERT_ALG_ID, IntPtr.Zero, 0, out hHash))
                ...
                byte[] buffer = encoding.GetBytes(toSign);
                if (!Crypt32Wrapper.CryptHashData(hHash, buffer, buffer.Length, 0))
                ...
                uint signatureLength = 0;
                if (!Crypt32Wrapper.CryptSignHash(hHash, Crypt32Wrapper.AT_KEYEXCHANGE, null, 0, null, ref signatureLength))
                ...
                byte[] signature = new byte[signatureLength];
                if (!Crypt32Wrapper.CryptSignHash(hHash, Crypt32Wrapper.AT_KEYEXCHANGE, null, 0, signature, ref signatureLength))

                retVal = Convert.ToBase64String(signature, 0, (int)signatureLength);