public EncryptedPrivateKey(byte[] data)
{
if (data == null)
{
throw new ArgumentNullException("data");
}
var obj = Asn1Object.FromByteArray(data.Skip(16).ToArray());
if (obj is Asn1Sequence seq && seq.Count > 0)
{
if (seq[0] is Asn1Sequence seq2 && seq2.Count >= 2)
{
UKM = (seq2[0] as Asn1OctetString)?.GetOctets();
if (seq2[1] is Asn1Sequence seq3 && seq3.Count >= 2)
{
CEK = (seq3[0] as Asn1OctetString)?.GetOctets();
MAC = (seq3[1] as Asn1OctetString)?.GetOctets();
}
foreach (var tag in seq2.OfType <Asn1TaggedObject>())
{
if (tag.TagNo == 0)
{
KeyParameters = KeyParameters.GetInstance(tag.GetObject());
}
}
}
}
if (UKM == null || CEK == null || MAC == null || KeyParameters == null)
{
throw new CryptographicException("Ошибка в данных PRIVATEKEYBLOB.");
}
}
public HeaderStructure(Asn1Sequence seq)
{
if (seq?.Count > 0 && seq[0] is Asn1Sequence seq2)
{
foreach (Asn1TaggedObject tag in seq2.OfType <Asn1TaggedObject>())
{
switch (tag.TagNo)
{
case 5:
byte[] cert = (tag.GetObject() as Asn1OctetString)?.GetOctets();
Certificate = X509CertificateStructure.GetInstance(cert);
break;
case 6:
cert = (tag.GetObject() as Asn1OctetString)?.GetOctets();
Certificate2 = X509CertificateStructure.GetInstance(cert);
break;
case 10:
PublicX = Asn1OctetString.GetInstance(tag.GetObject())?.GetOctets();
break;
}
}
Asn1Sequence seq3 = seq2?.OfType <Asn1Sequence>().FirstOrDefault();
PrivateKeyParameters = KeyParameters.GetInstance(seq3);
Attributes = seq2?.OfType <DerBitString>().FirstOrDefault();
}
if (seq?.Count > 1)
{
HMACKey = (seq[1] as Asn1OctetString)?.GetOctets();
}
if (HMACKey == null || Attributes == null || PrivateKeyParameters == null || PublicX == null)
{
throw new CryptographicException("Ошибка в данных header.key.");
}
}
private static void PrintPrivateKey(BigInteger pkey, KeyParameters keyParams)
{
var gostParams = Gost3410PublicKeyAlgParameters.GetInstance(keyParams.Algorithm.Parameters);
var pkeyEnc = new DerSequence(
new DerInteger(0),
new DerSequence(
keyParams.Algorithm.Algorithm,
new DerSequence(
gostParams.PublicKeyParamSet,
gostParams.DigestParamSet
)
),
new DerOctetString(new DerInteger(pkey))
);
var pemObject = new PemObject("PRIVATE KEY", pkeyEnc.GetDerEncoded());
using (var sw = new StreamWriter(Console.OpenStandardOutput())) {
var writer = new PemWriter(sw);
writer.WriteObject(pemObject);
}
}