private SubjectPublicKeyInfo EncodePublicKey(Gost_R3410_KeyExchangeParams transportParameters)
{
var asnEncoder = new Asn1BerEncodeBuffer();
var publicKey = new Asn1OctetString(transportParameters.PublicKey);
publicKey.Encode(asnEncoder);
var publicKeyValue = asnEncoder.MsgCopy;
var publicKeyInfo = new SubjectPublicKeyInfo
{
SubjectPublicKey = new Asn1BitString(publicKeyValue.Length * 8, publicKeyValue)
};
var publicKeyParams = CreatePublicKeyParams();
publicKeyParams.PublicKeyParamSet = new Asn1ObjectIdentifier(OidValue.FromString(transportParameters.PublicKeyParamSet));
publicKeyParams.DigestParamSet = new Asn1ObjectIdentifier(OidValue.FromString(transportParameters.DigestParamSet));
publicKeyParams.EncryptionParamSet = Gost_28147_89_ParamSet.FromString(transportParameters.EncryptionParamSet);
asnEncoder.Reset();
publicKeyParams.Encode(asnEncoder);
var publicKeyAlgOid = new Asn1ObjectIdentifier(KeyAlgorithm);
publicKeyInfo.Algorithm = new AlgorithmIdentifier(publicKeyAlgOid, new Asn1OpenType(asnEncoder.MsgCopy));
return(publicKeyInfo);
}
/// <summary>
/// Зашифровать информацию о ключе.
/// </summary>
public byte[] Encode()
{
var asnEncoder = new Asn1BerEncodeBuffer();
var keyTransport = new Gost_R3410_KeyTransport();
try
{
keyTransport.SessionEncryptedKey = new Gost_28147_89_EncryptedKey
{
EncryptedKey = new Gost_28147_89_Key(SessionEncryptedKey.EncryptedKey),
MacKey = new Gost_28147_89_Mac(SessionEncryptedKey.Mac)
};
keyTransport.TransportParams = new Gost_R3410_TransportParams
{
EncryptionParamSet = Gost_28147_89_ParamSet.FromString(SessionEncryptedKey.EncryptionParamSet),
EphemeralPublicKey = EncodePublicKey(TransportParameters),
Ukm = new Asn1OctetString(SessionEncryptedKey.Ukm)
};
keyTransport.Encode(asnEncoder);
}
catch (Exception exception)
{
throw ExceptionUtility.CryptographicException(exception, Resources.Asn1EncodeError, nameof(Gost_R3410_KeyTransport));
}
return(asnEncoder.MsgCopy);
}
public override void Decode(Asn1BerDecodeBuffer buffer, bool explicitTagging, int implicitLength)
{
var elemLength = explicitTagging ? MatchTag(buffer, Asn1Tag.Sequence) : implicitLength;
DigestParamSet = null;
PublicKeyParamSet = null;
EncryptionParamSet = null;
var context = new Asn1BerDecodeContext(buffer, elemLength);
var parsedLen = new IntHolder();
if (!context.MatchElemTag(0, 0, ObjectIdentifierTypeCode, parsedLen, false))
{
throw ExceptionUtility.CryptographicException(Resources.Asn1MissingRequiredException, buffer.ByteCount);
}
PublicKeyParamSet = new Asn1ObjectIdentifier();
PublicKeyParamSet.Decode(buffer, true, parsedLen.Value);
if (!context.MatchElemTag(0, 0, ObjectIdentifierTypeCode, parsedLen, false))
{
throw ExceptionUtility.CryptographicException(Resources.Asn1MissingRequiredException, buffer.ByteCount);
}
DigestParamSet = new Asn1ObjectIdentifier();
DigestParamSet.Decode(buffer, true, parsedLen.Value);
if (context.MatchElemTag(0, 0, ObjectIdentifierTypeCode, parsedLen, false))
{
EncryptionParamSet = new Gost_28147_89_ParamSet();
EncryptionParamSet.Decode(buffer, true, parsedLen.Value);
}
}
/// <summary>
/// Зашифровать параметры.
/// </summary>
public byte[] EncodeParameters()
{
byte[] data;
try
{
var publicKeyParams = CreatePublicKeyParams();
publicKeyParams.DigestParamSet = new Asn1ObjectIdentifier(OidValue.FromString(DigestParamSet));
publicKeyParams.PublicKeyParamSet = new Asn1ObjectIdentifier(OidValue.FromString(PublicKeyParamSet));
publicKeyParams.EncryptionParamSet = Gost_28147_89_ParamSet.FromString(EncryptionParamSet);
var asnEncoder = new Asn1BerEncodeBuffer();
publicKeyParams.Encode(asnEncoder);
data = asnEncoder.MsgCopy;
}
catch (Exception exception)
{
throw ExceptionUtility.CryptographicException(exception, Resources.Asn1EncodeError, nameof(Gost_R3410_PublicKeyParams));
}
return(data);
}
public override void Decode(Asn1BerDecodeBuffer buffer, bool explicitTagging, int implicitLength)
{
var elemLength = explicitTagging ? MatchTag(buffer, Asn1Tag.Sequence) : implicitLength;
EncryptionParamSet = null;
EphemeralPublicKey = null;
Ukm = null;
var context = new Asn1BerDecodeContext(buffer, elemLength);
var parsedLen = new IntHolder();
if (!context.MatchElemTag(0, 0, ObjectIdentifierTypeCode, parsedLen, false))
{
throw ExceptionUtility.CryptographicException(Resources.Asn1MissingRequiredException, buffer.ByteCount);
}
EncryptionParamSet = new Gost_28147_89_ParamSet();
EncryptionParamSet.Decode(buffer, true, parsedLen.Value);
if (context.MatchElemTag(0x80, 0x20, EocTypeCode, parsedLen, true))
{
EphemeralPublicKey = new SubjectPublicKeyInfo();
EphemeralPublicKey.Decode(buffer, false, parsedLen.Value);
}
if (!context.MatchElemTag(0, 0, OctetStringTypeCode, parsedLen, false))
{
throw ExceptionUtility.CryptographicException(Resources.Asn1MissingRequiredException, buffer.ByteCount);
}
Ukm = new Asn1OctetString();
Ukm.Decode(buffer, true, parsedLen.Value);
if (Ukm.Length != 8)
{
throw ExceptionUtility.CryptographicException(Resources.Asn1ConsVioException, nameof(Ukm.Length), Ukm.Length);
}
}
