public override void Decode(Asn1BerDecodeBuffer buffer, bool explicitTagging, int implicitLength)
{
var elemLength = explicitTagging ? MatchTag(buffer, Asn1Tag.Sequence) : implicitLength;
EncryptionParamSet = 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(0, 0, OctetStringTypeCode, parsedLen, false))
{
Ukm = new Asn1OctetString();
Ukm.Decode(buffer, true, parsedLen.Value);
if (Ukm.Length != 8)
{
throw ExceptionUtility.CryptographicException(Resources.Asn1ConsVioException, nameof(Ukm.Length), Ukm.Length);
}
}
}
/// <summary>
/// Расшифровать информацию о ключе.
/// </summary>
public byte[] Encode()
{
byte[] data;
var keyWrap = new Gost_28147_89_KeyWrap();
try
{
keyWrap.EncryptedKey = new Gost_28147_89_EncryptedKey
{
EncryptedKey = new Gost_28147_89_Key(EncryptedKey),
MacKey = new Gost_28147_89_Mac(Mac)
};
keyWrap.EncryptedParams = new Gost_28147_89_KeyWrapParams
{
EncryptionParamSet = Gost_28147_89_ParamSet.FromString(EncryptionParamSet),
Ukm = new Asn1OctetString(Ukm)
};
var asnEncoder = new Asn1BerEncodeBuffer();
keyWrap.Encode(asnEncoder);
data = asnEncoder.MsgCopy;
}
catch (Exception exception)
{
throw ExceptionUtility.CryptographicException(exception, Resources.Asn1DecodeError, nameof(Gost_28147_89_KeyWrap));
}
return(data);
}
/// <summary>
/// Зашифровать идентификатор OID параметров шифрования.
/// </summary>
public static byte[] EncodeEncryptionParamSet(string encryptionParamSet)
{
if (encryptionParamSet == null)
{
throw ExceptionUtility.ArgumentNull(nameof(encryptionParamSet));
}
byte[] data;
try
{
var parameters = new Gost_28147_89_BlobParams {
EncryptionParamSet = Gost_28147_89_ParamSet.FromString(encryptionParamSet)
};
var asnEncoder = new Asn1BerEncodeBuffer();
parameters.Encode(asnEncoder);
data = asnEncoder.MsgCopy;
}
catch (Exception exception)
{
throw ExceptionUtility.CryptographicException(exception, Resources.Asn1EncodeError, nameof(Gost_28147_89_BlobParams));
}
return(data);
}
public override void Decode(Asn1BerDecodeBuffer buffer, bool explicitTagging, int implicitLength)
{
var elemLength = explicitTagging ? MatchTag(buffer, Asn1Tag.Sequence) : implicitLength;
EncryptionParamSet = null;
ExtElement = 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.Expired())
{
if (buffer.PeekTag().Equals(0, 0, ObjectIdentifierTypeCode))
{
throw ExceptionUtility.CryptographicException(Resources.Asn1SeqOrderException);
}
ExtElement = new Asn1OpenExt();
while (!context.Expired())
{
ExtElement.DecodeComponent(buffer);
}
}
else
{
ExtElement = null;
}
}
