private Pair <Chain, uint> getReceiverChain(ECPublicKey senderEphemeral)
{
IList <Chain> receiverChains = sessionStructure.ReceiverChainsList;
uint index = 0;
foreach (Chain receiverChain in receiverChains)
{
try
{
ECPublicKey chainSenderRatchetKey = Curve.decodePoint(receiverChain.SenderRatchetKey.ToByteArray(), 0);
if (chainSenderRatchetKey.Equals(senderEphemeral))
{
return(new Pair <Chain, uint>(receiverChain, index));
}
}
catch (InvalidKeyException e)
{
Debug.WriteLine(e.ToString(), "SessionRecordV2");
}
index++;
}
return(null);
}
public override bool Equals(Object other)
{
if (other == null)
{
return(false);
}
if (!(other is IdentityKey))
{
return(false);
}
return(publicKey.Equals(((IdentityKey)other).getPublicKey()));
}
static ECPrivateKey DecodePrivateKeyEC(AsnElt ak, ECCurve curve)
{
ak.CheckNumSubMin(2);
ak.GetSub(0).CheckTag(AsnElt.INTEGER);
ak.GetSub(1).CheckTag(AsnElt.OCTET_STRING);
long kt = ak.GetSub(0).GetInteger();
if (kt != 1)
{
throw new AsnException(
"Unsupported EC key type: " + kt);
}
byte[] x = ak.GetSub(1).CopyValue();
byte[] pub = null;
int n = ak.Sub.Length;
int p = 2;
if (p < n)
{
AsnElt acc = ak.GetSub(p);
if (acc.TagClass == AsnElt.CONTEXT &&
acc.TagValue == 0)
{
acc.CheckNumSub(1);
acc = acc.GetSub(0);
ECCurve curve2 = DecodeCurve(acc);
/*
* Here, we support only named curves.
*/
/* obsolete
*/
if (curve == null)
{
curve = curve2;
}
else if (!curve.Equals(curve2))
{
throw new AsnException(string.Format(
"Inconsistent curve"
+ " specification ({0} / {1})",
curve.Name, curve2.Name));
}
p++;
}
}
if (p < n)
{
AsnElt acc = ak.GetSub(p);
if (acc.TagClass == AsnElt.CONTEXT &&
acc.TagValue == 1)
{
acc.CheckNumSub(1);
acc = acc.GetSub(0);
acc.CheckTag(AsnElt.BIT_STRING);
pub = acc.GetBitString();
}
}
if (curve == null)
{
throw new AsnException("No curve specified for EC key");
}
ECPrivateKey esk = new ECPrivateKey(curve, x);
if (pub != null)
{
ECPublicKey epk = new ECPublicKey(curve, pub);
if (!epk.Equals(esk.PublicKey))
{
throw new CryptoException(
"EC key pair public/private mismatch");
}
}
return(esk);
}