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handle offline signature for Datagram2

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orignal committed 2025-07-26 16:05:57 -04:00
1 parent d5769080c8
commit f1ca24fec2
1 file changed
+25 -17
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libi2pd/Datagram.cpp
+25 -17
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@@ -195,31 +195,39 @@ namespace datagram
}
}
}
if (!verified)
{
std::vector<uint8_t> signedData (len + 32 - identityLen - signatureLen);
memcpy (signedData.data (), identity.GetIdentHash (), 32);
memcpy (signedData.data () + 32, buf + identityLen, signedData.size () - 32);
if (!identity.Verify (signedData.data (), signedData.size (), buf + len - signatureLen))
{
LogPrint (eLogWarning, "Datagram: datagram2 signature verification failed");
return;
}
}
uint16_t flags = bufbe16toh (buf + identityLen);
size_t offset = identityLen + 2;
if (flags & DATAGRAM2_FLAG_OPTIONS)
offset += bufbe16toh (buf + offset) + 2;
if (offset > len - signatureLen)
if (offset > len)
{
LogPrint (eLogWarning, "Datagram: datagram2 is too short ", len - signatureLen, " expected ", offset);
LogPrint (eLogWarning, "Datagram: datagram2 is too short ", len, " expected ", offset);
return;
}
if (flags & DATAGRAM2_FLAG_OFFLINE_SIGNATURE)
if (!verified)
{
LogPrint (eLogWarning, "Datagram: datagram2 offline signature is not supported");
return;
}
std::shared_ptr<i2p::crypto::Verifier> transientVerifier;
if (flags & DATAGRAM2_FLAG_OFFLINE_SIGNATURE)
{
transientVerifier = i2p::data::ProcessOfflineSignature (&identity, buf, len, offset);
if (!transientVerifier)
{
LogPrint (eLogWarning, "Datagram: datagram2 offline signature failed");
return;
}
signatureLen = transientVerifier->GetSignatureLen ();
}
std::vector<uint8_t> signedData (len + 32 - identityLen - signatureLen);
memcpy (signedData.data (), identity.GetIdentHash (), 32);
memcpy (signedData.data () + 32, buf + identityLen, signedData.size () - 32);
verified = transientVerifier ? transientVerifier->Verify (signedData.data (), signedData.size (), buf + len - signatureLen) :
identity.Verify (signedData.data (), signedData.size (), buf + len - signatureLen);
if (!verified)
{
LogPrint (eLogWarning, "Datagram: datagram2 signature verification failed");
return;
}
}
auto session = ObtainSession (identity.GetIdentHash());
session->SetVersion (eDatagramV2);