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handle offline signature for Datagram2
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orignal 2025-07-26 16:05:57 -04:00
parent d5769080c8
commit f1ca24fec2
1 changed files with 25 additions and 17 deletions
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40
libi2pd/Datagram.cpp
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@ -195,30 +195,38 @@ 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); uint16_t flags = bufbe16toh (buf + identityLen);
size_t offset = identityLen + 2; size_t offset = identityLen + 2;
if (flags & DATAGRAM2_FLAG_OPTIONS) if (flags & DATAGRAM2_FLAG_OPTIONS)
offset += bufbe16toh (buf + offset) + 2; 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; return;
} }
if (flags & DATAGRAM2_FLAG_OFFLINE_SIGNATURE) if (!verified)
{ {
LogPrint (eLogWarning, "Datagram: datagram2 offline signature is not supported"); std::shared_ptr<i2p::crypto::Verifier> transientVerifier;
return; 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()); auto session = ObtainSession (identity.GetIdentHash());