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common code for offline signatures

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orignal 2019-02-06 13:36:03 -05:00
parent f5f4190803
commit 2cac9b03ff
4 changed files with 57 additions and 62 deletions
libi2pd
LeaseSet.h

29
libi2pd/LeaseSet.h
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@ -8,6 +8,7 @@
#include <memory>
#include "Identity.h"
#include "Timestamp.h"
#include "I2PEndian.h"
namespace i2p
{
@ -77,7 +78,8 @@ namespace data
bool operator== (const LeaseSet& other) const
{ return m_BufferLen == other.m_BufferLen && !memcmp (m_Buffer, other.m_Buffer, m_BufferLen); };
virtual uint8_t GetStoreType () const { return NETDB_STORE_TYPE_LEASESET; };
virtual std::shared_ptr<const i2p::crypto::Verifier> GetTransientVerifier () const { return nullptr; };
// implements RoutingDestination
std::shared_ptr<const IdentityEx> GetIdentity () const { return m_Identity; };
void Encrypt (const uint8_t * data, uint8_t * encrypted, BN_CTX * ctx) const;
@ -128,8 +130,9 @@ namespace data
LeaseSet2 (uint8_t storeType, const uint8_t * buf, size_t len, bool storeLeases = true);
uint8_t GetStoreType () const { return m_StoreType; };
std::shared_ptr<const i2p::crypto::Verifier> GetTransientVerifier () const { return m_TransientVerifier; };
void Update (const uint8_t * buf, size_t len, bool verifySignature);
// implements RoutingDestination
void Encrypt (const uint8_t * data, uint8_t * encrypted, BN_CTX * ctx) const;
@ -148,9 +151,31 @@ namespace data
private:
uint8_t m_StoreType;
std::shared_ptr<i2p::crypto::Verifier> m_TransientVerifier;
std::shared_ptr<i2p::crypto::CryptoKeyEncryptor> m_Encryptor; // for standardLS2
};
// also called from Streaming.cpp
template<typename Verifier>
std::shared_ptr<i2p::crypto::Verifier> ProcessOfflineSignature (const Verifier& verifier, const uint8_t * buf, size_t len, size_t& offset)
{
if (offset + 6 >= len) return nullptr;
const uint8_t * signedData = buf + offset;
uint32_t expiresTimestamp = bufbe32toh (buf + offset); offset += 4; // expires timestamp
if (expiresTimestamp < i2p::util::GetSecondsSinceEpoch ()) return nullptr;
uint16_t keyType = bufbe16toh (buf + offset); offset += 2;
std::shared_ptr<i2p::crypto::Verifier> transientVerifier (i2p::data::IdentityEx::CreateVerifier (keyType));
if (!transientVerifier) return nullptr;
auto keyLen = transientVerifier->GetPublicKeyLen ();
if (offset + keyLen >= len) return nullptr;
transientVerifier->SetPublicKey (buf + offset); offset += keyLen;
if (offset + verifier->GetSignatureLen () >= len) return nullptr;
if (!verifier->Verify (signedData, keyLen + 6, buf + offset)) return nullptr;
offset += verifier->GetSignatureLen ();
return transientVerifier;
}
//------------------------------------------------------------------------------------
class LocalLeaseSet
{
public: