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use common context for ElGamal encrypt/decrypt

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This commit is contained in:
orignal 2017-03-11 16:48:54 -05:00
parent 4bb607f180
commit c0c157ecef
7 changed files with 27 additions and 19 deletions
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8
Crypto.cpp
View file

@ -272,9 +272,8 @@ namespace crypto
}
// ElGamal
void ElGamalEncrypt (const uint8_t * key, const uint8_t * data, uint8_t * encrypted, bool zeroPadding)
void ElGamalEncrypt (const uint8_t * key, const uint8_t * data, uint8_t * encrypted, BN_CTX * ctx, bool zeroPadding)
{
BN_CTX * ctx = BN_CTX_new ();
BN_CTX_start (ctx);
// everything, but a, because a might come from table
BIGNUM * k = BN_CTX_get (ctx);
@ -324,13 +323,11 @@ namespace crypto
}
BN_free (a);
BN_CTX_end (ctx);
BN_CTX_free (ctx);
}
bool ElGamalDecrypt (const uint8_t * key, const uint8_t * encrypted,
uint8_t * data, bool zeroPadding)
uint8_t * data, BN_CTX * ctx, bool zeroPadding)
{
BN_CTX * ctx = BN_CTX_new ();
BN_CTX_start (ctx);
BIGNUM * x = BN_CTX_get (ctx), * a = BN_CTX_get (ctx), * b = BN_CTX_get (ctx);
BN_bin2bn (key, 256, x);
@ -343,7 +340,6 @@ namespace crypto
uint8_t m[255];
bn2buf (b, m, 255);
BN_CTX_end (ctx);
BN_CTX_free (ctx);
uint8_t hash[32];
SHA256 (m + 33, 222, hash);
if (memcmp (m + 1, hash, 32))

4
Crypto.h
View file

@ -48,8 +48,8 @@ namespace crypto
};
// ElGamal
void ElGamalEncrypt (const uint8_t * key, const uint8_t * data, uint8_t * encrypted, bool zeroPadding = false);
bool ElGamalDecrypt (const uint8_t * key, const uint8_t * encrypted, uint8_t * data, bool zeroPadding = false);
void ElGamalEncrypt (const uint8_t * key, const uint8_t * data, uint8_t * encrypted, BN_CTX * ctx, bool zeroPadding = false);
bool ElGamalDecrypt (const uint8_t * key, const uint8_t * encrypted, uint8_t * data, BN_CTX * ctx, bool zeroPadding = false);
void GenerateElGamalKeyPair (uint8_t * priv, uint8_t * pub);
// HMAC

11
Garlic.cpp
View file

@ -187,7 +187,8 @@ namespace garlic
RAND_bytes (elGamal.preIV, 32); // Pre-IV
uint8_t iv[32]; // IV is first 16 bytes
SHA256(elGamal.preIV, 32, iv);
i2p::crypto::ElGamalEncrypt (m_Destination->GetEncryptionPublicKey (), (uint8_t *)&elGamal, buf, true);
i2p::crypto::ElGamalEncrypt (m_Destination->GetEncryptionPublicKey (),
(uint8_t *)&elGamal, buf, m_Owner->GetBNContext (), true);
m_Encryption.SetIV (iv);
buf += 514;
len += 514;
@ -389,8 +390,14 @@ namespace garlic
return size;
}
GarlicDestination::GarlicDestination (): m_NumTags (32) // 32 tags by default
{
m_Ctx = BN_CTX_new ();
}
GarlicDestination::~GarlicDestination ()
{
BN_CTX_free (m_Ctx);
}
void GarlicDestination::CleanUp ()
@ -446,7 +453,7 @@ namespace garlic
{
// tag not found. Use ElGamal
ElGamalBlock elGamal;
if (length >= 514 && i2p::crypto::ElGamalDecrypt (GetEncryptionPrivateKey (), buf, (uint8_t *)&elGamal, true))
if (length >= 514 && i2p::crypto::ElGamalDecrypt (GetEncryptionPrivateKey (), buf, (uint8_t *)&elGamal, m_Ctx, true))
{
auto decryption = std::make_shared<i2p::crypto::CBCDecryption>();
decryption->SetKey (elGamal.sessionKey);

4
Garlic.h
View file

@ -153,11 +153,12 @@ namespace garlic
{
public:
GarlicDestination (): m_NumTags (32) {}; // 32 tags by default
GarlicDestination ();
~GarlicDestination ();
void CleanUp ();
void SetNumTags (int numTags) { m_NumTags = numTags; };
BN_CTX * GetBNContext () const { return m_Ctx; };
std::shared_ptr<GarlicRoutingSession> GetRoutingSession (std::shared_ptr<const i2p::data::RoutingDestination> destination, bool attachLeaseSet);
void CleanupExpiredTags ();
void RemoveDeliveryStatusSession (uint32_t msgID);
@ -189,6 +190,7 @@ namespace garlic
private:
BN_CTX * m_Ctx;
// outgoing sessions
int m_NumTags;
std::mutex m_SessionsMutex;

5
I2NPProtocol.cpp
View file

@ -326,8 +326,9 @@ namespace i2p
if (!memcmp (record + BUILD_REQUEST_RECORD_TO_PEER_OFFSET, (const uint8_t *)i2p::context.GetRouterInfo ().GetIdentHash (), 16))
{
LogPrint (eLogDebug, "I2NP: Build request record ", i, " is ours");
i2p::crypto::ElGamalDecrypt (i2p::context.GetEncryptionPrivateKey (), record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET, clearText);
BN_CTX * ctx = BN_CTX_new ();
i2p::crypto::ElGamalDecrypt (i2p::context.GetEncryptionPrivateKey (), record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET, clearText, ctx);
BN_CTX_free (ctx);
// replace record to reply
if (i2p::context.AcceptsTunnels () &&
i2p::tunnel::tunnels.GetTransitTunnels ().size () <= g_MaxNumTransitTunnels &&

4
Tunnel.cpp
View file

@ -51,6 +51,7 @@ namespace tunnel
uint8_t * records = msg->GetPayload () + 1;
TunnelHopConfig * hop = m_Config->GetFirstHop ();
int i = 0;
BN_CTX * ctx = BN_CTX_new ();
while (hop)
{
uint32_t msgID;
@ -59,7 +60,7 @@ namespace tunnel
else
msgID = replyMsgID;
int idx = recordIndicies[i];
hop->CreateBuildRequestRecord (records + idx*TUNNEL_BUILD_RECORD_SIZE, msgID);
hop->CreateBuildRequestRecord (records + idx*TUNNEL_BUILD_RECORD_SIZE, msgID, ctx);
hop->recordIndex = idx;
i++;
#ifdef WITH_EVENTS
@ -67,6 +68,7 @@ namespace tunnel
#endif
hop = hop->next;
}
BN_CTX_free (ctx);
#ifdef WITH_EVENTS
EmitTunnelEvent("tunnel.build", this, peers);
#endif

4
TunnelConfig.h
View file

@ -83,7 +83,7 @@ namespace tunnel
}
}
void CreateBuildRequestRecord (uint8_t * record, uint32_t replyMsgID) const
void CreateBuildRequestRecord (uint8_t * record, uint32_t replyMsgID, BN_CTX * ctx) const
{
uint8_t clearText[BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE];
htobe32buf (clearText + BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET, tunnelID);
@ -101,7 +101,7 @@ namespace tunnel
htobe32buf (clearText + BUILD_REQUEST_RECORD_REQUEST_TIME_OFFSET, i2p::util::GetHoursSinceEpoch ());
htobe32buf (clearText + BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET, replyMsgID);
RAND_bytes (clearText + BUILD_REQUEST_RECORD_PADDING_OFFSET, BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE - BUILD_REQUEST_RECORD_PADDING_OFFSET);
i2p::crypto::ElGamalEncrypt (ident->GetEncryptionPublicKey (), clearText, record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET);
i2p::crypto::ElGamalEncrypt (ident->GetEncryptionPublicKey (), clearText, record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET, ctx);
memcpy (record + BUILD_REQUEST_RECORD_TO_PEER_OFFSET, (const uint8_t *)ident->GetIdentHash (), 16);
}
};