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Code Issues Releases Activity

signature size for SessionCreated

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orignal 2014-10-28 22:02:21 -04:00
parent faf093c474
commit 7e82686818
1 changed files with 17 additions and 9 deletions
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26
SSU.cpp
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@ -227,9 +227,12 @@ namespace transport
m_RelayTag = be32toh (*(uint32_t *)payload);
payload += 4; // relayTag
payload += 4; // signed on time
// decrypt DSA signature
// decrypt signature
size_t signatureLen = m_RemoteIdentity.GetSignatureLen ();
size_t paddingSize = signatureLen & 0x0F; // %16
if (paddingSize > 0) signatureLen += (16 - paddingSize);
m_SessionKeyDecryption.SetIV (((SSUHeader *)buf)->iv);
m_SessionKeyDecryption.Decrypt (payload, 48, payload);
m_SessionKeyDecryption.Decrypt (payload, signatureLen, payload);
// verify
if (!s.Verify (m_RemoteIdentity, payload))
LogPrint (eLogError, "SSU signature verification failed");
@ -249,7 +252,7 @@ namespace transport
payload += identitySize; // identity
payload += 4; // signed-on time
size_t paddingSize = (payload - buf) + m_RemoteIdentity.GetSignatureLen ();
paddingSize >>= 4; // %16
paddingSize &= 0x0F; // %16
if (paddingSize > 0) paddingSize = 16 - paddingSize;
payload += paddingSize;
// TODO: verify signature (need data from session request), payload points to signature
@ -325,7 +328,7 @@ namespace transport
SignedData s; // x,y, remote IP, remote port, our IP, our port, relayTag, signed on time
s.Insert (x, 256); // x
uint8_t buf[368 + 18];
uint8_t buf[384 + 18];
uint8_t * payload = buf + sizeof (SSUHeader);
memcpy (payload, m_DHKeysPair->publicKey, 256);
s.Insert (payload, 256); // y
@ -356,13 +359,18 @@ namespace transport
uint8_t iv[16];
rnd.GenerateBlock (iv, 16); // random iv
// encrypt signature and 8 bytes padding with newly created session key
// encrypt signature and padding with newly created session key
size_t signatureLen = i2p::context.GetIdentity ().GetSignatureLen ();
size_t paddingSize = signatureLen & 0x0F; // %16
if (paddingSize > 0) signatureLen += (16 - paddingSize);
m_SessionKeyEncryption.SetIV (iv);
m_SessionKeyEncryption.Encrypt (payload, 48, payload);
m_SessionKeyEncryption.Encrypt (payload, signatureLen, payload);
payload += signatureLen;
size_t msgLen = payload - buf;
// encrypt message with intro key
FillHeaderAndEncrypt (PAYLOAD_TYPE_SESSION_CREATED, buf, 368, introKey, iv, introKey);
Send (buf, 368);
FillHeaderAndEncrypt (PAYLOAD_TYPE_SESSION_CREATED, buf, msgLen, introKey, iv, introKey);
Send (buf, msgLen);
}
void SSUSession::SendSessionConfirmed (const uint8_t * y, const uint8_t * ourAddress)