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hanshakes hash and finishes message

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pull/163/head
orignal 9 years ago
parent ec50b97aa8
commit 29d118a19a
2 changed files with 56 additions and 20 deletions
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73
Reseed.cpp
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@ -517,7 +517,7 @@ namespace data
0x00, // session id length
0x00, 0x04, // chiper suites length
0x00, 0x00, // NULL_WITH_NULL_NULL
0x00, 0x3D, // RSA_WITH_AES_256_CBC_SHA256
0x00, 0x35, // RSA_WITH_AES_256_CBC_SHA
0x01, // compression methods length
0x00 // no compression
};
@ -533,24 +533,38 @@ namespace data
// client key exchange RSA
// 512 RSA encrypted 48 bytes ( 2 bytes version + 46 random bytes)
};
static uint8_t finished[] =
{
0x16, // handshake
0x03, 0x02, // version (TSL 1.2)
0x00, 0x10, // length of handshake
// handshake
0x14, // handshake type (finished)
0x00, 0x00, 0x0C, // length of handshake payload
// 12 bytes of verified data
};
i2p::util::http::url u(address);
boost::asio::ip::tcp::iostream site;
site.connect(u.host_, "443");
if (site.good ())
{
CryptoPP::SHA256 finishedHash;
// send ClientHello
site.write ((char *)clientHello, sizeof (clientHello));
finishedHash.Update (clientHello, sizeof (clientHello));
// read ServerHello
uint8_t type;
site.read ((char *)&type, 1);
site.read ((char *)&type, 1); finishedHash.Update ((uint8_t *)&type, 1);
uint16_t version;
site.read ((char *)&version, 2);
site.read ((char *)&version, 2); finishedHash.Update ((uint8_t *)&version, 2);
uint16_t length;
site.read ((char *)&length, 2);
site.read ((char *)&length, 2); finishedHash.Update ((uint8_t *)&length, 2);
length = be16toh (length);
char * serverHello = new char[length];
site.read (serverHello, length);
finishedHash.Update ((uint8_t *)serverHello, length);
uint8_t serverRandom[32];
if (serverHello[0] == 0x02) // handshake type server hello
memcpy (serverRandom, serverHello + 6, 32);
@ -558,12 +572,13 @@ namespace data
LogPrint (eLogError, "Unexpected handshake type ", (int)serverHello[0]);
delete[] serverHello;
// read Certificate
site.read ((char *)&type, 1);
site.read ((char *)&version, 2);
site.read ((char *)&length, 2);
site.read ((char *)&type, 1); finishedHash.Update ((uint8_t *)&type, 1);
site.read ((char *)&version, 2); finishedHash.Update ((uint8_t *)&version, 2);
site.read ((char *)&length, 2); finishedHash.Update ((uint8_t *)&length, 2);
length = be16toh (length);
char * certificate = new char[length];
site.read (certificate, length);
finishedHash.Update ((uint8_t *)certificate, length);
CryptoPP::RSA::PublicKey publicKey;
// 0 - handshake type
// 1 - 3 - handshake payload length
@ -585,12 +600,13 @@ namespace data
LogPrint (eLogError, "Unexpected handshake type ", (int)certificate[0]);
delete[] certificate;
// read ServerHelloDone
site.read ((char *)&type, 1);
site.read ((char *)&version, 2);
site.read ((char *)&length, 2);
site.read ((char *)&type, 1); finishedHash.Update ((uint8_t *)&type, 1);
site.read ((char *)&version, 2); finishedHash.Update ((uint8_t *)&version, 2);
site.read ((char *)&length, 2); finishedHash.Update ((uint8_t *)&length, 2);
length = be16toh (length);
char * serverHelloDone = new char[length];
site.read (serverHelloDone, length);
finishedHash.Update ((uint8_t *)serverHelloDone, length);
if (serverHelloDone[0] != 0x0E) // handshake type hello done
LogPrint (eLogError, "Unexpected handshake type ", (int)serverHelloDone[0]);
delete[] serverHelloDone;
@ -606,37 +622,56 @@ namespace data
// send ClientKeyExchange
site.write ((char *)clientKeyExchange, sizeof (clientKeyExchange));
site.write ((char *)encrypted, 512);
finishedHash.Update (clientKeyExchange, sizeof (clientKeyExchange));
finishedHash.Update (encrypted, 512);
uint8_t masterSecret[48], random[64];
memcpy (random, clientHello + 11, 32);
memcpy (random + 32, serverRandom, 32);
PRF (secret, "master secret", random, 48, masterSecret);
// calculate master secret
PRF (secret, "master secret", random, 64, 48, masterSecret);
// send finished
uint8_t finishedHashDigest[32], verifyData[32];
finishedHash.Final (finishedHashDigest);
PRF (masterSecret, "client finished", finishedHashDigest, 32, 12, verifyData);
site.write ((char *)finished, sizeof (finished));
site.write ((char *)finishedHashDigest, 12);
// read finished
site.read ((char *)&type, 1);
site.read ((char *)&version, 2);
site.read ((char *)&length, 2);
length = be16toh (length);
char * finished1 = new char[length];
site.read (finished1, length);
delete[] finished1;
struct
{
uint8_t clientMACKey[32];
uint8_t serverMACKey[32];
uint8_t clientMACKey[20];
uint8_t serverMACKey[20];
uint8_t clientKey[32];
uint8_t serverKey[32];
} keys;
memcpy (random, serverRandom, 32);
memcpy (random + 32, clientHello + 11, 32);
PRF (masterSecret, "key expansion", random, 128, (uint8_t *)&keys);
PRF (masterSecret, "key expansion", random, 64, sizeof (keys), (uint8_t *)&keys);
}
else
LogPrint (eLogError, "Can't connect to ", address);
return "";
}
void Reseeder::PRF (const uint8_t * secret, const char * label, const uint8_t * random, size_t len, uint8_t * buf)
void Reseeder::PRF (const uint8_t * secret, const char * label, const uint8_t * random, size_t randomLen,
size_t len, uint8_t * buf)
{
// secret is assumed 48 bytes
// random is 64 bytes
// output is 48 bytes (buffer size should be 64)
// random is not more than 64 bytes
CryptoPP::HMAC<CryptoPP::SHA256> hmac (secret, 48);
uint8_t seed[96]; size_t seedLen;
seedLen = strlen (label);
memcpy (seed, label, seedLen);
memcpy (seed + seedLen, random, 64);
seedLen += 64;
memcpy (seed + seedLen, random, randomLen);
seedLen += randomLen;
size_t offset = 0;
uint8_t a[128];

3
Reseed.h
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@ -39,7 +39,8 @@ namespace data
bool FindZipDataDescriptor (std::istream& s);
// for HTTPS
void PRF (const uint8_t * secret, const char * label, const uint8_t * random, size_t len, uint8_t * buf);
void PRF (const uint8_t * secret, const char * label, const uint8_t * random, size_t randomLen,
size_t len, uint8_t * buf);
private:

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