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HMAC fixed to start with the correct key now

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This commit is contained in:
Simon Rozman 2016-08-10 11:18:20 +02:00
parent e92f47677d
commit fb0fa0de31
2 changed files with 24 additions and 15 deletions
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33
lib/TLS/include/Method.h
View File

@ -565,27 +565,36 @@ namespace eap
_In_ size_t size);
///
/// HMAC symmetric key generation
/// Creates HMAC key
///
/// \param[in] alg Hashing algorithm to use (CALG_MD5 or CALG_SHA1)
/// \param[in] secret Hashing secret key
/// \param[in] secret Hashing secret
/// \param[in] size_secret \p secret size
///
/// \returns Key
///
inline HCRYPTKEY derive_hmac_key(
_In_ ALG_ID alg,
inline HCRYPTKEY create_hmac_key(
_In_bytecount_(size_secret) const void *secret,
_In_ size_t size_secret)
{
winstd::crypt_hash hash;
if (!hash.create(m_cp, alg, 0, 0))
throw winstd::win_runtime_error(__FUNCTION__ " Error creating key hash.");
if (!CryptHashData(hash, (const BYTE*)secret, (DWORD)size_secret, 0))
throw winstd::win_runtime_error(__FUNCTION__ " Error hashing secret.");
// Prepare exported key BLOB.
static const PUBLICKEYSTRUC s_key_data_struct = {
PLAINTEXTKEYBLOB,
CUR_BLOB_VERSION,
0,
CALG_RC4,
};
std::vector<unsigned char> key_blob;
key_blob.reserve(sizeof(PUBLICKEYSTRUC) + sizeof(DWORD) + size_secret);
key_blob.assign((const unsigned char*)&s_key_data_struct, (const unsigned char*)(&s_key_data_struct + 1));
assert(size_secret <= 0xffffffff);
DWORD _size_secret = (DWORD)size_secret;
key_blob.insert(key_blob.end(), (const unsigned char*)&_size_secret, (const unsigned char*)(&_size_secret + 1));
key_blob.insert(key_blob.end(), (const unsigned char*)secret, (const unsigned char*)secret + _size_secret);
// Import the key.
winstd::crypt_key key;
if (!key.derive(m_cp, CALG_RC4, hash, 0))
throw winstd::win_runtime_error(__FUNCTION__ " Error deriving key.");
if (!key.import(m_cp, key_blob.data(), (DWORD)key_blob.size(), NULL, 0))
throw winstd::win_runtime_error(__FUNCTION__ " Error importing key.");
return key.detach();
}

6
lib/TLS/src/Method.cpp
View File

@ -809,7 +809,7 @@ void eap::method_tls::derive_keys()
vector<unsigned char> key;
key.assign((const unsigned char*)&s_key_struct, (const unsigned char*)(&s_key_struct + 1));
key.insert(key.end(), data, data + 20);
if (!m_key_hmac.import(m_cp, key.data(), key.size(), NULL, 0))
if (!m_key_hmac.import(m_cp, key.data(), (DWORD)key.size(), NULL, 0))
throw win_runtime_error(__FUNCTION__ " Error importing client_write_MAC_secret key.");
@ -1187,8 +1187,8 @@ vector<unsigned char> eap::method_tls::p_hash(
_In_ size_t size_seed,
_In_ size_t size)
{
// HMAC symmetric key generation.
crypt_key key_hmac(derive_hmac_key(alg, secret, size_secret));
// HMAC symmetric key creation.
crypt_key key_hmac(create_hmac_key(secret, size_secret));
vector<unsigned char> block;
const HMAC_INFO hmac_info = { alg };