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fixed bug in shared secret generation

This commit is contained in:
unsh 2007-07-06 09:38:38 +00:00
parent 1e8b11adb3
commit 927985b38a
1 changed files with 12 additions and 3 deletions
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15
src/pe_crypto.cpp
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@ -50,6 +50,7 @@ namespace libtorrent {
m_DH->p = BN_bin2bn (m_dh_prime, sizeof(m_dh_prime), NULL);
m_DH->g = BN_bin2bn (m_dh_generator, sizeof(m_dh_generator), NULL);
m_DH->length = 160l;
assert (sizeof(m_dh_prime) == DH_size(m_DH));
@ -81,7 +82,7 @@ namespace libtorrent {
DH_free (m_DH);
}
char const* DH_key_exchange::get_local_key () const
char const* DH_key_exchange::get_local_key () const
{
return m_dh_local_key;
}
@ -92,9 +93,17 @@ namespace libtorrent {
{
assert (remote_pubkey);
BIGNUM* bn_remote_pubkey = BN_bin2bn ((unsigned char*)remote_pubkey, 96, NULL);
char dh_secret[96];
int ret =
DH_compute_key ( (unsigned char*)m_dh_secret, bn_remote_pubkey, m_DH); // TODO Check for errors
int secret_size = DH_compute_key ( (unsigned char*)dh_secret,
bn_remote_pubkey, m_DH); // TODO Check for errors
if (secret_size != 96)
{
assert(secret_size < 96 && secret_size > 0);
std::fill(m_dh_secret, m_dh_secret + 96 - secret_size, 0);
}
std::copy(dh_secret, dh_secret + secret_size, m_dh_secret + 96 - secret_size);
BN_free (bn_remote_pubkey);
}