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#include "commonheaders.h"
// generate KeyA pair and return public key
LPSTR InitKeyA(pUinKey ptr, int features)
{
Sent_NetLog("InitKeyA: %04x", features);
if (!ptr->cntx)
ptr->cntx = cpp_create_context(isProtoSmallPackets(ptr->hContact) ? CPP_MODE_BASE64 : 0);
char *tmp = db_get_sa(ptr->hContact, MODULENAME, "PSK");
if (tmp) {
cpp_init_keyp(ptr->cntx, tmp); // make pre-shared key from password
mir_free(tmp);
}
LPSTR pub_text = cpp_init_keya(ptr->cntx, features); // calculate public and private key & fill KeyA
LPSTR keysig;
if (features & CPP_FEATURES_NEWPG) {
if (features & KEY_B_SIG)
keysig = (LPSTR)SIG_KEYB;
else
keysig = (LPSTR)SIG_KEYA;
}
else if (isProtoSmallPackets(ptr->hContact))
keysig = (LPSTR)SIG_KEY4;
else
keysig = (LPSTR)SIG_KEY3;
int slen = (int)mir_strlen(keysig);
int tlen = (int)mir_strlen(pub_text);
LPSTR keyToSend = (LPSTR)mir_alloc(slen + tlen + 1);
memcpy(keyToSend, keysig, slen);
memcpy(keyToSend + slen, pub_text, tlen + 1);
return keyToSend;
}
// store KeyB into context
int InitKeyB(pUinKey ptr, LPCSTR key)
{
Sent_NetLog("InitKeyB: %s", key);
if (!ptr->cntx)
ptr->cntx = cpp_create_context(isProtoSmallPackets(ptr->hContact) ? CPP_MODE_BASE64 : 0);
if (!cpp_keyp(ptr->cntx)) {
char *tmp = db_get_sa(ptr->hContact, MODULENAME, "PSK");
if (tmp) {
cpp_init_keyp(ptr->cntx, tmp); // make pre-shared key from password
mir_free(tmp);
}
}
cpp_init_keyb(ptr->cntx, key);
ptr->features = cpp_get_features(ptr->cntx);
return cpp_get_error(ptr->cntx);
}
// store KeyX into context
void InitKeyX(pUinKey ptr, uint8_t *key)
{
if (!ptr->cntx)
ptr->cntx = cpp_create_context(isProtoSmallPackets(ptr->hContact) ? CPP_MODE_BASE64 : 0);
cpp_set_keyx(ptr->cntx, key);
}
// calculate secret key
BOOL CalculateKeyX(pUinKey ptr, MCONTACT hContact)
{
int agr = cpp_calc_keyx(ptr->cntx);
if (agr) {
// do this only if key exchanged is ok
// we use a 192bit key
int keysize = cpp_size_keyx();
uint8_t *buffer = (uint8_t*)alloca(keysize); // buffer for hash
// store key
cpp_get_keyx(ptr->cntx, buffer);
// store key in database
db_set_blob(hContact, MODULENAME, "offlineKey", buffer, keysize);
// store timeout of key in database (2 days)
g_plugin.setDword(hContact, "offlineKeyTimeout", gettime() + (60 * 60 * 24 * g_plugin.getWord("okt", 2)));
// key exchange is finished
showPopupEC(ptr->hContact);
}
else // agree value problem
showPopup(LPGEN("Key exchange failed..."), hContact, g_hPOP[POP_PU_DIS], 0);
return agr != 0;
}
// encrypt message
LPSTR encrypt(pUinKey ptr, LPCSTR szEncMsg)
{
LPSTR szSig = (LPSTR)(ptr->offlineKey ? SIG_ENOF : SIG_ENON);
int slen = (int)mir_strlen(szSig);
int clen = (int)mir_strlen(szEncMsg);
LPSTR szMsg = (LPSTR)mir_alloc(clen + slen + 1);
memcpy(szMsg, szSig, slen);
memcpy(szMsg + slen, szEncMsg, clen + 1);
return szMsg;
}
// encode message
LPSTR encodeMsg(pUinKey ptr, LPARAM lParam)
{
CCSDATA *pccsd = (CCSDATA *)lParam;
return encrypt(ptr, cpp_encodeU(ptr->cntx, (LPSTR)pccsd->lParam));
}
// decode message
LPSTR decodeMsg(pUinKey ptr, LPARAM lParam, LPSTR szEncMsg)
{
CCSDATA *pccsd = (CCSDATA *)lParam;
auto *dbei = (DB::EventInfo *)pccsd->lParam;
LPSTR szNewMsg = nullptr;
LPSTR szOldMsg = cpp_decodeU(ptr->cntx, szEncMsg);
if (szOldMsg == nullptr) {
ptr->decoded = false;
switch (cpp_get_error(ptr->cntx)) {
case CPP_ERROR_BAD_LEN:
szNewMsg = mir_strdup(Translate("SecureIM: Error while decrypting the message, bad message length."));
break;
case CPP_ERROR_BAD_CRC:
szNewMsg = mir_strdup(Translate("SecureIM: Error while decrypting the message, bad message CRC."));
break;
default:
ptr->decoded = true;
szNewMsg = mir_strdup(Translate("SecureIM: Error while decrypting the message."));
break;
}
}
else {
ptr->decoded = true;
int olen = (int)mir_strlen(szOldMsg) + 1;
szNewMsg = (LPSTR)mir_alloc(olen);
memcpy(szNewMsg, szOldMsg, olen);
}
dbei->pBlob = szNewMsg;
return szNewMsg;
}
BOOL LoadKeyPGP(pUinKey ptr)
{
int mode = db_get_b(ptr->hContact, MODULENAME, "pgp_mode", 255);
if (mode == 0) {
DBVARIANT dbv;
if(!db_get(ptr->hContact, MODULENAME, "pgp", &dbv)) {
BOOL r = (dbv.type == DBVT_BLOB);
if (r)
pgp_set_keyid(ptr->cntx, (PVOID)dbv.pbVal);
db_free(&dbv);
return r;
}
}
else if (mode == 1) {
LPSTR key = db_get_sa(ptr->hContact, MODULENAME, "pgp");
if (key) {
pgp_set_key(ptr->cntx, key);
mir_free(key);
return 1;
}
}
return 0;
}
BOOL LoadKeyGPG(pUinKey ptr)
{
LPSTR key = db_get_sa(ptr->hContact, MODULENAME, "gpg");
if (key) {
gpg_set_keyid(ptr->cntx, key);
mir_free(key);
return 2;
}
return 0;
}
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