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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)strlen(keysig);
int tlen = (int)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,BYTE *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();
PBYTE buffer = (PBYTE) 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)
db_set_dw(hContact, MODULENAME, "offlineKeyTimeout", gettime()+(60*60*24*db_get_w(0,MODULENAME,"okt",2)));
// key exchange is finished
showPopupEC(ptr->hContact);
}
else {
// agree value problem
showPopup(sim002,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)strlen(szSig);
int clen = (int)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;
LPSTR szNewMsg = NULL;
LPSTR szOldMsg = (LPSTR) pccsd->lParam;
if (pccsd->wParam & PREF_UTF )
szNewMsg = encrypt(ptr,cpp_encodeU(ptr->cntx,szOldMsg));
else if (pccsd->wParam & PREF_UNICODE )
szNewMsg = encrypt(ptr,cpp_encodeW(ptr->cntx,(LPWSTR)(szOldMsg+strlen(szOldMsg)+1)));
else
szNewMsg = encrypt(ptr,cpp_encodeA(ptr->cntx,szOldMsg));
pccsd->wParam &= ~PREF_UNICODE;
return szNewMsg;
}
// decode message
LPSTR decodeMsg(pUinKey ptr, LPARAM lParam, LPSTR szEncMsg)
{
CCSDATA *pccsd = (CCSDATA *)lParam;
PROTORECVEVENT *ppre = (PROTORECVEVENT *)pccsd->lParam;
LPSTR szNewMsg = NULL;
LPSTR szOldMsg = (ppre->flags&PREF_UTF)?cpp_decodeU(ptr->cntx,szEncMsg):cpp_decode(ptr->cntx,szEncMsg);
if (szOldMsg == NULL) {
ptr->decoded = false;
switch(cpp_get_error(ptr->cntx)) {
case CPP_ERROR_BAD_LEN:
szNewMsg = mir_strdup(Translate(sim102));
break;
case CPP_ERROR_BAD_CRC:
szNewMsg = mir_strdup(Translate(sim103));
break;
default:
ptr->decoded=true;
szNewMsg = mir_strdup(Translate(sim101));
break;
}
ppre->flags &= ~(PREF_UNICODE|PREF_UTF);
pccsd->wParam &= ~(PREF_UNICODE|PREF_UTF);
}
else {
ptr->decoded=true;
if (ppre->flags & PREF_UTF) { // ¥á«¨ ¯à®â®ª®« ¯®¤¤¥à¦¨¢ ¥â utf8 - ⮣¤ ®â¯à ¢«ï¥¬ ¢ utf8
int olen = (int)strlen(szOldMsg)+1;
szNewMsg = (LPSTR) mir_alloc(olen);
memcpy(szNewMsg,szOldMsg,olen);
}
else {
int olen = ((int)strlen(szOldMsg)+1)*(sizeof(WCHAR)+1);
szNewMsg = (LPSTR) mir_alloc(olen);
memcpy(szNewMsg,szOldMsg,olen);
ppre->flags |= PREF_UNICODE;
pccsd->wParam |= PREF_UNICODE;
}
}
ppre->szMessage = szNewMsg;
return szNewMsg;
}
BOOL LoadKeyPGP(pUinKey ptr)
{
int mode = db_get_b(ptr->hContact,MODULENAME,"pgp_mode",255);
if (mode == 0) {
DBVARIANT dbv;
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;
}
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;
}
// EOF
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