//---------------------------------------------------------------------
bool PeerContactProfile::setPrivateProfile(ElementPtr newProfileElement)
{
AutoRecursiveLock lock(mLock);
if (!mDocument) return false;
PeerFilesPtr outer;
IPeerFilePrivatePtr privatePeer;
if (!isExternal()) {
outer = mPeerFiles.lock();
if (!outer) return false;
privatePeer = outer->getPrivate();
if (!privatePeer) return false;
}
try {
ElementPtr contactProfileElement = getContactProfileElement();
if (!contactProfileElement) return false;
ElementPtr privateElement = contactProfileElement->findFirstChildElementChecked("private");
ElementPtr encryptedProfileElement = privateElement->findFirstChildElement("encryptedProfile");
ElementPtr saltElement = privateElement->findFirstChildElementChecked("salt");
String saltAsBase64 = saltElement->getText(true);
if (!newProfileElement) {
// erasing the profile element to clean
newProfileElement = Element::create();
newProfileElement->setValue("profile");
}
DocumentPtr tempDoc = Document::create();
tempDoc->adoptAsLastChild(newProfileElement->clone());
// write out the new value
boost::shared_array<char> output = tempDoc->write();
// encrypt it
String encryptedProfileAsBase64 = encryptToBase64(
"profile",
mContactProfileSecret.c_str(),
saltAsBase64,
(const BYTE *)(output.get()),
strlen(output.get())
);
ElementPtr tempNewEncryptedProfileElement = Element::create();
tempNewEncryptedProfileElement->setValue("encryptedProfile");
TextPtr encryptedProfileText = Text::create();
encryptedProfileText->setValue(encryptedProfileAsBase64);
tempNewEncryptedProfileElement->adoptAsLastChild(encryptedProfileText);
if (encryptedProfileElement) {
encryptedProfileElement->adoptAsNextSibling(tempNewEncryptedProfileElement);
encryptedProfileElement->orphan();
} else {
privateElement->adoptAsLastChild(tempNewEncryptedProfileElement);
}
// upgrade the document version number
UINT version = getVersionNumber();
++version;
contactProfileElement->setAttribute("version", Stringize<UINT>(version).string());
if (!isExternal()) {
// now this this must be signed
privatePeer->signElement(contactProfileElement);
}
} catch (zsLib::XML::Exceptions::CheckFailed &) {
return false;
}
return true;
}
//---------------------------------------------------------------------
PeerContactProfilePtr PeerContactProfile::createExternalFromPrivateProfile(ElementPtr privateProfileElement)
{
if (!privateProfileElement) return PeerContactProfilePtr();
privateProfileElement = (privateProfileElement->clone())->toElementChecked();
static const char *contactProfileSkeleton =
"<contactProfile version=\"0\">\n"
" <private>\n"
" <salt />\n"
" <proof cipher=\"sha256/aes256\" />\n"
" <encryptedProfile cipher=\"sha256/aes256\" />\n"
" <contactProfileSecret cipher=\"sha256/aes256\" />\n"
" </private>\n"
"</contactProfile>";
DocumentPtr contactProfileDoc = Document::create();
contactProfileDoc->parse(contactProfileSkeleton);
String contactID = services::IHelper::randomString(32);
String contactProfileSecret = services::IHelper::randomString(32);
// generate external profile
{
std::string contactSalt;
// generate salt
{
AutoSeededRandomPool rng;
SecureByteBlock contactSaltRaw(32);
rng.GenerateBlock(contactSaltRaw, contactSaltRaw.size());
contactSalt = convertToBase64(contactSaltRaw, contactSaltRaw.size());
}
ElementPtr contactProfileElement = contactProfileDoc->getFirstChildElementChecked();
contactProfileElement->setAttribute("id", contactID);
ElementPtr privateElement = contactProfileElement->getFirstChildElementChecked();
ElementPtr saltElement = privateElement->getFirstChildElementChecked();
TextPtr saltText = Text::create();
saltText->setValue(contactSalt);
saltElement->adoptAsLastChild(saltText);
SecureByteBlock contactProofHash(32);
SHA256 contactProof;
contactProof.Update((const BYTE *)"proof:", strlen("proof:"));
contactProof.Update((const BYTE *)contactProfileSecret.c_str(), contactProfileSecret.size());
contactProof.Final(contactProofHash);
String contactProofInBase64 = convertToBase64(contactProofHash, contactProofHash.size());
ElementPtr proofElement = saltElement->getNextSiblingElementChecked();
TextPtr proofText = Text::create();
proofText->setValue(contactProofInBase64);
proofElement->adoptAsLastChild(proofText);
DocumentPtr privateProfileDocument = Document::create();
privateProfileDocument->adoptAsLastChild(privateProfileElement);
ULONG length = 0;
boost::shared_array<char> output;
output = privateProfileDocument->write(&length);
ElementPtr encryptedProfileElement = proofElement->getNextSiblingElementChecked();
String encryptedProfileString = encryptToBase64("profile", contactProfileSecret, contactSalt, (const BYTE *)(output.get()), length);
TextPtr encryptProfileText = Text::create();
encryptProfileText->setValue(encryptedProfileString);
encryptedProfileElement->adoptAsLastChild(encryptProfileText);
ElementPtr contactProfileSecretElement = encryptedProfileElement->getNextSiblingElementChecked();
TextPtr contactProfileSecretText = Text::create();
contactProfileSecretText->setValue(contactProfileSecret);
contactProfileSecretElement->adoptAsLastChild(contactProfileSecretText);
}
PeerContactProfilePtr pThis(new PeerContactProfile);
pThis->mThisWeak = pThis;
pThis->mDocument = contactProfileDoc;
pThis->mContactProfileSecret = contactProfileSecret;
return pThis;
}