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Allow one or two '=' at the end of base64.

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This commit is contained in:
John Preston 2019-07-09 14:07:43 +02:00
parent 8135f4b427
commit 0805c09446
1 changed files with 33 additions and 8 deletions
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41
Telegram/SourceFiles/core/utils.cpp
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@ -86,19 +86,22 @@ void _initMsgIdConstants() {
}
[[nodiscard]] bool IsHexMtprotoPassword(const QString &password) {
const auto size = password.size();
if (size < 32 || size % 2 == 1) {
return false;
}
const auto bad = [](QChar ch) {
const auto code = ch.unicode();
return (code < 'a' || code > 'f')
&& (code < 'A' || code > 'F')
&& (code < '0' || code > '9');
};
return (password.size() % 2 == 0)
&& (std::find_if(password.begin(), password.end(), bad)
== password.end());
const auto i = std::find_if(password.begin(), password.end(), bad);
return (i == password.end());
}
[[nodiscard]] ProxyData::Status HexMtprotoPasswordStatus(
const QString &password) {
const QString &password) {
const auto size = password.size() / 2;
const auto valid = (size == 16)
|| (size == 17 && (password[0] == 'd') && (password[1] == 'd'))
@ -139,7 +142,28 @@ void _initMsgIdConstants() {
return result;
}
[[nodiscard]] QStringRef Base64UrlInner(const QString &password) {
Expects(password.size() > 2);
// Skip one or two '=' at the end of the string.
return password.midRef(0, [&] {
auto result = password.size();
for (auto i = 0; i != 2; ++i) {
const auto prev = result - 1;
if (password[prev] != '=') {
break;
}
result = prev;
}
return result;
}());
}
[[nodiscard]] bool IsBase64UrlMtprotoPassword(const QString &password) {
const auto size = password.size();
if (size < 22 || size % 4 == 1) {
return false;
}
const auto bad = [](QChar ch) {
const auto code = ch.unicode();
return (code < 'a' || code > 'z')
@ -148,14 +172,15 @@ void _initMsgIdConstants() {
&& (code != '_')
&& (code != '-');
};
return (password.size() % 4 != 1)
&& (std::find_if(password.begin(), password.end(), bad)
== password.end());
const auto inner = Base64UrlInner(password);
const auto i = std::find_if(inner.begin(), inner.end(), bad);
return (i == inner.end());
}
[[nodiscard]] ProxyData::Status Base64UrlMtprotoPasswordStatus(
const QString &password) {
const auto size = (password.size() * 3) / 4;
const auto inner = Base64UrlInner(password);
const auto size = (inner.size() * 3) / 4;
const auto valid = (size == 16)
|| (size == 17
&& (password[0] == '3')