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Fix GetField for stray CR or LF 

The test vector rsa_pkcs1_1_5.txt is the torture test. We calculated an incorrect index when a line continuation was part of a comment
pull/186/merge
Jeffrey Walton 2017-05-12 14:25:25 -04:00
parent 3f9667f3cd
commit 973de7712a
No known key found for this signature in database
GPG Key ID: B36AB348921B1838
1 changed files with 46 additions and 14 deletions
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60
datatest.cpp
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@ -656,6 +656,10 @@ void TestKeyDerivationFunction(TestData &v)
SignalTestFailure();
}
// GetField parses the name/value pairs. The tricky part is the insertion operator
// because Unix&Linux uses LF, OS X uses CR, and Windows uses CRLF. If this function
// is modified, then run 'cryptest.exe tv rsa_pkcs1_1_5' as a test. Its the parser
// file from hell. If it can be parsed without error, then things are likely OK.
bool GetField(std::istream &is, std::string &name, std::string &value)
{
// ***** Name *****
@ -685,31 +689,59 @@ bool GetField(std::istream &is, std::string &name, std::string &value)
while (continueLine && std::getline(is, line))
{
// Early out for immediately continuing a line
if (!line.empty() && line[0] == '\\') { continue; }
// Unix and Linux may have a stray \r because of Windows
if (!line.empty() && (line[line.size() - 1] == '\r' || line[line.size() - 1] == '\n')) {
line.erase(line.size()-1);
}
// Leading, trailing and temp position. The leading iterator moves right, and trailing
// iterator moves left. The sub-string in the middle is the value for the name. The
// value can be an empty string. One Plaintext is often empty for algorithm testing.
continueLine = false;
if (!line.empty())
{
// Early out for immediate line continuation
if (line[0] == '\\') {
continueLine = true;
continue;
}
// Check end of line. It must be last character
if (line[line.size() - 1] == '\\') {
continueLine = true;
}
}
// Leading, trailing and temp position. The leading position moves right, and
// trailing position moves left. The sub-string in the middle is the value for
// the name. We leave one space when line continuation is in effect, (and if
// present). The value can be an empty string. One Plaintext value is often
// empty for algorithm testing.
std::string::size_type l, t, p;
const std::string whitespace = " \r\n\t\v\f";
l = line.find_first_not_of(whitespace);
if (l == std::string::npos) { break; }
t = line.find_last_not_of(whitespace);
continueLine = false;
if (t != std::string::npos && line[t] == '\\') {
continueLine = true;
t = line.find_last_not_of(whitespace, t-1);
}
if (l == std::string::npos) { l = 0; }
t = line.find_last_not_of(whitespace+"\\");
if (l == std::string::npos) { t = line.size(); }
// Chop comment. Perform after setting continueLine
p = line.find('#', l);
if (p < t) {
t = p;
t = line.find_last_not_of(whitespace, t-1);
if (t) t--;
}
// Leave one whitespace if line continuation is in effect
if (continueLine)
{
if (l > 0 && ::isspace(line[l - 1]))
{
l--;
}
else if (t < line.size()-1 && ::isspace(line[t + 1]))
{
t++;
}
}
CRYPTOPP_ASSERT(t >= l);
value += line.substr(l, t - l + 1);
}