Hi there.
I'm having some "problems" for quite some time now with Crypto++.
There are two issues i want to raise:
1.I encrypt with AES a plain text , i dump the ciphertext in a file and then
i try to read the file intro a string.
I used to read the file like that:
//this would give me the correct file size
long fileLength = FileMessageSize(finName);
ifstream ifs(finName.c_str(),ios_base::binary);
ifs.read(buf,fileLength);
ifs.close();
The problem is that because the file contains weird characters after the
encryption , it actually reads until it finds end of file (or 00 i think -
in hex) (->i debuged my program and seen it stops when encountering 00)
Behaves the same if using fread().
Thus i changed to C style reading which works fine:
unsigned i = 0;
while(!feof(f))
{
fscanf(f, "%c", &str[i]);
i++;
}
(Said all the above for others that might encounter the same problem and as
a preamble for the next part)
2.I wanted to hex encode the text after i encrypted it so i could keep it in
a "nicer" format.
So i encrypt the plain text , and then i encode with this:
string HexEncode(string in)
{
string result;
StringSource(in.c_str(), true, new HexEncoder(new StringSink(result)));
return result;
}
The problem is that the encrypted text has 17000 bytes (a test string i'm
using), but the encoding of the encrypted string has only 200 , something
like that . And my guess is that HexEncoder(new StringSink(result)) works
with buffering functions and it behaves similar to what I described at point
1, only that here it probably finds '\0' when reading those weird characters
and he thinks the string terminates there and stops.
I just wanted to point out these issues , maybe you'll find them important
(the second one) - if not , at least people that encounter the same problem
will know why it happens.
Cheers
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