Hi friends!
I'm using Visual C++ 2008 and "CryptoPP 5.5.2" version!
I've built the code below successfully:
#include "stdafx.h"
#include "rsa.h"
#include "osrng.h" // PRNG
#include "hex.h" // Hex Encoder/Decoder
#include "files.h" // File Source and Sink
int main(int argc, char* argv[])
{
try
{
CryptoPP::AutoSeededRandomPool rng;
std::string message = "Yoda said, Do or Do Not. There is not
try.";
// Input: Private Key
std::string PrivateKeyFile = "key.pv";
// Output: Signed Message M
std::string SignedFile = "message.sig";
CryptoPP::FileSource privFile( PrivateKeyFile.c_str(), true,
new
CryptoPP::HexDecoder);
CryptoPP::RSASSA_PKCS1v15_SHA_Signer priv(privFile);
// Sign Away...
CryptoPP::StringSource( message, true,
new CryptoPP::SignerFilter( rng, priv,
new CryptoPP::HexEncoder(
new CryptoPP::FileSink( SignedFile.c_str() )
) // HexEncoder
) // SignerFilter
); // StringSource
} // try
catch( CryptoPP::Exception& e ) {
std::cerr << "Error: " << e.what() << std::endl;
}
catch (...) {
std::cerr << "Unknown Error" << std::endl;
}
return 0;
}
Then I decided to remove scope sections("CryptoPP::" and "std::") form
code, such below:
#include "stdafx.h"
#include "rsa.h"
#include "osrng.h" // PRNG
#include "hex.h" // Hex Encoder/Decoder
#include "files.h" // File Source and Sink
int main()
{
try
{
AutoSeededRandomPool rng;
string message = "Yoda said, Do or Do Not. There is not try.";
// Input: Private Key
string PrivateKeyFile = "key.pv";
// Output: Signed Message M
string SignedFile = "message.sig";
FileSource privFile( PrivateKeyFile.c_str(), true, new
HexDecoder);
RSASSA_PKCS1v15_SHA_Signer priv(privFile);
// Sign Away...
StringSource( message, true,
new SignerFilter( rng, priv,
new HexEncoder(
new FileSink( SignedFile.c_str() )
) // HexEncoder
) // SignerFilter
); // StringSource
} // try
catch( Exception& e ) {
cerr << "Error: " << e.what() << endl;
}
catch (...) {
cerr << "Unknown Error" << endl;
}
return 0;
}
And then got 35 errors as following:
------ Build started: Project: RSASign, Configuration: Debug Win32
------
Compiling...
RSASign.cpp
d:\rsasign.cpp(12) : error C2065: 'AutoSeededRandomPool' : undeclared
identifier
d:\rsasign.cpp(12) : error C2146: syntax error : missing ';' before
identifier 'rng'
d:\rsasign.cpp(12) : error C2065: 'rng' : undeclared identifier
d:\rsasign.cpp(13) : error C2065: 'string' : undeclared identifier
d:\rsasign.cpp(13) : error C2146: syntax error : missing ';' before
identifier 'message'
d:\rsasign.cpp(13) : error C2065: 'message' : undeclared identifier
d:\rsasign.cpp(16) : error C2065: 'string' : undeclared identifier
d:\rsasign.cpp(16) : error C2146: syntax error : missing ';'
before
identifier'PrivateKeyFile'
d:\rsasign.cpp(16) : error C2065: 'PrivateKeyFile' : undeclared
identifier
d:\rsasign.cpp(19) : error C2065: 'string' : undeclared identifier
d:\rsasign.cpp(19) : error C2146: syntax error : missing ';' before
identifier 'SignedFile'
d:\rsasign.cpp(19) : error C2065: 'SignedFile' : undeclared identifier
d:\rsasign.cpp(21) : error C2065: 'FileSource' : undeclared identifier
d:\rsasign.cpp(21) : error C2146: syntax error : missing ';' before
identifier 'privFile'
d:\rsasign.cpp(21) : error C2065: 'PrivateKeyFile' : undeclared
identifier
d:\rsasign.cpp(21) : error C2228: left of '.c_str' must have class/
struct/union
type is ''unknown-type''
d:\rsasign.cpp(21) : error C2061: syntax error : identifier
'HexDecoder'
d:\rsasign.cpp(21) : error C3861: 'privFile': identifier not found
d:\rsasign.cpp(22) : error C2065: 'RSASSA_PKCS1v15_SHA_Signer' :
undeclared identifier
d:\rsasign.cpp(22) : error C2146: syntax error : missing ';' before
identifier 'priv'
d:\rsasign.cpp(22) : error C2065: 'privFile' : undeclared identifier
d:\rsasign.cpp(22) : error C3861: 'priv': identifier not found
d:\rsasign.cpp(25) : error C2065: 'message' : undeclared identifier
d:\rsasign.cpp(26) : error C2061: syntax error : identifier
'SignerFilter'
d:\rsasign.cpp(26) : error C2065: 'priv' : undeclared identifier
d:\rsasign.cpp(27) : error C2061: syntax error : identifier
'HexEncoder'
d:\rsasign.cpp(35) : error C2061: syntax error : identifier
'Exception'
d:\rsasign.cpp(35) : error C2310: catch handlers must specify one type
d:\rsasign.cpp(36) : error C2065: 'cerr' : undeclared identifier
d:\rsasign.cpp(36) : error C2065: 'e' : undeclared identifier
d:\rsasign.cpp(36) : error C2228: left of '.what' must have class/
struct/union
type is ''unknown-type''
d:\rsasign.cpp(36) : error C2065: 'endl' : undeclared identifier
d:\rsasign.cpp(25) : error C3861: 'StringSource': identifier not found
d:\rsasign.cpp(40) : error C2065: 'cerr' : undeclared identifier
d:\rsasign.cpp(40) : error C2065: 'endl' : undeclared identifier
RSASign - 35 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped
==========
Now my question is that why sould the codes using "CryptoPP"
library,have this scopes in
themselves certainly?
Though we use necessary "Header Files" and have added this library to
Visual studio
environment,why should we maintain these scopes("CryptoPP::" and
"std::") in the codes
again?
Why is this work necessary?
Thank you!
Gary
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