Thank you for your answers.
@ Ludwig Seiz
This was my first test, to change the private and public key's ...
But it dosn't work !
The program end's with an 'Debug Error !' --> 'Abnormal Program Termination'
at the point
RSAEncryptString("privkey.txt", "Testseed", plain.data());
Is there a trick, to change the key's ????
I hope you can help me, to find a solution for encrypt with the private and
decrypt with the public key.
This would be the best solution for me .....
Thank you, for your help !!
best regards,
Torsten
Here is my Testprogram :
// mytest.cpp
//
#include "stdafx.h"
#include "cryptlib.h"
#include "randpool.h"
#include "sha.h"
#include "rsa.h"
#include "hex.h"
#include "files.h"
#include "elgamal.h"
#include "pubkey.h"
#include "validate.h"
#include "randpool.h"
#include "pkcspad.h"
#include "oaep.h"
#include "integer.h"
#include "asn.h"
using namespace std;
using namespace CryptoPP;
RandomPool & GlobalRNG()
{
static RandomPool randomPool;
return randomPool;
}
void GenerateRSAKey(unsigned int keyLength, const char *privFilename, const
char *pubFilename, const char *seed)
{
RandomPool randPool;
randPool.Put((byte *)seed, strlen(seed));
RSAES_OAEP_SHA_Decryptor priv(randPool, keyLength);
HexEncoder privFile(new FileSink(privFilename));
priv.DEREncode(privFile);
privFile.MessageEnd();
RSAES_OAEP_SHA_Encryptor pub(priv);
HexEncoder pubFile(new FileSink(pubFilename));
pub.DEREncode(pubFile);
pubFile.MessageEnd();
}
string RSAEncryptString(const char *pubFilename, const char *seed, const
char *message)
{
FileSource pubFile(pubFilename, true, new HexDecoder);
RSAES_OAEP_SHA_Encryptor pub(pubFile);
RandomPool randPool;
randPool.Put((byte *)seed, strlen(seed));
string result;
StringSource(message, true, new PK_EncryptorFilter(randPool, pub, new
HexEncoder(new StringSink(result))));
return result;
}
string RSADecryptString(const char *privFilename, const char *ciphertext)
{
FileSource privFile(privFilename, true, new HexDecoder);
RSAES_OAEP_SHA_Decryptor priv(privFile);
string result;
StringSource(ciphertext, true, new HexDecoder(new
PK_DecryptorFilter(GlobalRNG(), priv, new StringSink(result))));
return result;
}
int main(int argc, char* argv[])
{
string plain = "This is the text to encrypted";
string strenc;
string strdec;
GenerateRSAKey( 1024, "privkey.txt", "pubkey.txt", "Testseed");
printf("Plain : %s\n\n", plain.data());
strenc = RSAEncryptString("privkey.txt", "Testseed", plain.data());
printf("Encrypted : %s\n\n", strenc.data());
strdec = RSADecryptString("pubkey.txt", strenc.data());
printf("Decrypted : %s\n\n", strdec.data());
return 0;
}
