The following example code is failing on the DH Agree() function.
I believe the problem is related to how the other's public key is
being loaded by crypto++.
This public key is supposed to have a signed integer. I think there is
a problem by it starting with '00'.
For example, the Prime is also supposed to be a signed negative
integer, but when I check the sign in crypto++ it tells me it is
positive.
Can you please help me to fix this? or to load the public key or prime/
generator correctly?
CODE:
//*****************************************************************
#define CRYPTOPP_DEFAULT_NO_DLL
#include "dh.h"
#include "osrng.h"
USING_NAMESPACE(CryptoPP)
void main(void)
{
AutoSeededRandomPool arng;
RandomNumberGenerator& rng = *dynamic_cast<RandomNumberGenerator
*>(&arng);
// DH public key from other
BYTE OtherPublicKey[] ={0x00, 0xB2, 0xAA, 0x25, 0x04, 0x3E, 0xF2,
0xB4, 0xBC, 0xDD, 0x70, 0xAA, 0xF2, 0x1B, 0x46, 0x4B, 0x36, 0xD1,
0xF0, 0x54, 0x64, 0xCC, 0x52, 0x8C, 0x39, 0x75, 0x69, 0xA4, 0x26,
0xE6, 0xEB, 0x07,
0xA6, 0x23, 0xE5, 0x2A,
0xD5, 0x45, 0xA6, 0xE3, 0x72, 0xE4,
0x7F, 0xDE, 0x6B, 0x8A, 0x78, 0xCC, 0x62, 0x7B, 0xF5, 0x1F, 0x55,
0x59, 0x1F, 0x65, 0xB2, 0x55, 0xBE, 0x1B, 0x30, 0xB4, 0x17, 0x6D,
0x00, 0x0B, 0x27, 0x33,
0xF6, 0x1A, 0xAB, 0x87, 0xA9, 0x5B,
0xF2, 0x8E, 0x73, 0xE2, 0x18, 0xD0, 0x57, 0xD4, 0xFC, 0xE7, 0x07,
0x8A, 0x60, 0x1A, 0x89, 0x21, 0x93, 0x09, 0x6C, 0xEC, 0x14, 0xFD,
0x80, 0x7E, 0x66, 0xD2,
0x0E, 0x99, 0xF5, 0x57, 0xC3, 0x55,
0xC7, 0x2C, 0x05, 0xB1, 0x98, 0xE7, 0x7A, 0x35, 0x72, 0x70, 0x72,
0x91, 0x80, 0x80, 0xAF, 0xFD, 0xAD, 0xB5, 0x56, 0x37, 0x67, 0x2A,
0x1D, 0x8C, 0x9C, 0x81,
0xD6, 0xEC, 0xBC, 0xFB, 0x57, 0x74,
0x5F, 0xE2, 0x64, 0xE3, 0x73, 0x73, 0x31, 0xB5, 0x65, 0x4E, 0x6F,
0xE3, 0xC2, 0x54, 0xC4, 0x07, 0xBA, 0x55, 0xB7, 0x2D, 0xEA, 0xCE,
0x29, 0x3A, 0xF1, 0xCA,
0x28, 0x83, 0x18, 0x6D, 0xAF, 0xF3,
0x16, 0x34, 0x30, 0xEC, 0xD9, 0x88, 0x3B, 0xAF, 0xCD, 0x08, 0x30,
0xB5, 0xF8, 0xB4, 0x7A, 0x0F, 0x74, 0x35, 0x5C, 0x74, 0xA3, 0x46,
0x55};
unsigned long OtherPublicKeyLength = sizeof(OtherPublicKey);
// Domain Parameters: Prime 'p'
Integer iPrime;
BYTE Prime[] = {0x02, 0x81, 0xC0, 0x00, 0xD7, 0xBC, 0xE1, 0xDB, 0x3D,
0x4D, 0x17, 0x74, 0xC1, 0x25, 0xE1, 0x08, 0x59, 0x93, 0x64, 0x17,
0xFC, 0x74, 0xA2, 0xA2, 0xBC, 0x9D, 0x23, 0x24, 0x20, 0x94, 0xD5,
0xB8,
0x04, 0x57, 0x1C, 0xD8, 0xE9, 0x2C,
0x27, 0xD6, 0xA6, 0x4A, 0x9C,
0xD0, 0x72, 0x54, 0x3C, 0x6D, 0x41, 0x1D, 0xFF, 0xD6, 0xAC, 0xBE,
0xE4, 0xFD, 0x61, 0x9D, 0x75, 0xDD, 0xFA, 0xEA, 0x48, 0x1B,
0x23, 0x3C, 0x6C, 0xD7, 0x77, 0xBD,
0x07, 0x92, 0xB2, 0xB7, 0x9C,
0xD2, 0x91, 0x68, 0x58, 0xB3, 0xC6, 0x21, 0xBC, 0x67, 0x0F, 0xF6,
0x23, 0xE0, 0x2F, 0x5C, 0xF1, 0x6F, 0x0C, 0xF2, 0x57, 0x80,
0xEB, 0x50, 0xBE, 0x6B, 0x9F, 0x2A,
0xB8, 0xE4, 0x5E, 0x6D, 0x67,
0xB5, 0x32, 0x50, 0x01, 0x75, 0x8D, 0x3A, 0x97, 0x45, 0x3A, 0xD1,
0x72, 0x10, 0x0A, 0x7B, 0x31, 0xB9, 0xBE, 0x86, 0x5B, 0x5F,
0x6D, 0x0E, 0x28, 0x86, 0x45, 0x87,
0xFB, 0x88, 0x03, 0x3D, 0xDB,
0x01, 0xF2, 0x9A, 0x53, 0x2A, 0xFD, 0x08, 0xD7, 0xA1, 0x2F, 0xA8,
0x4A, 0xA5, 0xB6, 0x80, 0xA7, 0x03, 0x91, 0x73, 0x10, 0xFA,
0xB7, 0xC8, 0x39, 0xEF, 0xA8, 0xD6,
0x9F, 0x92, 0xBA, 0x30, 0x8B,
0x01, 0x63, 0x4E, 0x36, 0x60, 0x0E, 0x45, 0x28, 0x54, 0x1C, 0x43,
0x2B, 0x4C, 0x5D, 0x88, 0x13, 0xB8, 0x79, 0x5F, 0x7F, 0x22,
0xEA, 0x6A, 0x6B, 0x8B};
unsigned long PrimeLength = sizeof(Prime);
std::string sPrime(reinterpret_cast<const char *>(Prime),
PrimeLength);
iPrime.BERDecode(StringStore(sPrime).Ref());
// Domain Parameters: Generator 'g'
Integer iGenerator;
BYTE Generator[] = {0x02, 0x01, 0x02};
unsigned long GeneratorLength = sizeof(Generator);
std::string sGenerator(reinterpret_cast<const char *>(Generator),
GeneratorLength);
iGenerator.BERDecode(StringStore(sGenerator).Ref());
// Initiate DH with the Domain Parameters
DH dh(iPrime, iGenerator);
// Generate my Key Pairs
unsigned long myPrivKeyLength = dh.PrivateKeyLength();
BYTE *myPrivKey = new BYTE[myPrivKeyLength];
unsigned long myPublicKeyLength = dh.PublicKeyLength();
BYTE *myPublicKey = new BYTE[myPublicKeyLength];
dh.GenerateKeyPair(rng, myPrivKey, myPublicKey);
// Generate Shared Secret Key
unsigned int SharedSecretLength = dh.AgreedValueLength();
BYTE *SharedSecret = new BYTE[SharedSecretLength];
//********** THIS IS THE FUNCTION THAT FAILS
*************************
bool Agree = dh.Agree(SharedSecret, myPrivKey, OtherPublicKey, true);
delete myPrivKey;
delete myPublicKey;
delete SharedSecret;
}
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