// Input: MyPrivKey = Your private key
// HisPubKey = Someones public key
// Output: MyPrivKey has been destroyed for security reasons
// HisPubKey = the secret key
int DH1080_comp(char *MyPrivKey, char *HisPubKey)
{
//int i=0;
int iRet;
unsigned char SHA256digest[35], base64_tmp[160];
mpz_t b_myPrivkey, b_HisPubkey, b_theKey;
size_t len;
// Verify base64 strings
if((strspn(MyPrivKey, B64ABC) != strlen(MyPrivKey)) || (strspn(HisPubKey, B64ABC) != strlen(HisPubKey)))
{
memset(MyPrivKey, 0x20, strlen(MyPrivKey));
memset(HisPubKey, 0x20, strlen(HisPubKey));
return 0;
}
mpz_init(b_HisPubkey);
mpz_init(b_theKey);
len=b64toh(HisPubKey, (char *)base64_tmp);
mpz_import(b_HisPubkey, len, 1, 1, 0, 0, base64_tmp);
if(DH_verifyPubKey(b_HisPubkey))
{
mpz_init(b_myPrivkey);
len=b64toh(MyPrivKey, (char *)base64_tmp);
mpz_import(b_myPrivkey, len, 1, 1, 0, 0, base64_tmp);
memset(MyPrivKey, 0x20, strlen(MyPrivKey));
mpz_powm(b_theKey, b_HisPubkey, b_myPrivkey, b_prime1080);
mpz_clear(b_myPrivkey);
mpz_export(base64_tmp, &len, 1, 1, 0, 0, b_theKey);
SHA256_memory((char *)base64_tmp, len, (char *)SHA256digest);
htob64((char *)SHA256digest, HisPubKey, 32);
iRet=1;
}
else iRet=0;
ZeroMemory(base64_tmp, sizeof(base64_tmp));
ZeroMemory(SHA256digest, sizeof(SHA256digest));
mpz_clear(b_theKey);
mpz_clear(b_HisPubkey);
return iRet;
}
// Input: MyPrivKey = Your private key
// HisPubKey = Someones public key
// Output: MyPrivKey has been destroyed for security reasons
// HisPubKey = the secret key
int DH1080_comp(char *MyPrivKey, char *HisPubKey)
{
int i=0, len, iRet;
unsigned char SHA256digest[35], base64_tmp[160];
big b_myPrivkey, b_HisPubkey, b_theKey;
// Verify base64 strings
if((strspn(MyPrivKey, B64ABC) != strlen(MyPrivKey)) || (strspn(HisPubKey, B64ABC) != strlen(HisPubKey)))
{
memset(MyPrivKey, 0x20, strlen(MyPrivKey));
memset(HisPubKey, 0x20, strlen(HisPubKey));
return 0;
}
b_HisPubkey=mirvar(0);
b_theKey=mirvar(0);
len=b64toh(HisPubKey, base64_tmp);
bytes_to_big(len, base64_tmp, b_HisPubkey);
if(DH_verifyPubKey(b_HisPubkey))
{
b_myPrivkey=mirvar(0);
len=b64toh(MyPrivKey, base64_tmp);
bytes_to_big(len, base64_tmp, b_myPrivkey);
memset(MyPrivKey, 0x20, strlen(MyPrivKey));
powmod(b_HisPubkey, b_myPrivkey, b_prime1080, b_theKey);
mirkill(b_myPrivkey);
len=big_to_bytes(sizeof(base64_tmp), b_theKey, base64_tmp, FALSE);
SHA256_memory(base64_tmp, len, SHA256digest);
htob64(SHA256digest, HisPubKey, 32);
iRet=1;
}
else iRet=0;
ZeroMemory(base64_tmp, sizeof(base64_tmp));
ZeroMemory(SHA256digest, sizeof(SHA256digest));
mirkill(b_theKey);
mirkill(b_HisPubkey);
return iRet;
}