public static API.ECDH_Struct GetECDHKeys()
{
API.ECDH_Struct ECDH = new API.ECDH_Struct();
byte[] PrivateKey = new byte[1024];
byte[] PublicKey = new byte[1024];
byte[] Sharekey = new byte[16];
byte[] SvrPubKey = API.HexStrToByteArray("04EBCA94D733E399B2DB96EACDD3F69A8BB0F74224E2B44E3357812211D2E62EFBC91BB553098E25E33A799ADC7F76FEB208DA7C6522CDB0719A305180CC54A82E");
var eckey = OpenSSL.EC_KEY_new_by_curve_name(415);
if (eckey == IntPtr.Zero)
{
return(ECDH);
}
var res = OpenSSL.EC_KEY_generate_key(eckey);
var ec_group = OpenSSL.EC_KEY_get0_group(eckey);
var ec_point = OpenSSL.EC_KEY_get0_public_key(eckey);
var PublicKeyLen = OpenSSL.EC_POINT_point2oct(ec_group, (System.IntPtr)ec_point, 4, PublicKey, 65, (System.IntPtr) 0);
Array.Resize(ref PublicKey, PublicKeyLen);
ECDH.PublicKey = PublicKey;
ec_point = (int)OpenSSL.EC_KEY_get0_private_key(eckey);
var PrivateKeyLen = OpenSSL.BN_bn2mpi((System.IntPtr)ec_point, PrivateKey);
Array.Resize(ref PrivateKey, (System.Int32)PrivateKeyLen);
ECDH.PrivateKey = PrivateKey;
eckey = OpenSSL.EC_KEY_new_by_curve_name(415);
if (eckey == IntPtr.Zero)
{
return(ECDH);
}
var bn = OpenSSL.BN_new();
OpenSSL.BN_mpi2bn(ECDH.PrivateKey, ECDH.PrivateKey.Length, bn);
OpenSSL.EC_KEY_set_private_key(eckey, bn);
OpenSSL.BN_free(bn);
ec_group = OpenSSL.EC_KEY_get0_group(eckey);
ec_point = (int)OpenSSL.EC_POINT_new(ec_group);
OpenSSL.EC_POINT_oct2point(ec_group, (System.IntPtr)ec_point, SvrPubKey, SvrPubKey.Length, (System.IntPtr) 0);
OpenSSL.ECDH_compute_key(Sharekey, 16, (System.IntPtr)ec_point, eckey, IntPtr.Zero);
ECDH.Sharekey = API.MD5Hash(Sharekey);
return(ECDH);
}
public static byte[] GetECDHKeysEx(byte[] peerRawPublicKey, byte[] PublicKey, byte[] PrivateKey)
{
API.ECDH_Struct ECDH = new API.ECDH_Struct();
//Dim PrivateKey(1023) As Byte
// Dim PublicKey(1023) As Byte
//Dim Sharekey(15) As Byte
var ec_key = OpenSSL.EC_KEY_new_by_curve_name(415);
var bn = OpenSSL.BN_new();
OpenSSL.BN_mpi2bn(PrivateKey, PrivateKey.Length, bn);
OpenSSL.EC_KEY_set_private_key(ec_key, bn);
OpenSSL.BN_free(bn);
var ec_group = OpenSSL.EC_KEY_get0_group(ec_key);
var ec_point = OpenSSL.EC_POINT_new(ec_group);
OpenSSL.EC_POINT_oct2point(ec_group, ec_point, peerRawPublicKey, peerRawPublicKey.Length, (System.IntPtr) 0);
OpenSSL.ECDH_compute_key(PublicKey, 16, ec_point, ec_key, (System.IntPtr) 0);
return(API.MD5Hash(PublicKey));
}