public SM2_SM3Digest(SM2_SM3Digest t) : base(t)
{
Array.Copy(t.X, 0, X, 0, t.X.Length);
xOff = t.xOff;
Array.Copy(t.v, 0, v, 0, t.v.Length);
}
private void NextKey()
{
var sm3Keycur = new SM2_SM3Digest(sm3keybase);
sm3Keycur.Update((byte)(ct >> 24 & 0xff));
sm3Keycur.Update((byte)(ct >> 16 & 0xff));
sm3Keycur.Update((byte)(ct >> 8 & 0xff));
sm3Keycur.Update((byte)(ct & 0xff));
sm3Keycur.DoFinal(key, 0);
keyOff = 0;
ct++;
}
private void Reset()
{
sm3keybase = new SM2_SM3Digest();
sm3c3 = new SM2_SM3Digest();
var p = byteConvert32Bytes(p2.Normalize().XCoord.ToBigInteger());
sm3keybase.BlockUpdate(p, 0, p.Length);
sm3c3.BlockUpdate(p, 0, p.Length);
p = byteConvert32Bytes(p2.Normalize().YCoord.ToBigInteger());
sm3keybase.BlockUpdate(p, 0, p.Length);
ct = 1;
NextKey();
}
public virtual byte[] Sm2GetZ(byte[] userId, ECPoint userKey)
{
SM2_SM3Digest sm3 = new SM2_SM3Digest();
byte[] p;
// userId length
int len = userId.Length * 8;
sm3.Update((byte)(len >> 8 & 0xff)); //sm3.Update((byte) (len >> 8 & 0x00ff));
sm3.Update((byte)(len & 0xff)); //sm3.Update((byte) (len & 0x00ff));
// userId
sm3.BlockUpdate(userId, 0, userId.Length);
// a,b
p = ecc_a.ToByteArray();
sm3.BlockUpdate(p, 0, p.Length);
p = ecc_b.ToByteArray();
sm3.BlockUpdate(p, 0, p.Length);
// gx,gy
p = ecc_gx.ToByteArray();
sm3.BlockUpdate(p, 0, p.Length);
p = ecc_gy.ToByteArray();
sm3.BlockUpdate(p, 0, p.Length);
var a0 = userKey.XCoord;
var a1 = a0.ToBigInteger();
var a2 = a1.ToByteArray();
// x,y
p = userKey.AffineXCoord.ToBigInteger().ToByteArray();
sm3.BlockUpdate(p, 0, p.Length);
p = userKey.AffineYCoord.ToBigInteger().ToByteArray();
sm3.BlockUpdate(p, 0, p.Length);
// Z
byte[] md = new byte[sm3.GetDigestSize()];
sm3.DoFinal(md, 0);
return(md);
}
