public ECFieldElement fromBigInteger(BigInteger x) { return new SM2P256V1FieldElement(x); }
public ECPoint lookup(int index) { int[] x = Nat256.create(), y = Nat256.create(); int pos = 0; for (int i = 0; i < len; ++i) { int MASK = ((i ^ index) - 1) >> 31; for (int j = 0; j < FE_INTS; ++j) { x[j] ^= table[pos + j] & MASK; y[j] ^= table[pos + FE_INTS + j] & MASK; } pos += (FE_INTS * 2); } return createRawPoint(new SM2P256V1FieldElement(x), new SM2P256V1FieldElement(y), false); } };
public ECFieldElement multiply(ECFieldElement b) { int[] z = Nat256.create(); SM2P256V1Field.multiply(x, ((SM2P256V1FieldElement)b).x, z); return new SM2P256V1FieldElement(z); }
public ECFieldElement square() { int[] z = Nat256.create(); SM2P256V1Field.square(x, z); return new SM2P256V1FieldElement(z); }
public ECFieldElement invert() { // return new SM2P256V1FieldElement(toBigInteger().modInverse(Q)); int[] z = Nat256.create(); Mod.invert(SM2P256V1Field.P, x, z); return new SM2P256V1FieldElement(z); }
public ECFieldElement addOne() { int[] z = Nat256.create(); SM2P256V1Field.addOne(x, z); return new SM2P256V1FieldElement(z); }
public ECFieldElement negate() { int[] z = Nat256.create(); SM2P256V1Field.negate(x, z); return new SM2P256V1FieldElement(z); }
public ECFieldElement add(ECFieldElement b) { int[] z = Nat256.create(); SM2P256V1Field.add(x, ((SM2P256V1FieldElement)b).x, z); return new SM2P256V1FieldElement(z); }
public ECFieldElement subtract(ECFieldElement b) { int[] z = Nat256.create(); SM2P256V1Field.subtract(x, ((SM2P256V1FieldElement)b).x, z); return new SM2P256V1FieldElement(z); }
public ECFieldElement divide(ECFieldElement b) { // return multiply(b.invert()); int[] z = Nat256.create(); Mod.invert(SM2P256V1Field.P, ((SM2P256V1FieldElement)b).x, z); SM2P256V1Field.multiply(z, x, z); return new SM2P256V1FieldElement(z); }
return createRawPoint(new SM2P256V1FieldElement(x), new SM2P256V1FieldElement(y), false);
SM2P256V1Field.reduce32(c, t1); SM2P256V1FieldElement X3 = new SM2P256V1FieldElement(T); SM2P256V1Field.square(M, X3.x); SM2P256V1Field.subtract(X3.x, S, X3.x); SM2P256V1Field.subtract(X3.x, S, X3.x); SM2P256V1FieldElement Y3 = new SM2P256V1FieldElement(S); SM2P256V1Field.subtract(S, X3.x, Y3.x); SM2P256V1Field.multiply(Y3.x, M, Y3.x); SM2P256V1Field.subtract(Y3.x, t1, Y3.x); SM2P256V1FieldElement Z3 = new SM2P256V1FieldElement(M); SM2P256V1Field.twice(Y1.x, Z3.x); if (!Z1IsOne)
SM2P256V1Field.reduce32(c, G); SM2P256V1FieldElement X3 = new SM2P256V1FieldElement(t4); SM2P256V1Field.square(R, X3.x); SM2P256V1Field.subtract(X3.x, G, X3.x); SM2P256V1FieldElement Y3 = new SM2P256V1FieldElement(G); SM2P256V1Field.subtract(V, X3.x, Y3.x); SM2P256V1Field.multiplyAddToExt(Y3.x, R, tt1); SM2P256V1Field.reduce(tt1, Y3.x); SM2P256V1FieldElement Z3 = new SM2P256V1FieldElement(H); if (!Z1IsOne)
SM2P256V1Field.square(t1, t2); return Nat256.eq(x1, t2) ? new SM2P256V1FieldElement(t1) : null;