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SUSE:SLE-15-SP7:GA
libcryptopp.31969
cve-2019-14318-CryptoPP564.patch
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File cve-2019-14318-CryptoPP564.patch of Package libcryptopp.31969
--- ecp.cpp +++ ecp.cpp @@ -24,6 +24,498 @@ { return P.identity ? P : ECP::Point(mr.ConvertOut(P.x), mr.ConvertOut(P.y)); } + + +inline Integer IdentityToInteger(bool val) +{ + return val ? Integer::One() : Integer::Zero(); +} + +struct ProjectivePoint +{ + ProjectivePoint() {} + ProjectivePoint(const Integer &x, const Integer &y, const Integer &z) + : x(x), y(y), z(z) {} + + Integer x, y, z; +}; + +/// \brief Addition and Double functions +/// \sa <A HREF="https://eprint.iacr.org/2015/1060.pdf">Complete +/// addition formulas for prime order elliptic curves</A> +struct AdditionFunction +{ + explicit AdditionFunction(const ECP::Field& field, + const ECP::FieldElement &a, const ECP::FieldElement &b, ECP::Point &r); + + // Double(P) + ECP::Point operator()(const ECP::Point& P) const; + // Add(P, Q) + ECP::Point operator()(const ECP::Point& P, const ECP::Point& Q) const; + +protected: + /// \brief Parameters and representation for Addition + /// \details Addition and Doubling will use different algorithms, + /// depending on the <tt>A</tt> coefficient and the representation + /// (Affine or Montgomery with precomputation). + enum Alpha { + /// \brief Coefficient A is 0 + A_0 = 1, + /// \brief Coefficient A is -3 + A_3 = 2, + /// \brief Coefficient A is arbitrary + A_Star = 4, + /// \brief Representation is Montgomery + A_Montgomery = 8 + }; + + const ECP::Field& field; + const ECP::FieldElement &a, &b; + ECP::Point &R; + + Alpha m_alpha; +}; + +#define X p.x +#define Y p.y +#define Z p.z + +#define X1 p.x +#define Y1 p.y +#define Z1 p.z + +#define X2 q.x +#define Y2 q.y +#define Z2 q.z + +#define X3 r.x +#define Y3 r.y +#define Z3 r.z + +AdditionFunction::AdditionFunction(const ECP::Field& field, + const ECP::FieldElement &a, const ECP::FieldElement &b, ECP::Point &r) + : field(field), a(a), b(b), R(r), m_alpha(static_cast<Alpha>(0)) +{ + if (field.IsMontgomeryRepresentation()) + { + m_alpha = A_Montgomery; + } + else + { + if (a == 0) + { + m_alpha = A_0; + } + else if (a == -3 || (a - field.GetModulus()) == -3) + { + m_alpha = A_3; + } + else + { + m_alpha = A_Star; + } + } +} + +ECP::Point AdditionFunction::operator()(const ECP::Point& P) const +{ + if (m_alpha == A_3) + { + // Gyrations attempt to maintain constant-timeness + // We need either (P.x, P.y, 1) or (0, 1, 0). + const Integer x = P.x * IdentityToInteger(!P.identity); + const Integer y = P.y * IdentityToInteger(!P.identity) + 1 * IdentityToInteger(P.identity); + const Integer z = 1 * IdentityToInteger(!P.identity); + + ProjectivePoint p(x, y, z), r; + + ECP::FieldElement t0 = field.Square(X); + ECP::FieldElement t1 = field.Square(Y); + ECP::FieldElement t2 = field.Square(Z); + ECP::FieldElement t3 = field.Multiply(X, Y); + t3 = field.Add(t3, t3); + Z3 = field.Multiply(X, Z); + Z3 = field.Add(Z3, Z3); + Y3 = field.Multiply(b, t2); + Y3 = field.Subtract(Y3, Z3); + X3 = field.Add(Y3, Y3); + Y3 = field.Add(X3, Y3); + X3 = field.Subtract(t1, Y3); + Y3 = field.Add(t1, Y3); + Y3 = field.Multiply(X3, Y3); + X3 = field.Multiply(X3, t3); + t3 = field.Add(t2, t2); + t2 = field.Add(t2, t3); + Z3 = field.Multiply(b, Z3); + Z3 = field.Subtract(Z3, t2); + Z3 = field.Subtract(Z3, t0); + t3 = field.Add(Z3, Z3); + Z3 = field.Add(Z3, t3); + t3 = field.Add(t0, t0); + t0 = field.Add(t3, t0); + t0 = field.Subtract(t0, t2); + t0 = field.Multiply(t0, Z3); + Y3 = field.Add(Y3, t0); + t0 = field.Multiply(Y, Z); + t0 = field.Add(t0, t0); + Z3 = field.Multiply(t0, Z3); + X3 = field.Subtract(X3, Z3); + Z3 = field.Multiply(t0, t1); + Z3 = field.Add(Z3, Z3); + Z3 = field.Add(Z3, Z3); + + const ECP::FieldElement inv = field.MultiplicativeInverse(Z3.IsZero() ? Integer::One() : Z3); + X3 = field.Multiply(X3, inv); Y3 = field.Multiply(Y3, inv); + + // More gyrations + R.x = X3*Z3.NotZero(); + R.y = Y3*Z3.NotZero(); + R.identity = Z3.IsZero(); + + return R; + } + else if (m_alpha == A_0) + { + // Gyrations attempt to maintain constant-timeness + // We need either (P.x, P.y, 1) or (0, 1, 0). + const Integer x = P.x * IdentityToInteger(!P.identity); + const Integer y = P.y * IdentityToInteger(!P.identity) + 1 * IdentityToInteger(P.identity); + const Integer z = 1 * IdentityToInteger(!P.identity); + + ProjectivePoint p(x, y, z), r; + const ECP::FieldElement b3 = field.Multiply(b, 3); + + ECP::FieldElement t0 = field.Square(Y); + Z3 = field.Add(t0, t0); + Z3 = field.Add(Z3, Z3); + Z3 = field.Add(Z3, Z3); + ECP::FieldElement t1 = field.Add(Y, Z); + ECP::FieldElement t2 = field.Square(Z); + t2 = field.Multiply(b3, t2); + X3 = field.Multiply(t2, Z3); + Y3 = field.Add(t0, t2); + Z3 = field.Multiply(t1, Z3); + t1 = field.Add(t2, t2); + t2 = field.Add(t1, t2); + t0 = field.Subtract(t0, t2); + Y3 = field.Multiply(t0, Y3); + Y3 = field.Add(X3, Y3); + t1 = field.Multiply(X, Y); + X3 = field.Multiply(t0, t1); + X3 = field.Add(X3, X3); + + const ECP::FieldElement inv = field.MultiplicativeInverse(Z3.IsZero() ? Integer::One() : Z3); + X3 = field.Multiply(X3, inv); Y3 = field.Multiply(Y3, inv); + + // More gyrations + R.x = X3*Z3.NotZero(); + R.y = Y3*Z3.NotZero(); + R.identity = Z3.IsZero(); + + return R; + } + else if (m_alpha == A_Star) + { + // Gyrations attempt to maintain constant-timeness + // We need either (P.x, P.y, 1) or (0, 1, 0). + const Integer x = P.x * IdentityToInteger(!P.identity); + const Integer y = P.y * IdentityToInteger(!P.identity) + 1 * IdentityToInteger(P.identity); + const Integer z = 1 * IdentityToInteger(!P.identity); + + ProjectivePoint p(x, y, z), r; + const ECP::FieldElement b3 = field.Multiply(b, 3); + + ECP::FieldElement t0 = field.Square(Y); + Z3 = field.Add(t0, t0); + Z3 = field.Add(Z3, Z3); + Z3 = field.Add(Z3, Z3); + ECP::FieldElement t1 = field.Add(Y, Z); + ECP::FieldElement t2 = field.Square(Z); + t2 = field.Multiply(b3, t2); + X3 = field.Multiply(t2, Z3); + Y3 = field.Add(t0, t2); + Z3 = field.Multiply(t1, Z3); + t1 = field.Add(t2, t2); + t2 = field.Add(t1, t2); + t0 = field.Subtract(t0, t2); + Y3 = field.Multiply(t0, Y3); + Y3 = field.Add(X3, Y3); + t1 = field.Multiply(X, Y); + X3 = field.Multiply(t0, t1); + X3 = field.Add(X3, X3); + + const ECP::FieldElement inv = field.MultiplicativeInverse(Z3.IsZero() ? Integer::One() : Z3); + X3 = field.Multiply(X3, inv); Y3 = field.Multiply(Y3, inv); + + // More gyrations + R.x = X3*Z3.NotZero(); + R.y = Y3*Z3.NotZero(); + R.identity = Z3.IsZero(); + + return R; + } + else // A_Montgomery + { + // More gyrations + bool identity = !!(P.identity + (P.y == field.Identity())); + + ECP::FieldElement t = field.Square(P.x); + t = field.Add(field.Add(field.Double(t), t), a); + t = field.Divide(t, field.Double(P.y)); + ECP::FieldElement x = field.Subtract(field.Subtract(field.Square(t), P.x), P.x); + R.y = field.Subtract(field.Multiply(t, field.Subtract(P.x, x)), P.y); + R.x.swap(x); + + // More gyrations + R.x *= IdentityToInteger(!identity); + R.y *= IdentityToInteger(!identity); + R.identity = identity; + + return R; + } +} + +ECP::Point AdditionFunction::operator()(const ECP::Point& P, const ECP::Point& Q) const +{ + if (m_alpha == A_3) + { + // Gyrations attempt to maintain constant-timeness + // We need either (P.x, P.y, 1) or (0, 1, 0). + const Integer x1 = P.x * IdentityToInteger(!P.identity); + const Integer y1 = P.y * IdentityToInteger(!P.identity) + 1 * IdentityToInteger(P.identity); + const Integer z1 = 1 * IdentityToInteger(!P.identity); + + const Integer x2 = Q.x * IdentityToInteger(!Q.identity); + const Integer y2 = Q.y * IdentityToInteger(!Q.identity) + 1 * IdentityToInteger(Q.identity); + const Integer z2 = 1 * IdentityToInteger(!Q.identity); + + ProjectivePoint p(x1, y1, z1), q(x2, y2, z2), r; + + ECP::FieldElement t0 = field.Multiply(X1, X2); + ECP::FieldElement t1 = field.Multiply(Y1, Y2); + ECP::FieldElement t2 = field.Multiply(Z1, Z2); + ECP::FieldElement t3 = field.Add(X1, Y1); + ECP::FieldElement t4 = field.Add(X2, Y2); + t3 = field.Multiply(t3, t4); + t4 = field.Add(t0, t1); + t3 = field.Subtract(t3, t4); + t4 = field.Add(Y1, Z1); + X3 = field.Add(Y2, Z2); + t4 = field.Multiply(t4, X3); + X3 = field.Add(t1, t2); + t4 = field.Subtract(t4, X3); + X3 = field.Add(X1, Z1); + Y3 = field.Add(X2, Z2); + X3 = field.Multiply(X3, Y3); + Y3 = field.Add(t0, t2); + Y3 = field.Subtract(X3, Y3); + Z3 = field.Multiply(b, t2); + X3 = field.Subtract(Y3, Z3); + Z3 = field.Add(X3, X3); + X3 = field.Add(X3, Z3); + Z3 = field.Subtract(t1, X3); + X3 = field.Add(t1, X3); + Y3 = field.Multiply(b, Y3); + t1 = field.Add(t2, t2); + t2 = field.Add(t1, t2); + Y3 = field.Subtract(Y3, t2); + Y3 = field.Subtract(Y3, t0); + t1 = field.Add(Y3, Y3); + Y3 = field.Add(t1, Y3); + t1 = field.Add(t0, t0); + t0 = field.Add(t1, t0); + t0 = field.Subtract(t0, t2); + t1 = field.Multiply(t4, Y3); + t2 = field.Multiply(t0, Y3); + Y3 = field.Multiply(X3, Z3); + Y3 = field.Add(Y3, t2); + X3 = field.Multiply(t3, X3); + X3 = field.Subtract(X3, t1); + Z3 = field.Multiply(t4, Z3); + t1 = field.Multiply(t3, t0); + Z3 = field.Add(Z3, t1); + + const ECP::FieldElement inv = field.MultiplicativeInverse(Z3.IsZero() ? Integer::One() : Z3); + X3 = field.Multiply(X3, inv); Y3 = field.Multiply(Y3, inv); + + // More gyrations + R.x = X3*Z3.NotZero(); + R.y = Y3*Z3.NotZero(); + R.identity = Z3.IsZero(); + + return R; + } + else if (m_alpha == A_0) + { + // Gyrations attempt to maintain constant-timeness + // We need either (P.x, P.y, 1) or (0, 1, 0). + const Integer x1 = P.x * IdentityToInteger(!P.identity); + const Integer y1 = P.y * IdentityToInteger(!P.identity) + 1 * IdentityToInteger(P.identity); + const Integer z1 = 1 * IdentityToInteger(!P.identity); + + const Integer x2 = Q.x * IdentityToInteger(!Q.identity); + const Integer y2 = Q.y * IdentityToInteger(!Q.identity) + 1 * IdentityToInteger(Q.identity); + const Integer z2 = 1 * IdentityToInteger(!Q.identity); + + ProjectivePoint p(x1, y1, z1), q(x2, y2, z2), r; + const ECP::FieldElement b3 = field.Multiply(b, 3); + + ECP::FieldElement t0 = field.Square(Y); + Z3 = field.Add(t0, t0); + Z3 = field.Add(Z3, Z3); + Z3 = field.Add(Z3, Z3); + ECP::FieldElement t1 = field.Add(Y, Z); + ECP::FieldElement t2 = field.Square(Z); + t2 = field.Multiply(b3, t2); + X3 = field.Multiply(t2, Z3); + Y3 = field.Add(t0, t2); + Z3 = field.Multiply(t1, Z3); + t1 = field.Add(t2, t2); + t2 = field.Add(t1, t2); + t0 = field.Subtract(t0, t2); + Y3 = field.Multiply(t0, Y3); + Y3 = field.Add(X3, Y3); + t1 = field.Multiply(X, Y); + X3 = field.Multiply(t0, t1); + X3 = field.Add(X3, X3); + + const ECP::FieldElement inv = field.MultiplicativeInverse(Z3.IsZero() ? Integer::One() : Z3); + X3 = field.Multiply(X3, inv); Y3 = field.Multiply(Y3, inv); + + // More gyrations + R.x = X3*Z3.NotZero(); + R.y = Y3*Z3.NotZero(); + R.identity = Z3.IsZero(); + + return R; + } + else if (m_alpha == A_Star) + { + // Gyrations attempt to maintain constant-timeness + // We need either (P.x, P.y, 1) or (0, 1, 0). + const Integer x1 = P.x * IdentityToInteger(!P.identity); + const Integer y1 = P.y * IdentityToInteger(!P.identity) + 1 * IdentityToInteger(P.identity); + const Integer z1 = 1 * IdentityToInteger(!P.identity); + + const Integer x2 = Q.x * IdentityToInteger(!Q.identity); + const Integer y2 = Q.y * IdentityToInteger(!Q.identity) + 1 * IdentityToInteger(Q.identity); + const Integer z2 = 1 * IdentityToInteger(!Q.identity); + + ProjectivePoint p(x1, y1, z1), q(x2, y2, z2), r; + const ECP::FieldElement b3 = field.Multiply(b, 3); + + ECP::FieldElement t0 = field.Multiply(X1, X2); + ECP::FieldElement t1 = field.Multiply(Y1, Y2); + ECP::FieldElement t2 = field.Multiply(Z1, Z2); + ECP::FieldElement t3 = field.Add(X1, Y1); + ECP::FieldElement t4 = field.Add(X2, Y2); + t3 = field.Multiply(t3, t4); + t4 = field.Add(t0, t1); + t3 = field.Subtract(t3, t4); + t4 = field.Add(X1, Z1); + ECP::FieldElement t5 = field.Add(X2, Z2); + t4 = field.Multiply(t4, t5); + t5 = field.Add(t0, t2); + t4 = field.Subtract(t4, t5); + t5 = field.Add(Y1, Z1); + X3 = field.Add(Y2, Z2); + t5 = field.Multiply(t5, X3); + X3 = field.Add(t1, t2); + t5 = field.Subtract(t5, X3); + Z3 = field.Multiply(a, t4); + X3 = field.Multiply(b3, t2); + Z3 = field.Add(X3, Z3); + X3 = field.Subtract(t1, Z3); + Z3 = field.Add(t1, Z3); + Y3 = field.Multiply(X3, Z3); + t1 = field.Add(t0, t0); + t1 = field.Add(t1, t0); + t2 = field.Multiply(a, t2); + t4 = field.Multiply(b3, t4); + t1 = field.Add(t1, t2); + t2 = field.Subtract(t0, t2); + t2 = field.Multiply(a, t2); + t4 = field.Add(t4, t2); + t0 = field.Multiply(t1, t4); + Y3 = field.Add(Y3, t0); + t0 = field.Multiply(t5, t4); + X3 = field.Multiply(t3, X3); + X3 = field.Subtract(X3, t0); + t0 = field.Multiply(t3, t1); + Z3 = field.Multiply(t5, Z3); + Z3 = field.Add(Z3, t0); + + const ECP::FieldElement inv = field.MultiplicativeInverse(Z3.IsZero() ? Integer::One() : Z3); + X3 = field.Multiply(X3, inv); Y3 = field.Multiply(Y3, inv); + + // More gyrations + R.x = X3*Z3.NotZero(); + R.y = Y3*Z3.NotZero(); + R.identity = Z3.IsZero(); + + return R; + } + else // A_Montgomery + { + // More gyrations + bool return_Q = P.identity; + bool return_P = Q.identity; + bool double_P = field.Equal(P.x, Q.x) && field.Equal(P.y, Q.y); + bool identity = field.Equal(P.x, Q.x) && !field.Equal(P.y, Q.y); + + // This code taken from Double(P) for below + identity = !!((double_P * (P.identity + (P.y == field.Identity()))) + identity); + + ECP::Point S = R; + if (double_P) + { + // This code taken from Double(P) + ECP::FieldElement t = field.Square(P.x); + t = field.Add(field.Add(field.Double(t), t), a); + t = field.Divide(t, field.Double(P.y)); + ECP::FieldElement x = field.Subtract(field.Subtract(field.Square(t), P.x), P.x); + R.y = field.Subtract(field.Multiply(t, field.Subtract(P.x, x)), P.y); + R.x.swap(x); + } + else + { + // Original Add(P,Q) code + ECP::FieldElement t = field.Subtract(Q.y, P.y); + t = field.Divide(t, field.Subtract(Q.x, P.x)); + ECP::FieldElement x = field.Subtract(field.Subtract(field.Square(t), P.x), Q.x); + R.y = field.Subtract(field.Multiply(t, field.Subtract(P.x, x)), P.y); + R.x.swap(x); + } + + // More gyrations + R.x = R.x * IdentityToInteger(!identity); + R.y = R.y * IdentityToInteger(!identity); + R.identity = identity; + + if (return_Q) + return (R = S), Q; + else if (return_P) + return (R = S), P; + else + return (S = R), R; + } +} + +#undef X +#undef Y +#undef Z + +#undef X1 +#undef Y1 +#undef Z1 + +#undef X2 +#undef Y2 +#undef Z2 + +#undef X3 +#undef Y3 +#undef Z3 NAMESPACE_END ECP::ECP(const ECP &ecp, bool convertToMontgomeryRepresentation) @@ -219,34 +711,14 @@ const ECP::Point& ECP::Add(const Point &P, const Point &Q) const { - if (P.identity) return Q; - if (Q.identity) return P; - if (GetField().Equal(P.x, Q.x)) - return GetField().Equal(P.y, Q.y) ? Double(P) : Identity(); - - FieldElement t = GetField().Subtract(Q.y, P.y); - t = GetField().Divide(t, GetField().Subtract(Q.x, P.x)); - FieldElement x = GetField().Subtract(GetField().Subtract(GetField().Square(t), P.x), Q.x); - m_R.y = GetField().Subtract(GetField().Multiply(t, GetField().Subtract(P.x, x)), P.y); - - m_R.x.swap(x); - m_R.identity = false; - return m_R; + AdditionFunction add(GetField(), m_a, m_b, m_R); + return (m_R = add(P, Q)); } const ECP::Point& ECP::Double(const Point &P) const { - if (P.identity || P.y==GetField().Identity()) return Identity(); - - FieldElement t = GetField().Square(P.x); - t = GetField().Add(GetField().Add(GetField().Double(t), t), m_a); - t = GetField().Divide(t, GetField().Double(P.y)); - FieldElement x = GetField().Subtract(GetField().Subtract(GetField().Square(t), P.x), P.x); - m_R.y = GetField().Subtract(GetField().Multiply(t, GetField().Subtract(P.x, x)), P.y); - - m_R.x.swap(x); - m_R.identity = false; - return m_R; + AdditionFunction add(GetField(), m_a, m_b, m_R); + return (m_R = add(P)); } template <class T, class Iterator> void ParallelInvert(const AbstractRing<T> &ring, Iterator begin, Iterator end) @@ -286,15 +758,6 @@ } } -struct ProjectivePoint -{ - ProjectivePoint() {} - ProjectivePoint(const Integer &x, const Integer &y, const Integer &z) - : x(x), y(y), z(z) {} - - Integer x,y,z; -}; - class ProjectiveDoubling { public: --- pubkey.h +++ pubkey.h @@ -1497,9 +1497,19 @@ // after virtual machine rollback if (rng.CanIncorporateEntropy()) rng.IncorporateEntropy(representative, representative.size()); + Integer k(rng, 1, params.GetSubgroupOrder()-1); + const Integer& q = params.GetSubgroupOrder(); + + // Due to timing attack on nonce length by Jancar + // https://github.com/weidai11/cryptopp/issues/869 + Integer ks = k + q; + if (ks.BitCount() == q.BitCount()) { + ks += q; + } + Integer r, s; - r = params.ConvertElementToInteger(params.ExponentiateBase(k)); + r = params.ConvertElementToInteger(params.ExponentiateBase(ks)); alg.Sign(params, key.GetPrivateExponent(), k, e, r, s); /*
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