13128051110

Committed 03 Feb 2025 11:15PM UTC coverage: 91.228% (-0.003%) from 91.231%

Build # 13128051110

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Commit Message

Merge pull request #4630 from randombit/jack/just-for-you-rene

Add EC_Group::engine

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94.81

/src/lib/pubkey/ec_group/ec_inner_data.cpp

/*
* (C) 2024 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/internal/ec_inner_data.h>

#include <botan/der_enc.h>
#include <botan/internal/ec_inner_pc.h>
#include <botan/internal/fmt.h>
#include <botan/internal/pcurves.h>

#if defined(BOTAN_HAS_LEGACY_EC_POINT)
   #include <botan/internal/ec_inner_bn.h>
   #include <botan/internal/point_mul.h>
#endif

namespace Botan {

EC_Group_Data::~EC_Group_Data() = default;

// Note this constructor *does not* initialize m_curve, m_base_point or m_base_mult
EC_Group_Data::EC_Group_Data(const BigInt& p,
                             const BigInt& a,
                             const BigInt& b,
                             const BigInt& g_x,
                             const BigInt& g_y,
                             const BigInt& order,
                             const BigInt& cofactor,
                             const OID& oid,
                             EC_Group_Source source) :
      m_p(p),
      m_a(a),
      m_b(b),
      m_g_x(g_x),
      m_g_y(g_y),
      m_order(order),
      m_cofactor(cofactor),
#if defined(BOTAN_HAS_LEGACY_EC_POINT)
      m_mod_field(Modular_Reducer::for_public_modulus(p)),
      m_mod_order(Modular_Reducer::for_public_modulus(order)),
      m_monty(m_p, m_mod_field),
#endif
      m_oid(oid),
      m_p_words(p.sig_words()),
      m_p_bits(p.bits()),
      m_order_bits(order.bits()),
      m_order_bytes((m_order_bits + 7) / 8),
      m_a_is_minus_3(a == p - 3),
      m_a_is_zero(a.is_zero()),
      m_has_cofactor(m_cofactor != 1),
      m_order_is_less_than_p(m_order < p),
      m_source(source) {
   if(!m_oid.empty()) {
      DER_Encoder der(m_der_named_curve);
      der.encode(m_oid);

      if(const auto id = PCurve::PrimeOrderCurveId::from_oid(m_oid)) {
         m_pcurve = PCurve::PrimeOrderCurve::from_id(*id);
         if(m_pcurve) {
            m_engine = EC_Group_Engine::Optimized;
         }
         // still possibly null, if the curve is supported in general but not
         // available in the build
      }
   }

#if defined(BOTAN_HAS_LEGACY_EC_POINT)
   secure_vector<word> ws;
   m_a_r = m_monty.mul(a, m_monty.R2(), ws);
   m_b_r = m_monty.mul(b, m_monty.R2(), ws);
   if(!m_pcurve) {
      m_engine = EC_Group_Engine::Legacy;
   }
#else
   if(!m_pcurve) {
      if(m_oid.empty()) {
         throw Not_Implemented("EC_Group this group is not supported in this build configuration");
      } else {
         throw Not_Implemented(
            fmt("EC_Group the group {} is not supported in this build configuration", oid.to_string()));
      }
   }
#endif
}

std::shared_ptr<EC_Group_Data> EC_Group_Data::create(const BigInt& p,
                                                     const BigInt& a,
                                                     const BigInt& b,
                                                     const BigInt& g_x,
                                                     const BigInt& g_y,
                                                     const BigInt& order,
                                                     const BigInt& cofactor,
                                                     const OID& oid,
                                                     EC_Group_Source source) {
   auto group = std::make_shared<EC_Group_Data>(p, a, b, g_x, g_y, order, cofactor, oid, source);

#if defined(BOTAN_HAS_LEGACY_EC_POINT)
   group->m_curve = CurveGFp(group.get());
   group->m_base_point = EC_Point(group->m_curve, g_x, g_y);
   if(!group->m_pcurve) {
      group->m_base_mult = std::make_unique<EC_Point_Base_Point_Precompute>(group->m_base_point, group->m_mod_order);
   }
#endif

   return group;
}

bool EC_Group_Data::params_match(const BigInt& p,
                                 const BigInt& a,
                                 const BigInt& b,
                                 const BigInt& g_x,
                                 const BigInt& g_y,
                                 const BigInt& order,
                                 const BigInt& cofactor) const {
   return (this->p() == p && this->a() == a && this->b() == b && this->order() == order &&
           this->cofactor() == cofactor && this->g_x() == g_x && this->g_y() == g_y);
}

bool EC_Group_Data::params_match(const EC_Group_Data& other) const {
   return params_match(other.p(), other.a(), other.b(), other.g_x(), other.g_y(), other.order(), other.cofactor());
}

void EC_Group_Data::set_oid(const OID& oid) {
   BOTAN_ARG_CHECK(!oid.empty(), "OID should be set");
   BOTAN_STATE_CHECK(m_oid.empty() && m_der_named_curve.empty());
   m_oid = oid;

   DER_Encoder der(m_der_named_curve);
   der.encode(m_oid);
}

std::unique_ptr<EC_Scalar_Data> EC_Group_Data::scalar_from_bytes_with_trunc(std::span<const uint8_t> bytes) const {
   const size_t bit_length = 8 * bytes.size();

   if(bit_length < order_bits()) {
      // No shifting required, but might still need to reduce by modulus
      return this->scalar_from_bytes_mod_order(bytes);
   } else {
      const size_t shift = bit_length - order_bits();

      const size_t new_length = bytes.size() - (shift / 8);
      const size_t bit_shift = shift % 8;

      if(bit_shift == 0) {
         // Easy case just read different bytes
         return this->scalar_from_bytes_mod_order(bytes.first(new_length));
      } else {
         std::vector<uint8_t> sbytes(new_length);

         uint8_t carry = 0;
         for(size_t i = 0; i != new_length; ++i) {
            const uint8_t w = bytes[i];
            sbytes[i] = (w >> bit_shift) | carry;
            carry = w << (8 - bit_shift);
         }

         return this->scalar_from_bytes_mod_order(sbytes);
      }
   }
}

std::unique_ptr<EC_Scalar_Data> EC_Group_Data::scalar_from_bytes_mod_order(std::span<const uint8_t> bytes) const {
   if(bytes.size() > 2 * order_bytes()) {
      return {};
   }

   if(m_pcurve) {
      if(auto s = m_pcurve->scalar_from_wide_bytes(bytes)) {
         return std::make_unique<EC_Scalar_Data_PC>(shared_from_this(), std::move(*s));
      } else {
         return {};
      }
   } else {
#if defined(BOTAN_HAS_LEGACY_EC_POINT)
      return std::make_unique<EC_Scalar_Data_BN>(shared_from_this(), m_mod_order.reduce(BigInt(bytes)));
#else
      throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
#endif
   }
}

std::unique_ptr<EC_Scalar_Data> EC_Group_Data::scalar_random(RandomNumberGenerator& rng) const {
   if(m_pcurve) {
      return std::make_unique<EC_Scalar_Data_PC>(shared_from_this(), m_pcurve->random_scalar(rng));
   } else {
#if defined(BOTAN_HAS_LEGACY_EC_POINT)
      return std::make_unique<EC_Scalar_Data_BN>(shared_from_this(),
                                                 BigInt::random_integer(rng, BigInt::one(), m_order));
#else
      throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
#endif
   }
}

std::unique_ptr<EC_Scalar_Data> EC_Group_Data::scalar_zero() const {
   if(m_pcurve) {
      return std::make_unique<EC_Scalar_Data_PC>(shared_from_this(), m_pcurve->scalar_zero());
   } else {
#if defined(BOTAN_HAS_LEGACY_EC_POINT)
      return std::make_unique<EC_Scalar_Data_BN>(shared_from_this(), BigInt::zero());
#else
      throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
#endif
   }
}

std::unique_ptr<EC_Scalar_Data> EC_Group_Data::scalar_one() const {
   if(m_pcurve) {
      return std::make_unique<EC_Scalar_Data_PC>(shared_from_this(), m_pcurve->scalar_one());
   } else {
#if defined(BOTAN_HAS_LEGACY_EC_POINT)
      return std::make_unique<EC_Scalar_Data_BN>(shared_from_this(), BigInt::one());
#else
      throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
#endif
   }
}

std::unique_ptr<EC_Scalar_Data> EC_Group_Data::scalar_from_bigint(const BigInt& bn) const {
   if(bn <= 0 || bn >= m_order) {
      return {};
   }

   if(m_pcurve) {
      return this->scalar_deserialize(bn.serialize(m_order_bytes));
   } else {
#if defined(BOTAN_HAS_LEGACY_EC_POINT)
      return std::make_unique<EC_Scalar_Data_BN>(shared_from_this(), bn);
#else
      throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
#endif
   }
}

std::unique_ptr<EC_Scalar_Data> EC_Group_Data::gk_x_mod_order(const EC_Scalar_Data& scalar,
                                                              RandomNumberGenerator& rng,
                                                              std::vector<BigInt>& ws) const {
   if(m_pcurve) {
      const auto& k = EC_Scalar_Data_PC::checked_ref(scalar);
      auto gk_x_mod_order = m_pcurve->base_point_mul_x_mod_order(k.value(), rng);
      return std::make_unique<EC_Scalar_Data_PC>(shared_from_this(), gk_x_mod_order);
   } else {
#if defined(BOTAN_HAS_LEGACY_EC_POINT)
      const auto& k = EC_Scalar_Data_BN::checked_ref(scalar);
      BOTAN_STATE_CHECK(m_base_mult != nullptr);
      const auto pt = m_base_mult->mul(k.value(), rng, m_order, ws);

      if(pt.is_zero()) {
         return scalar_zero();
      } else {
         return std::make_unique<EC_Scalar_Data_BN>(shared_from_this(), m_mod_order.reduce(pt.get_affine_x()));
      }
#else
      BOTAN_UNUSED(ws);
      throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
#endif
   }
}

std::unique_ptr<EC_Scalar_Data> EC_Group_Data::scalar_deserialize(std::span<const uint8_t> bytes) const {
   if(bytes.size() != m_order_bytes) {
      return nullptr;
   }

   if(m_pcurve) {
      if(auto s = m_pcurve->deserialize_scalar(bytes)) {
         return std::make_unique<EC_Scalar_Data_PC>(shared_from_this(), *s);
      } else {
         return nullptr;
      }
   } else {
#if defined(BOTAN_HAS_LEGACY_EC_POINT)
      BigInt r(bytes);

      if(r.is_zero() || r >= m_order) {
         return nullptr;
      }

      return std::make_unique<EC_Scalar_Data_BN>(shared_from_this(), std::move(r));
#else
      throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
#endif
   }
}

std::unique_ptr<EC_AffinePoint_Data> EC_Group_Data::point_deserialize(std::span<const uint8_t> bytes) const {
   try {
      if(m_pcurve) {
         if(auto pt = m_pcurve->deserialize_point(bytes)) {
            return std::make_unique<EC_AffinePoint_Data_PC>(shared_from_this(), std::move(*pt));
         } else {
            return nullptr;
         }
      } else {
#if defined(BOTAN_HAS_LEGACY_EC_POINT)
         return std::make_unique<EC_AffinePoint_Data_BN>(shared_from_this(), bytes);
#else
         throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
#endif
      }
   } catch(...) {
      return nullptr;
   }
}

std::unique_ptr<EC_AffinePoint_Data> EC_Group_Data::point_hash_to_curve_ro(std::string_view hash_fn,
                                                                           std::span<const uint8_t> input,
                                                                           std::span<const uint8_t> domain_sep) const {
   if(m_pcurve) {
      auto pt = m_pcurve->hash_to_curve_ro(hash_fn, input, domain_sep);
      return std::make_unique<EC_AffinePoint_Data_PC>(shared_from_this(), pt.to_affine());
   } else {
      throw Not_Implemented("Hash to curve is not implemented for this curve");
   }
}

std::unique_ptr<EC_AffinePoint_Data> EC_Group_Data::point_hash_to_curve_nu(std::string_view hash_fn,
                                                                           std::span<const uint8_t> input,
                                                                           std::span<const uint8_t> domain_sep) const {
   if(m_pcurve) {
      auto pt = m_pcurve->hash_to_curve_nu(hash_fn, input, domain_sep);
      return std::make_unique<EC_AffinePoint_Data_PC>(shared_from_this(), std::move(pt));
   } else {
      throw Not_Implemented("Hash to curve is not implemented for this curve");
   }
}

std::unique_ptr<EC_AffinePoint_Data> EC_Group_Data::point_g_mul(const EC_Scalar_Data& scalar,
                                                                RandomNumberGenerator& rng,
                                                                std::vector<BigInt>& ws) const {
   if(m_pcurve) {
      const auto& k = EC_Scalar_Data_PC::checked_ref(scalar);
      auto pt = m_pcurve->mul_by_g(k.value(), rng).to_affine();
      return std::make_unique<EC_AffinePoint_Data_PC>(shared_from_this(), std::move(pt));
   } else {
#if defined(BOTAN_HAS_LEGACY_EC_POINT)
      const auto& group = scalar.group();
      const auto& bn = EC_Scalar_Data_BN::checked_ref(scalar);

      BOTAN_STATE_CHECK(group->m_base_mult != nullptr);
      auto pt = group->m_base_mult->mul(bn.value(), rng, m_order, ws);
      return std::make_unique<EC_AffinePoint_Data_BN>(shared_from_this(), std::move(pt));
#else
      BOTAN_UNUSED(ws);
      throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
#endif
   }
}

std::unique_ptr<EC_AffinePoint_Data> EC_Group_Data::mul_px_qy(const EC_AffinePoint_Data& p,
                                                              const EC_Scalar_Data& x,
                                                              const EC_AffinePoint_Data& q,
                                                              const EC_Scalar_Data& y,
                                                              RandomNumberGenerator& rng) const {
   if(m_pcurve) {
      auto pt = m_pcurve->mul_px_qy(EC_AffinePoint_Data_PC::checked_ref(p).value(),
                                    EC_Scalar_Data_PC::checked_ref(x).value(),
                                    EC_AffinePoint_Data_PC::checked_ref(q).value(),
                                    EC_Scalar_Data_PC::checked_ref(y).value(),
                                    rng);

      if(pt) {
         return std::make_unique<EC_AffinePoint_Data_PC>(shared_from_this(), pt->to_affine());
      } else {
         return nullptr;
      }
   } else {
#if defined(BOTAN_HAS_LEGACY_EC_POINT)
      std::vector<BigInt> ws;
      const auto& group = p.group();

      // TODO this could be better!
      EC_Point_Var_Point_Precompute p_mul(p.to_legacy_point(), rng, ws);
      EC_Point_Var_Point_Precompute q_mul(q.to_legacy_point(), rng, ws);

      const auto order = group->order() * group->cofactor();  // See #3800

      auto px = p_mul.mul(EC_Scalar_Data_BN::checked_ref(x).value(), rng, order, ws);
      auto qy = q_mul.mul(EC_Scalar_Data_BN::checked_ref(y).value(), rng, order, ws);

      auto px_qy = px + qy;

      if(!px_qy.is_zero()) {
         px_qy.force_affine();
         return std::make_unique<EC_AffinePoint_Data_BN>(shared_from_this(), std::move(px_qy));
      } else {
         return nullptr;
      }
#else
      throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
#endif
   }
}

std::unique_ptr<EC_AffinePoint_Data> EC_Group_Data::affine_add(const EC_AffinePoint_Data& p,
                                                               const EC_AffinePoint_Data& q) const {
   if(m_pcurve) {
      auto pt = m_pcurve->point_add_mixed(
         PCurve::PrimeOrderCurve::ProjectivePoint::from_affine(EC_AffinePoint_Data_PC::checked_ref(p).value()),
         EC_AffinePoint_Data_PC::checked_ref(q).value());

      return std::make_unique<EC_AffinePoint_Data_PC>(shared_from_this(), pt.to_affine());
   } else {
#if defined(BOTAN_HAS_LEGACY_EC_POINT)
      auto pt = p.to_legacy_point() + q.to_legacy_point();
      return std::make_unique<EC_AffinePoint_Data_BN>(shared_from_this(), std::move(pt));
#else
      throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
#endif
   }
}

std::unique_ptr<EC_AffinePoint_Data> EC_Group_Data::affine_neg(const EC_AffinePoint_Data& p) const {
   if(m_pcurve) {
      auto pt = m_pcurve->point_negate(EC_AffinePoint_Data_PC::checked_ref(p).value());
      return std::make_unique<EC_AffinePoint_Data_PC>(shared_from_this(), pt);
   } else {
#if defined(BOTAN_HAS_LEGACY_EC_POINT)
      auto pt = p.to_legacy_point();
      pt.negate();  // negates in place
      return std::make_unique<EC_AffinePoint_Data_BN>(shared_from_this(), std::move(pt));
#else
      throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
#endif
   }
}

std::unique_ptr<EC_Mul2Table_Data> EC_Group_Data::make_mul2_table(const EC_AffinePoint_Data& h) const {
   if(m_pcurve) {
      return std::make_unique<EC_Mul2Table_Data_PC>(h);
   } else {
#if defined(BOTAN_HAS_LEGACY_EC_POINT)
      EC_AffinePoint_Data_BN g(shared_from_this(), this->base_point());
      return std::make_unique<EC_Mul2Table_Data_BN>(g, h);
#else
      throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
#endif
   }
}

}  // namespace Botan

1	/*
2	* (C) 2024 Jack Lloyd
3	*
4	* Botan is released under the Simplified BSD License (see license.txt)
5	*/
6
7	#include <botan/internal/ec_inner_data.h>
8
9	#include <botan/der_enc.h>
10	#include <botan/internal/ec_inner_pc.h>
11	#include <botan/internal/fmt.h>
12	#include <botan/internal/pcurves.h>
13
14	#if defined(BOTAN_HAS_LEGACY_EC_POINT)
15	#include <botan/internal/ec_inner_bn.h>
16	#include <botan/internal/point_mul.h>
17	#endif
18
19	namespace Botan {
20
21	EC_Group_Data::~EC_Group_Data() = default;	13,939✔
22
23	// Note this constructor does not initialize m_curve, m_base_point or m_base_mult
24	EC_Group_Data::EC_Group_Data(const BigInt& p,	1,162✔
25	const BigInt& a,
26	const BigInt& b,
27	const BigInt& g_x,
28	const BigInt& g_y,
29	const BigInt& order,
30	const BigInt& cofactor,
31	const OID& oid,
32	EC_Group_Source source) :	1,162✔
33	m_p(p),	1,162✔
34	m_a(a),	1,162✔
35	m_b(b),	1,162✔
36	m_g_x(g_x),	1,162✔
37	m_g_y(g_y),	1,162✔
38	m_order(order),	1,162✔
39	m_cofactor(cofactor),	1,162✔
40	#if defined(BOTAN_HAS_LEGACY_EC_POINT)
41	m_mod_field(Modular_Reducer::for_public_modulus(p)),	1,162✔
42	m_mod_order(Modular_Reducer::for_public_modulus(order)),	1,162✔
43	m_monty(m_p, m_mod_field),	1,162✔
44	#endif
45	m_oid(oid),	1,162✔
46	m_p_words(p.sig_words()),	1,162✔
47	m_p_bits(p.bits()),	1,162✔
48	m_order_bits(order.bits()),	1,162✔
49	m_order_bytes((m_order_bits + 7) / 8),	1,162✔
50	m_a_is_minus_3(a == p - 3),	2,324✔
51	m_a_is_zero(a.is_zero()),	1,162✔
52	m_has_cofactor(m_cofactor != 1),	1,162✔
53	m_order_is_less_than_p(m_order < p),	1,162✔
54	m_source(source) {	3,486✔
55	if(!m_oid.empty()) {	1,162✔
56	DER_Encoder der(m_der_named_curve);	1,152✔
57	der.encode(m_oid);	1,152✔
58
59	if(const auto id = PCurve::PrimeOrderCurveId::from_oid(m_oid)) {	1,152✔
60	m_pcurve = PCurve::PrimeOrderCurve::from_id(*id);	913✔
61	if(m_pcurve) {	913✔
62	m_engine = EC_Group_Engine::Optimized;	913✔
63	}
64	// still possibly null, if the curve is supported in general but not
65	// available in the build
66	}
67	}	1,152✔
68
69	#if defined(BOTAN_HAS_LEGACY_EC_POINT)
70	secure_vector<word> ws;	1,162✔
71	m_a_r = m_monty.mul(a, m_monty.R2(), ws);	2,324✔
72	m_b_r = m_monty.mul(b, m_monty.R2(), ws);	2,324✔
73	if(!m_pcurve) {	1,162✔
74	m_engine = EC_Group_Engine::Legacy;	249✔
75	}
76	#else
77	if(!m_pcurve) {
78	if(m_oid.empty()) {
79	throw Not_Implemented("EC_Group this group is not supported in this build configuration");
80	} else {
81	throw Not_Implemented(
82	fmt("EC_Group the group {} is not supported in this build configuration", oid.to_string()));
83	}
84	}
85	#endif
86	}	1,162✔
87
88	std::shared_ptr<EC_Group_Data> EC_Group_Data::create(const BigInt& p,	1,162✔
89	const BigInt& a,
90	const BigInt& b,
91	const BigInt& g_x,
92	const BigInt& g_y,
93	const BigInt& order,
94	const BigInt& cofactor,
95	const OID& oid,
96	EC_Group_Source source) {
97	auto group = std::make_shared<EC_Group_Data>(p, a, b, g_x, g_y, order, cofactor, oid, source);	1,162✔
98
99	#if defined(BOTAN_HAS_LEGACY_EC_POINT)
100	group->m_curve = CurveGFp(group.get());	1,162✔
101	group->m_base_point = EC_Point(group->m_curve, g_x, g_y);	2,324✔
102	if(!group->m_pcurve) {	1,162✔
103	group->m_base_mult = std::make_unique<EC_Point_Base_Point_Precompute>(group->m_base_point, group->m_mod_order);	249✔
104	}
105	#endif
106
107	return group;	1,162✔
108	}	×
109
110	bool EC_Group_Data::params_match(const BigInt& p,	854✔
111	const BigInt& a,
112	const BigInt& b,
113	const BigInt& g_x,
114	const BigInt& g_y,
115	const BigInt& order,
116	const BigInt& cofactor) const {
117	return (this->p() == p && this->a() == a && this->b() == b && this->order() == order &&	946✔
118	this->cofactor() == cofactor && this->g_x() == g_x && this->g_y() == g_y);	937✔
119	}
120
121	bool EC_Group_Data::params_match(const EC_Group_Data& other) const {	19✔
122	return params_match(other.p(), other.a(), other.b(), other.g_x(), other.g_y(), other.order(), other.cofactor());	19✔
123	}
124
125	void EC_Group_Data::set_oid(const OID& oid) {	5✔
126	BOTAN_ARG_CHECK(!oid.empty(), "OID should be set");	5✔
127	BOTAN_STATE_CHECK(m_oid.empty() && m_der_named_curve.empty());	5✔
128	m_oid = oid;	5✔
129
130	DER_Encoder der(m_der_named_curve);	5✔
131	der.encode(m_oid);	5✔
132	}	5✔
133
134	std::unique_ptr<EC_Scalar_Data> EC_Group_Data::scalar_from_bytes_with_trunc(std::span<const uint8_t> bytes) const {	26,057✔
135	const size_t bit_length = 8 * bytes.size();	26,057✔
136
137	if(bit_length < order_bits()) {	26,057✔
138	// No shifting required, but might still need to reduce by modulus
139	return this->scalar_from_bytes_mod_order(bytes);	5,258✔
140	} else {
141	const size_t shift = bit_length - order_bits();	20,799✔
142
143	const size_t new_length = bytes.size() - (shift / 8);	20,799✔
144	const size_t bit_shift = shift % 8;	20,799✔
145
146	if(bit_shift == 0) {	20,799✔
147	// Easy case just read different bytes
148	return this->scalar_from_bytes_mod_order(bytes.first(new_length));	18,165✔
149	} else {
150	std::vector<uint8_t> sbytes(new_length);	2,634✔
151
152	uint8_t carry = 0;	2,634✔
153	for(size_t i = 0; i != new_length; ++i) {	72,006✔
154	const uint8_t w = bytes[i];	69,372✔
155	sbytes[i] = (w >> bit_shift) \| carry;	69,372✔
156	carry = w << (8 - bit_shift);	69,372✔
157	}
158
159	return this->scalar_from_bytes_mod_order(sbytes);	2,634✔
160	}	2,634✔
161	}
162	}
163
164	std::unique_ptr<EC_Scalar_Data> EC_Group_Data::scalar_from_bytes_mod_order(std::span<const uint8_t> bytes) const {	34,770✔
165	if(bytes.size() > 2 * order_bytes()) {	34,770✔
166	return {};	×
167	}
168
169	if(m_pcurve) {	34,770✔
170	if(auto s = m_pcurve->scalar_from_wide_bytes(bytes)) {	23,532✔
171	return std::make_unique<EC_Scalar_Data_PC>(shared_from_this(), std::move(*s));	23,532✔
172	} else {
173	return {};	×
174	}	23,532✔
175	} else {
176	#if defined(BOTAN_HAS_LEGACY_EC_POINT)
177	return std::make_unique<EC_Scalar_Data_BN>(shared_from_this(), m_mod_order.reduce(BigInt(bytes)));	22,476✔
178	#else
179	throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
180	#endif
181	}
182	}
183
184	std::unique_ptr<EC_Scalar_Data> EC_Group_Data::scalar_random(RandomNumberGenerator& rng) const {	44,245✔
185	if(m_pcurve) {	44,245✔
186	return std::make_unique<EC_Scalar_Data_PC>(shared_from_this(), m_pcurve->random_scalar(rng));	19,439✔
187	} else {
188	#if defined(BOTAN_HAS_LEGACY_EC_POINT)
189	return std::make_unique<EC_Scalar_Data_BN>(shared_from_this(),	49,612✔
190	BigInt::random_integer(rng, BigInt::one(), m_order));	99,224✔
191	#else
192	throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
193	#endif
194	}
195	}
196
197	std::unique_ptr<EC_Scalar_Data> EC_Group_Data::scalar_zero() const {	×
198	if(m_pcurve) {	×
199	return std::make_unique<EC_Scalar_Data_PC>(shared_from_this(), m_pcurve->scalar_zero());	×
200	} else {
201	#if defined(BOTAN_HAS_LEGACY_EC_POINT)
202	return std::make_unique<EC_Scalar_Data_BN>(shared_from_this(), BigInt::zero());	×
203	#else
204	throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
205	#endif
206	}
207	}
208
209	std::unique_ptr<EC_Scalar_Data> EC_Group_Data::scalar_one() const {	101✔
210	if(m_pcurve) {	101✔
211	return std::make_unique<EC_Scalar_Data_PC>(shared_from_this(), m_pcurve->scalar_one());	61✔
212	} else {
213	#if defined(BOTAN_HAS_LEGACY_EC_POINT)
214	return std::make_unique<EC_Scalar_Data_BN>(shared_from_this(), BigInt::one());	40✔
215	#else
216	throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
217	#endif
218	}
219	}
220
221	std::unique_ptr<EC_Scalar_Data> EC_Group_Data::scalar_from_bigint(const BigInt& bn) const {	4,481✔
222	if(bn <= 0 \|\| bn >= m_order) {	4,481✔
223	return {};	×
224	}
225
226	if(m_pcurve) {	4,481✔
227	return this->scalar_deserialize(bn.serialize(m_order_bytes));	6,746✔
228	} else {
229	#if defined(BOTAN_HAS_LEGACY_EC_POINT)
230	return std::make_unique<EC_Scalar_Data_BN>(shared_from_this(), bn);	1,108✔
231	#else
232	throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
233	#endif
234	}
235	}
236
237	std::unique_ptr<EC_Scalar_Data> EC_Group_Data::gk_x_mod_order(const EC_Scalar_Data& scalar,	3,308✔
238	RandomNumberGenerator& rng,
239	std::vector<BigInt>& ws) const {
240	if(m_pcurve) {	3,308✔
241	const auto& k = EC_Scalar_Data_PC::checked_ref(scalar);	1,687✔
242	auto gk_x_mod_order = m_pcurve->base_point_mul_x_mod_order(k.value(), rng);	1,687✔
243	return std::make_unique<EC_Scalar_Data_PC>(shared_from_this(), gk_x_mod_order);	1,687✔
244	} else {	1,687✔
245	#if defined(BOTAN_HAS_LEGACY_EC_POINT)
246	const auto& k = EC_Scalar_Data_BN::checked_ref(scalar);	1,621✔
247	BOTAN_STATE_CHECK(m_base_mult != nullptr);	1,621✔
248	const auto pt = m_base_mult->mul(k.value(), rng, m_order, ws);	1,621✔
249
250	if(pt.is_zero()) {	3,242✔
251	return scalar_zero();	×
252	} else {
253	return std::make_unique<EC_Scalar_Data_BN>(shared_from_this(), m_mod_order.reduce(pt.get_affine_x()));	3,242✔
254	}
255	#else
256	BOTAN_UNUSED(ws);
257	throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
258	#endif
259	}	1,621✔
260	}
261
262	std::unique_ptr<EC_Scalar_Data> EC_Group_Data::scalar_deserialize(std::span<const uint8_t> bytes) const {	68,620✔
263	if(bytes.size() != m_order_bytes) {	68,620✔
264	return nullptr;	5,822✔
265	}
266
267	if(m_pcurve) {	62,798✔
268	if(auto s = m_pcurve->deserialize_scalar(bytes)) {	46,900✔
269	return std::make_unique<EC_Scalar_Data_PC>(shared_from_this(), *s);	44,715✔
270	} else {
271	return nullptr;	2,185✔
272	}	46,900✔
273	} else {
274	#if defined(BOTAN_HAS_LEGACY_EC_POINT)
275	BigInt r(bytes);	15,898✔
276
277	if(r.is_zero() \|\| r >= m_order) {	31,796✔
278	return nullptr;	716✔
279	}
280
281	return std::make_unique<EC_Scalar_Data_BN>(shared_from_this(), std::move(r));	15,182✔
282	#else
283	throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
284	#endif
285	}	15,898✔
286	}
287
288	std::unique_ptr<EC_AffinePoint_Data> EC_Group_Data::point_deserialize(std::span<const uint8_t> bytes) const {	44,417✔
289	try {	44,417✔
290	if(m_pcurve) {	44,417✔
291	if(auto pt = m_pcurve->deserialize_point(bytes)) {	33,027✔
292	return std::make_unique<EC_AffinePoint_Data_PC>(shared_from_this(), std::move(*pt));	26,910✔
293	} else {
294	return nullptr;	6,117✔
295	}	33,027✔
296	} else {
297	#if defined(BOTAN_HAS_LEGACY_EC_POINT)
298	return std::make_unique<EC_AffinePoint_Data_BN>(shared_from_this(), bytes);	11,652✔
299	#else
300	throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
301	#endif
302	}
303	} catch(...) {	262✔
304	return nullptr;	262✔
305	}	262✔
306	}
307
308	std::unique_ptr<EC_AffinePoint_Data> EC_Group_Data::point_hash_to_curve_ro(std::string_view hash_fn,	24✔
309	std::span<const uint8_t> input,
310	std::span<const uint8_t> domain_sep) const {
311	if(m_pcurve) {	24✔
312	auto pt = m_pcurve->hash_to_curve_ro(hash_fn, input, domain_sep);	24✔
313	return std::make_unique<EC_AffinePoint_Data_PC>(shared_from_this(), pt.to_affine());	24✔
314	} else {	24✔
315	throw Not_Implemented("Hash to curve is not implemented for this curve");	×
316	}
317	}
318
319	std::unique_ptr<EC_AffinePoint_Data> EC_Group_Data::point_hash_to_curve_nu(std::string_view hash_fn,	33✔
320	std::span<const uint8_t> input,
321	std::span<const uint8_t> domain_sep) const {
322	if(m_pcurve) {	33✔
323	auto pt = m_pcurve->hash_to_curve_nu(hash_fn, input, domain_sep);	33✔
324	return std::make_unique<EC_AffinePoint_Data_PC>(shared_from_this(), std::move(pt));	30✔
325	} else {	30✔
326	throw Not_Implemented("Hash to curve is not implemented for this curve");	×
327	}
328	}
329
330	std::unique_ptr<EC_AffinePoint_Data> EC_Group_Data::point_g_mul(const EC_Scalar_Data& scalar,	15,363✔
331	RandomNumberGenerator& rng,
332	std::vector<BigInt>& ws) const {
333	if(m_pcurve) {	15,363✔
334	const auto& k = EC_Scalar_Data_PC::checked_ref(scalar);	7,970✔
335	auto pt = m_pcurve->mul_by_g(k.value(), rng).to_affine();	15,940✔
336	return std::make_unique<EC_AffinePoint_Data_PC>(shared_from_this(), std::move(pt));	7,970✔
337	} else {	7,970✔
338	#if defined(BOTAN_HAS_LEGACY_EC_POINT)
339	const auto& group = scalar.group();	7,393✔
340	const auto& bn = EC_Scalar_Data_BN::checked_ref(scalar);	7,393✔
341
342	BOTAN_STATE_CHECK(group->m_base_mult != nullptr);	7,393✔
343	auto pt = group->m_base_mult->mul(bn.value(), rng, m_order, ws);	7,393✔
344	return std::make_unique<EC_AffinePoint_Data_BN>(shared_from_this(), std::move(pt));	7,393✔
345	#else
346	BOTAN_UNUSED(ws);
347	throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
348	#endif
349	}	7,393✔
350	}
351
352	std::unique_ptr<EC_AffinePoint_Data> EC_Group_Data::mul_px_qy(const EC_AffinePoint_Data& p,	3,472✔
353	const EC_Scalar_Data& x,
354	const EC_AffinePoint_Data& q,
355	const EC_Scalar_Data& y,
356	RandomNumberGenerator& rng) const {
357	if(m_pcurve) {	3,472✔
358	auto pt = m_pcurve->mul_px_qy(EC_AffinePoint_Data_PC::checked_ref(p).value(),	5,208✔
359	EC_Scalar_Data_PC::checked_ref(x).value(),	2,604✔
360	EC_AffinePoint_Data_PC::checked_ref(q).value(),	2,604✔
361	EC_Scalar_Data_PC::checked_ref(y).value(),	2,604✔
362	rng);	2,604✔
363
364	if(pt) {	2,604✔
365	return std::make_unique<EC_AffinePoint_Data_PC>(shared_from_this(), pt->to_affine());	2,520✔
366	} else {
367	return nullptr;	84✔
368	}
369	} else {	2,604✔
370	#if defined(BOTAN_HAS_LEGACY_EC_POINT)
371	std::vector<BigInt> ws;	868✔
372	const auto& group = p.group();	868✔
373
374	// TODO this could be better!
375	EC_Point_Var_Point_Precompute p_mul(p.to_legacy_point(), rng, ws);	868✔
376	EC_Point_Var_Point_Precompute q_mul(q.to_legacy_point(), rng, ws);	868✔
377
378	const auto order = group->order() * group->cofactor(); // See #3800	868✔
379
380	auto px = p_mul.mul(EC_Scalar_Data_BN::checked_ref(x).value(), rng, order, ws);	868✔
381	auto qy = q_mul.mul(EC_Scalar_Data_BN::checked_ref(y).value(), rng, order, ws);	868✔
382
383	auto px_qy = px + qy;	868✔
384
385	if(!px_qy.is_zero()) {	1,624✔
386	px_qy.force_affine();	756✔
387	return std::make_unique<EC_AffinePoint_Data_BN>(shared_from_this(), std::move(px_qy));	756✔
388	} else {
389	return nullptr;	112✔
390	}
391	#else
392	throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
393	#endif
394	}	3,472✔
395	}
396
397	std::unique_ptr<EC_AffinePoint_Data> EC_Group_Data::affine_add(const EC_AffinePoint_Data& p,	7,753✔
398	const EC_AffinePoint_Data& q) const {
399	if(m_pcurve) {	7,753✔
400	auto pt = m_pcurve->point_add_mixed(	5,045✔
401	PCurve::PrimeOrderCurve::ProjectivePoint::from_affine(EC_AffinePoint_Data_PC::checked_ref(p).value()),	5,046✔
402	EC_AffinePoint_Data_PC::checked_ref(q).value());	10,090✔
403
404	return std::make_unique<EC_AffinePoint_Data_PC>(shared_from_this(), pt.to_affine());	5,044✔
405	} else {	5,044✔
406	#if defined(BOTAN_HAS_LEGACY_EC_POINT)
407	auto pt = p.to_legacy_point() + q.to_legacy_point();	2,708✔
408	return std::make_unique<EC_AffinePoint_Data_BN>(shared_from_this(), std::move(pt));	2,708✔
409	#else
410	throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
411	#endif
412	}	2,708✔
413	}
414
415	std::unique_ptr<EC_AffinePoint_Data> EC_Group_Data::affine_neg(const EC_AffinePoint_Data& p) const {	9,512✔
416	if(m_pcurve) {	9,512✔
417	auto pt = m_pcurve->point_negate(EC_AffinePoint_Data_PC::checked_ref(p).value());	6,312✔
418	return std::make_unique<EC_AffinePoint_Data_PC>(shared_from_this(), pt);	6,312✔
419	} else {	6,312✔
420	#if defined(BOTAN_HAS_LEGACY_EC_POINT)
421	auto pt = p.to_legacy_point();	3,200✔
422	pt.negate(); // negates in place	3,200✔
423	return std::make_unique<EC_AffinePoint_Data_BN>(shared_from_this(), std::move(pt));	3,200✔
424	#else
425	throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
426	#endif
427	}	3,200✔
428	}
429
430	std::unique_ptr<EC_Mul2Table_Data> EC_Group_Data::make_mul2_table(const EC_AffinePoint_Data& h) const {	13,257✔
431	if(m_pcurve) {	13,257✔
432	return std::make_unique<EC_Mul2Table_Data_PC>(h);	11,176✔
433	} else {
434	#if defined(BOTAN_HAS_LEGACY_EC_POINT)
435	EC_AffinePoint_Data_BN g(shared_from_this(), this->base_point());	4,162✔
436	return std::make_unique<EC_Mul2Table_Data_BN>(g, h);	2,081✔
437	#else
438	throw Not_Implemented("Legacy EC interfaces disabled in this build configuration");
439	#endif
440	}	2,081✔
441	}
442
443	} // namespace Botan

randombit / botan / 13128051110

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