5079590438

Committed 25 May 2023 12:28PM UTC coverage: 92.228% (+0.5%) from 91.723%

Build # 5079590438

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Pull #3502

github

Pull Request Pull Request #3502: Apply clang-format to the codebase

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/src/lib/pubkey/mce/mceliece_key.cpp

/*
 * (C) Copyright Projet SECRET, INRIA, Rocquencourt
 * (C) Bhaskar Biswas and  Nicolas Sendrier
 *
 * (C) 2014 cryptosource GmbH
 * (C) 2014 Falko Strenzke fstrenzke@cryptosource.de
 * (C) 2015 Jack Lloyd
 *
 * Botan is released under the Simplified BSD License (see license.txt)
 *
 */

#include <botan/mceliece.h>

#include <botan/ber_dec.h>
#include <botan/der_enc.h>
#include <botan/rng.h>
#include <botan/internal/bit_ops.h>
#include <botan/internal/code_based_util.h>
#include <botan/internal/loadstor.h>
#include <botan/internal/mce_internal.h>
#include <botan/internal/pk_ops_impl.h>
#include <botan/internal/polyn_gf2m.h>

namespace Botan {

McEliece_PrivateKey::McEliece_PrivateKey(const McEliece_PrivateKey&) = default;
McEliece_PrivateKey::McEliece_PrivateKey(McEliece_PrivateKey&&) noexcept = default;
McEliece_PrivateKey& McEliece_PrivateKey::operator=(const McEliece_PrivateKey&) = default;
McEliece_PrivateKey& McEliece_PrivateKey::operator=(McEliece_PrivateKey&&) noexcept = default;
McEliece_PrivateKey::~McEliece_PrivateKey() = default;

McEliece_PrivateKey::McEliece_PrivateKey(const polyn_gf2m& goppa_polyn,
                                         const std::vector<uint32_t>& parity_check_matrix_coeffs,
                                         const std::vector<polyn_gf2m>& square_root_matrix,
                                         const std::vector<gf2m>& inverse_support,
                                         const std::vector<uint8_t>& public_matrix) :
      McEliece_PublicKey(public_matrix, goppa_polyn.get_degree(), inverse_support.size()),
      m_g{goppa_polyn},
      m_sqrtmod(square_root_matrix),
      m_Linv(inverse_support),
      m_coeffs(parity_check_matrix_coeffs),
      m_codimension(static_cast<size_t>(ceil_log2(inverse_support.size())) * goppa_polyn.get_degree()),
      m_dimension(inverse_support.size() - m_codimension) {}

McEliece_PrivateKey::McEliece_PrivateKey(RandomNumberGenerator& rng, size_t code_length, size_t t) {
   uint32_t ext_deg = ceil_log2(code_length);
   *this = generate_mceliece_key(rng, ext_deg, code_length, t);
}

const polyn_gf2m& McEliece_PrivateKey::get_goppa_polyn() const { return m_g[0]; }

size_t McEliece_PublicKey::get_message_word_bit_length() const {
   size_t codimension = ceil_log2(m_code_length) * m_t;
   return m_code_length - codimension;
}

secure_vector<uint8_t> McEliece_PublicKey::random_plaintext_element(RandomNumberGenerator& rng) const {
   const size_t bits = get_message_word_bit_length();

   secure_vector<uint8_t> plaintext((bits + 7) / 8);
   rng.randomize(plaintext.data(), plaintext.size());

   // unset unused bits in the last plaintext byte
   if(uint32_t used = bits % 8) {
      const uint8_t mask = (1 << used) - 1;
      plaintext[plaintext.size() - 1] &= mask;
   }

   return plaintext;
}

AlgorithmIdentifier McEliece_PublicKey::algorithm_identifier() const {
   return AlgorithmIdentifier(object_identifier(), AlgorithmIdentifier::USE_EMPTY_PARAM);
}

std::vector<uint8_t> McEliece_PublicKey::public_key_bits() const {
   std::vector<uint8_t> output;
   DER_Encoder(output)
      .start_sequence()
      .start_sequence()
      .encode(static_cast<size_t>(get_code_length()))
      .encode(static_cast<size_t>(get_t()))
      .end_cons()
      .encode(m_public_matrix, ASN1_Type::OctetString)
      .end_cons();
   return output;
}

size_t McEliece_PublicKey::key_length() const { return m_code_length; }

size_t McEliece_PublicKey::estimated_strength() const { return mceliece_work_factor(m_code_length, m_t); }

McEliece_PublicKey::McEliece_PublicKey(std::span<const uint8_t> key_bits) {
   BER_Decoder dec(key_bits);
   size_t n;
   size_t t;
   dec.start_sequence()
      .start_sequence()
      .decode(n)
      .decode(t)
      .end_cons()
      .decode(m_public_matrix, ASN1_Type::OctetString)
      .end_cons();
   m_t = t;
   m_code_length = n;
}

secure_vector<uint8_t> McEliece_PrivateKey::private_key_bits() const {
   DER_Encoder enc;
   enc.start_sequence()
      .start_sequence()
      .encode(static_cast<size_t>(get_code_length()))
      .encode(static_cast<size_t>(get_t()))
      .end_cons()
      .encode(m_public_matrix, ASN1_Type::OctetString)
      .encode(m_g[0].encode(), ASN1_Type::OctetString);  // g as octet string
   enc.start_sequence();
   for(size_t i = 0; i < m_sqrtmod.size(); i++) {
      enc.encode(m_sqrtmod[i].encode(), ASN1_Type::OctetString);
   }
   enc.end_cons();
   secure_vector<uint8_t> enc_support;

   for(uint16_t Linv : m_Linv) {
      enc_support.push_back(get_byte<0>(Linv));
      enc_support.push_back(get_byte<1>(Linv));
   }
   enc.encode(enc_support, ASN1_Type::OctetString);
   secure_vector<uint8_t> enc_H;
   for(uint32_t coef : m_coeffs) {
      enc_H.push_back(get_byte<0>(coef));
      enc_H.push_back(get_byte<1>(coef));
      enc_H.push_back(get_byte<2>(coef));
      enc_H.push_back(get_byte<3>(coef));
   }
   enc.encode(enc_H, ASN1_Type::OctetString);
   enc.end_cons();
   return enc.get_contents();
}

bool McEliece_PrivateKey::check_key(RandomNumberGenerator& rng, bool /*unused*/) const {
   const secure_vector<uint8_t> plaintext = this->random_plaintext_element(rng);

   secure_vector<uint8_t> ciphertext;
   secure_vector<uint8_t> errors;
   mceliece_encrypt(ciphertext, errors, plaintext, *this, rng);

   secure_vector<uint8_t> plaintext_out;
   secure_vector<uint8_t> errors_out;
   mceliece_decrypt(plaintext_out, errors_out, ciphertext, *this);

   if(errors != errors_out || plaintext != plaintext_out)
      return false;

   return true;
}

McEliece_PrivateKey::McEliece_PrivateKey(std::span<const uint8_t> key_bits) {
   size_t n, t;
   secure_vector<uint8_t> enc_g;
   BER_Decoder dec_base(key_bits);
   BER_Decoder dec = dec_base.start_sequence()
                        .start_sequence()
                        .decode(n)
                        .decode(t)
                        .end_cons()
                        .decode(m_public_matrix, ASN1_Type::OctetString)
                        .decode(enc_g, ASN1_Type::OctetString);

   if(t == 0 || n == 0)
      throw Decoding_Error("invalid McEliece parameters");

   uint32_t ext_deg = ceil_log2(n);
   m_code_length = n;
   m_t = t;
   m_codimension = (ext_deg * t);
   m_dimension = (n - m_codimension);

   auto sp_field = std::make_shared<GF2m_Field>(ext_deg);
   m_g = {polyn_gf2m(enc_g, sp_field)};
   if(m_g[0].get_degree() != static_cast<int>(t)) {
      throw Decoding_Error("degree of decoded Goppa polynomial is incorrect");
   }
   BER_Decoder dec2 = dec.start_sequence();
   for(uint32_t i = 0; i < t / 2; i++) {
      secure_vector<uint8_t> sqrt_enc;
      dec2.decode(sqrt_enc, ASN1_Type::OctetString);
      while(sqrt_enc.size() < (t * 2)) {
         // ensure that the length is always t
         sqrt_enc.push_back(0);
         sqrt_enc.push_back(0);
      }
      if(sqrt_enc.size() != t * 2) {
         throw Decoding_Error("length of square root polynomial entry is too large");
      }
      m_sqrtmod.push_back(polyn_gf2m(sqrt_enc, sp_field));
   }
   secure_vector<uint8_t> enc_support;
   BER_Decoder dec3 = dec2.end_cons().decode(enc_support, ASN1_Type::OctetString);
   if(enc_support.size() % 2) {
      throw Decoding_Error("encoded support has odd length");
   }
   if(enc_support.size() / 2 != n) {
      throw Decoding_Error("encoded support has length different from code length");
   }
   for(uint32_t i = 0; i < n * 2; i += 2) {
      gf2m el = (enc_support[i] << 8) | enc_support[i + 1];
      m_Linv.push_back(el);
   }
   secure_vector<uint8_t> enc_H;
   dec3.decode(enc_H, ASN1_Type::OctetString).end_cons();
   if(enc_H.size() % 4) {
      throw Decoding_Error("encoded parity check matrix has length which is not a multiple of four");
   }
   if(enc_H.size() / 4 != bit_size_to_32bit_size(m_codimension) * m_code_length) {
      throw Decoding_Error("encoded parity check matrix has wrong length");
   }

   for(uint32_t i = 0; i < enc_H.size(); i += 4) {
      uint32_t coeff = (enc_H[i] << 24) | (enc_H[i + 1] << 16) | (enc_H[i + 2] << 8) | enc_H[i + 3];
      m_coeffs.push_back(coeff);
   }
}

bool McEliece_PrivateKey::operator==(const McEliece_PrivateKey& other) const {
   if(*static_cast<const McEliece_PublicKey*>(this) != *static_cast<const McEliece_PublicKey*>(&other)) {
      return false;
   }
   if(m_g != other.m_g) {
      return false;
   }

   if(m_sqrtmod != other.m_sqrtmod) {
      return false;
   }
   if(m_Linv != other.m_Linv) {
      return false;
   }
   if(m_coeffs != other.m_coeffs) {
      return false;
   }

   if(m_codimension != other.m_codimension || m_dimension != other.m_dimension) {
      return false;
   }

   return true;
}

std::unique_ptr<Public_Key> McEliece_PrivateKey::public_key() const {
   return std::make_unique<McEliece_PublicKey>(get_public_matrix(), get_t(), get_code_length());
}

bool McEliece_PublicKey::operator==(const McEliece_PublicKey& other) const {
   if(m_public_matrix != other.m_public_matrix) {
      return false;
   }
   if(m_t != other.m_t) {
      return false;
   }
   if(m_code_length != other.m_code_length) {
      return false;
   }
   return true;
}

namespace {

class MCE_KEM_Encryptor final : public PK_Ops::KEM_Encryption_with_KDF {
   public:
      MCE_KEM_Encryptor(const McEliece_PublicKey& key, std::string_view kdf) :
            KEM_Encryption_with_KDF(kdf), m_key(key) {}

   private:
      size_t raw_kem_shared_key_length() const override {
         const size_t err_sz = (m_key.get_code_length() + 7) / 8;
         const size_t ptext_sz = (m_key.get_message_word_bit_length() + 7) / 8;
         return ptext_sz + err_sz;
      }

      size_t encapsulated_key_length() const override { return (m_key.get_code_length() + 7) / 8; }

      void raw_kem_encrypt(secure_vector<uint8_t>& out_encapsulated_key,
                           secure_vector<uint8_t>& raw_shared_key,
                           RandomNumberGenerator& rng) override {
         secure_vector<uint8_t> plaintext = m_key.random_plaintext_element(rng);

         secure_vector<uint8_t> ciphertext, error_mask;
         mceliece_encrypt(ciphertext, error_mask, plaintext, m_key, rng);

         raw_shared_key.clear();
         raw_shared_key += plaintext;
         raw_shared_key += error_mask;

         out_encapsulated_key.swap(ciphertext);
      }

      const McEliece_PublicKey& m_key;
};

class MCE_KEM_Decryptor final : public PK_Ops::KEM_Decryption_with_KDF {
   public:
      MCE_KEM_Decryptor(const McEliece_PrivateKey& key, std::string_view kdf) :
            KEM_Decryption_with_KDF(kdf), m_key(key) {}

   private:
      size_t raw_kem_shared_key_length() const override {
         const size_t err_sz = (m_key.get_code_length() + 7) / 8;
         const size_t ptext_sz = (m_key.get_message_word_bit_length() + 7) / 8;
         return ptext_sz + err_sz;
      }

      secure_vector<uint8_t> raw_kem_decrypt(const uint8_t encap_key[], size_t len) override {
         secure_vector<uint8_t> plaintext, error_mask;
         mceliece_decrypt(plaintext, error_mask, encap_key, len, m_key);

         secure_vector<uint8_t> output;
         output.reserve(plaintext.size() + error_mask.size());
         output.insert(output.end(), plaintext.begin(), plaintext.end());
         output.insert(output.end(), error_mask.begin(), error_mask.end());
         return output;
      }

      const McEliece_PrivateKey& m_key;
};

}

std::unique_ptr<PK_Ops::KEM_Encryption> McEliece_PublicKey::create_kem_encryption_op(std::string_view params,
                                                                                     std::string_view provider) const {
   if(provider == "base" || provider.empty())
      return std::make_unique<MCE_KEM_Encryptor>(*this, params);
   throw Provider_Not_Found(algo_name(), provider);
}

std::unique_ptr<PK_Ops::KEM_Decryption> McEliece_PrivateKey::create_kem_decryption_op(RandomNumberGenerator& /*rng*/,
                                                                                      std::string_view params,
                                                                                      std::string_view provider) const {
   if(provider == "base" || provider.empty())
      return std::make_unique<MCE_KEM_Decryptor>(*this, params);
   throw Provider_Not_Found(algo_name(), provider);
}

}

1	/*
2	* (C) Copyright Projet SECRET, INRIA, Rocquencourt
3	* (C) Bhaskar Biswas and Nicolas Sendrier
4	*
5	* (C) 2014 cryptosource GmbH
6	* (C) 2014 Falko Strenzke fstrenzke@cryptosource.de
7	* (C) 2015 Jack Lloyd
8	*
9	* Botan is released under the Simplified BSD License (see license.txt)
10	*
11	*/
12
13	#include <botan/mceliece.h>
14
15	#include <botan/ber_dec.h>
16	#include <botan/der_enc.h>
17	#include <botan/rng.h>
18	#include <botan/internal/bit_ops.h>
19	#include <botan/internal/code_based_util.h>
20	#include <botan/internal/loadstor.h>
21	#include <botan/internal/mce_internal.h>
22	#include <botan/internal/pk_ops_impl.h>
23	#include <botan/internal/polyn_gf2m.h>
24
25	namespace Botan {
26
27	McEliece_PrivateKey::McEliece_PrivateKey(const McEliece_PrivateKey&) = default;	×
28	McEliece_PrivateKey::McEliece_PrivateKey(McEliece_PrivateKey&&) noexcept = default;	×
29	McEliece_PrivateKey& McEliece_PrivateKey::operator=(const McEliece_PrivateKey&) = default;	×
30	McEliece_PrivateKey& McEliece_PrivateKey::operator=(McEliece_PrivateKey&&) noexcept = default;	98✔
31	McEliece_PrivateKey::~McEliece_PrivateKey() = default;	670✔
32
33	McEliece_PrivateKey::McEliece_PrivateKey(const polyn_gf2m& goppa_polyn,	98✔
34	const std::vector<uint32_t>& parity_check_matrix_coeffs,
35	const std::vector<polyn_gf2m>& square_root_matrix,
36	const std::vector<gf2m>& inverse_support,
37	const std::vector<uint8_t>& public_matrix) :	98✔
38	McEliece_PublicKey(public_matrix, goppa_polyn.get_degree(), inverse_support.size()),	98✔
39	m_g{goppa_polyn},	196✔
40	m_sqrtmod(square_root_matrix),	98✔
41	m_Linv(inverse_support),	98✔
42	m_coeffs(parity_check_matrix_coeffs),	98✔
43	m_codimension(static_cast<size_t>(ceil_log2(inverse_support.size())) * goppa_polyn.get_degree()),	196✔
44	m_dimension(inverse_support.size() - m_codimension) {}	196✔
45
46	McEliece_PrivateKey::McEliece_PrivateKey(RandomNumberGenerator& rng, size_t code_length, size_t t) {	98✔
47	uint32_t ext_deg = ceil_log2(code_length);	98✔
48	*this = generate_mceliece_key(rng, ext_deg, code_length, t);	98✔
49	}	98✔
50
51	const polyn_gf2m& McEliece_PrivateKey::get_goppa_polyn() const { return m_g[0]; }	10,584✔
52
53	size_t McEliece_PublicKey::get_message_word_bit_length() const {	10,414✔
54	size_t codimension = ceil_log2(m_code_length) * m_t;	10,414✔
55	return m_code_length - codimension;	10,414✔
56	}
57
58	secure_vector<uint8_t> McEliece_PublicKey::random_plaintext_element(RandomNumberGenerator& rng) const {	2,646✔
59	const size_t bits = get_message_word_bit_length();	2,646✔
60
61	secure_vector<uint8_t> plaintext((bits + 7) / 8);	2,646✔
62	rng.randomize(plaintext.data(), plaintext.size());	2,646✔
63
64	// unset unused bits in the last plaintext byte
65	if(uint32_t used = bits % 8) {	2,646✔
66	const uint8_t mask = (1 << used) - 1;	1,933✔
67	plaintext[plaintext.size() - 1] &= mask;	1,933✔
68	}
69
70	return plaintext;	2,646✔
71	}	×
72
73	AlgorithmIdentifier McEliece_PublicKey::algorithm_identifier() const {	13✔
74	return AlgorithmIdentifier(object_identifier(), AlgorithmIdentifier::USE_EMPTY_PARAM);	13✔
75	}
76
77	std::vector<uint8_t> McEliece_PublicKey::public_key_bits() const {	267✔
78	std::vector<uint8_t> output;	267✔
79	DER_Encoder(output)	534✔
80	.start_sequence()	267✔
81	.start_sequence()	267✔
82	.encode(static_cast<size_t>(get_code_length()))	267✔
83	.encode(static_cast<size_t>(get_t()))	267✔
84	.end_cons()	267✔
85	.encode(m_public_matrix, ASN1_Type::OctetString)	267✔
86	.end_cons();	267✔
87	return output;	267✔
88	}	×
89
90	size_t McEliece_PublicKey::key_length() const { return m_code_length; }	×
91
92	size_t McEliece_PublicKey::estimated_strength() const { return mceliece_work_factor(m_code_length, m_t); }	2✔
93
94	McEliece_PublicKey::McEliece_PublicKey(std::span<const uint8_t> key_bits) {	86✔
95	BER_Decoder dec(key_bits);	86✔
96	size_t n;	86✔
97	size_t t;	86✔
98	dec.start_sequence()	86✔
99	.start_sequence()	172✔
100	.decode(n)	86✔
101	.decode(t)	86✔
102	.end_cons()	86✔
103	.decode(m_public_matrix, ASN1_Type::OctetString)	86✔
104	.end_cons();	86✔
105	m_t = t;	86✔
106	m_code_length = n;	86✔
107	}	86✔
108
109	secure_vector<uint8_t> McEliece_PrivateKey::private_key_bits() const {	270✔
110	DER_Encoder enc;	270✔
111	enc.start_sequence()	270✔
112	.start_sequence()	270✔
113	.encode(static_cast<size_t>(get_code_length()))	270✔
114	.encode(static_cast<size_t>(get_t()))	270✔
115	.end_cons()	270✔
116	.encode(m_public_matrix, ASN1_Type::OctetString)	270✔
117	.encode(m_g[0].encode(), ASN1_Type::OctetString); // g as octet string	540✔
118	enc.start_sequence();	270✔
119	for(size_t i = 0; i < m_sqrtmod.size(); i++) {	4,544✔
120	enc.encode(m_sqrtmod[i].encode(), ASN1_Type::OctetString);	12,822✔
121	}
122	enc.end_cons();	270✔
123	secure_vector<uint8_t> enc_support;	270✔
124
125	for(uint16_t Linv : m_Linv) {	387,758✔
126	enc_support.push_back(get_byte<0>(Linv));	387,488✔
127	enc_support.push_back(get_byte<1>(Linv));	387,488✔
128	}
129	enc.encode(enc_support, ASN1_Type::OctetString);	270✔
130	secure_vector<uint8_t> enc_H;	270✔
131	for(uint32_t coef : m_coeffs) {	8,999,790✔
132	enc_H.push_back(get_byte<0>(coef));	8,999,520✔
133	enc_H.push_back(get_byte<1>(coef));	8,999,520✔
134	enc_H.push_back(get_byte<2>(coef));	8,999,520✔
135	enc_H.push_back(get_byte<3>(coef));	8,999,520✔
136	}
137	enc.encode(enc_H, ASN1_Type::OctetString);	270✔
138	enc.end_cons();	270✔
139	return enc.get_contents();	540✔
140	}	540✔
141
142	bool McEliece_PrivateKey::check_key(RandomNumberGenerator& rng, bool /unused/) const {	85✔
143	const secure_vector<uint8_t> plaintext = this->random_plaintext_element(rng);	85✔
144
145	secure_vector<uint8_t> ciphertext;	85✔
146	secure_vector<uint8_t> errors;	85✔
147	mceliece_encrypt(ciphertext, errors, plaintext, *this, rng);	85✔
148
149	secure_vector<uint8_t> plaintext_out;	85✔
150	secure_vector<uint8_t> errors_out;	85✔
151	mceliece_decrypt(plaintext_out, errors_out, ciphertext, *this);	85✔
152
153	if(errors != errors_out \|\| plaintext != plaintext_out)	85✔
154	return false;	×
155
156	return true;
157	}	425✔
158
159	McEliece_PrivateKey::McEliece_PrivateKey(std::span<const uint8_t> key_bits) {	89✔
160	size_t n, t;	89✔
161	secure_vector<uint8_t> enc_g;	89✔
162	BER_Decoder dec_base(key_bits);	89✔
163	BER_Decoder dec = dec_base.start_sequence()	89✔
164	.start_sequence()	178✔
165	.decode(n)	89✔
166	.decode(t)	89✔
167	.end_cons()	89✔
168	.decode(m_public_matrix, ASN1_Type::OctetString)	89✔
169	.decode(enc_g, ASN1_Type::OctetString);	89✔
170
171	if(t == 0 \|\| n == 0)	89✔
172	throw Decoding_Error("invalid McEliece parameters");	×
173
174	uint32_t ext_deg = ceil_log2(n);	89✔
175	m_code_length = n;	89✔
176	m_t = t;	89✔
177	m_codimension = (ext_deg * t);	89✔
178	m_dimension = (n - m_codimension);	89✔
179
180	auto sp_field = std::make_shared<GF2m_Field>(ext_deg);	89✔
181	m_g = {polyn_gf2m(enc_g, sp_field)};	267✔
182	if(m_g[0].get_degree() != static_cast<int>(t)) {	89✔
183	throw Decoding_Error("degree of decoded Goppa polynomial is incorrect");	×
184	}
185	BER_Decoder dec2 = dec.start_sequence();	89✔
186	for(uint32_t i = 0; i < t / 2; i++) {	1,471✔
187	secure_vector<uint8_t> sqrt_enc;	1,382✔
188	dec2.decode(sqrt_enc, ASN1_Type::OctetString);	1,382✔
189	while(sqrt_enc.size() < (t * 2)) {	1,385✔
190	// ensure that the length is always t
191	sqrt_enc.push_back(0);	3✔
192	sqrt_enc.push_back(0);	3✔
193	}
194	if(sqrt_enc.size() != t * 2) {	1,382✔
195	throw Decoding_Error("length of square root polynomial entry is too large");	×
196	}
197	m_sqrtmod.push_back(polyn_gf2m(sqrt_enc, sp_field));	2,764✔
198	}	1,382✔
199	secure_vector<uint8_t> enc_support;	89✔
200	BER_Decoder dec3 = dec2.end_cons().decode(enc_support, ASN1_Type::OctetString);	89✔
201	if(enc_support.size() % 2) {	89✔
202	throw Decoding_Error("encoded support has odd length");	×
203	}
204	if(enc_support.size() / 2 != n) {	89✔
205	throw Decoding_Error("encoded support has length different from code length");	×
206	}
207	for(uint32_t i = 0; i < n * 2; i += 2) {	124,057✔
208	gf2m el = (enc_support[i] << 8) \| enc_support[i + 1];	123,968✔
209	m_Linv.push_back(el);	123,968✔
210	}
211	secure_vector<uint8_t> enc_H;	89✔
212	dec3.decode(enc_H, ASN1_Type::OctetString).end_cons();	89✔
213	if(enc_H.size() % 4) {	89✔
214	throw Decoding_Error("encoded parity check matrix has length which is not a multiple of four");	×
215	}
216	if(enc_H.size() / 4 != bit_size_to_32bit_size(m_codimension) * m_code_length) {	89✔
217	throw Decoding_Error("encoded parity check matrix has wrong length");	×
218	}
219
220	for(uint32_t i = 0; i < enc_H.size(); i += 4) {	2,801,081✔
221	uint32_t coeff = (enc_H[i] << 24) \| (enc_H[i + 1] << 16) \| (enc_H[i + 2] << 8) \| enc_H[i + 3];	2,800,992✔
222	m_coeffs.push_back(coeff);	2,800,992✔
223	}
224	}	356✔
225
226	bool McEliece_PrivateKey::operator==(const McEliece_PrivateKey& other) const {	×
227	if(static_cast<const McEliece_PublicKey>(this) != static_cast<const McEliece_PublicKey>(&other)) {	×
228	return false;
229	}
230	if(m_g != other.m_g) {	×
231	return false;
232	}
233
234	if(m_sqrtmod != other.m_sqrtmod) {	×
235	return false;
236	}
237	if(m_Linv != other.m_Linv) {	×
238	return false;
239	}
240	if(m_coeffs != other.m_coeffs) {	×
241	return false;
242	}
243
244	if(m_codimension != other.m_codimension \|\| m_dimension != other.m_dimension) {	×
245	return false;	×
246	}
247
248	return true;
249	}
250
251	std::unique_ptr<Public_Key> McEliece_PrivateKey::public_key() const {	2✔
252	return std::make_unique<McEliece_PublicKey>(get_public_matrix(), get_t(), get_code_length());	2✔
253	}
254
255	bool McEliece_PublicKey::operator==(const McEliece_PublicKey& other) const {	×
256	if(m_public_matrix != other.m_public_matrix) {	×
257	return false;
258	}
259	if(m_t != other.m_t) {	×
260	return false;
261	}
262	if(m_code_length != other.m_code_length) {	×
263	return false;	×
264	}
265	return true;
266	}
267
268	namespace {
269
270	class MCE_KEM_Encryptor final : public PK_Ops::KEM_Encryption_with_KDF {
271	public:
272	MCE_KEM_Encryptor(const McEliece_PublicKey& key, std::string_view kdf) :	96✔
273	KEM_Encryption_with_KDF(kdf), m_key(key) {}	96✔
274
275	private:
276	size_t raw_kem_shared_key_length() const override {	2,561✔
277	const size_t err_sz = (m_key.get_code_length() + 7) / 8;	2,561✔
278	const size_t ptext_sz = (m_key.get_message_word_bit_length() + 7) / 8;	2,561✔
279	return ptext_sz + err_sz;	2,561✔
280	}
281
282	size_t encapsulated_key_length() const override { return (m_key.get_code_length() + 7) / 8; }	2,561✔
283
284	void raw_kem_encrypt(secure_vector<uint8_t>& out_encapsulated_key,	2,561✔
285	secure_vector<uint8_t>& raw_shared_key,
286	RandomNumberGenerator& rng) override {
287	secure_vector<uint8_t> plaintext = m_key.random_plaintext_element(rng);	2,561✔
288
289	secure_vector<uint8_t> ciphertext, error_mask;	2,561✔
290	mceliece_encrypt(ciphertext, error_mask, plaintext, m_key, rng);	2,561✔
291
292	raw_shared_key.clear();	2,561✔
293	raw_shared_key += plaintext;	2,561✔
294	raw_shared_key += error_mask;	2,561✔
295
296	out_encapsulated_key.swap(ciphertext);	2,561✔
297	}	5,122✔
298
299	const McEliece_PublicKey& m_key;
300	};
301
302	class MCE_KEM_Decryptor final : public PK_Ops::KEM_Decryption_with_KDF {
303	public:
304	MCE_KEM_Decryptor(const McEliece_PrivateKey& key, std::string_view kdf) :	96✔
305	KEM_Decryption_with_KDF(kdf), m_key(key) {}	96✔
306
307	private:
308	size_t raw_kem_shared_key_length() const override {	2,561✔
309	const size_t err_sz = (m_key.get_code_length() + 7) / 8;	2,561✔
310	const size_t ptext_sz = (m_key.get_message_word_bit_length() + 7) / 8;	2,561✔
311	return ptext_sz + err_sz;	2,561✔
312	}
313
314	secure_vector<uint8_t> raw_kem_decrypt(const uint8_t encap_key[], size_t len) override {	2,561✔
315	secure_vector<uint8_t> plaintext, error_mask;	2,561✔
316	mceliece_decrypt(plaintext, error_mask, encap_key, len, m_key);	2,561✔
317
318	secure_vector<uint8_t> output;	2,561✔
319	output.reserve(plaintext.size() + error_mask.size());	2,561✔
320	output.insert(output.end(), plaintext.begin(), plaintext.end());	2,561✔
321	output.insert(output.end(), error_mask.begin(), error_mask.end());	2,561✔
322	return output;	2,561✔
323	}	5,122✔
324
325	const McEliece_PrivateKey& m_key;
326	};
327
328	}
329
330	std::unique_ptr<PK_Ops::KEM_Encryption> McEliece_PublicKey::create_kem_encryption_op(std::string_view params,	96✔
331	std::string_view provider) const {
332	if(provider == "base" \|\| provider.empty())	96✔
333	return std::make_unique<MCE_KEM_Encryptor>(*this, params);	96✔
334	throw Provider_Not_Found(algo_name(), provider);	×
335	}
336
337	std::unique_ptr<PK_Ops::KEM_Decryption> McEliece_PrivateKey::create_kem_decryption_op(RandomNumberGenerator& /rng/,	96✔
338	std::string_view params,
339	std::string_view provider) const {
340	if(provider == "base" \|\| provider.empty())	96✔
341	return std::make_unique<MCE_KEM_Decryptor>(*this, params);	96✔
342	throw Provider_Not_Found(algo_name(), provider);	×
343	}
344
345	}

randombit / botan / 5079590438

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