diff options
Diffstat (limited to 'src/libs/3rdparty/botan/src/lib/pubkey/dsa/dsa.cpp')
| -rw-r--r-- | src/libs/3rdparty/botan/src/lib/pubkey/dsa/dsa.cpp | 219 |
1 files changed, 0 insertions, 219 deletions
diff --git a/src/libs/3rdparty/botan/src/lib/pubkey/dsa/dsa.cpp b/src/libs/3rdparty/botan/src/lib/pubkey/dsa/dsa.cpp deleted file mode 100644 index 4122701730..0000000000 --- a/src/libs/3rdparty/botan/src/lib/pubkey/dsa/dsa.cpp +++ /dev/null @@ -1,219 +0,0 @@ -/* -* DSA -* (C) 1999-2010,2014,2016 Jack Lloyd -* (C) 2016 René Korthaus -* -* Botan is released under the Simplified BSD License (see license.txt) -*/ - -#include <botan/dsa.h> -#include <botan/keypair.h> -#include <botan/reducer.h> -#include <botan/rng.h> -#include <botan/internal/pk_ops_impl.h> - -#if defined(BOTAN_HAS_RFC6979_GENERATOR) - #include <botan/emsa.h> - #include <botan/rfc6979.h> -#endif - -namespace Botan { - -/* -* DSA_PublicKey Constructor -*/ -DSA_PublicKey::DSA_PublicKey(const DL_Group& grp, const BigInt& y1) - { - m_group = grp; - m_y = y1; - } - -/* -* Create a DSA private key -*/ -DSA_PrivateKey::DSA_PrivateKey(RandomNumberGenerator& rng, - const DL_Group& grp, - const BigInt& x_arg) - { - m_group = grp; - - if(x_arg == 0) - m_x = BigInt::random_integer(rng, 2, group_q()); - else - m_x = x_arg; - - m_y = m_group.power_g_p(m_x, m_group.q_bits()); - } - -DSA_PrivateKey::DSA_PrivateKey(const AlgorithmIdentifier& alg_id, - const secure_vector<uint8_t>& key_bits) : - DL_Scheme_PrivateKey(alg_id, key_bits, DL_Group::ANSI_X9_57) - { - m_y = m_group.power_g_p(m_x, m_group.q_bits()); - } - -/* -* Check Private DSA Parameters -*/ -bool DSA_PrivateKey::check_key(RandomNumberGenerator& rng, bool strong) const - { - if(!DL_Scheme_PrivateKey::check_key(rng, strong) || m_x >= group_q()) - return false; - - if(!strong) - return true; - - return KeyPair::signature_consistency_check(rng, *this, "EMSA1(SHA-256)"); - } - -namespace { - -/** -* Object that can create a DSA signature -*/ -class DSA_Signature_Operation final : public PK_Ops::Signature_with_EMSA - { - public: - DSA_Signature_Operation(const DSA_PrivateKey& dsa, - const std::string& emsa, - RandomNumberGenerator& rng) : - PK_Ops::Signature_with_EMSA(emsa), - m_group(dsa.get_group()), - m_x(dsa.get_x()) - { -#if defined(BOTAN_HAS_RFC6979_GENERATOR) - m_rfc6979_hash = hash_for_emsa(emsa); -#endif - - m_b = BigInt::random_integer(rng, 2, dsa.group_q()); - m_b_inv = m_group.inverse_mod_q(m_b); - } - - size_t signature_length() const override { return 2*m_group.q_bytes(); } - size_t max_input_bits() const override { return m_group.q_bits(); } - - secure_vector<uint8_t> raw_sign(const uint8_t msg[], size_t msg_len, - RandomNumberGenerator& rng) override; - private: - const DL_Group m_group; - const BigInt& m_x; -#if defined(BOTAN_HAS_RFC6979_GENERATOR) - std::string m_rfc6979_hash; -#endif - - BigInt m_b, m_b_inv; - }; - -secure_vector<uint8_t> -DSA_Signature_Operation::raw_sign(const uint8_t msg[], size_t msg_len, - RandomNumberGenerator& rng) - { - const BigInt& q = m_group.get_q(); - - BigInt m(msg, msg_len, m_group.q_bits()); - - while(m >= q) - m -= q; - -#if defined(BOTAN_HAS_RFC6979_GENERATOR) - BOTAN_UNUSED(rng); - const BigInt k = generate_rfc6979_nonce(m_x, q, m, m_rfc6979_hash); -#else - const BigInt k = BigInt::random_integer(rng, 1, q); -#endif - - const BigInt k_inv = m_group.inverse_mod_q(k); - - const BigInt r = m_group.mod_q(m_group.power_g_p(k, m_group.q_bits())); - - /* - * Blind the input message and compute x*r+m as (x*r*b + m*b)/b - */ - m_b = m_group.square_mod_q(m_b); - m_b_inv = m_group.square_mod_q(m_b_inv); - - m = m_group.multiply_mod_q(m_b, m); - const BigInt xr = m_group.multiply_mod_q(m_b, m_x, r); - - const BigInt s = m_group.multiply_mod_q(m_b_inv, k_inv, m_group.mod_q(xr+m)); - - // With overwhelming probability, a bug rather than actual zero r/s - if(r.is_zero() || s.is_zero()) - throw Internal_Error("Computed zero r/s during DSA signature"); - - return BigInt::encode_fixed_length_int_pair(r, s, q.bytes()); - } - -/** -* Object that can verify a DSA signature -*/ -class DSA_Verification_Operation final : public PK_Ops::Verification_with_EMSA - { - public: - DSA_Verification_Operation(const DSA_PublicKey& dsa, - const std::string& emsa) : - PK_Ops::Verification_with_EMSA(emsa), - m_group(dsa.get_group()), - m_y(dsa.get_y()) - { - } - - size_t max_input_bits() const override { return m_group.q_bits(); } - - bool with_recovery() const override { return false; } - - bool verify(const uint8_t msg[], size_t msg_len, - const uint8_t sig[], size_t sig_len) override; - private: - const DL_Group m_group; - const BigInt& m_y; - }; - -bool DSA_Verification_Operation::verify(const uint8_t msg[], size_t msg_len, - const uint8_t sig[], size_t sig_len) - { - const BigInt& q = m_group.get_q(); - const size_t q_bytes = q.bytes(); - - if(sig_len != 2*q_bytes || msg_len > q_bytes) - return false; - - BigInt r(sig, q_bytes); - BigInt s(sig + q_bytes, q_bytes); - BigInt i(msg, msg_len, q.bits()); - - if(r <= 0 || r >= q || s <= 0 || s >= q) - return false; - - s = inverse_mod(s, q); - - const BigInt sr = m_group.multiply_mod_q(s, r); - const BigInt si = m_group.multiply_mod_q(s, i); - - s = m_group.multi_exponentiate(si, m_y, sr); - - return (m_group.mod_q(s) == r); - } - -} - -std::unique_ptr<PK_Ops::Verification> -DSA_PublicKey::create_verification_op(const std::string& params, - const std::string& provider) const - { - if(provider == "base" || provider.empty()) - return std::unique_ptr<PK_Ops::Verification>(new DSA_Verification_Operation(*this, params)); - throw Provider_Not_Found(algo_name(), provider); - } - -std::unique_ptr<PK_Ops::Signature> -DSA_PrivateKey::create_signature_op(RandomNumberGenerator& rng, - const std::string& params, - const std::string& provider) const - { - if(provider == "base" || provider.empty()) - return std::unique_ptr<PK_Ops::Signature>(new DSA_Signature_Operation(*this, params, rng)); - throw Provider_Not_Found(algo_name(), provider); - } - -} |