From 6894dca64c04936d07048c0e8cbf7e25858548c3 Mon Sep 17 00:00:00 2001 From: lloyd Date: Fri, 10 Jan 2014 03:41:59 +0000 Subject: Move lib into src --- src/lib/pubkey/nr/info.txt | 9 +++ src/lib/pubkey/nr/nr.cpp | 143 +++++++++++++++++++++++++++++++++++++++++++++ src/lib/pubkey/nr/nr.h | 104 +++++++++++++++++++++++++++++++++ 3 files changed, 256 insertions(+) create mode 100644 src/lib/pubkey/nr/info.txt create mode 100644 src/lib/pubkey/nr/nr.cpp create mode 100644 src/lib/pubkey/nr/nr.h (limited to 'src/lib/pubkey/nr') diff --git a/src/lib/pubkey/nr/info.txt b/src/lib/pubkey/nr/info.txt new file mode 100644 index 000000000..8c2816fe7 --- /dev/null +++ b/src/lib/pubkey/nr/info.txt @@ -0,0 +1,9 @@ +define NYBERG_RUEPPEL 20131128 + + +dl_algo +dl_group +keypair +libstate +numbertheory + diff --git a/src/lib/pubkey/nr/nr.cpp b/src/lib/pubkey/nr/nr.cpp new file mode 100644 index 000000000..87cf3d038 --- /dev/null +++ b/src/lib/pubkey/nr/nr.cpp @@ -0,0 +1,143 @@ +/* +* Nyberg-Rueppel +* (C) 1999-2010 Jack Lloyd +* +* Distributed under the terms of the Botan license +*/ + +#include +#include +#include +#include + +namespace Botan { + +NR_PublicKey::NR_PublicKey(const AlgorithmIdentifier& alg_id, + const secure_vector& key_bits) : + DL_Scheme_PublicKey(alg_id, key_bits, DL_Group::ANSI_X9_57) + { + } + +/* +* NR_PublicKey Constructor +*/ +NR_PublicKey::NR_PublicKey(const DL_Group& grp, const BigInt& y1) + { + group = grp; + y = y1; + } + +/* +* Create a NR private key +*/ +NR_PrivateKey::NR_PrivateKey(RandomNumberGenerator& rng, + const DL_Group& grp, + const BigInt& x_arg) + { + group = grp; + x = x_arg; + + if(x == 0) + x = BigInt::random_integer(rng, 2, group_q() - 1); + + y = power_mod(group_g(), x, group_p()); + + if(x_arg == 0) + gen_check(rng); + else + load_check(rng); + } + +NR_PrivateKey::NR_PrivateKey(const AlgorithmIdentifier& alg_id, + const secure_vector& key_bits, + RandomNumberGenerator& rng) : + DL_Scheme_PrivateKey(alg_id, key_bits, DL_Group::ANSI_X9_57) + { + y = power_mod(group_g(), x, group_p()); + + load_check(rng); + } + +/* +* Check Private Nyberg-Rueppel Parameters +*/ +bool NR_PrivateKey::check_key(RandomNumberGenerator& rng, bool strong) const + { + if(!DL_Scheme_PrivateKey::check_key(rng, strong) || x >= group_q()) + return false; + + if(!strong) + return true; + + return KeyPair::signature_consistency_check(rng, *this, "EMSA1(SHA-1)"); + } + +NR_Signature_Operation::NR_Signature_Operation(const NR_PrivateKey& nr) : + q(nr.group_q()), + x(nr.get_x()), + powermod_g_p(nr.group_g(), nr.group_p()), + mod_q(nr.group_q()) + { + } + +secure_vector +NR_Signature_Operation::sign(const byte msg[], size_t msg_len, + RandomNumberGenerator& rng) + { + rng.add_entropy(msg, msg_len); + + BigInt f(msg, msg_len); + + if(f >= q) + throw Invalid_Argument("NR_Signature_Operation: Input is out of range"); + + BigInt c, d; + + while(c == 0) + { + BigInt k; + do + k.randomize(rng, q.bits()); + while(k >= q); + + c = mod_q.reduce(powermod_g_p(k) + f); + d = mod_q.reduce(k - x * c); + } + + secure_vector output(2*q.bytes()); + c.binary_encode(&output[output.size() / 2 - c.bytes()]); + d.binary_encode(&output[output.size() - d.bytes()]); + return output; + } + +NR_Verification_Operation::NR_Verification_Operation(const NR_PublicKey& nr) : + q(nr.group_q()), y(nr.get_y()) + { + powermod_g_p = Fixed_Base_Power_Mod(nr.group_g(), nr.group_p()); + powermod_y_p = Fixed_Base_Power_Mod(y, nr.group_p()); + mod_p = Modular_Reducer(nr.group_p()); + mod_q = Modular_Reducer(nr.group_q()); + } + +secure_vector +NR_Verification_Operation::verify_mr(const byte msg[], size_t msg_len) + { + const BigInt& q = mod_q.get_modulus(); + + if(msg_len != 2*q.bytes()) + throw Invalid_Argument("NR verification: Invalid signature"); + + BigInt c(msg, q.bytes()); + BigInt d(msg + q.bytes(), q.bytes()); + + if(c.is_zero() || c >= q || d >= q) + throw Invalid_Argument("NR verification: Invalid signature"); + + auto future_y_c = std::async(std::launch::async, powermod_y_p, c); + BigInt g_d = powermod_g_p(d); + + BigInt i = mod_p.multiply(g_d, future_y_c.get()); + return BigInt::encode_locked(mod_q.reduce(c - i)); + } + +} diff --git a/src/lib/pubkey/nr/nr.h b/src/lib/pubkey/nr/nr.h new file mode 100644 index 000000000..5be336a21 --- /dev/null +++ b/src/lib/pubkey/nr/nr.h @@ -0,0 +1,104 @@ +/* +* Nyberg-Rueppel +* (C) 1999-2010 Jack Lloyd +* +* Distributed under the terms of the Botan license +*/ + +#ifndef BOTAN_NYBERG_RUEPPEL_H__ +#define BOTAN_NYBERG_RUEPPEL_H__ + +#include +#include +#include +#include + +namespace Botan { + +/** +* Nyberg-Rueppel Public Key +*/ +class BOTAN_DLL NR_PublicKey : public virtual DL_Scheme_PublicKey + { + public: + std::string algo_name() const { return "NR"; } + + DL_Group::Format group_format() const { return DL_Group::ANSI_X9_57; } + + size_t message_parts() const { return 2; } + size_t message_part_size() const { return group_q().bytes(); } + size_t max_input_bits() const { return (group_q().bits() - 1); } + + NR_PublicKey(const AlgorithmIdentifier& alg_id, + const secure_vector& key_bits); + + NR_PublicKey(const DL_Group& group, const BigInt& pub_key); + protected: + NR_PublicKey() {} + }; + +/** +* Nyberg-Rueppel Private Key +*/ +class BOTAN_DLL NR_PrivateKey : public NR_PublicKey, + public virtual DL_Scheme_PrivateKey + { + public: + bool check_key(RandomNumberGenerator& rng, bool strong) const; + + NR_PrivateKey(const AlgorithmIdentifier& alg_id, + const secure_vector& key_bits, + RandomNumberGenerator& rng); + + NR_PrivateKey(RandomNumberGenerator& rng, + const DL_Group& group, + const BigInt& x = 0); + }; + +/** +* Nyberg-Rueppel signature operation +*/ +class BOTAN_DLL NR_Signature_Operation : public PK_Ops::Signature + { + public: + NR_Signature_Operation(const NR_PrivateKey& nr); + + size_t message_parts() const { return 2; } + size_t message_part_size() const { return q.bytes(); } + size_t max_input_bits() const { return (q.bits() - 1); } + + secure_vector sign(const byte msg[], size_t msg_len, + RandomNumberGenerator& rng); + private: + const BigInt& q; + const BigInt& x; + Fixed_Base_Power_Mod powermod_g_p; + Modular_Reducer mod_q; + }; + +/** +* Nyberg-Rueppel verification operation +*/ +class BOTAN_DLL NR_Verification_Operation : public PK_Ops::Verification + { + public: + NR_Verification_Operation(const NR_PublicKey& nr); + + size_t message_parts() const { return 2; } + size_t message_part_size() const { return q.bytes(); } + size_t max_input_bits() const { return (q.bits() - 1); } + + bool with_recovery() const { return true; } + + secure_vector verify_mr(const byte msg[], size_t msg_len); + private: + const BigInt& q; + const BigInt& y; + + Fixed_Base_Power_Mod powermod_g_p, powermod_y_p; + Modular_Reducer mod_p, mod_q; + }; + +} + +#endif -- cgit v1.2.3