ecc.h

Go to the documentation of this file.

/*
BSD 3-Clause License
 
Copyright (c) 2022, Stable Cloud Computing, Inc.
 
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
 
1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
 
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.
 
3. Neither the name of the copyright holder nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.
 
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _SCC_CRYPTO_ECC_H
#define _SCC_CRYPTO_ECC_H
 
#include <memory>
#include <vector>
#include <crypto/bignum.h>
 
namespace scc::crypto {
 
struct EccGfpBase;
struct EccGfpPointBase;
class EccGfpPoint;
 
class EccGfp
{
    friend class EccGfpPoint;
 
    std::shared_ptr<EccGfpBase> m_ctx;
 
public:
 
    enum class Type
    {
        std_p192r1,         
        std_p224r1,         
        std_p256r1,         
        std_p384r1,         
        std_p521r1,         
        std_p256sm2,        
        //curve_25519,      ///< X25519 algorithm (128 bit security level)
        //curve_448,        ///< X448 algorithm (224 bit security level)
    };
 
    EccGfp(Type type = Type::std_p256r1);
    virtual ~EccGfp();
 
    void reset(Type type);
 
    static bool valid(const EccGfp&);
    bool valid() const
    {
        return valid(*this);
    }
    
    int bit_width() const;
 
    void generate_key_pair(Bignum& priv_key, EccGfpPoint& pub_key)
    {
        private_key(priv_key);
        public_key(priv_key, pub_key);
    }
 
    static bool validate_key_pair(const Bignum&, const EccGfpPoint&);
 
    void private_key(Bignum&);
 
    void public_key(const Bignum&, EccGfpPoint&);
 
    void generate_public_key(const Bignum&, EccGfpPoint&);
 
    static void sign_ecdsa(const void*, int, const EccGfp&, const scc::crypto::Bignum&, scc::crypto::Bignum&, scc::crypto::Bignum&, scc::crypto::Bignum&);
 
    static void sign_ecdsa(const void* loc, int len, const EccGfp::Type& t, const scc::crypto::Bignum& rk, scc::crypto::Bignum& tk, scc::crypto::Bignum& x, scc::crypto::Bignum& y)
    {
        EccGfp curve(t);
        sign_ecdsa(loc, len, curve, rk, tk, x, y);
    }
 
    static bool verify_ecdsa(const void*, int, const EccGfpPoint&, const scc::crypto::Bignum&, const scc::crypto::Bignum&);
 
    static void dh_shared_secret(const scc::crypto::Bignum&, const EccGfpPoint&, scc::crypto::Bignum&);
};
 
class EccGfpPoint
{
    friend class EccGfp;
    friend class EcdsaSignature;
 
    std::shared_ptr<EccGfpPointBase> m_ctx;
 
public:
    EccGfpPoint() {}
    EccGfpPoint(const EccGfp& curve)
    {
        reset(curve);
    }
    EccGfpPoint(const EccGfp::Type& curve_type)
    {
        EccGfp curve(curve_type);
        reset(curve);
    }
 
    virtual ~EccGfpPoint();
 
    void reset()
    {
        m_ctx.reset();
    }
    void reset(const EccGfp&);
 
    void set(const scc::crypto::Bignum&, const scc::crypto::Bignum&);
 
    void set(const scc::crypto::Bignum& x, const scc::crypto::Bignum& y, EccGfp& curve)
    {
        reset(curve);
        set(x, y);
    }
    void set(const void*, int);
    void set(const std::vector<char>& v)
    {
        set(v.data(), v.size());
    }
    
    void set(const void* loc, int len, EccGfp& curve)
    {
        reset(curve);
        set(loc, len);
    }
    void set(const std::vector<char>& v, EccGfp& curve)
    {
        set(v.data(), v.size(), curve);
    }
 
    void set();
 
    void get(scc::crypto::Bignum&, scc::crypto::Bignum&) const;
    void get(std::vector<char>&) const;
 
    static bool infinite(const EccGfpPoint&, const EccGfp&);
    bool infinite(const EccGfp& curve) const
    {
        return infinite(*this, curve);
    }
 
    static bool infinite(const EccGfpPoint&);
    bool infinite() const
    {
        return infinite(*this);
    }
 
    static bool valid(const EccGfpPoint&, const EccGfp&);
    bool valid(const EccGfp& curve) const
    {
        return valid(*this, curve);
    }
    
    static bool valid(const EccGfpPoint&);
    bool valid() const
    {
        return valid(*this);
    }
 
    bool equal(const EccGfpPoint&) const;
 
    bool operator==(const EccGfpPoint& b) const
    {
        return equal(b);
    }
    bool operator!=(const EccGfpPoint& b) const
    {
        return !equal(b);
    }
};
 
}       // namespace
 
#endif