rsa.h

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*/
#ifndef _SCC_CRYPTO_RSA_H
#define _SCC_CRYPTO_RSA_H
 
#include <string>
#include <vector>
#include <memory>
#include <crypto/bignum.h>
#include <crypto/hash.h>
 
namespace scc::crypto {
 
class RsaPrivateKey;
 
class RsaPublicKey
{
    friend class PkcsSignature;
    friend class PssSignature;
    friend class RsaOaepEncrypt;
    friend class RsaPrivateKey;
 
protected:
    scc::crypto::Bignum m_n;        // modulus
    scc::crypto::Bignum m_e;        // public exponent
 
private:
    
    void move(RsaPublicKey& other)
    {
        m_n = std::move(other.m_n);
        m_e = std::move(other.m_e);
    }
 
    void copy(const RsaPublicKey& other)
    {
        m_n = other.m_n;
        m_e = other.m_e;
    }
 
public:
    RsaPublicKey();
    virtual ~RsaPublicKey();
 
    RsaPublicKey(RsaPublicKey&& other) : RsaPublicKey()
    {
        move(other);
    }
    RsaPublicKey& operator=(RsaPublicKey&& other)
    {
        move(other);
        return *this;
    }
 
    RsaPublicKey(const RsaPublicKey& other) : RsaPublicKey()
    {
        copy(other);
    }
    RsaPublicKey& operator=(const RsaPublicKey& other)
    {
        copy(other);
        return *this;
    }
 
    bool operator==(const RsaPublicKey& o) const
    {
        return m_n == o.m_n && m_e == o.m_e;
    }
    
    bool operator!=(const RsaPublicKey& o) const
    {
        return m_n != o.m_n || m_e != o.m_e;
    }
 
    void get(scc::crypto::Bignum& n, scc::crypto::Bignum& e) const
    {
        n = m_n;
        e = m_e;
    }
 
    void set(const scc::crypto::Bignum& n, const scc::crypto::Bignum& e)
    {
        m_n = n;
        m_e = e;
    }
    
    void clear();
 
    std::string dump() const;
 
    std::string str(unsigned = 8) const;
 
    int width() const;
 
    int width_bytes() const
    {
        return ((width()+7)&~7)/8;
    }
};
 
class RsaPrivateKey : public RsaPublicKey
{
    friend class PssSignature;
    friend class PkcsSignature;
    friend class RsaOaepDecrypt;
    
    scc::crypto::Bignum m_d;        // private exponent
    scc::crypto::Bignum m_p;        // prime 1
    scc::crypto::Bignum m_q;        // prime 2
    scc::crypto::Bignum m_ep;       // exponent 1
    scc::crypto::Bignum m_eq;       // exponent 2
    scc::crypto::Bignum m_qinv;     // inverse coefficient
 
    void move(RsaPrivateKey& other)
    {
        m_n = std::move(other.m_n);
        m_e = std::move(other.m_e);
        m_d = std::move(other.m_d);
        m_p = std::move(other.m_p);
        m_q = std::move(other.m_q);
        m_ep = std::move(other.m_ep);
        m_eq = std::move(other.m_eq);
        m_qinv = std::move(other.m_qinv);
    }
 
    void copy(const RsaPrivateKey& other)
    {
        m_n = other.m_n;
        m_e = other.m_e;
        m_d = other.m_d;
        m_p = other.m_p;
        m_q = other.m_q;
        m_ep = other.m_ep;
        m_eq = other.m_eq;
        m_qinv = other.m_qinv;
    }
 
public:
    RsaPrivateKey();
    virtual ~RsaPrivateKey();
 
    RsaPrivateKey(RsaPrivateKey&& other) : RsaPrivateKey()
    {
        move(other);
    }
    RsaPrivateKey& operator=(RsaPrivateKey&& other)
    {
        move(other);
        return *this;
    }
 
    RsaPrivateKey(const RsaPrivateKey& other) : RsaPrivateKey()
    {
        copy(other);
    }
    RsaPrivateKey& operator=(const RsaPrivateKey& other)
    {
        copy(other);
        return *this;
    }
 
    bool operator==(const RsaPrivateKey& o) const
    {
        return m_n == o.m_n && m_e == o.m_e && m_d == o.m_d && m_p == o.m_p && m_q == o.m_q && m_ep == o.m_ep && m_eq == o.m_eq && m_qinv == o.m_qinv;
    }
    
    bool operator!=(const RsaPrivateKey& o) const
    {
        return m_n != o.m_n || m_e != o.m_e || m_d != o.m_d || m_p != o.m_p || m_q != o.m_q || m_ep != o.m_ep || m_eq != o.m_eq || m_qinv != o.m_qinv;
    }
 
    void clear();
 
    std::string dump() const;
 
    std::string str(unsigned = 8) const;
 
    void generate(int);
 
    bool validate(const RsaPublicKey&) const;
 
    bool validate() const
    {
        return validate(pub_key());
    }
 
    void get(scc::crypto::Bignum& n, scc::crypto::Bignum& e,
        scc::crypto::Bignum& d, scc::crypto::Bignum& p, scc::crypto::Bignum& q,
        scc::crypto::Bignum& ep, scc::crypto::Bignum& eq, scc::crypto::Bignum& qinv) const
    {
        n = m_n;
        e = m_e;
        d = m_d;
        p = m_p;
        q = m_q;
        ep = m_ep;
        eq = m_eq;
        qinv = m_qinv;
    }
 
    void set(const scc::crypto::Bignum& n, const scc::crypto::Bignum& e,
        scc::crypto::Bignum& d, scc::crypto::Bignum& p, scc::crypto::Bignum& q,
        scc::crypto::Bignum& ep, scc::crypto::Bignum& eq, scc::crypto::Bignum& qinv)
    {
        m_n = n;
        m_e = e;
        m_d = d;
        m_p = p;
        m_q = q;
        m_ep = ep;
        m_eq = eq;
        m_qinv = qinv;
    }
 
    RsaPublicKey pub_key() const
    {
        RsaPublicKey pub;
        pub.set(m_n, m_e);
        return pub;
    }
};
 
struct RsaOaepEncryptCtx;
 
class RsaOaepEncrypt
{
    std::unique_ptr<RsaOaepEncryptCtx> m_ctx;
 
public:
    RsaOaepEncrypt(RsaPublicKey&, Hash::Algorithm = Hash::sha1_type);
    virtual ~RsaOaepEncrypt();
    int max_msg_size() const;
    int cipher_size() const;
    
    void encrypt(const void*, int, void*, int, const void* = nullptr, int = 0);
};
 
struct RsaOaepDecryptCtx;
 
class RsaOaepDecrypt
{
    std::unique_ptr<RsaOaepDecryptCtx> m_ctx;
 
public:
    RsaOaepDecrypt(RsaPrivateKey&, Hash::Algorithm = Hash::sha1_type);
    virtual ~RsaOaepDecrypt();
    int max_msg_size() const;
    int cipher_size() const;
 
    int decrypt(void*, int, const void*, int, const void* = nullptr, int = 0);
};
 
class PssSignature
{
public:
    enum class HashType
    {
        md5,
        sha1,
        sha224,
        sha256,
        sha384,
        sha512,
    };
    static int size(const RsaPublicKey& k)
    {
        return k.width_bytes();
    }
 
    static void sign(const void*, int, void*, int, const RsaPrivateKey&, PssSignature::HashType, int = 0);
    static void sign(const void* loc, int len, std::vector<char>& sig, const RsaPrivateKey& key, PssSignature::HashType hash, int salt_len = 0)
    {
        sig.resize(size(key));
        sign(loc, len, sig.data(), sig.size(), key, hash, salt_len);
    }
    
    static bool verify(const void*, int, const void*, int, const RsaPublicKey&, PssSignature::HashType);
    static bool verify(const void* loc, int len, const std::vector<char>& sig, const RsaPublicKey& key, PssSignature::HashType hash)
    {
        return verify(loc, len, sig.data(), sig.size(), key, hash);
    }
};
 
class PkcsSignature
{
public:
    enum class HashType
    {
        md5,
        sha1,
        sha224,
        sha256,
        sha384,
        sha512,
    };
 
    static int size(const RsaPublicKey& k)
    {
        return k.width_bytes();
    }
 
    static void sign(const void*, int, void*, int, const RsaPrivateKey&, PkcsSignature::HashType);
    static void sign(const void* loc, int len, std::vector<char>& sig, const RsaPrivateKey& key, PkcsSignature::HashType hash)
    {
        sig.resize(size(key));
        sign(loc, len, sig.data(), sig.size(), key, hash);
    }
    static void sign(const void* loc, int len, std::vector<uint8_t>& sig, const RsaPrivateKey& key, PkcsSignature::HashType hash)
    {
        sig.resize(size(key));
        sign(loc, len, sig.data(), sig.size(), key, hash);
    }
    
    static bool verify(const void*, int, const void*, int, const RsaPublicKey&, PkcsSignature::HashType);
    static bool verify(const void* loc, int len, const std::vector<char>& sig, const RsaPublicKey& key, PkcsSignature::HashType hash)
    {
        return verify(loc, len, sig.data(), sig.size(), key, hash);
    }
};
 
}       // namespace
 
#endif