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// --------------------------------------------------------------------------
//
// File
// Name: CipherDescription.h
// Purpose: Pure virtual base class for describing ciphers
// Created: 1/12/03
//
// --------------------------------------------------------------------------
#ifndef CIPHERDESCRIPTION__H
#define CIPHERDESCRIPTION__H
#ifndef BOX_LIB_CRYPTO_OPENSSL_HEADERS_INCLUDED_TRUE
#define BOX_LIB_CRYPTO_OPENSSL_HEADERS_INCLUDED_FALSE
class EVP_CIPHER;
class EVP_CIPHER_CTX;
#endif
// --------------------------------------------------------------------------
//
// Class
// Name: CipherDescription
// Purpose: Describes a cipher
// Created: 1/12/03
//
// --------------------------------------------------------------------------
class CipherDescription
{
public:
CipherDescription();
CipherDescription(const CipherDescription &rToCopy);
virtual ~CipherDescription();
CipherDescription &operator=(const CipherDescription &rToCopy);
// Return OpenSSL cipher object
virtual const EVP_CIPHER *GetCipher() const = 0;
// Setup any other parameters
virtual void SetupParameters(EVP_CIPHER_CTX *pCipherContext) const = 0;
// Mode parameter for cipher -- used in derived classes
typedef enum
{
Mode_ECB = 0,
Mode_CBC = 1,
Mode_CFB = 2,
Mode_OFB = 3
} CipherMode;
virtual std::string GetCipherName() const = 0;
virtual CipherMode GetCipherMode() const = 0;
virtual std::string GetFullName() const
{
std::ostringstream out;
out << GetCipherName() << "-";
switch (GetCipherMode())
{
case Mode_ECB: out << "ECB"; break;
case Mode_CBC: out << "CBC"; break;
case Mode_CFB: out << "CFB"; break;
case Mode_OFB: out << "OFB"; break;
default: out << "unknown";
}
return out.str();
}
#ifdef HAVE_OLD_SSL
// For the old version of OpenSSL, we need to be able to store cipher descriptions.
virtual CipherDescription *Clone() const = 0;
// And to be able to store new IVs
virtual void SetIV(const void *pIV) = 0;
#endif
};
#endif // CIPHERDESCRIPTION__H
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