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|
/* +------------------------------------+
* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
* InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
* E-mail:
* <brain@chatspike.net>
* <Craig@chatspike.net>
*
* Written by Craig Edwards, Craig McLure, and others.
* This program is free but copyrighted software; see
* the file COPYING for details.
*
* ---------------------------------------------------
*/
#ifndef __SHA256_H__
#define __SHA256_H__
#include "modules.h"
#define SHA256_DIGEST_SIZE (256 / 8)
#define SHA256_BLOCK_SIZE (512 / 8)
/** SHA256Request is the base class used to send SHA256 requests to m_sha256.so.
* You should not instantiate classes of type SHA256Request directly, instead
* you should instantiate classes of type SHA256ResetRequest, SHA256SumRequest,
* SHA256KeyRequest and SHA256HexRequest, shown below.
*/
class SHA256Request : public Request
{
/** The keys (IV) to use */
unsigned int* keys;
/** The output characters (hex sequence) to use */
const char* outputs;
/** The string to hash */
std::string tohash;
public:
/** Initialize SHA256Request as an SHA256_RESET message */
SHA256Request(Module* Me, Module* Target) : Request(Me, Target, "SHA256_RESET")
{
}
/** Initialize SHA256Request as an SHA256_SUM message */
SHA256Request(Module* Me, Module* Target, const std::string &hashable) : Request(Me, Target, "SHA256_SUM"), keys(NULL), outputs(NULL), tohash(hashable)
{
}
/** Initialize SHA256Request as an SHA256_KEY message */
SHA256Request(Module* Me, Module* Target, unsigned int* k) : Request(Me, Target, "SHA256_KEY"), keys(k), outputs(NULL), tohash("")
{
}
/** Initialize SHA256Request as an SHA256_HEX message */
SHA256Request(Module* Me, Module* Target, const char* out) : Request(Me, Target, "SHA256_HEX"), keys(NULL), outputs(out), tohash("")
{
}
/** Get data to be hashed */
const char* GetHashData()
{
return tohash.c_str();
}
/** Get keys (IVs) to be used */
unsigned int* GetKeyData()
{
return keys;
}
/** Get output characters (hex sequence) to be used */
const char* GetOutputs()
{
return outputs;
}
};
/** Send this class to m_sha256.so to reset the SHA256 module to a known state.
* This will reset the IV to the defaults specified by the SHA256 spec,
* and reset the hex sequence to "0123456789abcdef". It should be sent before
* ANY other Request types.
*
* Example:
* \code
* // Reset the SHA256 module.
* SHA256ResetRequest(this, SHA256Module).Send();
* \endcode
*/
class SHA256ResetRequest : public SHA256Request
{
public:
/** Initialize SHA256ResetRequest for sending.
* @param Me A pointer to the sending module
* @param Target A pointer to the m_sha256.so module
*/
SHA256ResetRequest(Module* Me, Module* Target) : SHA256Request(Me, Target)
{
}
};
/** Send this class to m_sha256.so to SHA256SUM a std::string.
* You should make sure you know the state of the module before you send this
* class, e.g. by first sending an SHA256ResetRequest class. The hash will be
* returned when you call Send().
*
* Example:
* \code
* // ALWAYS ALWAYS reset first, or set your own IV and hex chars.
* SHA256ResetRequest(this, SHA256Module).Send();
* // Get the SHA256 sum of the string 'doodads'.
* std::string result = SHA256SumRequest(this, SHA256Module, "doodads").Send();
* \endcode
*/
class SHA256SumRequest : public SHA256Request
{
public:
/** Initialize SHA256SumRequest for sending.
* @param Me A pointer to the sending module
* @param Target A pointer to the m_sha256.so module
* @param data The data to be hashed
*/
SHA256SumRequest(Module* Me, Module* Target, const std::string &data) : SHA256Request(Me, Target, data)
{
}
};
/** Send this class to m_sha256.so to change the IVs (keys) to use for hashing.
* You should make sure you know the state of the module before you send this
* class, e.g. by first sending an SHA256ResetRequest class. The default values for
* the IV's are those specified in the SHA256 specification. Only in very special
* circumstances should you need to change the IV's (see for example m_cloaking.cpp)
*
* Example:
* \code
* unsigned int iv[] = { 0xFFFFFFFF, 0x00000000, 0xAAAAAAAA, 0xCCCCCCCC };
* SHA256KeyRequest(this, SHA256Module, iv);
* \endcode
*/
class SHA256KeyRequest : public SHA256Request
{
public:
/** Initialize SHA256KeyRequest for sending.
* @param Me A pointer to the sending module
* @param Target A pointer to the m_sha256.so module
* @param data The new IV's. This should be an array of exactly four 32 bit values.
* On 64-bit architectures, the upper 32 bits of the values will be discarded.
*/
SHA256KeyRequest(Module* Me, Module* Target, unsigned int* data) : SHA256Request(Me, Target, data)
{
}
};
/** Send this class to m_sha256.so to change the hex sequence to use for generating the returned value.
* You should make sure you know the state of the module before you send this
* class, e.g. by first sending an SHA256ResetRequest class. The default value for
* the hex sequence is "0123456789abcdef". Only in very special circumstances should
* you need to change the hex sequence (see for example m_cloaking.cpp).
*
* Example:
* \code
* static const char tab[] = "fedcba9876543210";
* SHA256HexRequest(this, SHA256Module, tab);
* \endcode
*/
class SHA256HexRequest : public SHA256Request
{
public:
/** Initialize SHA256HexRequest for sending.
* @param Me A pointer to the sending module
* @param Target A pointer to the m_sha256.so module
* @param data The hex sequence to use. This should contain exactly 16 ASCII characters,
* terminated by a NULL char.
*/
SHA256HexRequest(Module* Me, Module* Target, const char* data) : SHA256Request(Me, Target, data)
{
}
};
#endif
|
