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/* +------------------------------------+
* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
* InspIRCd: (C) 2002-2007 InspIRCd Development Team
* See: http://www.inspircd.org/wiki/index.php/Credits
*
* This program is free but copyrighted software; see
* the file COPYING for details.
*
* ---------------------------------------------------
*/
#ifndef __HASH_H__
#define __HASH_H__
#include "modules.h"
#define SHA256_DIGEST_SIZE (256 / 8)
#define SHA256_BLOCK_SIZE (512 / 8)
/** HashRequest is the base class used to send Hash requests to hashing.so.
* You should not instantiate classes of type HashRequest directly, instead
* you should instantiate classes of type HashResetRequest, HashSumRequest,
* HashKeyRequest and HashHexRequest, shown below.
*/
class HashRequest : 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 HashRequest as an Hash_RESET message */
HashRequest(const char* req, Module* Me, Module* Target) : Request(Me, Target, req)
{
}
/** Initialize HashRequest as an Hash_SUM message */
HashRequest(Module* Me, Module* Target, const std::string &hashable) : Request(Me, Target, "SUM"), keys(NULL), outputs(NULL), tohash(hashable)
{
}
/** Initialize HashRequest as an Hash_KEY message */
HashRequest(Module* Me, Module* Target, unsigned int* k) : Request(Me, Target, "KEY"), keys(k), outputs(NULL), tohash("")
{
}
/** Initialize HashRequest as an Hash_HEX message */
HashRequest(Module* Me, Module* Target, const char* out) : Request(Me, Target, "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 the hashing module to query for its name.
*
* Example:
* \code
* cout << "Using hash algorithm: " << HashNameRequest(this, HashModule).Send();
* \endcode
*/
class HashNameRequest : public HashRequest
{
public:
/** Initialize HashNameRequest for sending.
* @param Me A pointer to the sending module
* @param Target A pointer to the hashing module
*/
HashNameRequest(Module* Me, Module* Target) : HashRequest("NAME", Me, Target)
{
}
};
/** Send this class to the hashing module to reset the Hash module to a known state.
* This will reset the IV to the defaults specified by the Hash spec,
* and reset the hex sequence to "0123456789abcdef". It should be sent before
* ANY other Request types.
*
* Example:
* \code
* // Reset the Hash module.
* HashResetRequest(this, HashModule).Send();
* \endcode
*/
class HashResetRequest : public HashRequest
{
public:
/** Initialize HashResetRequest for sending.
* @param Me A pointer to the sending module
* @param Target A pointer to the hashing module
*/
HashResetRequest(Module* Me, Module* Target) : HashRequest("RESET", Me, Target)
{
}
};
/** Send this class to the hashing module to HashSUM 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 HashResetRequest class. The hash will be
* returned when you call Send().
*
* Example:
* \code
* // ALWAYS ALWAYS reset first, or set your own IV and hex chars.
* HashResetRequest(this, HashModule).Send();
* // Get the Hash sum of the string 'doodads'.
* std::string result = HashSumRequest(this, HashModule, "doodads").Send();
* \endcode
*/
class HashSumRequest : public HashRequest
{
public:
/** Initialize HashSumRequest for sending.
* @param Me A pointer to the sending module
* @param Target A pointer to the hashing module
* @param data The data to be hashed
*/
HashSumRequest(Module* Me, Module* Target, const std::string &data) : HashRequest(Me, Target, data)
{
}
};
/** Send this class to hashing module 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 HashResetRequest class. The default values for
* the IV's are those specified in the Hash 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 };
* HashKeyRequest(this, HashModule, iv);
* \endcode
*/
class HashKeyRequest : public HashRequest
{
public:
/** Initialize HashKeyRequest for sending.
* @param Me A pointer to the sending module
* @param Target A pointer to the hashing 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.
*/
HashKeyRequest(Module* Me, Module* Target, unsigned int* data) : HashRequest(Me, Target, data)
{
}
};
/** Send this class to the hashing module 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 HashResetRequest 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";
* HashHexRequest(this, HashModule, tab);
* \endcode
*/
class HashHexRequest : public HashRequest
{
public:
/** Initialize HashHexRequest for sending.
* @param Me A pointer to the sending module
* @param Target A pointer to the hashing module
* @param data The hex sequence to use. This should contain exactly 16 ASCII characters,
* terminated by a NULL char.
*/
HashHexRequest(Module* Me, Module* Target, const char* data) : HashRequest(Me, Target, data)
{
}
};
#endif
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