// NeL - MMORPG Framework
// Copyright (C) 2010 Winch Gate Property Limited
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see .
//
// Includes
//
#include "stdmisc.h"
#include "nel/misc/sha1.h"
#include "nel/misc/file.h"
#include "nel/misc/path.h"
//
// Namespaces
//
using namespace std;
using namespace NLMISC;
#ifdef DEBUG_NEW
#define new DEBUG_NEW
#endif
//
// Types
//
/*
* If you do not have the ISO standard stdint.h header file, then you
* must typedef the following:
* name meaning
* uint32_t unsigned 32 bit integer
* uint8_t unsigned 8 bit integer (i.e., unsigned char)
* int_least16_t integer of >= 16 bits
*
*/
typedef unsigned int uint32_t;
typedef unsigned char uint8_t;
typedef short int_least16_t;
//
// Constantes
//
static const int bufferSize = 100000;
static uint8_t buffer[bufferSize];
enum
{
shaSuccess = 0,
shaNull, /* Null pointer parameter */
shaInputTooLong, /* input data too long */
shaStateError /* called Input after Result */
};
#define SHA1HashSize 20
/*
* This structure will hold context information for the SHA-1
* hashing operation
*/
typedef struct SHA1Context
{
uint32_t Intermediate_Hash[SHA1HashSize/4]; /* Message Digest */
uint32_t Length_Low; /* Message length in bits */
uint32_t Length_High; /* Message length in bits */
/* Index into message block array */
int_least16_t Message_Block_Index;
uint8_t Message_Block[64]; /* 512-bit message blocks */
int Computed; /* Is the digest computed? */
int Corrupted; /* Is the message digest corrupted? */
} SHA1Context;
//
// Function Prototypes
//
int SHA1Reset (SHA1Context *);
int SHA1Input (SHA1Context *, const uint8_t *, unsigned int);
int SHA1Result (SHA1Context *, uint8_t Message_Digest[SHA1HashSize]);
//
// Functions
//
CHashKey getSHA1(const uint8 *buffer, uint32 size)
{
SHA1Context sha;
int err;
uint8_t Message_Digest[20];
err = SHA1Reset(&sha);
if (err)
{
nlwarning("SHA: SHA1Reset Error %d.\n", err );
return CHashKey();
}
err = SHA1Input(&sha, (const uint8_t*)buffer, size);
if (err)
{
nlwarning ("SHA: SHA1Input Error %d.\n", err);
return CHashKey();
}
err = SHA1Result(&sha, Message_Digest);
if (err)
{
nlwarning("SHA: SHA1Result Error %d, could not compute message digest.\n", err );
return CHashKey();
}
CHashKey hk (Message_Digest);
return hk;
}
CHashKey getSHA1(const string &filename, bool forcePath)
{
SHA1Context sha;
int err;
uint8_t Message_Digest[20];
//printf("reading '%s'\n", findData.cFileName);
CIFile ifile;
ifile.setCacheFileOnOpen(true);
if (!ifile.open(forcePath ? filename:CPath::lookup(filename)))
{
nlwarning ("SHA: Can't open the file '%s'", filename.c_str());
return CHashKey();
}
//FILE *fp = nlfopen (filename, "rb");
//if (fp == NULL) return CHashKey();
err = SHA1Reset(&sha);
if (err)
{
nlwarning("SHA: SHA1Reset Error %d.\n", err );
ifile.close ();
return CHashKey();
}
sint fs = ifile.getFileSize();
sint n, read = 0;
do
{
//bs = (int)fread (buffer, 1, bufferSize, fp);
n = std::min (bufferSize, fs-read);
//nlinfo ("read %d bytes", n);
ifile.serialBuffer((uint8 *)buffer, n);
err = SHA1Input(&sha, buffer, n);
if (err)
{
nlwarning ("SHA: SHA1Input Error %d.\n", err);
ifile.close();
return CHashKey();
}
read += n;
}
while (!ifile.eof());
ifile.close ();
err = SHA1Result(&sha, Message_Digest);
if (err)
{
nlwarning("SHA: SHA1Result Error %d, could not compute message digest.\n", err );
return CHashKey();
}
CHashKey hk (Message_Digest);
return hk;
}
/*
*
* HMAC = hash( (Key ^ 0x5c) .. hash( (Key ^0x36) .. Message ) )
*
*/
CHashKey getHMacSHA1(const uint8 *text, uint32 text_len, const uint8 *key, uint32 key_len)
{
SHA1Context sha;
uint8_t SHA1_Key[64];
uint8_t SHA1_Key1[20];
uint8_t SHA1_Key2[20];
string buffer1;
string buffer2;
// Init some vars
for (uint i = 0; i < 64; i++)
SHA1_Key[i] = 0;
// If lenght of key > 64 use sha1 hash
if (key_len > 64) {
uint8_t SHA1_Key0[20];
SHA1Reset(&sha);
SHA1Input(&sha, (const uint8_t*)key, key_len);
SHA1Result(&sha, SHA1_Key0);
CHashKey hk0 (SHA1_Key0);
for (uint i = 0; i < 20; i++)
SHA1_Key[i] = hk0.HashKeyString[i];
} else {
for (uint i = 0; i < key_len; i++)
SHA1_Key[i] = key[i];
}
// Do 0x36 XOR Key
for (uint i = 0; i < 64; i++)
buffer1 += 0x36 ^ SHA1_Key[i];
// Append text
for (uint i = 0; i < text_len; i++)
buffer1 += text[i];
// Get hash
SHA1Reset(&sha);
SHA1Input(&sha, (const uint8_t*)buffer1.c_str(), (uint)buffer1.size());
SHA1Result(&sha, SHA1_Key1);
CHashKey hk1 (SHA1_Key1);
// Do 0x5c XOR Key
for (uint i = 0; i < 64; i++)
buffer2 += 0x5c ^ SHA1_Key[i];
// Append previous hash
for (uint i = 0; i < 20; i++)
buffer2 += hk1.HashKeyString[i];
// Get new hash
SHA1Reset(&sha);
SHA1Input(&sha, (const uint8_t*)buffer2.c_str(), (uint)buffer2.size());
SHA1Result(&sha, SHA1_Key2);
CHashKey hk (SHA1_Key2);
return hk;
}
#ifdef _MFC_VER
#pragma runtime_checks( "", off )
#endif
/*
* Define the SHA1 circular left shift macro
*/
#define SHA1CircularShift(bits,word) \
(((word) << (bits)) | ((word) >> (32-(bits))))
/* Local Function Prototypes */
void SHA1PadMessage(SHA1Context *);
void SHA1ProcessMessageBlock(SHA1Context *);
/*
* SHA1Reset
*
* Description:
* This function will initialize the SHA1Context in preparation
* for computing a new SHA1 message digest.
*
* Parameters:
* context: [in/out]
* The context to reset.
*
* Returns:
* sha Error Code.
*
*/
int SHA1Reset(SHA1Context *context)
{
if (!context)
{
return shaNull;
}
context->Length_Low = 0;
context->Length_High = 0;
context->Message_Block_Index = 0;
context->Intermediate_Hash[0] = 0x67452301;
context->Intermediate_Hash[1] = 0xEFCDAB89;
context->Intermediate_Hash[2] = 0x98BADCFE;
context->Intermediate_Hash[3] = 0x10325476;
context->Intermediate_Hash[4] = 0xC3D2E1F0;
context->Computed = 0;
context->Corrupted = 0;
return shaSuccess;
}
/*
* SHA1Result
*
* Description:
* This function will return the 160-bit message digest into the
* Message_Digest array provided by the caller.
* NOTE: The first octet of hash is stored in the 0th element,
* the last octet of hash in the 19th element.
*
* Parameters:
* context: [in/out]
* The context to use to calculate the SHA-1 hash.
* Message_Digest: [out]
* Where the digest is returned.
*
* Returns:
* sha Error Code.
*
*/
int SHA1Result( SHA1Context *context,
uint8_t Message_Digest[SHA1HashSize])
{
int i;
if (!context || !Message_Digest)
{
return shaNull;
}
if (context->Corrupted)
{
return context->Corrupted;
}
if (!context->Computed)
{
SHA1PadMessage(context);
for(i=0; i<64; ++i)
{
/* message may be sensitive, clear it out */
context->Message_Block[i] = 0;
}
context->Length_Low = 0; /* and clear length */
context->Length_High = 0;
context->Computed = 1;
}
for(i = 0; i < SHA1HashSize; ++i)
{
Message_Digest[i] = uint8_t((context->Intermediate_Hash[i>>2]
>> 8 * ( 3 - ( i & 0x03 ) ) ) & 0xff );
}
return shaSuccess;
}
/*
* SHA1Input
*
* Description:
* This function accepts an array of octets as the next portion
* of the message.
*
* Parameters:
* context: [in/out]
* The SHA context to update
* message_array: [in]
* An array of characters representing the next portion of
* the message.
* length: [in]
* The length of the message in message_array
*
* Returns:
* sha Error Code.
*
*/
int SHA1Input( SHA1Context *context,
const uint8_t *message_array,
unsigned length)
{
if (!length)
{
return shaSuccess;
}
if (!context || !message_array)
{
return shaNull;
}
if (context->Computed)
{
context->Corrupted = shaStateError;
return shaStateError;
}
if (context->Corrupted)
{
return context->Corrupted;
}
while(length-- && !context->Corrupted)
{
context->Message_Block[context->Message_Block_Index++] =
(*message_array & 0xFF);
context->Length_Low += 8;
if (context->Length_Low == 0)
{
context->Length_High++;
if (context->Length_High == 0)
{
/* Message is too long */
context->Corrupted = 1;
}
}
if (context->Message_Block_Index == 64)
{
SHA1ProcessMessageBlock(context);
}
message_array++;
}
return shaSuccess;
}
/*
* SHA1ProcessMessageBlock
*
* Description:
* This function will process the next 512 bits of the message
* stored in the Message_Block array.
*
* Parameters:
* None.
*
* Returns:
* Nothing.
*
* Comments:
* Many of the variable names in this code, especially the
* single character names, were used because those were the
* names used in the publication.
*
*
*/
void SHA1ProcessMessageBlock(SHA1Context *context)
{
const uint32_t K[] = { /* Constants defined in SHA-1 */
0x5A827999,
0x6ED9EBA1,
0x8F1BBCDC,
0xCA62C1D6
};
int t; /* Loop counter */
uint32_t temp; /* Temporary word value */
uint32_t W[80]; /* Word sequence */
uint32_t A, B, C, D, E; /* Word buffers */
/*
* Initialize the first 16 words in the array W
*/
for(t = 0; t < 16; t++)
{
W[t] = context->Message_Block[t * 4] << 24;
W[t] |= context->Message_Block[t * 4 + 1] << 16;
W[t] |= context->Message_Block[t * 4 + 2] << 8;
W[t] |= context->Message_Block[t * 4 + 3];
}
for(t = 16; t < 80; t++)
{
W[t] = SHA1CircularShift(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]);
}
A = context->Intermediate_Hash[0];
B = context->Intermediate_Hash[1];
C = context->Intermediate_Hash[2];
D = context->Intermediate_Hash[3];
E = context->Intermediate_Hash[4];
for(t = 0; t < 20; t++)
{
temp = SHA1CircularShift(5,A) +
((B & C) | ((~B) & D)) + E + W[t] + K[0];
E = D;
D = C;
C = SHA1CircularShift(30,B);
B = A;
A = temp;
}
for(t = 20; t < 40; t++)
{
temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[1];
E = D;
D = C;
C = SHA1CircularShift(30,B);
B = A;
A = temp;
}
for(t = 40; t < 60; t++)
{
temp = SHA1CircularShift(5,A) +
((B & C) | (B & D) | (C & D)) + E + W[t] + K[2];
E = D;
D = C;
C = SHA1CircularShift(30,B);
B = A;
A = temp;
}
for(t = 60; t < 80; t++)
{
temp = SHA1CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[3];
E = D;
D = C;
C = SHA1CircularShift(30,B);
B = A;
A = temp;
}
context->Intermediate_Hash[0] += A;
context->Intermediate_Hash[1] += B;
context->Intermediate_Hash[2] += C;
context->Intermediate_Hash[3] += D;
context->Intermediate_Hash[4] += E;
context->Message_Block_Index = 0;
}
/*
* SHA1PadMessage
*
* Description:
* According to the standard, the message must be padded to an even
* 512 bits. The first padding bit must be a '1'. The last 64
* bits represent the length of the original message. All bits in
* between should be 0. This function will pad the message
* according to those rules by filling the Message_Block array
* accordingly. It will also call the ProcessMessageBlock function
* provided appropriately. When it returns, it can be assumed that
* the message digest has been computed.
*
* Parameters:
* context: [in/out]
* The context to pad
* ProcessMessageBlock: [in]
* The appropriate SHA*ProcessMessageBlock function
* Returns:
* Nothing.
*
*/
void SHA1PadMessage(SHA1Context *context)
{
/*
* Check to see if the current message block is too small to hold
* the initial padding bits and length. If so, we will pad the
* block, process it, and then continue padding into a second
* block.
*/
if (context->Message_Block_Index > 55)
{
context->Message_Block[context->Message_Block_Index++] = 0x80;
while(context->Message_Block_Index < 64)
{
context->Message_Block[context->Message_Block_Index++] = 0;
}
SHA1ProcessMessageBlock(context);
while(context->Message_Block_Index < 56)
{
context->Message_Block[context->Message_Block_Index++] = 0;
}
}
else
{
context->Message_Block[context->Message_Block_Index++] = 0x80;
while(context->Message_Block_Index < 56)
{
context->Message_Block[context->Message_Block_Index++] = 0;
}
}
/*
* Store the message length as the last 8 octets
*/
context->Message_Block[56] = uint8_t((context->Length_High >> 24)&0xff);
context->Message_Block[57] = uint8_t((context->Length_High >> 16)&0xff);
context->Message_Block[58] = uint8_t((context->Length_High >> 8)&0xff);
context->Message_Block[59] = uint8_t((context->Length_High)&0xff);
context->Message_Block[60] = uint8_t((context->Length_Low >> 24)&0xff);
context->Message_Block[61] = uint8_t((context->Length_Low >> 16)&0xff);
context->Message_Block[62] = uint8_t((context->Length_Low >> 8)&0xff);
context->Message_Block[63] = uint8_t((context->Length_Low)&0xff);
SHA1ProcessMessageBlock(context);
}