fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
298 lines
9.5 KiB
298 lines
9.5 KiB
// Portions copyright (c) 2011 The LevelDB Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file. See the AUTHORS file for names of contributors.
|
|
//
|
|
// This module provides a slow but portable implementation of
|
|
// the SHA1 hash function.
|
|
//
|
|
// It is adapted from free code written by Paul E. Jones
|
|
// <paulej@packetizer.com>. See http://www.packetizer.com/security/sha1/
|
|
//
|
|
// The license for the original code is:
|
|
/*
|
|
Copyright (C) 1998, 2009
|
|
Paul E. Jones <paulej@packetizer.com>
|
|
|
|
Freeware Public License (FPL)
|
|
|
|
This software is licensed as "freeware." Permission to distribute
|
|
this software in source and binary forms, including incorporation
|
|
into other products, is hereby granted without a fee. THIS SOFTWARE
|
|
IS PROVIDED 'AS IS' AND WITHOUT ANY EXPRESSED OR IMPLIED WARRANTIES,
|
|
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
|
|
AND FITNESS FOR A PARTICULAR PURPOSE. THE AUTHOR SHALL NOT BE HELD
|
|
LIABLE FOR ANY DAMAGES RESULTING FROM THE USE OF THIS SOFTWARE, EITHER
|
|
DIRECTLY OR INDIRECTLY, INCLUDING, BUT NOT LIMITED TO, LOSS OF DATA
|
|
OR DATA BEING RENDERED INACCURATE.
|
|
*/
|
|
|
|
#include "port/sha1_portable.h"
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <stdint.h>
|
|
|
|
namespace leveldb {
|
|
namespace port {
|
|
|
|
/*
|
|
* Description:
|
|
* This class implements the Secure Hashing Standard as defined
|
|
* in FIPS PUB 180-1 published April 17, 1995.
|
|
*/
|
|
|
|
/*
|
|
* This structure will hold context information for the hashing
|
|
* operation
|
|
*/
|
|
typedef struct SHA1Context {
|
|
unsigned Message_Digest[5]; /* Message Digest (output) */
|
|
|
|
unsigned Length_Low; /* Message length in bits */
|
|
unsigned Length_High; /* Message length in bits */
|
|
|
|
unsigned char Message_Block[64]; /* 512-bit message blocks */
|
|
int Message_Block_Index; /* Index into message block array */
|
|
|
|
bool Computed; /* Is the digest computed? */
|
|
bool Corrupted; /* Is the message digest corruped? */
|
|
} SHA1Context;
|
|
|
|
/*
|
|
* Portability Issues:
|
|
* SHA-1 is defined in terms of 32-bit "words". This code was
|
|
* written with the expectation that the processor has at least
|
|
* a 32-bit machine word size. If the machine word size is larger,
|
|
* the code should still function properly. One caveat to that
|
|
* is that the input functions taking characters and character
|
|
* arrays assume that only 8 bits of information are stored in each
|
|
* character.
|
|
*/
|
|
|
|
/*
|
|
* Define the circular shift macro
|
|
*/
|
|
#define SHA1CircularShift(bits,word) \
|
|
((((word) << (bits)) & 0xFFFFFFFF) | \
|
|
((word) >> (32-(bits))))
|
|
|
|
/* Function prototypes */
|
|
static void SHA1ProcessMessageBlock(SHA1Context *);
|
|
static void SHA1PadMessage(SHA1Context *);
|
|
|
|
// Initialize the SHA1Context in preparation for computing a new
|
|
// message digest.
|
|
static void SHA1Reset(SHA1Context* context) {
|
|
context->Length_Low = 0;
|
|
context->Length_High = 0;
|
|
context->Message_Block_Index = 0;
|
|
|
|
context->Message_Digest[0] = 0x67452301;
|
|
context->Message_Digest[1] = 0xEFCDAB89;
|
|
context->Message_Digest[2] = 0x98BADCFE;
|
|
context->Message_Digest[3] = 0x10325476;
|
|
context->Message_Digest[4] = 0xC3D2E1F0;
|
|
|
|
context->Computed = false;
|
|
context->Corrupted = false;
|
|
}
|
|
|
|
// This function will return the 160-bit message digest into the
|
|
// Message_Digest array within the SHA1Context provided
|
|
static bool SHA1Result(SHA1Context *context) {
|
|
if (context->Corrupted) {
|
|
return false;
|
|
}
|
|
|
|
if (!context->Computed) {
|
|
SHA1PadMessage(context);
|
|
context->Computed = true;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// This function accepts an array of bytes as the next portion of
|
|
// the message.
|
|
static void SHA1Input(SHA1Context *context,
|
|
const unsigned char *message_array,
|
|
unsigned length) {
|
|
if (!length) return;
|
|
|
|
if (context->Computed || context->Corrupted) {
|
|
context->Corrupted = true;
|
|
return;
|
|
}
|
|
|
|
while(length-- && !context->Corrupted) {
|
|
context->Message_Block[context->Message_Block_Index++] =
|
|
(*message_array & 0xFF);
|
|
|
|
context->Length_Low += 8;
|
|
/* Force it to 32 bits */
|
|
context->Length_Low &= 0xFFFFFFFF;
|
|
if (context->Length_Low == 0) {
|
|
context->Length_High++;
|
|
/* Force it to 32 bits */
|
|
context->Length_High &= 0xFFFFFFFF;
|
|
if (context->Length_High == 0)
|
|
{
|
|
/* Message is too long */
|
|
context->Corrupted = true;
|
|
}
|
|
}
|
|
|
|
if (context->Message_Block_Index == 64)
|
|
{
|
|
SHA1ProcessMessageBlock(context);
|
|
}
|
|
|
|
message_array++;
|
|
}
|
|
}
|
|
|
|
// This function will process the next 512 bits of the message stored
|
|
// in the Message_Block array.
|
|
static void SHA1ProcessMessageBlock(SHA1Context *context) {
|
|
const unsigned K[] = // Constants defined in SHA-1
|
|
{
|
|
0x5A827999,
|
|
0x6ED9EBA1,
|
|
0x8F1BBCDC,
|
|
0xCA62C1D6
|
|
};
|
|
int t; // Loop counter
|
|
unsigned temp; // Temporary word value
|
|
unsigned W[80]; // Word sequence
|
|
unsigned A, B, C, D, E; // Word buffers
|
|
|
|
// Initialize the first 16 words in the array W
|
|
for(t = 0; t < 16; t++) {
|
|
W[t] = ((unsigned) context->Message_Block[t * 4]) << 24;
|
|
W[t] |= ((unsigned) context->Message_Block[t * 4 + 1]) << 16;
|
|
W[t] |= ((unsigned) context->Message_Block[t * 4 + 2]) << 8;
|
|
W[t] |= ((unsigned) 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->Message_Digest[0];
|
|
B = context->Message_Digest[1];
|
|
C = context->Message_Digest[2];
|
|
D = context->Message_Digest[3];
|
|
E = context->Message_Digest[4];
|
|
|
|
for(t = 0; t < 20; t++) {
|
|
temp = SHA1CircularShift(5,A) +
|
|
((B & C) | ((~B) & D)) + E + W[t] + K[0];
|
|
temp &= 0xFFFFFFFF;
|
|
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];
|
|
temp &= 0xFFFFFFFF;
|
|
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];
|
|
temp &= 0xFFFFFFFF;
|
|
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];
|
|
temp &= 0xFFFFFFFF;
|
|
E = D;
|
|
D = C;
|
|
C = SHA1CircularShift(30,B);
|
|
B = A;
|
|
A = temp;
|
|
}
|
|
|
|
context->Message_Digest[0] = (context->Message_Digest[0] + A) & 0xFFFFFFFF;
|
|
context->Message_Digest[1] = (context->Message_Digest[1] + B) & 0xFFFFFFFF;
|
|
context->Message_Digest[2] = (context->Message_Digest[2] + C) & 0xFFFFFFFF;
|
|
context->Message_Digest[3] = (context->Message_Digest[3] + D) & 0xFFFFFFFF;
|
|
context->Message_Digest[4] = (context->Message_Digest[4] + E) & 0xFFFFFFFF;
|
|
|
|
context->Message_Block_Index = 0;
|
|
}
|
|
|
|
// 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 SHA1ProcessMessageBlock() appropriately. When it returns, it
|
|
// can be assumed that the message digest has been computed.
|
|
static 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] = (context->Length_High >> 24) & 0xFF;
|
|
context->Message_Block[57] = (context->Length_High >> 16) & 0xFF;
|
|
context->Message_Block[58] = (context->Length_High >> 8) & 0xFF;
|
|
context->Message_Block[59] = (context->Length_High) & 0xFF;
|
|
context->Message_Block[60] = (context->Length_Low >> 24) & 0xFF;
|
|
context->Message_Block[61] = (context->Length_Low >> 16) & 0xFF;
|
|
context->Message_Block[62] = (context->Length_Low >> 8) & 0xFF;
|
|
context->Message_Block[63] = (context->Length_Low) & 0xFF;
|
|
|
|
SHA1ProcessMessageBlock(context);
|
|
}
|
|
|
|
|
|
void SHA1_Hash_Portable(const char* data, size_t len, char* hash_array) {
|
|
SHA1Context context;
|
|
SHA1Reset(&context);
|
|
SHA1Input(&context, reinterpret_cast<const unsigned char*>(data), len);
|
|
bool ok = SHA1Result(&context);
|
|
if (!ok) {
|
|
fprintf(stderr, "Unexpected error in SHA1_Hash_Portable code\n");
|
|
exit(1);
|
|
}
|
|
for (int i = 0; i < 5; i++) {
|
|
uint32_t value = context.Message_Digest[i];
|
|
hash_array[i*4 + 0] = (value >> 24) & 0xff;
|
|
hash_array[i*4 + 1] = (value >> 16) & 0xff;
|
|
hash_array[i*4 + 2] = (value >> 8) & 0xff;
|
|
hash_array[i*4 + 3] = value & 0xff;
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|
|
|