/*
sha1.cpp - source code of
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+
============
SHA-1 in C++
============
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+
100% Public Domain.
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+
Original C Code
-- Steve Reid <steve@edmweb.com>
Small changes to fit into bglibs
-- Bruce Guenter <bruce@untroubled.org>
Translation to simpler C++ Code
-- Volker Grabsch <vog@notjusthosting.com>
+ Fixing bugs and improving style
+ -- Eugene Hopkinson <slowriot at voxelstorm dot com>
*/
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+
#include "sha1.h"
#include <sstream>
#include <iomanip>
#include <fstream>
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/* Help macros */
#define SHA1_ROL(value, bits) (((value) << (bits)) | (((value) & 0xffffffff) >> (32 - (bits))))
#define SHA1_BLK(i) (block[i&15] = SHA1_ROL(block[(i+13)&15] ^ block[(i+8)&15] ^ block[(i+2)&15] ^ block[i&15],1))
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/* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
#define SHA1_R0(v,w,x,y,z,i) z += ((w&(x^y))^y) + block[i] + 0x5a827999 + SHA1_ROL(v,5); w=SHA1_ROL(w,30);
#define SHA1_R1(v,w,x,y,z,i) z += ((w&(x^y))^y) + SHA1_BLK(i) + 0x5a827999 + SHA1_ROL(v,5); w=SHA1_ROL(w,30);
#define SHA1_R2(v,w,x,y,z,i) z += (w^x^y) + SHA1_BLK(i) + 0x6ed9eba1 + SHA1_ROL(v,5); w=SHA1_ROL(w,30);
#define SHA1_R3(v,w,x,y,z,i) z += (((w|x)&y)|(w&x)) + SHA1_BLK(i) + 0x8f1bbcdc + SHA1_ROL(v,5); w=SHA1_ROL(w,30);
#define SHA1_R4(v,w,x,y,z,i) z += (w^x^y) + SHA1_BLK(i) + 0xca62c1d6 + SHA1_ROL(v,5); w=SHA1_ROL(w,30);
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SHA1::SHA1()
{
reset();
}
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void SHA1::update(const std::string &s)
{
std::istringstream is(s);
update(is);
}
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void SHA1::update(std::istream &is)
{
std::string rest_of_buffer;
read(is, rest_of_buffer, BLOCK_BYTES - buffer.size());
buffer += rest_of_buffer;
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while (is)
{
uint32 block[BLOCK_INTS];
read(is, buffer, BLOCK_BYTES);
}
}
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/*
* Add padding and return the message digest.
*/
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std::string SHA1::final()
{
/* Total number of hashed bits */
uint64 total_bits = (transforms*BLOCK_BYTES + buffer.size()) * 8;
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/* Padding */
buffer += 0x80;
unsigned int orig_size = buffer.size();
{
buffer += (char)0x00;
}
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uint32 block[BLOCK_INTS];
buffer_to_block(buffer, block);
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if (orig_size > BLOCK_BYTES - 8)
{
transform(block);
block[i] = 0;
}
}
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/* Append total_bits, split this uint64 into two uint32 */
block[BLOCK_INTS - 1] = total_bits;
block[BLOCK_INTS - 2] = (total_bits >> 32);
transform(block);
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/* Hex std::string */
std::ostringstream result;
for (unsigned int i = 0; i < DIGEST_INTS; i++)
result << std::hex << std::setfill('0') << std::setw(8);
result << (digest[i] & 0xffffffff);
}
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/* Reset for next run */
reset();
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return result.str();
}
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std::string SHA1::from_file(const std::string &filename)
{
std::ifstream stream(filename.c_str(), std::ios::binary);
checksum.update(stream);
return checksum.final();
}
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void SHA1::reset()
{
/* SHA1 initialization constants */
digest[2] = 0x98badcfe;
digest[3] = 0x10325476;
digest[4] = 0xc3d2e1f0;
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/* Reset counters */
transforms = 0;
buffer = "";
}
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/*
* Hash a single 512-bit block. This is the core of the algorithm.
*/
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void SHA1::transform(uint32 block[BLOCK_BYTES])
{
/* Copy digest[] to working vars */
uint32 c = digest[2];
uint32 d = digest[3];
uint32 e = digest[4];
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/* 4 rounds of 20 operations each. Loop unrolled. */
SHA1_R0(a,b,c,d,e, 0);
SHA1_R0(e,a,b,c,d, 1);
SHA1_R4(d,e,a,b,c,77);
SHA1_R4(c,d,e,a,b,78);
SHA1_R4(b,c,d,e,a,79);
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/* Add the working vars back into digest[] */
digest[0] += a;
digest[1] += b;
digest[2] += c;
digest[3] += d;
digest[4] += e;
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/* Count the number of transformations */
transforms++;
}
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-void SHA1::buffer_to_block(const std::string &buffer, uint32 block[BLOCK_BYTES])
+
+
+void SHA1::buffer_to_block(const std::string &buffer, uint32 block[BLOCK_INTS])
{
/* Convert the std::string (byte buffer) to a uint32 array (MSB) */
for (unsigned int i = 0; i < BLOCK_INTS; i++)
| (buffer[4*i+0] & 0xff)<<24;
}
}
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-void SHA1::read(std::istream &is, std::string &s, int max)
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+
+void SHA1::read(std::istream &is, std::string &s, size_t max)
{
char* sbuf = new char[max];
delete[] sbuf;
}
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+
+
std::string sha1(const std::string &string)
{
SHA1 checksum;
/*
sha1.h - header of
-
+
============
SHA-1 in C++
============
-
+
100% Public Domain.
-
+
Original C Code
-- Steve Reid <steve@edmweb.com>
Small changes to fit into bglibs
-- Bruce Guenter <bruce@untroubled.org>
Translation to simpler C++ Code
-- Volker Grabsch <vog@notjusthosting.com>
+ Fixing bugs and improving style
+ -- Eugene Hopkinson <slowriot at voxelstorm dot com>
*/
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+
#ifndef SHA1_HPP
#define SHA1_HPP
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+
+
#include <iostream>
#include <string>
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+
class SHA1
{
public:
void update(std::istream &is);
std::string final();
static std::string from_file(const std::string &filename);
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+
private:
typedef unsigned long int uint32; /* just needs to be at least 32bit */
typedef unsigned long long uint64; /* just needs to be at least 64bit */
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static const unsigned int DIGEST_INTS = 5; /* number of 32bit integers per SHA1 digest */
static const unsigned int BLOCK_INTS = 16; /* number of 32bit integers per SHA1 block */
static const unsigned int BLOCK_BYTES = BLOCK_INTS * 4;
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uint32 digest[DIGEST_INTS];
std::string buffer;
uint64 transforms;
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void reset();
void transform(uint32 block[BLOCK_BYTES]);
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- static void buffer_to_block(const std::string &buffer, uint32 block[BLOCK_BYTES]);
- static void read(std::istream &is, std::string &s, int max);
+
+ static void read(std::istream &is, std::string &s, size_t max);
+ static void buffer_to_block(const std::string &buffer, uint32 block[BLOCK_INTS]);
};
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std::string sha1(const std::string &string);
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+
+
#endif /* SHA1_HPP */
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