sha1.cc

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/*
 * Copyright (C) 2010 nobody (this is public domain)
 */

/*
 * SHA-1 in C
 * 
 * This file is based on public domain code.
 * Initial source code is in the public domain, 
 * so clarified by Steve Reid <steve@edmweb.com>
 *
 * Test Vectors (from FIPS PUB 180-1)
 * "abc"
 *   A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
 * "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
 *   84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
 * A million repetitions of "a"
 *   34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
 */

#include <config.h>
#include "sha1.h"
#include <string.h>

namespace drizzled {

#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))

/* Solaris + gcc don't always define this. */
#ifndef BYTE_ORDER
# define LITTLE_ENDIAN 1234
# define BIG_ENDIAN 4321
# if defined(sparc) || defined(__sparc) || defined(__sparc__)
#  define BYTE_ORDER BIG_ENDIAN
# else
#  define BYTE_ORDER LITTLE_ENDIAN
# endif
#endif /* BYTE_ORDER */

/*
 * blk0() and blk() perform the initial expand.
 * I got the idea of expanding during the round function from SSLeay
 */
#if BYTE_ORDER == LITTLE_ENDIAN
# define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
    |(rol(block->l[i],8)&0x00FF00FF))
#else
# define blk0(i) block->l[i]
#endif
#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
    ^block->l[(i+2)&15]^block->l[i&15],1))

/*
 * (R0+R1), R2, R3, R4 are the different operations (rounds) used in SHA1
 */
#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);

/*
 * Hash a single 512-bit block. This is the core of the algorithm.
 */
void
SHA1Transform(uint32_t state[5], const uint8_t buffer[SHA1_BLOCK_LENGTH])
{
  uint32_t a, b, c, d, e;
  typedef union {
    uint8_t c[64];
    uint32_t l[16];
  } CHAR64LONG16;
  CHAR64LONG16 realBlock;
  CHAR64LONG16 *block= &realBlock;

  (void)memcpy(block, buffer, SHA1_BLOCK_LENGTH);

  /* Copy context->state[] to working vars */
  a = state[0];
  b = state[1];
  c = state[2];
  d = state[3];
  e = state[4];

  /* 4 rounds of 20 operations each. Loop unrolled. */
  R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
  R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
  R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
  R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
  R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
  R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
  R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
  R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
  R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
  R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
  R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
  R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
  R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
  R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
  R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
  R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
  R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
  R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
  R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
  R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);

  /* Add the working vars back into context.state[] */
  state[0] += a;
  state[1] += b;
  state[2] += c;
  state[3] += d;
  state[4] += e;

  /* Wipe variables */
  a = b = c = d = e = 0;
}


/*
 * SHA1Init - Initialize new context
 */
void
SHA1Init(SHA1_CTX *context)
{

  /* SHA1 initialization constants */
  context->count = 0;
  context->state[0] = 0x67452301;
  context->state[1] = 0xEFCDAB89;
  context->state[2] = 0x98BADCFE;
  context->state[3] = 0x10325476;
  context->state[4] = 0xC3D2E1F0;
}


/*
 * Run your data through this.
 */
void
SHA1Update(SHA1_CTX *context, const uint8_t *data, size_t len)
{
  size_t i, j;

  j = (size_t)((context->count >> 3) & 63);
  context->count += (len << 3);
  if ((j + len) > 63) {
    (void)memcpy(&context->buffer[j], data, (i = 64-j));
    SHA1Transform(context->state, context->buffer);
    for ( ; i + 63 < len; i += 64)
      SHA1Transform(context->state, (uint8_t *)&data[i]);
    j = 0;
  } else {
    i = 0;
  }
  (void)memcpy(&context->buffer[j], &data[i], len - i);
}


/*
 * Add padding and return the message digest.
 */
void
SHA1Pad(SHA1_CTX *context)
{
  uint8_t finalcount[8];
  u_int i;

  for (i = 0; i < 8; i++) {
    finalcount[i] = (uint8_t)((context->count >>
        ((7 - (i & 7)) * 8)) & 255);  /* Endian independent */
  }
  SHA1Update(context, (uint8_t *)"\200", 1);
  while ((context->count & 504) != 448)
    SHA1Update(context, (uint8_t *)"\0", 1);
  SHA1Update(context, finalcount, 8); /* Should cause a SHA1Transform() */
}

void
SHA1Final(uint8_t digest[SHA1_DIGEST_LENGTH], SHA1_CTX *context)
{
  u_int i;

  SHA1Pad(context);
  if (digest) {
    for (i = 0; i < SHA1_DIGEST_LENGTH; i++) {
      digest[i] = (uint8_t)
         ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
    }
    memset(context, 0, sizeof(*context));
  }
}

void do_sha1(data_ref in, uint8_t out[SHA1_DIGEST_LENGTH])
{
  SHA1_CTX ctx;
  SHA1Init(&ctx);
  SHA1Update(&ctx, in.data(), in.size());
  SHA1Final(out, &ctx);
}

} /* namespace drizzled */