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Classes | Defines | Functions
sha1.h File Reference
#include <stdio.h>
#include <stdint.h>
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Classes

struct  sha1_ctx

Defines

#define SHA1_DIGEST_SIZE   20

Functions

void sha1_init_ctx (struct sha1_ctx *ctx)
void sha1_process_block (const void *buffer, size_t len, struct sha1_ctx *ctx)
void sha1_process_bytes (const void *buffer, size_t len, struct sha1_ctx *ctx)
void * sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf)
void * sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf)
int sha1_stream (FILE *stream, void *resblock)
void * sha1_buffer (const char *buffer, size_t len, void *resblock)

Class Documentation

struct sha1_ctx

Definition at line 33 of file sha1.h.

Class Members
uint32_t A
uint32_t B
uint32_t buffer
uint32_t buflen
uint32_t C
uint32_t D
uint32_t E
uint32_t total

Define Documentation

#define SHA1_DIGEST_SIZE   20

Definition at line 30 of file sha1.h.


Function Documentation

void* sha1_buffer ( const char *  buffer,
size_t  len,
void *  resblock 
)

Definition at line 199 of file sha1.c.

{
  struct sha1_ctx ctx;

  /* Initialize the computation context.  */
  sha1_init_ctx (&ctx);

  /* Process whole buffer but last len % 64 bytes.  */
  sha1_process_bytes (buffer, len, &ctx);

  /* Put result in desired memory area.  */
  return sha1_finish_ctx (&ctx, resblock);
}

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void* sha1_finish_ctx ( struct sha1_ctx ctx,
void *  resbuf 
)

Definition at line 98 of file sha1.c.

{
  /* Take yet unprocessed bytes into account.  */
  uint32_t bytes = ctx->buflen;
  size_t size = (bytes < 56) ? 64 / 4 : 64 * 2 / 4;

  /* Now count remaining bytes.  */
  ctx->total[0] += bytes;
  if (ctx->total[0] < bytes)
    ++ctx->total[1];

  /* Put the 64-bit file length in *bits* at the end of the buffer.  */
  ctx->buffer[size - 2] = SWAP ((ctx->total[1] << 3) | (ctx->total[0] >> 29));
  ctx->buffer[size - 1] = SWAP (ctx->total[0] << 3);

  memcpy (&((char *) ctx->buffer)[bytes], fillbuf, (size - 2) * 4 - bytes);

  /* Process last bytes.  */
  sha1_process_block (ctx->buffer, size * 4, ctx);

  return sha1_read_ctx (ctx, resbuf);
}

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void sha1_init_ctx ( struct sha1_ctx ctx)

Definition at line 59 of file sha1.c.

{
  ctx->A = 0x67452301;
  ctx->B = 0xefcdab89;
  ctx->C = 0x98badcfe;
  ctx->D = 0x10325476;
  ctx->E = 0xc3d2e1f0;

  ctx->total[0] = ctx->total[1] = 0;
  ctx->buflen = 0;
}

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void sha1_process_block ( const void *  buffer,
size_t  len,
struct sha1_ctx ctx 
)

Definition at line 299 of file sha1.c.

{
  const uint32_t *words = buffer;
  size_t nwords = len / sizeof (uint32_t);
  const uint32_t *endp = words + nwords;
  uint32_t x[16];
  uint32_t a = ctx->A;
  uint32_t b = ctx->B;
  uint32_t c = ctx->C;
  uint32_t d = ctx->D;
  uint32_t e = ctx->E;

  /* First increment the byte count.  RFC 1321 specifies the possible
     length of the file up to 2^64 bits.  Here we only compute the
     number of bytes.  Do a double word increment.  */
  ctx->total[0] += len;
  if (ctx->total[0] < len)
    ++ctx->total[1];

#define rol(x, n) (((x) << (n)) | ((uint32_t) (x) >> (32 - (n))))

#define M(I) ( tm =   x[I&0x0f] ^ x[(I-14)&0x0f] \
                    ^ x[(I-8)&0x0f] ^ x[(I-3)&0x0f] \
               , (x[I&0x0f] = rol(tm, 1)) )

#define R(A,B,C,D,E,F,K,M)  do { E += rol( A, 5 )     \
                                      + F( B, C, D )  \
                                      + K             \
                                      + M;            \
                                 B = rol( B, 30 );    \
                               } while(0)

  while (words < endp)
    {
      uint32_t tm;
      int t;
      for (t = 0; t < 16; t++)
        {
          x[t] = SWAP (*words);
          words++;
        }

      R( a, b, c, d, e, F1, K1, x[ 0] );
      R( e, a, b, c, d, F1, K1, x[ 1] );
      R( d, e, a, b, c, F1, K1, x[ 2] );
      R( c, d, e, a, b, F1, K1, x[ 3] );
      R( b, c, d, e, a, F1, K1, x[ 4] );
      R( a, b, c, d, e, F1, K1, x[ 5] );
      R( e, a, b, c, d, F1, K1, x[ 6] );
      R( d, e, a, b, c, F1, K1, x[ 7] );
      R( c, d, e, a, b, F1, K1, x[ 8] );
      R( b, c, d, e, a, F1, K1, x[ 9] );
      R( a, b, c, d, e, F1, K1, x[10] );
      R( e, a, b, c, d, F1, K1, x[11] );
      R( d, e, a, b, c, F1, K1, x[12] );
      R( c, d, e, a, b, F1, K1, x[13] );
      R( b, c, d, e, a, F1, K1, x[14] );
      R( a, b, c, d, e, F1, K1, x[15] );
      R( e, a, b, c, d, F1, K1, M(16) );
      R( d, e, a, b, c, F1, K1, M(17) );
      R( c, d, e, a, b, F1, K1, M(18) );
      R( b, c, d, e, a, F1, K1, M(19) );
      R( a, b, c, d, e, F2, K2, M(20) );
      R( e, a, b, c, d, F2, K2, M(21) );
      R( d, e, a, b, c, F2, K2, M(22) );
      R( c, d, e, a, b, F2, K2, M(23) );
      R( b, c, d, e, a, F2, K2, M(24) );
      R( a, b, c, d, e, F2, K2, M(25) );
      R( e, a, b, c, d, F2, K2, M(26) );
      R( d, e, a, b, c, F2, K2, M(27) );
      R( c, d, e, a, b, F2, K2, M(28) );
      R( b, c, d, e, a, F2, K2, M(29) );
      R( a, b, c, d, e, F2, K2, M(30) );
      R( e, a, b, c, d, F2, K2, M(31) );
      R( d, e, a, b, c, F2, K2, M(32) );
      R( c, d, e, a, b, F2, K2, M(33) );
      R( b, c, d, e, a, F2, K2, M(34) );
      R( a, b, c, d, e, F2, K2, M(35) );
      R( e, a, b, c, d, F2, K2, M(36) );
      R( d, e, a, b, c, F2, K2, M(37) );
      R( c, d, e, a, b, F2, K2, M(38) );
      R( b, c, d, e, a, F2, K2, M(39) );
      R( a, b, c, d, e, F3, K3, M(40) );
      R( e, a, b, c, d, F3, K3, M(41) );
      R( d, e, a, b, c, F3, K3, M(42) );
      R( c, d, e, a, b, F3, K3, M(43) );
      R( b, c, d, e, a, F3, K3, M(44) );
      R( a, b, c, d, e, F3, K3, M(45) );
      R( e, a, b, c, d, F3, K3, M(46) );
      R( d, e, a, b, c, F3, K3, M(47) );
      R( c, d, e, a, b, F3, K3, M(48) );
      R( b, c, d, e, a, F3, K3, M(49) );
      R( a, b, c, d, e, F3, K3, M(50) );
      R( e, a, b, c, d, F3, K3, M(51) );
      R( d, e, a, b, c, F3, K3, M(52) );
      R( c, d, e, a, b, F3, K3, M(53) );
      R( b, c, d, e, a, F3, K3, M(54) );
      R( a, b, c, d, e, F3, K3, M(55) );
      R( e, a, b, c, d, F3, K3, M(56) );
      R( d, e, a, b, c, F3, K3, M(57) );
      R( c, d, e, a, b, F3, K3, M(58) );
      R( b, c, d, e, a, F3, K3, M(59) );
      R( a, b, c, d, e, F4, K4, M(60) );
      R( e, a, b, c, d, F4, K4, M(61) );
      R( d, e, a, b, c, F4, K4, M(62) );
      R( c, d, e, a, b, F4, K4, M(63) );
      R( b, c, d, e, a, F4, K4, M(64) );
      R( a, b, c, d, e, F4, K4, M(65) );
      R( e, a, b, c, d, F4, K4, M(66) );
      R( d, e, a, b, c, F4, K4, M(67) );
      R( c, d, e, a, b, F4, K4, M(68) );
      R( b, c, d, e, a, F4, K4, M(69) );
      R( a, b, c, d, e, F4, K4, M(70) );
      R( e, a, b, c, d, F4, K4, M(71) );
      R( d, e, a, b, c, F4, K4, M(72) );
      R( c, d, e, a, b, F4, K4, M(73) );
      R( b, c, d, e, a, F4, K4, M(74) );
      R( a, b, c, d, e, F4, K4, M(75) );
      R( e, a, b, c, d, F4, K4, M(76) );
      R( d, e, a, b, c, F4, K4, M(77) );
      R( c, d, e, a, b, F4, K4, M(78) );
      R( b, c, d, e, a, F4, K4, M(79) );

      a = ctx->A += a;
      b = ctx->B += b;
      c = ctx->C += c;
      d = ctx->D += d;
      e = ctx->E += e;
    }
}

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void sha1_process_bytes ( const void *  buffer,
size_t  len,
struct sha1_ctx ctx 
)

Definition at line 214 of file sha1.c.

{
  /* When we already have some bits in our internal buffer concatenate
     both inputs first.  */
  if (ctx->buflen != 0)
    {
      size_t left_over = ctx->buflen;
      size_t add = 128 - left_over > len ? len : 128 - left_over;

      memcpy (&((char *) ctx->buffer)[left_over], buffer, add);
      ctx->buflen += add;

      if (ctx->buflen > 64)
        {
          sha1_process_block (ctx->buffer, ctx->buflen & ~63, ctx);

          ctx->buflen &= 63;
          /* The regions in the following copy operation cannot overlap.  */
          memcpy (ctx->buffer,
                  &((char *) ctx->buffer)[(left_over + add) & ~63],
                  ctx->buflen);
        }

      buffer = (const char *) buffer + add;
      len -= add;
    }

  /* Process available complete blocks.  */
  if (len >= 64)
    {
#if !_STRING_ARCH_unaligned
# define alignof(type) offsetof (struct { char c; type x; }, x)
# define UNALIGNED_P(p) (((size_t) p) % alignof (uint32_t) != 0)
      if (UNALIGNED_P (buffer))
        while (len > 64)
          {
            sha1_process_block (memcpy (ctx->buffer, buffer, 64), 64, ctx);
            buffer = (const char *) buffer + 64;
            len -= 64;
          }
      else
#endif
        {
          sha1_process_block (buffer, len & ~63, ctx);
          buffer = (const char *) buffer + (len & ~63);
          len &= 63;
        }
    }

  /* Move remaining bytes in internal buffer.  */
  if (len > 0)
    {
      size_t left_over = ctx->buflen;

      memcpy (&((char *) ctx->buffer)[left_over], buffer, len);
      left_over += len;
      if (left_over >= 64)
        {
          sha1_process_block (ctx->buffer, 64, ctx);
          left_over -= 64;
          memcpy (ctx->buffer, &ctx->buffer[16], left_over);
        }
      ctx->buflen = left_over;
    }
}

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void* sha1_read_ctx ( const struct sha1_ctx ctx,
void *  resbuf 
)

Definition at line 83 of file sha1.c.

{
  char *r = resbuf;
  set_uint32 (r + 0 * sizeof ctx->A, SWAP (ctx->A));
  set_uint32 (r + 1 * sizeof ctx->B, SWAP (ctx->B));
  set_uint32 (r + 2 * sizeof ctx->C, SWAP (ctx->C));
  set_uint32 (r + 3 * sizeof ctx->D, SWAP (ctx->D));
  set_uint32 (r + 4 * sizeof ctx->E, SWAP (ctx->E));

  return resbuf;
}

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int sha1_stream ( FILE *  stream,
void *  resblock 
)

Definition at line 125 of file sha1.c.

{
  struct sha1_ctx ctx;
  size_t sum;

  char *buffer = malloc (BLOCKSIZE + 72);
  if (!buffer)
    return 1;

  /* Initialize the computation context.  */
  sha1_init_ctx (&ctx);

  /* Iterate over full file contents.  */
  while (1)
    {
      /* We read the file in blocks of BLOCKSIZE bytes.  One call of the
         computation function processes the whole buffer so that with the
         next round of the loop another block can be read.  */
      size_t n;
      sum = 0;

      /* Read block.  Take care for partial reads.  */
      while (1)
        {
          n = fread (buffer + sum, 1, BLOCKSIZE - sum, stream);

          sum += n;

          if (sum == BLOCKSIZE)
            break;

          if (n == 0)
            {
              /* Check for the error flag IFF N == 0, so that we don't
                 exit the loop after a partial read due to e.g., EAGAIN
                 or EWOULDBLOCK.  */
              if (ferror (stream))
                {
                  free (buffer);
                  return 1;
                }
              goto process_partial_block;
            }

          /* We've read at least one byte, so ignore errors.  But always
             check for EOF, since feof may be true even though N > 0.
             Otherwise, we could end up calling fread after EOF.  */
          if (feof (stream))
            goto process_partial_block;
        }

      /* Process buffer with BLOCKSIZE bytes.  Note that
                        BLOCKSIZE % 64 == 0
       */
      sha1_process_block (buffer, BLOCKSIZE, &ctx);
    }

 process_partial_block:;

  /* Process any remaining bytes.  */
  if (sum > 0)
    sha1_process_bytes (buffer, sum, &ctx);

  /* Construct result in desired memory.  */
  sha1_finish_ctx (&ctx, resblock);
  free (buffer);
  return 0;
}

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