md5.c File Reference

#include "md5.h"
#include <string.h>

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Macros
#define	F1(x, y, z)   (z ^ (x & (y ^ z)))
#define	F2(x, y, z)   F1 (z, x, y)
#define	F3(x, y, z)   (x ^ y ^ z)
#define	F4(x, y, z)   (y ^ (x | ~z))
#define	MD5STEP(f, w, x, y, z, data, s)    (w += f (x, y, z) + data, w = w << s | w >> (32 - s), w += x)

Functions
static void	MD5Transform (uint32 buf[4], uint32 const in[16])
static void	byteReverse (unsigned char *buf, unsigned longs)
void	MD5Init (struct MD5Context *ctx)
void	MD5Update (struct MD5Context *ctx, unsigned char const *buf, unsigned len)
void	MD5Final (unsigned char digest[16], struct MD5Context *ctx)

Macro Definition Documentation

F1

#define F1	(		x,
			y,
			z
	)		(z ^ (x & (y ^ z)))

Definition at line 170 of file md5.c.

F2

#define F2	(		x,
			y,
			z
	)		F1 (z, x, y)

Definition at line 171 of file md5.c.

F3

#define F3	(		x,
			y,
			z
	)		(x ^ y ^ z)

Definition at line 172 of file md5.c.

F4

#define F4	(		x,
			y,
			z
	)		(y ^ (x | ~z))

Definition at line 173 of file md5.c.

MD5STEP

#define MD5STEP	(		f,
			w,
			x,
			y,
			z,
			data,
			s
	)		(w += f (x, y, z) + data, w = w << s | w >> (32 - s), w += x)

Definition at line 176 of file md5.c.

Function Documentation

byteReverse()

static void byteReverse ( unsigned char *  buf, unsigned  longs  )

static

Definition at line 37 of file md5.c.

{
  uint32 t;
  do
    {
      t = (uint32) ((unsigned) buf[3] << 8 | buf[2]) << 16
          | ((unsigned) buf[1] << 8 | buf[0]);
      *(uint32 *) buf = t;
      buf += 4;
    }
  while (--longs);
}

References uint32.

Referenced by MD5Final(), and MD5Update().

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MD5Final()

void MD5Final	(	unsigned char	digest[16],
		struct MD5Context *	ctx
	)

Definition at line 123 of file md5.c.

{
  unsigned int count;
  unsigned char *p;
 
  /* Compute number of bytes mod 64 */
  count = (ctx->bits[0] >> 3) & 0x3F;
 
  /* Set the first char of padding to 0x80.  This is safe since there is
     always at least one byte free */
  p = ctx->in + count;
  *p++ = 0x80;
 
  /* Bytes of padding needed to make 64 bytes */
  count = 64 - 1 - count;
 
  /* Pad out to 56 mod 64 */
  if (count < 8)
    {
      /* Two lots of padding:  Pad the first block to 64 bytes */
      memset (p, 0, count);
      byteReverse (ctx->in, 16);
      MD5Transform (ctx->buf, (uint32 *) ctx->in);
 
      /* Now fill the next block with 56 bytes */
      memset (ctx->in, 0, 56);
    }
  else
    {
      /* Pad block to 56 bytes */
      memset (p, 0, count - 8);
    }
  byteReverse (ctx->in, 14);
 
  /* Append length in bits and transform */
  ((uint32 *) ctx->in)[14] = ctx->bits[0];
  ((uint32 *) ctx->in)[15] = ctx->bits[1];
 
  MD5Transform (ctx->buf, (uint32 *) ctx->in);
  byteReverse ((unsigned char *) ctx->buf, 4);
  memmove (digest, ctx->buf, 16);
  memset (ctx, 0, sizeof (*ctx)); /* In case it's sensitive */
}

References MD5Context::bits, MD5Context::buf, byteReverse(), MD5Context::in, MD5Transform(), and uint32.

Referenced by hmac_md5_final(), ntlmssp_genauth_ntlm2(), and simple_packet_signature_ntlmssp().

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MD5Init()

void MD5Init

(

struct MD5Context *

ctx

)

Definition at line 55 of file md5.c.

{
  ctx->buf[0] = 0x67452301;
  ctx->buf[1] = 0xefcdab89;
  ctx->buf[2] = 0x98badcfe;
  ctx->buf[3] = 0x10325476;
 
  ctx->bits[0] = 0;
  ctx->bits[1] = 0;
}

References MD5Context::bits, and MD5Context::buf.

Referenced by hmac_md5_final(), hmac_md5_init_limK_to_64(), ntlmssp_genauth_ntlm2(), and simple_packet_signature_ntlmssp().

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MD5Transform()

static void MD5Transform ( uint32  buf[4], uint32 const  in[16]  )

static

Definition at line 185 of file md5.c.

{
  register uint32 a, b, c, d;
 
  a = buf[0];
  b = buf[1];
  c = buf[2];
  d = buf[3];
 
  MD5STEP (F1, a, b, c, d, in[0] + 0xd76aa478, 7);
  MD5STEP (F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
  MD5STEP (F1, c, d, a, b, in[2] + 0x242070db, 17);
  MD5STEP (F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
  MD5STEP (F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
  MD5STEP (F1, d, a, b, c, in[5] + 0x4787c62a, 12);
  MD5STEP (F1, c, d, a, b, in[6] + 0xa8304613, 17);
  MD5STEP (F1, b, c, d, a, in[7] + 0xfd469501, 22);
  MD5STEP (F1, a, b, c, d, in[8] + 0x698098d8, 7);
  MD5STEP (F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
  MD5STEP (F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
  MD5STEP (F1, b, c, d, a, in[11] + 0x895cd7be, 22);
  MD5STEP (F1, a, b, c, d, in[12] + 0x6b901122, 7);
  MD5STEP (F1, d, a, b, c, in[13] + 0xfd987193, 12);
  MD5STEP (F1, c, d, a, b, in[14] + 0xa679438e, 17);
  MD5STEP (F1, b, c, d, a, in[15] + 0x49b40821, 22);
 
  MD5STEP (F2, a, b, c, d, in[1] + 0xf61e2562, 5);
  MD5STEP (F2, d, a, b, c, in[6] + 0xc040b340, 9);
  MD5STEP (F2, c, d, a, b, in[11] + 0x265e5a51, 14);
  MD5STEP (F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
  MD5STEP (F2, a, b, c, d, in[5] + 0xd62f105d, 5);
  MD5STEP (F2, d, a, b, c, in[10] + 0x02441453, 9);
  MD5STEP (F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
  MD5STEP (F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
  MD5STEP (F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
  MD5STEP (F2, d, a, b, c, in[14] + 0xc33707d6, 9);
  MD5STEP (F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
  MD5STEP (F2, b, c, d, a, in[8] + 0x455a14ed, 20);
  MD5STEP (F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
  MD5STEP (F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
  MD5STEP (F2, c, d, a, b, in[7] + 0x676f02d9, 14);
  MD5STEP (F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
 
  MD5STEP (F3, a, b, c, d, in[5] + 0xfffa3942, 4);
  MD5STEP (F3, d, a, b, c, in[8] + 0x8771f681, 11);
  MD5STEP (F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
  MD5STEP (F3, b, c, d, a, in[14] + 0xfde5380c, 23);
  MD5STEP (F3, a, b, c, d, in[1] + 0xa4beea44, 4);
  MD5STEP (F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
  MD5STEP (F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
  MD5STEP (F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
  MD5STEP (F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
  MD5STEP (F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
  MD5STEP (F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
  MD5STEP (F3, b, c, d, a, in[6] + 0x04881d05, 23);
  MD5STEP (F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
  MD5STEP (F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
  MD5STEP (F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
  MD5STEP (F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
 
  MD5STEP (F4, a, b, c, d, in[0] + 0xf4292244, 6);
  MD5STEP (F4, d, a, b, c, in[7] + 0x432aff97, 10);
  MD5STEP (F4, c, d, a, b, in[14] + 0xab9423a7, 15);
  MD5STEP (F4, b, c, d, a, in[5] + 0xfc93a039, 21);
  MD5STEP (F4, a, b, c, d, in[12] + 0x655b59c3, 6);
  MD5STEP (F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
  MD5STEP (F4, c, d, a, b, in[10] + 0xffeff47d, 15);
  MD5STEP (F4, b, c, d, a, in[1] + 0x85845dd1, 21);
  MD5STEP (F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
  MD5STEP (F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
  MD5STEP (F4, c, d, a, b, in[6] + 0xa3014314, 15);
  MD5STEP (F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
  MD5STEP (F4, a, b, c, d, in[4] + 0xf7537e82, 6);
  MD5STEP (F4, d, a, b, c, in[11] + 0xbd3af235, 10);
  MD5STEP (F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
  MD5STEP (F4, b, c, d, a, in[9] + 0xeb86d391, 21);
 
  buf[0] += a;
  buf[1] += b;
  buf[2] += c;
  buf[3] += d;
}

References F1, F2, F3, F4, MD5STEP, and uint32.

Referenced by MD5Final(), and MD5Update().

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MD5Update()

void MD5Update	(	struct MD5Context *	ctx,
		unsigned char const *	buf,
		unsigned	len
	)

Definition at line 71 of file md5.c.

{
  register uint32 t;
 
  /* Update bitcount */
 
  t = ctx->bits[0];
  if ((ctx->bits[0] = t + ((uint32) len << 3)) < t)
    ctx->bits[1]++; /* Carry from low to high */
  ctx->bits[1] += len >> 29;
 
  t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
 
  /* Handle any leading odd-sized chunks */
 
  if (t)
    {
      unsigned char *p = (unsigned char *) ctx->in + t;
 
      t = 64 - t;
      if (len < t)
        {
          memmove (p, buf, len);
          return;
        }
      memmove (p, buf, t);
      byteReverse (ctx->in, 16);
      MD5Transform (ctx->buf, (uint32 *) ctx->in);
      buf += t;
      len -= t;
    }
  /* Process data in 64-byte chunks */
 
  while (len >= 64)
    {
      memmove (ctx->in, buf, 64);
      byteReverse (ctx->in, 16);
      MD5Transform (ctx->buf, (uint32 *) ctx->in);
      buf += 64;
      len -= 64;
    }
 
  /* Handle any remaining bytes of data. */
 
  memmove (ctx->in, buf, len);
}

References MD5Context::bits, MD5Context::buf, byteReverse(), MD5Context::in, len, MD5Transform(), and uint32.

Referenced by hmac_md5_final(), hmac_md5_init_limK_to_64(), hmac_md5_update(), ntlmssp_genauth_ntlm2(), and simple_packet_signature_ntlmssp().

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