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Sourcecode: heartbeat version File versions

md5.c

/* $Id: md5.c,v 1.9.2.1 2004/04/20 09:08:50 lars Exp $ */
/*
 * This code implements the MD5 message-digest algorithm.
 * The algorithm is due to Ron Rivest.  This code was
 * written by Colin Plumb in 1993, no copyright is claimed.
 * This code is in the public domain; do with it what you wish.
 *
 * Equivalent code is available from RSA Data Security, Inc.
 * This code has been tested against that, and is equivalent,
 * except that you don't need to include two pages of legalese
 * with every copy.
 *
 * To compute the message digest of a chunk of bytes, declare an
 * MD5Context structure, pass it to MD5Init, call MD5Update as
 * needed on buffers full of bytes, and then call MD5Final, which
 * will fill a supplied 16-byte array with the digest.
 *
 * Cleaned up by Mitja Sarp <mitja@lysator.liu.se> for heartbeat
 *
 */

#include <portability.h>
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#include <stdio.h>            /* for sprintf() */
#include <string.h>           /* for memcpy() */
#include <sys/types.h>        /* for stupid systems */
#include <netinet/in.h>       /* for ntohl() */
#include <HBauth.h>

#define PIL_PLUGINTYPE        HB_AUTH_TYPE
#define PIL_PLUGIN            md5
#define PIL_PLUGINTYPE_S      "HBauth"
#define PIL_PLUGIN_S          "md5"
#define PIL_PLUGINLICENSE     LICENSE_PUBDOM
#define PIL_PLUGINLICENSEURL  URL_PUBDOM
#include <pils/plugin.h>


/* The Ops we export to the world... */
static int md5_auth_calc(const struct HBauth_info *t
,     const void * text, size_t textlen ,char * result, int resultlen);

static int md5_auth_needskey(void);

/* Authentication plugin operations */
static struct HBAuthOps md5ops =
{     md5_auth_calc
,     md5_auth_needskey
};

/*
 * The following two functions are only exported to the plugin infrastructure.
 */

/*
 * md5close is called as part of shutting down the md5 HBauth plugin.
 * If there was any global data allocated, or file descriptors opened, etc.
 * which is associated with the plugin, and not a single interface
 * in particular, here's our chance to clean it up.
 */
static void md5closepi(PILPlugin* pi)
{
}

/*
 * md5closeintf called as part of shutting down the md5 HBauth interface.
 * If there was any global data allocated, or file descriptors opened, etc.
 * which is associated with the md5 implementation, here's our chance
 * to clean it up.
 */
static PIL_rc md5closeintf(PILInterface* pi, void* pd)
{
      return PIL_OK;
}

PIL_PLUGIN_BOILERPLATE("1.0", Debug, md5closepi);

static const PILPluginImports*  PluginImports;
static PILPlugin*               OurPlugin;
static PILInterface*          OurInterface;
static void*                  OurImports;
static void*                  interfprivate;

/*
 *
 * Our plugin initialization and registration function
 * It gets called when the plugin gets loaded.
 */
PIL_rc
PIL_PLUGIN_INIT(PILPlugin*us, const PILPluginImports* imports);

PIL_rc
PIL_PLUGIN_INIT(PILPlugin*us, const PILPluginImports* imports)
{
      /* Force the compiler to do a little type checking */
      (void)(PILPluginInitFun)PIL_PLUGIN_INIT;

      PluginImports = imports;
      OurPlugin = us;

      /* Register ourself as a plugin */
      imports->register_plugin(us, &OurPIExports);  

      /*  Register our interfaces */
      return imports->register_interface(us, PIL_PLUGINTYPE_S,  PIL_PLUGIN_S
      ,     &md5ops
      ,     md5closeintf            /*close */
      ,     &OurInterface
      ,     &OurImports
      ,     interfprivate); 
}

/*
 *    Real work starts here ;-)
 */

#define MD5_DIGESTSIZE  16
#define MD5_BLOCKSIZE   64

typedef struct MD5Context_st {
      uint32_t buf[4];
      uint32_t bytes[2];
      uint32_t in[16];
}MD5Context;

#define md5byte unsigned char

struct MD5Context {
      uint32_t buf[4];
      uint32_t bytes[2];
      uint32_t in[16];
};

static void MD5Init(MD5Context *context);
static void MD5Update(MD5Context *context, md5byte const *buf, unsigned len);
static void MD5Final(unsigned char digest[16], MD5Context *context);
static void MD5Transform(uint32_t buf[4], uint32_t const in[16]);

static int
md5_auth_needskey(void) 
{ 
      return 1;   /* Yes, we require (need) a key */
}


#define byteSwap(buf,words)

/*
 * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
 * initialization constants.
 */
static void
MD5Init(MD5Context *ctx)
{
      ctx->buf[0] = 0x67452301ul;
      ctx->buf[1] = 0xefcdab89ul;
      ctx->buf[2] = 0x98badcfeul;
      ctx->buf[3] = 0x10325476ul;

      ctx->bytes[0] = 0;
      ctx->bytes[1] = 0;
}

/*
 * Update context to reflect the concatenation of another buffer full
 * of bytes.
 */
static void
MD5Update(MD5Context *ctx, md5byte const *buf, unsigned len)
{
      uint32_t t;

      /* Update byte count */

      t = ctx->bytes[0];
      if ((ctx->bytes[0] = t + len) < t)
            ctx->bytes[1]++;  /* Carry from low to high */

      t = 64 - (t & 0x3f);    /* Space available in ctx->in (at least 1) */
      if (t > len) {
            memcpy((md5byte *)ctx->in + 64 - t, buf, len);
            return;
      }
      /* First chunk is an odd size */
      memcpy((md5byte *)ctx->in + 64 - t, buf, t);
      byteSwap(ctx->in, 16);
      MD5Transform(ctx->buf, ctx->in);
      buf += t;
      len -= t;

      /* Process data in 64-byte chunks */
      while (len >= 64) {
            memcpy(ctx->in, buf, 64);
            byteSwap(ctx->in, 16);
            MD5Transform(ctx->buf, ctx->in);
            buf += 64;
            len -= 64;
      }

      /* Handle any remaining bytes of data. */
      memcpy(ctx->in, buf, len);
}

/*
 * Final wrapup - pad to 64-byte boundary with the bit pattern 
 * 1 0* (64-bit count of bits processed, MSB-first)
 */
static void
MD5Final(md5byte digest[16], MD5Context *ctx)
{
      int count = ctx->bytes[0] & 0x3f;   /* Number of bytes in ctx->in */
      md5byte *p = (md5byte *)ctx->in + count;

      /* Set the first char of padding to 0x80.  There is always room. */
      *p++ = 0x80;

      /* Bytes of padding needed to make 56 bytes (-8..55) */
      count = 56 - 1 - count;

      if (count < 0) {  /* Padding forces an extra block */
            memset(p, 0, count + 8);
            byteSwap(ctx->in, 16);
            MD5Transform(ctx->buf, ctx->in);
            p = (md5byte *)ctx->in;
            count = 56;
      }
      memset(p, 0, count);
      byteSwap(ctx->in, 14);

      /* Append length in bits and transform */
      ctx->in[14] = ctx->bytes[0] << 3;
      ctx->in[15] = ctx->bytes[1] << 3 | ctx->bytes[0] >> 29;
      MD5Transform(ctx->buf, ctx->in);

      byteSwap(ctx->buf, 4);
      memcpy(digest, ctx->buf, 16);
      memset(ctx, 0, sizeof(ctx));  /* In case it's sensitive */
}

/* The four core functions - F1 is optimized somewhat */

/* #define F1(x, y, z) (x & y | ~x & z) */
#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))

/* This is the central step in the MD5 algorithm. */
#define MD5STEP(f,w,x,y,z,in,s) \
       (w += f(x,y,z) + in, w = (w<<s | w>>(32-s)) + x)

/*
 * The core of the MD5 algorithm, this alters an existing MD5 hash to
 * reflect the addition of 16 longwords of new data.  MD5Update blocks
 * the data and converts bytes into longwords for this routine.
 */
static void
MD5Transform(uint32_t buf[4], uint32_t const in[16])
{
      register uint32_t a, b, c, d;

      a = buf[0];
      b = buf[1];
      c = buf[2];
      d = buf[3];

      MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478ul, 7);
      MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756ul, 12);
      MD5STEP(F1, c, d, a, b, in[2] + 0x242070dbul, 17);
      MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceeeul, 22);
      MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faful, 7);
      MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62aul, 12);
      MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613ul, 17);
      MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501ul, 22);
      MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8ul, 7);
      MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7aful, 12);
      MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1ul, 17);
      MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7beul, 22);
      MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122ul, 7);
      MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193ul, 12);
      MD5STEP(F1, c, d, a, b, in[14] + 0xa679438eul, 17);
      MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821ul, 22);

      MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562ul, 5);
      MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340ul, 9);
      MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51ul, 14);
      MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aaul, 20);
      MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105dul, 5);
      MD5STEP(F2, d, a, b, c, in[10] + 0x02441453ul, 9);
      MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681ul, 14);
      MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8ul, 20);
      MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6ul, 5);
      MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6ul, 9);
      MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87ul, 14);
      MD5STEP(F2, b, c, d, a, in[8] + 0x455a14edul, 20);
      MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905ul, 5);
      MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8ul, 9);
      MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9ul, 14);
      MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8aul, 20);

      MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942ul, 4);
      MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681ul, 11);
      MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122ul, 16);
      MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380cul, 23);
      MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44ul, 4);
      MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9ul, 11);
      MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60ul, 16);
      MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70ul, 23);
      MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6ul, 4);
      MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127faul, 11);
      MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085ul, 16);
      MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05ul, 23);
      MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039ul, 4);
      MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5ul, 11);
      MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8ul, 16);
      MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665ul, 23);

      MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244ul, 6);
      MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97ul, 10);
      MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7ul, 15);
      MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039ul, 21);
      MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3ul, 6);
      MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92ul, 10);
      MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47dul, 15);
      MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1ul, 21);
      MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4ful, 6);
      MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0ul, 10);
      MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314ul, 15);
      MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1ul, 21);
      MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82ul, 6);
      MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235ul, 10);
      MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bbul, 15);
      MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391ul, 21);

      buf[0] += a;
      buf[1] += b;
      buf[2] += c;
      buf[3] += d;
}

static int
md5_auth_calc(const struct HBauth_info *t, const void * text
,     size_t textlen, char * result, int resultlen)
{

      MD5Context context;
      unsigned char digest[MD5_DIGESTSIZE];
      const char * key = t->key;
      /* inner padding - key XORd with ipad */
      unsigned char k_ipad[65];    
      /* outer padding - * key XORd with opad */
      unsigned char k_opad[65];    
      unsigned char tk[MD5_DIGESTSIZE];
      int i, key_len;


      if (resultlen <= (MD5_DIGESTSIZE+1) *2) {
            return 0;
      }
      key_len = strlen(key);
      
      /* if key is longer than MD5_BLOCKSIZE bytes reset it to key=MD5(key) */
      if (key_len > MD5_BLOCKSIZE) { 
            MD5Context      tctx;   
            MD5Init(&tctx);
            MD5Update(&tctx, key, key_len);
            MD5Final(tk, &tctx); 

            key = tk;
            key_len = MD5_DIGESTSIZE;
      }       
      /* start out by storing key in pads */
      memset(k_ipad, 0, sizeof k_ipad);
      memset(k_opad, 0, sizeof k_opad);
      memcpy(k_ipad, key, key_len);
      memcpy(k_opad, key, key_len);

      /* XOR key with ipad and opad values */
      for (i=0; i<MD5_BLOCKSIZE; i++) {
            k_ipad[i] ^= 0x36;
            k_opad[i] ^= 0x5c;
      }       
      /* perform inner MD5 */
      MD5Init(&context);                   /* init context for 1st pass */
      MD5Update(&context, k_ipad, MD5_BLOCKSIZE);     /* start with inner pad */
      MD5Update(&context, text, textlen); /* then text of datagram */
      MD5Final(digest, &context);          /* finish up 1st pass */
      /* perform outer MD5 */
      MD5Init(&context);                   /* init context for 2nd pass */
      MD5Update(&context, k_opad, MD5_BLOCKSIZE);     /* start with outer pad */
      MD5Update(&context, digest, MD5_DIGESTSIZE);     /* then results of 1st hash */

      MD5Final(digest, &context);          /* finish up 2nd pass */

      /* And show the result in human-readable form */
      for (i = 0; i < MD5_DIGESTSIZE; i++) {
            sprintf(result, "%02x", digest[i]);
            result +=2;
      }
      return 1;
}

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