app_md5.c

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//   account for the presence of each of the characters inBuf[0..inLen-1]
// in the message whose digest is being computed.


/*****************************************************************************
 * FUNCTION
 *  applib_md5_update
 * DESCRIPTION
 *  
 * PARAMETERS
 *  mdContext       [?]         
 *  inBuf           [IN]        
 *  inLen           [IN]        
 * RETURNS
 *  void
 *****************************************************************************/
void applib_md5_update(applib_md5_ctx *mdContext, const kal_uint8 *inBuf, kal_uint32 inLen)
{
    /*----------------------------------------------------------------*/
    /* Local Variables                                                */
    /*----------------------------------------------------------------*/
    kal_uint32 in[16];
    kal_int32 mdi;
    kal_uint32 i, ii;

    /*----------------------------------------------------------------*/
    /* Code Body                                                      */
    /*----------------------------------------------------------------*/
    /* compute number of bytes mod 64 */
    mdi = (kal_int32) ((mdContext->i[0] >> 3) & 0x3F);

    /* update number of bits */
    if ((mdContext->i[0] + ((kal_uint32) inLen << 3)) < mdContext->i[0])
    {
        mdContext->i[1]++;
    }
    mdContext->i[0] += ((kal_uint32) inLen << 3);
    mdContext->i[1] += ((kal_uint32) inLen >> 29);

    while (inLen--)
    {
        /* add new character to buffer, increment mdi */
        mdContext->in[mdi++] = *inBuf++;

        /* transform if necessary */
        if (mdi == 0x40)
        {
            for (i = 0, ii = 0; i < 16; i++, ii += 4)
            {
                in[i] = (((kal_uint32) mdContext->in[ii + 3]) << 24) |
                    (((kal_uint32) mdContext->in[ii + 2]) << 16) |
                    (((kal_uint32) mdContext->in[ii + 1]) << 8) | ((kal_uint32) mdContext->in[ii]);
            }
            Transform(mdContext->buf, in);
            mdi = 0;
        }
    }
}

// The routine MD5Final terminates the message-digest computation and
//   ends with the desired message digest in mdContext->digest[0...15].


/*****************************************************************************
 * FUNCTION
 *  applib_md5_final
 * DESCRIPTION
 *  
 * PARAMETERS
 *  hash            [?]     
 *  mdContext       [?]     
 * RETURNS
 *  void
 *****************************************************************************/
void applib_md5_final(kal_uint8 hash[], applib_md5_ctx *mdContext)
{
    /*----------------------------------------------------------------*/
    /* Local Variables                                                */
    /*----------------------------------------------------------------*/
    kal_uint32 in[16];
    kal_int32 mdi;
    kal_uint32 i, ii;
    kal_uint32 padLen;

    /*----------------------------------------------------------------*/
    /* Code Body                                                      */
    /*----------------------------------------------------------------*/
    /* save number of bits */
    in[14] = mdContext->i[0];
    in[15] = mdContext->i[1];

    /* compute number of bytes mod 64 */
    mdi = (kal_int32) ((mdContext->i[0] >> 3) & 0x3F);

    /* pad out to 56 mod 64 */
    padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
    applib_md5_update(mdContext, PADDING, padLen);

    /* append length in bits and transform */
    for (i = 0, ii = 0; i < 14; i++, ii += 4)
    {
        in[i] = (((kal_uint32) mdContext->in[ii + 3]) << 24) |
            (((kal_uint32) mdContext->in[ii + 2]) << 16) |
            (((kal_uint32) mdContext->in[ii + 1]) << 8) | ((kal_uint32) mdContext->in[ii]);
    }
    Transform(mdContext->buf, in);

    /* store buffer in digest */
    for (i = 0, ii = 0; i < 4; i++, ii += 4)
    {
        mdContext->digest[ii] = (kal_uint8) (mdContext->buf[i] & 0xFF);
        mdContext->digest[ii + 1] = (kal_uint8) ((mdContext->buf[i] >> 8) & 0xFF);
        mdContext->digest[ii + 2] = (kal_uint8) ((mdContext->buf[i] >> 16) & 0xFF);
        mdContext->digest[ii + 3] = (kal_uint8) ((mdContext->buf[i] >> 24) & 0xFF);
    }
    kal_mem_cpy(hash, mdContext->digest, 16);
}

/* Basic MD5 step. Transforms buf based on in. */


/*****************************************************************************
 * FUNCTION
 *  Transform
 * DESCRIPTION
 *  
 * PARAMETERS
 *  buf     [?]     
 *  in      [?]     
 * RETURNS
 *  void
 *****************************************************************************/
static void Transform(kal_uint32 *buf, kal_uint32 *in)
{
    /*----------------------------------------------------------------*/
    /* Local Variables                                                */
    /*----------------------------------------------------------------*/
    kal_uint32 a = buf[0], b = buf[1], c = buf[2], d = buf[3];

    /*----------------------------------------------------------------*/
    /* Code Body                                                      */
    /*----------------------------------------------------------------*/
    /* Round 1 */
    FF(a, b, c, d, in[0], S11, UL(3614090360));
    FF(d, a, b, c, in[1], S12, UL(3905402710));
    FF(c, d, a, b, in[2], S13, UL(606105819));
    FF(b, c, d, a, in[3], S14, UL(3250441966));
    FF(a, b, c, d, in[4], S11, UL(4118548399));
    FF(d, a, b, c, in[5], S12, UL(1200080426));
    FF(c, d, a, b, in[6], S13, UL(2821735955));
    FF(b, c, d, a, in[7], S14, UL(4249261313));
    FF(a, b, c, d, in[8], S11, UL(1770035416));
    FF(d, a, b, c, in[9], S12, UL(2336552879));
    FF(c, d, a, b, in[10], S13, UL(4294925233));
    FF(b, c, d, a, in[11], S14, UL(2304563134));
    FF(a, b, c, d, in[12], S11, UL(1804603682));
    FF(d, a, b, c, in[13], S12, UL(4254626195));
    FF(c, d, a, b, in[14], S13, UL(2792965006));
    FF(b, c, d, a, in[15], S14, UL(1236535329));

    /* Round 2 */

    GG(a, b, c, d, in[1], S21, UL(4129170786));
    GG(d, a, b, c, in[6], S22, UL(3225465664));
    GG(c, d, a, b, in[11], S23, UL(643717713));
    GG(b, c, d, a, in[0], S24, UL(3921069994));
    GG(a, b, c, d, in[5], S21, UL(3593408605));
    GG(d, a, b, c, in[10], S22, UL(38016083));
    GG(c, d, a, b, in[15], S23, UL(3634488961));
    GG(b, c, d, a, in[4], S24, UL(3889429448));
    GG(a, b, c, d, in[9], S21, UL(568446438));
    GG(d, a, b, c, in[14], S22, UL(3275163606));
    GG(c, d, a, b, in[3], S23, UL(4107603335));
    GG(b, c, d, a, in[8], S24, UL(1163531501));
    GG(a, b, c, d, in[13], S21, UL(2850285829));
    GG(d, a, b, c, in[2], S22, UL(4243563512));
    GG(c, d, a, b, in[7], S23, UL(1735328473));
    GG(b, c, d, a, in[12], S24, UL(2368359562));

    /* Round 3 */

    HH(a, b, c, d, in[5], S31, UL(4294588738));
    HH(d, a, b, c, in[8], S32, UL(2272392833));
    HH(c, d, a, b, in[11], S33, UL(1839030562));
    HH(b, c, d, a, in[14], S34, UL(4259657740));
    HH(a, b, c, d, in[1], S31, UL(2763975236));
    HH(d, a, b, c, in[4], S32, UL(1272893353));
    HH(c, d, a, b, in[7], S33, UL(4139469664));
    HH(b, c, d, a, in[10], S34, UL(3200236656));
    HH(a, b, c, d, in[13], S31, UL(681279174));
    HH(d, a, b, c, in[0], S32, UL(3936430074));
    HH(c, d, a, b, in[3], S33, UL(3572445317));
    HH(b, c, d, a, in[6], S34, UL(76029189));
    HH(a, b, c, d, in[9], S31, UL(3654602809));
    HH(d, a, b, c, in[12], S32, UL(3873151461));
    HH(c, d, a, b, in[15], S33, UL(530742520));
    HH(b, c, d, a, in[2], S34, UL(3299628645));

    /* Round 4 */

    II(a, b, c, d, in[0], S41, UL(4096336452));
    II(d, a, b, c, in[7], S42, UL(1126891415));
    II(c, d, a, b, in[14], S43, UL(2878612391));
    II(b, c, d, a, in[5], S44, UL(4237533241));
    II(a, b, c, d, in[12], S41, UL(1700485571));
    II(d, a, b, c, in[3], S42, UL(2399980690));
    II(c, d, a, b, in[10], S43, UL(4293915773));
    II(b, c, d, a, in[1], S44, UL(2240044497));
    II(a, b, c, d, in[8], S41, UL(1873313359));
    II(d, a, b, c, in[15], S42, UL(4264355552));
    II(c, d, a, b, in[6], S43, UL(2734768916));
    II(b, c, d, a, in[13], S44, UL(1309151649));
    II(a, b, c, d, in[4], S41, UL(4149444226));
    II(d, a, b, c, in[11], S42, UL(3174756917));
    II(c, d, a, b, in[2], S43, UL(718787259));
    II(b, c, d, a, in[9], S44, UL(3951481745));

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