RE: Des Encryption

[Fitzpatrick, Joe]

UUEncoding is pretty trivial.  Here is a routine to UUEncode and a
routine to calculate the destination size so you can allocate a buffer.

-jjf


// A little helper macro
#define ENCODE(m) ((m) ? (m) + 32 : 0x60)

static void UUEncode( Char *fname,      // The filename we are using
                      Byte *data,       // Binary data to encode
                      UInt datasize,    // Size of the binary data
                      Char *outbuf )    // OUT:  Encoded ASCII data
{
   // Generate the UUencode header      
   StrPrintF(outbuf, "\nbegin 600 %s\n", fname);
   while (*outbuf)
      outbuf++;

   // Full lines first
   while (datasize >= 45)
   {
      UInt n;
                
      // Line header (actual data length (45) + 32)
      *(outbuf++) = 'M';

      // 15 sets of 3 bytes
      for (n = 0 ; n< 15 ; n++)
      {
         ULong l;
                        
         // 3 in...
         l = *(data++);
         l <<= 8;
         l |= *(data++);
         l <<= 8;
         l |= *(data++);

         datasize -= 3;
                        
         // 4 out...
         *(outbuf++) = ENCODE((l >> 18) & 0x3F);
         *(outbuf++) = ENCODE((l >> 12) & 0x3F);
         *(outbuf++) = ENCODE((l >> 6) & 0x3F);
         *(outbuf++) = ENCODE(l & 0x3F);
      }
                
      // New line
      *(outbuf++) = '\n';       
   }

   // Last line (if needed)
   if (datasize)
   {
      // Line header (actual data length + 32)
      *(outbuf++) = (Byte)(datasize + 32);

      while (datasize)
      {
         ULong l;
                        
         // 3 in... (maybe)
         l = *(data++);
         datasize--;
         l <<= 8;
         if (datasize)
         {
            l |= *(data++);
            datasize--;
         }
         l <<= 8;
         if (datasize)
         {
            l |= *(data++);
            datasize--;
         }
                        
         // 4 out... (always)
         *(outbuf++) = ENCODE((l >> 18) & 0x3F);
         *(outbuf++) = ENCODE((l >> 12) & 0x3F);
         *(outbuf++) = ENCODE((l >> 6) & 0x3F);
         *(outbuf++) = ENCODE(l & 0x3F);
      }
                
      // Newline
      *(outbuf++) = '\n';       
   }
        
   // End marker
   StrPrintF(outbuf, "end\n");
}

static UInt GetUUEncodeSize( Char *fname,       // The filename we are
using
                             UInt datasize )    // The size of the
binary data to encode
{
   UInt esize;
        
   // Start with fixed header and footer size
   esize = 16;
   // Add the filename
   esize += StrLen(fname);
        
   // Add full lines.
   // 45 / 3 = 15 * 4 = 60 + length byte + newline = 62
   esize += (datasize / 45) * 62;
        
   // Any data left?
   // Just add a full line worth... (so sue me)
   if (datasize % 45)
      esize += 62;

   return esize;
}

-----Original Message-----
From: Russell Y. Webb [mailto:[EMAIL PROTECTED]]
Sent: Thursday, March 16, 2000 9:46 AM
To: Palm Developer Forum
Subject: Re: Des Encryption


How about the DES routines in the ROM?  Look at Encrypt.h

Russ

>hi,
>
>Anyone know of a port of Des encryption to the palm?
>How about about functions to uuencode?
>
>thanks for any direction you can give.
>
>Matt Laube
>Bachmann Software
>
>
>--
>For information on using the Palm Developer Forums, or to unsubscribe,
please
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