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des.c

/* crypto/des/des.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/opensslconf.h>
#ifndef OPENSSL_SYS_MSDOS
#ifndef OPENSSL_SYS_VMS
#include OPENSSL_UNISTD
#else /* OPENSSL_SYS_VMS */
#ifdef __DECC
#include <unistd.h>
#else /* not __DECC */
#include <math.h>
#endif /* __DECC */
#endif /* OPENSSL_SYS_VMS */
#else /* OPENSSL_SYS_MSDOS */
#include <io.h>
#endif

#include <time.h>
#include "des_ver.h"

#ifdef OPENSSL_SYS_VMS
#include <types.h>
#include <stat.h>
#else
#ifndef _IRIX
#include <sys/types.h>
#endif
#include <sys/stat.h>
#endif
#include <openssl/des.h>
#include <openssl/rand.h>
#include <openssl/ui_compat.h>

void usage(void);
void doencryption(void);
int uufwrite(unsigned char *data, int size, unsigned int num, FILE *fp);
void uufwriteEnd(FILE *fp);
int uufread(unsigned char *out,int size,unsigned int num,FILE *fp);
int uuencode(unsigned char *in,int num,unsigned char *out);
int uudecode(unsigned char *in,int num,unsigned char *out);
void DES_3cbc_encrypt(DES_cblock *input,DES_cblock *output,long length,
      DES_key_schedule sk1,DES_key_schedule sk2,
      DES_cblock *ivec1,DES_cblock *ivec2,int enc);
#ifdef OPENSSL_SYS_VMS
#define EXIT(a) exit(a&0x10000000L)
#else
#define EXIT(a) exit(a)
#endif

#define BUFSIZE (8*1024)
#define VERIFY  1
#define KEYSIZ    8
#define KEYSIZB 1024 /* should hit tty line limit first :-) */
char key[KEYSIZB+1];
int do_encrypt,longk=0;
FILE *DES_IN,*DES_OUT,*CKSUM_OUT;
char uuname[200];
unsigned char uubuf[50];
int uubufnum=0;
#define INUUBUFN  (45*100)
#define OUTUUBUF  (65*100)
unsigned char b[OUTUUBUF];
unsigned char bb[300];
DES_cblock cksum={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
char cksumname[200]="";

int vflag,cflag,eflag,dflag,kflag,bflag,fflag,sflag,uflag,flag3,hflag,error;

int main(int argc, char **argv)
      {
      int i;
      struct stat ins,outs;
      char *p;
      char *in=NULL,*out=NULL;

      vflag=cflag=eflag=dflag=kflag=hflag=bflag=fflag=sflag=uflag=flag3=0;
      error=0;
      memset(key,0,sizeof(key));

      for (i=1; i<argc; i++)
            {
            p=argv[i];
            if ((p[0] == '-') && (p[1] != '\0'))
                  {
                  p++;
                  while (*p)
                        {
                        switch (*(p++))
                              {
                        case '3':
                              flag3=1;
                              longk=1;
                              break;
                        case 'c':
                              cflag=1;
                              strncpy(cksumname,p,200);
                              cksumname[sizeof(cksumname)-1]='\0';
                              p+=strlen(cksumname);
                              break;
                        case 'C':
                              cflag=1;
                              longk=1;
                              strncpy(cksumname,p,200);
                              cksumname[sizeof(cksumname)-1]='\0';
                              p+=strlen(cksumname);
                              break;
                        case 'e':
                              eflag=1;
                              break;
                        case 'v':
                              vflag=1;
                              break;
                        case 'E':
                              eflag=1;
                              longk=1;
                              break;
                        case 'd':
                              dflag=1;
                              break;
                        case 'D':
                              dflag=1;
                              longk=1;
                              break;
                        case 'b':
                              bflag=1;
                              break;
                        case 'f':
                              fflag=1;
                              break;
                        case 's':
                              sflag=1;
                              break;
                        case 'u':
                              uflag=1;
                              strncpy(uuname,p,200);
                              uuname[sizeof(uuname)-1]='\0';
                              p+=strlen(uuname);
                              break;
                        case 'h':
                              hflag=1;
                              break;
                        case 'k':
                              kflag=1;
                              if ((i+1) == argc)
                                    {
                                    fputs("must have a key with the -k option\n",stderr);
                                    error=1;
                                    }
                              else
                                    {
                                    int j;

                                    i++;
                                    strncpy(key,argv[i],KEYSIZB);
                                    for (j=strlen(argv[i])-1; j>=0; j--)
                                          argv[i][j]='\0';
                                    }
                              break;
                        default:
                              fprintf(stderr,"'%c' unknown flag\n",p[-1]);
                              error=1;
                              break;
                              }
                        }
                  }
            else
                  {
                  if (in == NULL)
                        in=argv[i];
                  else if (out == NULL)
                        out=argv[i];
                  else
                        error=1;
                  }
            }
      if (error) usage();
      /* We either
       * do checksum or
       * do encrypt or
       * do decrypt or
       * do decrypt then ckecksum or
       * do checksum then encrypt
       */
      if (((eflag+dflag) == 1) || cflag)
            {
            if (eflag) do_encrypt=DES_ENCRYPT;
            if (dflag) do_encrypt=DES_DECRYPT;
            }
      else
            {
            if (vflag) 
                  {
#ifndef _Windows              
                  fprintf(stderr,"des(1) built with %s\n",libdes_version);
#endif                  
                  EXIT(1);
                  }
            else usage();
            }

#ifndef _Windows              
      if (vflag) fprintf(stderr,"des(1) built with %s\n",libdes_version);
#endif                  
      if (  (in != NULL) &&
            (out != NULL) &&
#ifndef OPENSSL_SYS_MSDOS
            (stat(in,&ins) != -1) &&
            (stat(out,&outs) != -1) &&
            (ins.st_dev == outs.st_dev) &&
            (ins.st_ino == outs.st_ino))
#else /* OPENSSL_SYS_MSDOS */
            (strcmp(in,out) == 0))
#endif
                  {
                  fputs("input and output file are the same\n",stderr);
                  EXIT(3);
                  }

      if (!kflag)
            if (des_read_pw_string(key,KEYSIZB+1,"Enter key:",eflag?VERIFY:0))
                  {
                  fputs("password error\n",stderr);
                  EXIT(2);
                  }

      if (in == NULL)
            DES_IN=stdin;
      else if ((DES_IN=fopen(in,"r")) == NULL)
            {
            perror("opening input file");
            EXIT(4);
            }

      CKSUM_OUT=stdout;
      if (out == NULL)
            {
            DES_OUT=stdout;
            CKSUM_OUT=stderr;
            }
      else if ((DES_OUT=fopen(out,"w")) == NULL)
            {
            perror("opening output file");
            EXIT(5);
            }

#ifdef OPENSSL_SYS_MSDOS
      /* This should set the file to binary mode. */
      {
#include <fcntl.h>
      if (!(uflag && dflag))
            setmode(fileno(DES_IN),O_BINARY);
      if (!(uflag && eflag))
            setmode(fileno(DES_OUT),O_BINARY);
      }
#endif

      doencryption();
      fclose(DES_IN);
      fclose(DES_OUT);
      EXIT(0);
      }

void usage(void)
      {
      char **u;
      static const char *Usage[]={
"des <options> [input-file [output-file]]",
"options:",
"-v         : des(1) version number",
"-e         : encrypt using SunOS compatible user key to DES key conversion.",
"-E         : encrypt ",
"-d         : decrypt using SunOS compatible user key to DES key conversion.",
"-D         : decrypt ",
"-c[ckname] : generate a cbc_cksum using SunOS compatible user key to",
"             DES key conversion and output to ckname (stdout default,",
"             stderr if data being output on stdout).  The checksum is",
"             generated before encryption and after decryption if used",
"             in conjunction with -[eEdD].",
"-C[ckname] : generate a cbc_cksum as for -c but compatible with -[ED].",
"-k key     : use key 'key'",
"-h         : the key that is entered will be a hexadecimal number",
"             that is used directly as the des key",
"-u[uuname] : input file is uudecoded if -[dD] or output uuencoded data if -[eE]",
"             (uuname is the filename to put in the uuencode header).",
"-b         : encrypt using DES in ecb encryption mode, the default is cbc mode.",
"-3         : encrypt using triple DES encryption.  This uses 2 keys",
"             generated from the input key.  If the input key is less",
"             than 8 characters long, this is equivalent to normal",
"             encryption.  Default is triple cbc, -b makes it triple ecb.",
NULL
};
      for (u=(char **)Usage; *u; u++)
            {
            fputs(*u,stderr);
            fputc('\n',stderr);
            }

      EXIT(1);
      }

void doencryption(void)
      {
#ifdef _LIBC
      extern unsigned long time();
#endif

      register int i;
      DES_key_schedule ks,ks2;
      DES_cblock iv,iv2;
      char *p;
      int num=0,j,k,l,rem,ll,len,last,ex=0;
      DES_cblock kk,k2;
      FILE *O;
      int Exit=0;
#ifndef OPENSSL_SYS_MSDOS
      static unsigned char buf[BUFSIZE+8],obuf[BUFSIZE+8];
#else
      static unsigned char *buf=NULL,*obuf=NULL;

      if (buf == NULL)
            {
            if (    (( buf=OPENSSL_malloc(BUFSIZE+8)) == NULL) ||
                  ((obuf=OPENSSL_malloc(BUFSIZE+8)) == NULL))
                  {
                  fputs("Not enough memory\n",stderr);
                  Exit=10;
                  goto problems;
                  }
            }
#endif

      if (hflag)
            {
            j=(flag3?16:8);
            p=key;
            for (i=0; i<j; i++)
                  {
                  k=0;
                  if ((*p <= '9') && (*p >= '0'))
                        k=(*p-'0')<<4;
                  else if ((*p <= 'f') && (*p >= 'a'))
                        k=(*p-'a'+10)<<4;
                  else if ((*p <= 'F') && (*p >= 'A'))
                        k=(*p-'A'+10)<<4;
                  else
                        {
                        fputs("Bad hex key\n",stderr);
                        Exit=9;
                        goto problems;
                        }
                  p++;
                  if ((*p <= '9') && (*p >= '0'))
                        k|=(*p-'0');
                  else if ((*p <= 'f') && (*p >= 'a'))
                        k|=(*p-'a'+10);
                  else if ((*p <= 'F') && (*p >= 'A'))
                        k|=(*p-'A'+10);
                  else
                        {
                        fputs("Bad hex key\n",stderr);
                        Exit=9;
                        goto problems;
                        }
                  p++;
                  if (i < 8)
                        kk[i]=k;
                  else
                        k2[i-8]=k;
                  }
            DES_set_key_unchecked(&k2,&ks2);
            OPENSSL_cleanse(k2,sizeof(k2));
            }
      else if (longk || flag3)
            {
            if (flag3)
                  {
                  DES_string_to_2keys(key,&kk,&k2);
                  DES_set_key_unchecked(&k2,&ks2);
                  OPENSSL_cleanse(k2,sizeof(k2));
                  }
            else
                  DES_string_to_key(key,&kk);
            }
      else
            for (i=0; i<KEYSIZ; i++)
                  {
                  l=0;
                  k=key[i];
                  for (j=0; j<8; j++)
                        {
                        if (k&1) l++;
                        k>>=1;
                        }
                  if (l & 1)
                        kk[i]=key[i]&0x7f;
                  else
                        kk[i]=key[i]|0x80;
                  }

      DES_set_key_unchecked(&kk,&ks);
      OPENSSL_cleanse(key,sizeof(key));
      OPENSSL_cleanse(kk,sizeof(kk));
      /* woops - A bug that does not showup under unix :-( */
      memset(iv,0,sizeof(iv));
      memset(iv2,0,sizeof(iv2));

      l=1;
      rem=0;
      /* first read */
      if (eflag || (!dflag && cflag))
            {
            for (;;)
                  {
                  num=l=fread(&(buf[rem]),1,BUFSIZE,DES_IN);
                  l+=rem;
                  num+=rem;
                  if (l < 0)
                        {
                        perror("read error");
                        Exit=6;
                        goto problems;
                        }

                  rem=l%8;
                  len=l-rem;
                  if (feof(DES_IN))
                        {
                        for (i=7-rem; i>0; i--)
                              RAND_pseudo_bytes(buf + l++, 1);
                        buf[l++]=rem;
                        ex=1;
                        len+=rem;
                        }
                  else
                        l-=rem;

                  if (cflag)
                        {
                        DES_cbc_cksum(buf,&cksum,
                              (long)len,&ks,&cksum);
                        if (!eflag)
                              {
                              if (feof(DES_IN)) break;
                              else continue;
                              }
                        }

                  if (bflag && !flag3)
                        for (i=0; i<l; i+=8)
                              DES_ecb_encrypt(
                                    (DES_cblock *)&(buf[i]),
                                    (DES_cblock *)&(obuf[i]),
                                    &ks,do_encrypt);
                  else if (flag3 && bflag)
                        for (i=0; i<l; i+=8)
                              DES_ecb2_encrypt(
                                    (DES_cblock *)&(buf[i]),
                                    (DES_cblock *)&(obuf[i]),
                                    &ks,&ks2,do_encrypt);
                  else if (flag3 && !bflag)
                        {
                        char tmpbuf[8];

                        if (rem) memcpy(tmpbuf,&(buf[l]),
                              (unsigned int)rem);
                        DES_3cbc_encrypt(
                              (DES_cblock *)buf,(DES_cblock *)obuf,
                              (long)l,ks,ks2,&iv,
                              &iv2,do_encrypt);
                        if (rem) memcpy(&(buf[l]),tmpbuf,
                              (unsigned int)rem);
                        }
                  else
                        {
                        DES_cbc_encrypt(
                              buf,obuf,
                              (long)l,&ks,&iv,do_encrypt);
                        if (l >= 8) memcpy(iv,&(obuf[l-8]),8);
                        }
                  if (rem) memcpy(buf,&(buf[l]),(unsigned int)rem);

                  i=0;
                  while (i < l)
                        {
                        if (uflag)
                              j=uufwrite(obuf,1,(unsigned int)l-i,
                                    DES_OUT);
                        else
                              j=fwrite(obuf,1,(unsigned int)l-i,
                                    DES_OUT);
                        if (j == -1)
                              {
                              perror("Write error");
                              Exit=7;
                              goto problems;
                              }
                        i+=j;
                        }
                  if (feof(DES_IN))
                        {
                        if (uflag) uufwriteEnd(DES_OUT);
                        break;
                        }
                  }
            }
      else /* decrypt */
            {
            ex=1;
            for (;;)
                  {
                  if (ex) {
                        if (uflag)
                              l=uufread(buf,1,BUFSIZE,DES_IN);
                        else
                              l=fread(buf,1,BUFSIZE,DES_IN);
                        ex=0;
                        rem=l%8;
                        l-=rem;
                        }
                  if (l < 0)
                        {
                        perror("read error");
                        Exit=6;
                        goto problems;
                        }

                  if (bflag && !flag3)
                        for (i=0; i<l; i+=8)
                              DES_ecb_encrypt(
                                    (DES_cblock *)&(buf[i]),
                                    (DES_cblock *)&(obuf[i]),
                                    &ks,do_encrypt);
                  else if (flag3 && bflag)
                        for (i=0; i<l; i+=8)
                              DES_ecb2_encrypt(
                                    (DES_cblock *)&(buf[i]),
                                    (DES_cblock *)&(obuf[i]),
                                    &ks,&ks2,do_encrypt);
                  else if (flag3 && !bflag)
                        {
                        DES_3cbc_encrypt(
                              (DES_cblock *)buf,(DES_cblock *)obuf,
                              (long)l,ks,ks2,&iv,
                              &iv2,do_encrypt);
                        }
                  else
                        {
                        DES_cbc_encrypt(
                              buf,obuf,
                              (long)l,&ks,&iv,do_encrypt);
                        if (l >= 8) memcpy(iv,&(buf[l-8]),8);
                        }

                  if (uflag)
                        ll=uufread(&(buf[rem]),1,BUFSIZE,DES_IN);
                  else
                        ll=fread(&(buf[rem]),1,BUFSIZE,DES_IN);
                  ll+=rem;
                  rem=ll%8;
                  ll-=rem;
                  if (feof(DES_IN) && (ll == 0))
                        {
                        last=obuf[l-1];

                        if ((last > 7) || (last < 0))
                              {
                              fputs("The file was not decrypted correctly.\n",
                                    stderr);
                              Exit=8;
                              last=0;
                              }
                        l=l-8+last;
                        }
                  i=0;
                  if (cflag) DES_cbc_cksum(obuf,
                        (DES_cblock *)cksum,(long)l/8*8,&ks,
                        (DES_cblock *)cksum);
                  while (i != l)
                        {
                        j=fwrite(obuf,1,(unsigned int)l-i,DES_OUT);
                        if (j == -1)
                              {
                              perror("Write error");
                              Exit=7;
                              goto problems;
                              }
                        i+=j;
                        }
                  l=ll;
                  if ((l == 0) && feof(DES_IN)) break;
                  }
            }
      if (cflag)
            {
            l=0;
            if (cksumname[0] != '\0')
                  {
                  if ((O=fopen(cksumname,"w")) != NULL)
                        {
                        CKSUM_OUT=O;
                        l=1;
                        }
                  }
            for (i=0; i<8; i++)
                  fprintf(CKSUM_OUT,"%02X",cksum[i]);
            fprintf(CKSUM_OUT,"\n");
            if (l) fclose(CKSUM_OUT);
            }
problems:
      OPENSSL_cleanse(buf,sizeof(buf));
      OPENSSL_cleanse(obuf,sizeof(obuf));
      OPENSSL_cleanse(&ks,sizeof(ks));
      OPENSSL_cleanse(&ks2,sizeof(ks2));
      OPENSSL_cleanse(iv,sizeof(iv));
      OPENSSL_cleanse(iv2,sizeof(iv2));
      OPENSSL_cleanse(kk,sizeof(kk));
      OPENSSL_cleanse(k2,sizeof(k2));
      OPENSSL_cleanse(uubuf,sizeof(uubuf));
      OPENSSL_cleanse(b,sizeof(b));
      OPENSSL_cleanse(bb,sizeof(bb));
      OPENSSL_cleanse(cksum,sizeof(cksum));
      if (Exit) EXIT(Exit);
      }

/*    We ignore this parameter but it should be > ~50 I believe    */
int uufwrite(unsigned char *data, int size, unsigned int num, FILE *fp)
      {
      int i,j,left,rem,ret=num;
      static int start=1;

      if (start)
            {
            fprintf(fp,"begin 600 %s\n",
                  (uuname[0] == '\0')?"text.d":uuname);
            start=0;
            }

      if (uubufnum)
            {
            if (uubufnum+num < 45)
                  {
                  memcpy(&(uubuf[uubufnum]),data,(unsigned int)num);
                  uubufnum+=num;
                  return(num);
                  }
            else
                  {
                  i=45-uubufnum;
                  memcpy(&(uubuf[uubufnum]),data,(unsigned int)i);
                  j=uuencode((unsigned char *)uubuf,45,b);
                  fwrite(b,1,(unsigned int)j,fp);
                  uubufnum=0;
                  data+=i;
                  num-=i;
                  }
            }

      for (i=0; i<(((int)num)-INUUBUFN); i+=INUUBUFN)
            {
            j=uuencode(&(data[i]),INUUBUFN,b);
            fwrite(b,1,(unsigned int)j,fp);
            }
      rem=(num-i)%45;
      left=(num-i-rem);
      if (left)
            {
            j=uuencode(&(data[i]),left,b);
            fwrite(b,1,(unsigned int)j,fp);
            i+=left;
            }
      if (i != num)
            {
            memcpy(uubuf,&(data[i]),(unsigned int)rem);
            uubufnum=rem;
            }
      return(ret);
      }

void uufwriteEnd(FILE *fp)
      {
      int j;
      static const char *end=" \nend\n";

      if (uubufnum != 0)
            {
            uubuf[uubufnum]='\0';
            uubuf[uubufnum+1]='\0';
            uubuf[uubufnum+2]='\0';
            j=uuencode(uubuf,uubufnum,b);
            fwrite(b,1,(unsigned int)j,fp);
            }
      fwrite(end,1,strlen(end),fp);
      }

/* int size:  should always be > ~ 60; I actually ignore this parameter :-)    */
int uufread(unsigned char *out, int size, unsigned int num, FILE *fp)
      {
      int i,j,tot;
      static int done=0;
      static int valid=0;
      static int start=1;

      if (start)
            {
            for (;;)
                  {
                  b[0]='\0';
                  fgets((char *)b,300,fp);
                  if (b[0] == '\0')
                        {
                        fprintf(stderr,"no 'begin' found in uuencoded input\n");
                        return(-1);
                        }
                  if (strncmp((char *)b,"begin ",6) == 0) break;
                  }
            start=0;
            }
      if (done) return(0);
      tot=0;
      if (valid)
            {
            memcpy(out,bb,(unsigned int)valid);
            tot=valid;
            valid=0;
            }
      for (;;)
            {
            b[0]='\0';
            fgets((char *)b,300,fp);
            if (b[0] == '\0') break;
            i=strlen((char *)b);
            if ((b[0] == 'e') && (b[1] == 'n') && (b[2] == 'd'))
                  {
                  done=1;
                  while (!feof(fp))
                        {
                        fgets((char *)b,300,fp);
                        }
                  break;
                  }
            i=uudecode(b,i,bb);
            if (i < 0) break;
            if ((i+tot+8) > num)
                  {
                  /* num to copy to make it a multiple of 8 */
                  j=(num/8*8)-tot-8;
                  memcpy(&(out[tot]),bb,(unsigned int)j);
                  tot+=j;
                  memcpy(bb,&(bb[j]),(unsigned int)i-j);
                  valid=i-j;
                  break;
                  }
            memcpy(&(out[tot]),bb,(unsigned int)i);
            tot+=i;
            }
      return(tot);
      }

#define ccc2l(c,l)      (l =((DES_LONG)(*((c)++)))<<16, \
                   l|=((DES_LONG)(*((c)++)))<< 8, \
                   l|=((DES_LONG)(*((c)++))))

#define l2ccc(l,c)      (*((c)++)=(unsigned char)(((l)>>16)&0xff), \
                    *((c)++)=(unsigned char)(((l)>> 8)&0xff), \
                    *((c)++)=(unsigned char)(((l)    )&0xff))


int uuencode(unsigned char *in, int num, unsigned char *out)
      {
      int j,i,n,tot=0;
      DES_LONG l;
      register unsigned char *p;
      p=out;

      for (j=0; j<num; j+=45)
            {
            if (j+45 > num)
                  i=(num-j);
            else  i=45;
            *(p++)=i+' ';
            for (n=0; n<i; n+=3)
                  {
                  ccc2l(in,l);
                  *(p++)=((l>>18)&0x3f)+' ';
                  *(p++)=((l>>12)&0x3f)+' ';
                  *(p++)=((l>> 6)&0x3f)+' ';
                  *(p++)=((l    )&0x3f)+' ';
                  tot+=4;
                  }
            *(p++)='\n';
            tot+=2;
            }
      *p='\0';
      l=0;
      return(tot);
      }

int uudecode(unsigned char *in, int num, unsigned char *out)
      {
      int j,i,k;
      unsigned int n=0,space=0;
      DES_LONG l;
      DES_LONG w,x,y,z;
      unsigned int blank=(unsigned int)'\n'-' ';

      for (j=0; j<num; )
            {
            n= *(in++)-' ';
            if (n == blank)
                  {
                  n=0;
                  in--;
                  }
            if (n > 60)
                  {
                  fprintf(stderr,"uuencoded line length too long\n");
                  return(-1);
                  }
            j++;

            for (i=0; i<n; j+=4,i+=3)
                  {
                  /* the following is for cases where spaces are
                   * removed from lines.
                   */
                  if (space)
                        {
                        w=x=y=z=0;
                        }
                  else
                        {
                        w= *(in++)-' ';
                        x= *(in++)-' ';
                        y= *(in++)-' ';
                        z= *(in++)-' ';
                        }
                  if ((w > 63) || (x > 63) || (y > 63) || (z > 63))
                        {
                        k=0;
                        if (w == blank) k=1;
                        if (x == blank) k=2;
                        if (y == blank) k=3;
                        if (z == blank) k=4;
                        space=1;
                        switch (k) {
                        case 1:     w=0; in--;
                        case 2: x=0; in--;
                        case 3: y=0; in--;
                        case 4: z=0; in--;
                              break;
                        case 0:
                              space=0;
                              fprintf(stderr,"bad uuencoded data values\n");
                              w=x=y=z=0;
                              return(-1);
                              break;
                              }
                        }
                  l=(w<<18)|(x<<12)|(y<< 6)|(z    );
                  l2ccc(l,out);
                  }
            if (*(in++) != '\n')
                  {
                  fprintf(stderr,"missing nl in uuencoded line\n");
                  w=x=y=z=0;
                  return(-1);
                  }
            j++;
            }
      *out='\0';
      w=x=y=z=0;
      return(n);
      }

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