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enc.c

/* apps/enc.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 "apps.h"
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
#include <openssl/rand.h>
#include <openssl/pem.h>
#include <openssl/comp.h>
#include <ctype.h>

int set_hex(char *in,unsigned char *out,int size);
#undef SIZE
#undef BSIZE
#undef PROG

#define SIZE      (512)
#define BSIZE     (8*1024)
#define     PROG  enc_main

static void show_ciphers(const OBJ_NAME *name,void *bio_)
      {
      BIO *bio=bio_;
      static int n;

      if(!islower((unsigned char)*name->name))
            return;

      BIO_printf(bio,"-%-25s",name->name);
      if(++n == 3)
            {
            BIO_printf(bio,"\n");
            n=0;
            }
      else
            BIO_printf(bio," ");
      }

int MAIN(int, char **);

int MAIN(int argc, char **argv)
      {
      static const char magic[]="Salted__";
      char mbuf[sizeof magic-1];
      char *strbuf=NULL;
      unsigned char *buff=NULL,*bufsize=NULL;
      int bsize=BSIZE,verbose=0;
      int ret=1,inl;
      int nopad = 0;
      unsigned char key[EVP_MAX_KEY_LENGTH],iv[EVP_MAX_IV_LENGTH];
      unsigned char salt[PKCS5_SALT_LEN];
      char *str=NULL, *passarg = NULL, *pass = NULL;
      char *hkey=NULL,*hiv=NULL,*hsalt = NULL;
      char *md=NULL;
      int enc=1,printkey=0,i,base64=0;
#ifdef ZLIB
      int do_zlib=0;
      BIO *bzl = NULL;
#endif
      int debug=0,olb64=0,nosalt=0;
      const EVP_CIPHER *cipher=NULL,*c;
      EVP_CIPHER_CTX *ctx = NULL;
      char *inf=NULL,*outf=NULL;
      BIO *in=NULL,*out=NULL,*b64=NULL,*benc=NULL,*rbio=NULL,*wbio=NULL;
#define PROG_NAME_SIZE  39
      char pname[PROG_NAME_SIZE+1];
#ifndef OPENSSL_NO_ENGINE
      char *engine = NULL;
#endif
      const EVP_MD *dgst=NULL;

      apps_startup();

      if (bio_err == NULL)
            if ((bio_err=BIO_new(BIO_s_file())) != NULL)
                  BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);

      if (!load_config(bio_err, NULL))
            goto end;

      /* first check the program name */
      program_name(argv[0],pname,sizeof pname);
      if (strcmp(pname,"base64") == 0)
            base64=1;
#ifdef ZLIB
      if (strcmp(pname,"zlib") == 0)
            do_zlib=1;
#endif

      cipher=EVP_get_cipherbyname(pname);
#ifdef ZLIB
      if (!do_zlib && !base64 && (cipher == NULL)
                        && (strcmp(pname,"enc") != 0))
#else
      if (!base64 && (cipher == NULL) && (strcmp(pname,"enc") != 0))
#endif
            {
            BIO_printf(bio_err,"%s is an unknown cipher\n",pname);
            goto bad;
            }

      argc--;
      argv++;
      while (argc >= 1)
            {
            if    (strcmp(*argv,"-e") == 0)
                  enc=1;
            else if (strcmp(*argv,"-in") == 0)
                  {
                  if (--argc < 1) goto bad;
                  inf= *(++argv);
                  }
            else if (strcmp(*argv,"-out") == 0)
                  {
                  if (--argc < 1) goto bad;
                  outf= *(++argv);
                  }
            else if (strcmp(*argv,"-pass") == 0)
                  {
                  if (--argc < 1) goto bad;
                  passarg= *(++argv);
                  }
#ifndef OPENSSL_NO_ENGINE
            else if (strcmp(*argv,"-engine") == 0)
                  {
                  if (--argc < 1) goto bad;
                  engine= *(++argv);
                  }
#endif
            else if     (strcmp(*argv,"-d") == 0)
                  enc=0;
            else if     (strcmp(*argv,"-p") == 0)
                  printkey=1;
            else if     (strcmp(*argv,"-v") == 0)
                  verbose=1;
            else if     (strcmp(*argv,"-nopad") == 0)
                  nopad=1;
            else if     (strcmp(*argv,"-salt") == 0)
                  nosalt=0;
            else if     (strcmp(*argv,"-nosalt") == 0)
                  nosalt=1;
            else if     (strcmp(*argv,"-debug") == 0)
                  debug=1;
            else if     (strcmp(*argv,"-P") == 0)
                  printkey=2;
            else if     (strcmp(*argv,"-A") == 0)
                  olb64=1;
            else if     (strcmp(*argv,"-a") == 0)
                  base64=1;
            else if     (strcmp(*argv,"-base64") == 0)
                  base64=1;
#ifdef ZLIB
            else if     (strcmp(*argv,"-z") == 0)
                  do_zlib=1;
#endif
            else if (strcmp(*argv,"-bufsize") == 0)
                  {
                  if (--argc < 1) goto bad;
                  bufsize=(unsigned char *)*(++argv);
                  }
            else if (strcmp(*argv,"-k") == 0)
                  {
                  if (--argc < 1) goto bad;
                  str= *(++argv);
                  }
            else if (strcmp(*argv,"-kfile") == 0)
                  {
                  static char buf[128];
                  FILE *infile;
                  char *file;

                  if (--argc < 1) goto bad;
                  file= *(++argv);
                  infile=fopen(file,"r");
                  if (infile == NULL)
                        {
                        BIO_printf(bio_err,"unable to read key from '%s'\n",
                              file);
                        goto bad;
                        }
                  buf[0]='\0';
                  if (!fgets(buf,sizeof buf,infile))
                        {
                        BIO_printf(bio_err,"unable to read key from '%s'\n",
                              file);
                        goto bad;
                        }
                  fclose(infile);
                  i=strlen(buf);
                  if ((i > 0) &&
                        ((buf[i-1] == '\n') || (buf[i-1] == '\r')))
                        buf[--i]='\0';
                  if ((i > 0) &&
                        ((buf[i-1] == '\n') || (buf[i-1] == '\r')))
                        buf[--i]='\0';
                  if (i < 1)
                        {
                        BIO_printf(bio_err,"zero length password\n");
                        goto bad;
                        }
                  str=buf;
                  }
            else if (strcmp(*argv,"-K") == 0)
                  {
                  if (--argc < 1) goto bad;
                  hkey= *(++argv);
                  }
            else if (strcmp(*argv,"-S") == 0)
                  {
                  if (--argc < 1) goto bad;
                  hsalt= *(++argv);
                  }
            else if (strcmp(*argv,"-iv") == 0)
                  {
                  if (--argc < 1) goto bad;
                  hiv= *(++argv);
                  }
            else if (strcmp(*argv,"-md") == 0)
                  {
                  if (--argc < 1) goto bad;
                  md= *(++argv);
                  }
            else if     ((argv[0][0] == '-') &&
                  ((c=EVP_get_cipherbyname(&(argv[0][1]))) != NULL))
                  {
                  cipher=c;
                  }
            else if (strcmp(*argv,"-none") == 0)
                  cipher=NULL;
            else
                  {
                  BIO_printf(bio_err,"unknown option '%s'\n",*argv);
bad:
                  BIO_printf(bio_err,"options are\n");
                  BIO_printf(bio_err,"%-14s input file\n","-in <file>");
                  BIO_printf(bio_err,"%-14s output file\n","-out <file>");
                  BIO_printf(bio_err,"%-14s pass phrase source\n","-pass <arg>");
                  BIO_printf(bio_err,"%-14s encrypt\n","-e");
                  BIO_printf(bio_err,"%-14s decrypt\n","-d");
                  BIO_printf(bio_err,"%-14s base64 encode/decode, depending on encryption flag\n","-a/-base64");
                  BIO_printf(bio_err,"%-14s passphrase is the next argument\n","-k");
                  BIO_printf(bio_err,"%-14s passphrase is the first line of the file argument\n","-kfile");
                  BIO_printf(bio_err,"%-14s the next argument is the md to use to create a key\n","-md");
                  BIO_printf(bio_err,"%-14s   from a passphrase.  One of md2, md5, sha or sha1\n","");
                  BIO_printf(bio_err,"%-14s salt in hex is the next argument\n","-S");
                  BIO_printf(bio_err,"%-14s key/iv in hex is the next argument\n","-K/-iv");
                  BIO_printf(bio_err,"%-14s print the iv/key (then exit if -P)\n","-[pP]");
                  BIO_printf(bio_err,"%-14s buffer size\n","-bufsize <n>");
                  BIO_printf(bio_err,"%-14s disable standard block padding\n","-nopad");
#ifndef OPENSSL_NO_ENGINE
                  BIO_printf(bio_err,"%-14s use engine e, possibly a hardware device.\n","-engine e");
#endif

                  BIO_printf(bio_err,"Cipher Types\n");
                  OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_CIPHER_METH,
                                     show_ciphers,
                                     bio_err);
                  BIO_printf(bio_err,"\n");

                  goto end;
                  }
            argc--;
            argv++;
            }

#ifndef OPENSSL_NO_ENGINE
        setup_engine(bio_err, engine, 0);
#endif

      if (md && (dgst=EVP_get_digestbyname(md)) == NULL)
            {
            BIO_printf(bio_err,"%s is an unsupported message digest type\n",md);
            goto end;
            }

      if (dgst == NULL)
            {
            dgst = EVP_md5();
            }

      if (bufsize != NULL)
            {
            unsigned long n;

            for (n=0; *bufsize; bufsize++)
                  {
                  i= *bufsize;
                  if ((i <= '9') && (i >= '0'))
                        n=n*10+i-'0';
                  else if (i == 'k')
                        {
                        n*=1024;
                        bufsize++;
                        break;
                        }
                  }
            if (*bufsize != '\0')
                  {
                  BIO_printf(bio_err,"invalid 'bufsize' specified.\n");
                  goto end;
                  }

            /* It must be large enough for a base64 encoded line */
            if (base64 && n < 80) n=80;

            bsize=(int)n;
            if (verbose) BIO_printf(bio_err,"bufsize=%d\n",bsize);
            }

      strbuf=OPENSSL_malloc(SIZE);
      buff=(unsigned char *)OPENSSL_malloc(EVP_ENCODE_LENGTH(bsize));
      if ((buff == NULL) || (strbuf == NULL))
            {
            BIO_printf(bio_err,"OPENSSL_malloc failure %ld\n",(long)EVP_ENCODE_LENGTH(bsize));
            goto end;
            }

      in=BIO_new(BIO_s_file());
      out=BIO_new(BIO_s_file());
      if ((in == NULL) || (out == NULL))
            {
            ERR_print_errors(bio_err);
            goto end;
            }
      if (debug)
            {
            BIO_set_callback(in,BIO_debug_callback);
            BIO_set_callback(out,BIO_debug_callback);
            BIO_set_callback_arg(in,(char *)bio_err);
            BIO_set_callback_arg(out,(char *)bio_err);
            }

      if (inf == NULL)
              {
#ifndef OPENSSL_NO_SETVBUF_IONBF
            if (bufsize != NULL)
                  setvbuf(stdin, (char *)NULL, _IONBF, 0);
#endif /* ndef OPENSSL_NO_SETVBUF_IONBF */
            BIO_set_fp(in,stdin,BIO_NOCLOSE);
              }
      else
            {
            if (BIO_read_filename(in,inf) <= 0)
                  {
                  perror(inf);
                  goto end;
                  }
            }

      if(!str && passarg) {
            if(!app_passwd(bio_err, passarg, NULL, &pass, NULL)) {
                  BIO_printf(bio_err, "Error getting password\n");
                  goto end;
            }
            str = pass;
      }

      if ((str == NULL) && (cipher != NULL) && (hkey == NULL))
            {
            for (;;)
                  {
                  char buf[200];

                  BIO_snprintf(buf,sizeof buf,"enter %s %s password:",
                             OBJ_nid2ln(EVP_CIPHER_nid(cipher)),
                             (enc)?"encryption":"decryption");
                  strbuf[0]='\0';
                  i=EVP_read_pw_string((char *)strbuf,SIZE,buf,enc);
                  if (i == 0)
                        {
                        if (strbuf[0] == '\0')
                              {
                              ret=1;
                              goto end;
                              }
                        str=strbuf;
                        break;
                        }
                  if (i < 0)
                        {
                        BIO_printf(bio_err,"bad password read\n");
                        goto end;
                        }
                  }
            }


      if (outf == NULL)
            {
            BIO_set_fp(out,stdout,BIO_NOCLOSE);
#ifndef OPENSSL_NO_SETVBUF_IONBF
            if (bufsize != NULL)
                  setvbuf(stdout, (char *)NULL, _IONBF, 0);
#endif /* ndef OPENSSL_NO_SETVBUF_IONBF */
#ifdef OPENSSL_SYS_VMS
            {
            BIO *tmpbio = BIO_new(BIO_f_linebuffer());
            out = BIO_push(tmpbio, out);
            }
#endif
            }
      else
            {
            if (BIO_write_filename(out,outf) <= 0)
                  {
                  perror(outf);
                  goto end;
                  }
            }

      rbio=in;
      wbio=out;

#ifdef ZLIB

      if (do_zlib)
            {
            if ((bzl=BIO_new(BIO_f_zlib())) == NULL)
                  goto end;
            if (enc)
                  wbio=BIO_push(bzl,wbio);
            else
                  rbio=BIO_push(bzl,rbio);
            }
#endif

      if (base64)
            {
            if ((b64=BIO_new(BIO_f_base64())) == NULL)
                  goto end;
            if (debug)
                  {
                  BIO_set_callback(b64,BIO_debug_callback);
                  BIO_set_callback_arg(b64,(char *)bio_err);
                  }
            if (olb64)
                  BIO_set_flags(b64,BIO_FLAGS_BASE64_NO_NL);
            if (enc)
                  wbio=BIO_push(b64,wbio);
            else
                  rbio=BIO_push(b64,rbio);
            }

      if (cipher != NULL)
            {
            /* Note that str is NULL if a key was passed on the command
             * line, so we get no salt in that case. Is this a bug?
             */
            if (str != NULL)
                  {
                  /* Salt handling: if encrypting generate a salt and
                   * write to output BIO. If decrypting read salt from
                   * input BIO.
                   */
                  unsigned char *sptr;
                  if(nosalt) sptr = NULL;
                  else {
                        if(enc) {
                              if(hsalt) {
                                    if(!set_hex(hsalt,salt,sizeof salt)) {
                                          BIO_printf(bio_err,
                                                "invalid hex salt value\n");
                                          goto end;
                                    }
                              } else if (RAND_pseudo_bytes(salt, sizeof salt) < 0)
                                    goto end;
                              /* If -P option then don't bother writing */
                              if((printkey != 2)
                                 && (BIO_write(wbio,magic,
                                           sizeof magic-1) != sizeof magic-1
                                     || BIO_write(wbio,
                                              (char *)salt,
                                              sizeof salt) != sizeof salt)) {
                                    BIO_printf(bio_err,"error writing output file\n");
                                    goto end;
                              }
                        } else if(BIO_read(rbio,mbuf,sizeof mbuf) != sizeof mbuf
                                || BIO_read(rbio,
                                          (unsigned char *)salt,
                            sizeof salt) != sizeof salt) {
                              BIO_printf(bio_err,"error reading input file\n");
                              goto end;
                        } else if(memcmp(mbuf,magic,sizeof magic-1)) {
                            BIO_printf(bio_err,"bad magic number\n");
                            goto end;
                        }

                        sptr = salt;
                  }

                  EVP_BytesToKey(cipher,dgst,sptr,
                        (unsigned char *)str,
                        strlen(str),1,key,iv);
                  /* zero the complete buffer or the string
                   * passed from the command line
                   * bug picked up by
                   * Larry J. Hughes Jr. <hughes@indiana.edu> */
                  if (str == strbuf)
                        OPENSSL_cleanse(str,SIZE);
                  else
                        OPENSSL_cleanse(str,strlen(str));
                  }
            if ((hiv != NULL) && !set_hex(hiv,iv,sizeof iv))
                  {
                  BIO_printf(bio_err,"invalid hex iv value\n");
                  goto end;
                  }
            if ((hiv == NULL) && (str == NULL)
                && EVP_CIPHER_iv_length(cipher) != 0)
                  {
                  /* No IV was explicitly set and no IV was generated
                   * during EVP_BytesToKey. Hence the IV is undefined,
                   * making correct decryption impossible. */
                  BIO_printf(bio_err, "iv undefined\n");
                  goto end;
                  }
            if ((hkey != NULL) && !set_hex(hkey,key,sizeof key))
                  {
                  BIO_printf(bio_err,"invalid hex key value\n");
                  goto end;
                  }

            if ((benc=BIO_new(BIO_f_cipher())) == NULL)
                  goto end;

            /* Since we may be changing parameters work on the encryption
             * context rather than calling BIO_set_cipher().
             */

            BIO_get_cipher_ctx(benc, &ctx);
            if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, enc))
                  {
                  BIO_printf(bio_err, "Error setting cipher %s\n",
                        EVP_CIPHER_name(cipher));
                  ERR_print_errors(bio_err);
                  goto end;
                  }

            if (nopad)
                  EVP_CIPHER_CTX_set_padding(ctx, 0);

            if (!EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, enc))
                  {
                  BIO_printf(bio_err, "Error setting cipher %s\n",
                        EVP_CIPHER_name(cipher));
                  ERR_print_errors(bio_err);
                  goto end;
                  }

            if (debug)
                  {
                  BIO_set_callback(benc,BIO_debug_callback);
                  BIO_set_callback_arg(benc,(char *)bio_err);
                  }

            if (printkey)
                  {
                  if (!nosalt)
                        {
                        printf("salt=");
                        for (i=0; i<(int)sizeof(salt); i++)
                              printf("%02X",salt[i]);
                        printf("\n");
                        }
                  if (cipher->key_len > 0)
                        {
                        printf("key=");
                        for (i=0; i<cipher->key_len; i++)
                              printf("%02X",key[i]);
                        printf("\n");
                        }
                  if (cipher->iv_len > 0)
                        {
                        printf("iv =");
                        for (i=0; i<cipher->iv_len; i++)
                              printf("%02X",iv[i]);
                        printf("\n");
                        }
                  if (printkey == 2)
                        {
                        ret=0;
                        goto end;
                        }
                  }
            }

      /* Only encrypt/decrypt as we write the file */
      if (benc != NULL)
            wbio=BIO_push(benc,wbio);

      for (;;)
            {
            inl=BIO_read(rbio,(char *)buff,bsize);
            if (inl <= 0) break;
            if (BIO_write(wbio,(char *)buff,inl) != inl)
                  {
                  BIO_printf(bio_err,"error writing output file\n");
                  goto end;
                  }
            }
      if (!BIO_flush(wbio))
            {
            BIO_printf(bio_err,"bad decrypt\n");
            goto end;
            }

      ret=0;
      if (verbose)
            {
            BIO_printf(bio_err,"bytes read   :%8ld\n",BIO_number_read(in));
            BIO_printf(bio_err,"bytes written:%8ld\n",BIO_number_written(out));
            }
end:
      ERR_print_errors(bio_err);
      if (strbuf != NULL) OPENSSL_free(strbuf);
      if (buff != NULL) OPENSSL_free(buff);
      if (in != NULL) BIO_free(in);
      if (out != NULL) BIO_free_all(out);
      if (benc != NULL) BIO_free(benc);
      if (b64 != NULL) BIO_free(b64);
#ifdef ZLIB
      if (bzl != NULL) BIO_free(bzl);
#endif
      if(pass) OPENSSL_free(pass);
      apps_shutdown();
      OPENSSL_EXIT(ret);
      }

int set_hex(char *in, unsigned char *out, int size)
      {
      int i,n;
      unsigned char j;

      n=strlen(in);
      if (n > (size*2))
            {
            BIO_printf(bio_err,"hex string is too long\n");
            return(0);
            }
      memset(out,0,size);
      for (i=0; i<n; i++)
            {
            j=(unsigned char)*in;
            *(in++)='\0';
            if (j == 0) break;
            if ((j >= '0') && (j <= '9'))
                  j-='0';
            else if ((j >= 'A') && (j <= 'F'))
                  j=j-'A'+10;
            else if ((j >= 'a') && (j <= 'f'))
                  j=j-'a'+10;
            else
                  {
                  BIO_printf(bio_err,"non-hex digit\n");
                  return(0);
                  }
            if (i&1)
                  out[i/2]|=j;
            else
                  out[i/2]=(j<<4);
            }
      return(1);
      }

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