text: /*
   * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the Apache License 2.0 (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <limits.h>
  #include "apps.h"
  #include "progs.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>
  #ifndef OPENSSL_NO_COMP
  # include <openssl/comp.h>
  #endif
  #include <ctype.h>
  
  #undef SIZE
  #undef BSIZE
  #define SIZE    (512)
  #define BSIZE   (8*1024)
  
  static int set_hex(const char *in, unsigned char *out, int size);
  static void show_ciphers(const OBJ_NAME *name, void *bio_);
  
  struct doall_enc_ciphers {
      BIO *bio;
      int n;
  };
  
  typedef enum OPTION_choice {
      OPT_COMMON,
      OPT_LIST,
      OPT_E, OPT_IN, OPT_OUT, OPT_PASS, OPT_ENGINE, OPT_D, OPT_P, OPT_V,
      OPT_NOPAD, OPT_SALT, OPT_NOSALT, OPT_DEBUG, OPT_UPPER_P, OPT_UPPER_A,
      OPT_A, OPT_Z, OPT_BUFSIZE, OPT_K, OPT_KFILE, OPT_UPPER_K, OPT_NONE,
      OPT_UPPER_S, OPT_IV, OPT_MD, OPT_ITER, OPT_PBKDF2, OPT_CIPHER,
      OPT_R_ENUM, OPT_PROV_ENUM
  } OPTION_CHOICE;
  
  const OPTIONS enc_options[] = {
      OPT_SECTION("General"),
      {"help", OPT_HELP, '-', "Display this summary"},
      {"list", OPT_LIST, '-', "List ciphers"},
  #ifndef OPENSSL_NO_DEPRECATED_3_0
      {"ciphers", OPT_LIST, '-', "Alias for -list"},
  #endif
      {"e", OPT_E, '-', "Encrypt"},
      {"d", OPT_D, '-', "Decrypt"},
      {"p", OPT_P, '-', "Print the iv/key"},
      {"P", OPT_UPPER_P, '-', "Print the iv/key and exit"},
  #ifndef OPENSSL_NO_ENGINE
      {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  #endif
  
      OPT_SECTION("Input"),
      {"in", OPT_IN, '<', "Input file"},
      {"k", OPT_K, 's', "Passphrase"},
      {"kfile", OPT_KFILE, '<', "Read passphrase from file"},
  
      OPT_SECTION("Output"),
      {"out", OPT_OUT, '>', "Output file"},
      {"pass", OPT_PASS, 's', "Passphrase source"},
      {"v", OPT_V, '-', "Verbose output"},
      {"a", OPT_A, '-', "Base64 encode/decode, depending on encryption flag"},
      {"base64", OPT_A, '-', "Same as option -a"},
      {"A", OPT_UPPER_A, '-',
       "Used with -[base64|a] to specify base64 buffer as a single line"},
  
      OPT_SECTION("Encryption"),
      {"nopad", OPT_NOPAD, '-', "Disable standard block padding"},
      {"salt", OPT_SALT, '-', "Use salt in the KDF (default)"},
      {"nosalt", OPT_NOSALT, '-', "Do not use salt in the KDF"},
      {"debug", OPT_DEBUG, '-', "Print debug info"},
  
      {"bufsize", OPT_BUFSIZE, 's', "Buffer size"},
      {"K", OPT_UPPER_K, 's', "Raw key, in hex"},
      {"S", OPT_UPPER_S, 's', "Salt, in hex"},
      {"iv", OPT_IV, 's', "IV in hex"},
      {"md", OPT_MD, 's', "Use specified digest to create a key from the passphrase"},
      {"iter", OPT_ITER, 'p', "Specify the iteration count and force use of PBKDF2"},
      {"pbkdf2", OPT_PBKDF2, '-', "Use password-based key derivation function 2"},
      {"none", OPT_NONE, '-', "Don't encrypt"},
  #ifdef ZLIB
      {"z", OPT_Z, '-', "Compress or decompress encrypted data using zlib"},
  #endif
      {"", OPT_CIPHER, '-', "Any supported cipher"},
  
      OPT_R_OPTIONS,
      OPT_PROV_OPTIONS,
      {NULL}
  };
  
  int enc_main(int argc, char **argv)
  {
      static char buf[128];
      static const char magic[] = "Salted__";
      ENGINE *e = NULL;
      BIO *in = NULL, *out = NULL, *b64 = NULL, *benc = NULL, *rbio =
          NULL, *wbio = NULL;
      EVP_CIPHER_CTX *ctx = NULL;
      EVP_CIPHER *cipher = NULL;
      EVP_MD *dgst = NULL;
      const char *digestname = NULL;
      char *hkey = NULL, *hiv = NULL, *hsalt = NULL, *p;
      char *infile = NULL, *outfile = NULL, *prog;
      char *str = NULL, *passarg = NULL, *pass = NULL, *strbuf = NULL;
      const char *ciphername = NULL;
      char mbuf[sizeof(magic) - 1];
      OPTION_CHOICE o;
      int bsize = BSIZE, verbose = 0, debug = 0, olb64 = 0, nosalt = 0;
      int enc = 1, printkey = 0, i, k;
      int base64 = 0, informat = FORMAT_BINARY, outformat = FORMAT_BINARY;
      int ret = 1, inl, nopad = 0;
      unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];
      unsigned char *buff = NULL, salt[PKCS5_SALT_LEN];
      int pbkdf2 = 0;
      int iter = 0;
      long n;
      struct doall_enc_ciphers dec;
  #ifdef ZLIB
      int do_zlib = 0;
      BIO *bzl = NULL;
  #endif
  
      /* first check the command name */
      if (strcmp(argv[0], "base64") == 0)
          base64 = 1;
  #ifdef ZLIB
      else if (strcmp(argv[0], "zlib") == 0)
          do_zlib = 1;
  #endif
      else if (strcmp(argv[0], "enc") != 0)
          ciphername = argv[0];
  
      prog = opt_init(argc, argv, enc_options);
      while ((o = opt_next()) != OPT_EOF) {
          switch (o) {
          case OPT_EOF:
          case OPT_ERR:
   opthelp:
              BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
              goto end;
          case OPT_HELP:
              opt_help(enc_options);
              ret = 0;
              goto end;
          case OPT_LIST:
              BIO_printf(bio_out, "Supported ciphers:\n");
              dec.bio = bio_out;
              dec.n = 0;
              OBJ_NAME_do_all_sorted(OBJ_NAME_TYPE_CIPHER_METH,
                                     show_ciphers, &dec);
              BIO_printf(bio_out, "\n");
              ret = 0;
              goto end;
          case OPT_E:
              enc = 1;
              break;
          case OPT_IN:
              infile = opt_arg();
              break;
          case OPT_OUT:
              outfile = opt_arg();
              break;
          case OPT_PASS:
              passarg = opt_arg();
              break;
          case OPT_ENGINE:
              e = setup_engine(opt_arg(), 0);
              break;
          case OPT_D:
              enc = 0;
              break;
          case OPT_P:
              printkey = 1;
              break;
          case OPT_V:
              verbose = 1;
              break;
          case OPT_NOPAD:
              nopad = 1;
              break;
          case OPT_SALT:
              nosalt = 0;
              break;
          case OPT_NOSALT:
              nosalt = 1;
              break;
          case OPT_DEBUG:
              debug = 1;
              break;
          case OPT_UPPER_P:
              printkey = 2;
              break;
          case OPT_UPPER_A:
              olb64 = 1;
              break;
          case OPT_A:
              base64 = 1;
              break;
          case OPT_Z:
  #ifdef ZLIB
              do_zlib = 1;
  #endif
              break;
          case OPT_BUFSIZE:
              p = opt_arg();
              i = (int)strlen(p) - 1;
              k = i >= 1 && p[i] == 'k';
              if (k)
                  p[i] = '\0';
              if (!opt_long(opt_arg(), &n)
                      || n < 0 || (k && n >= LONG_MAX / 1024))
                  goto opthelp;
              if (k)
                  n *= 1024;
              bsize = (int)n;
              break;
          case OPT_K:
              str = opt_arg();
              break;
          case OPT_KFILE:
              in = bio_open_default(opt_arg(), 'r', FORMAT_TEXT);
              if (in == NULL)
                  goto opthelp;
              i = BIO_gets(in, buf, sizeof(buf));
              BIO_free(in);
              in = NULL;
              if (i <= 0) {
                  BIO_printf(bio_err,
                             "%s Can't read key from %s\n", prog, opt_arg());
                  goto opthelp;
              }
              while (--i > 0 && (buf[i] == '\r' || buf[i] == '\n'))
                  buf[i] = '\0';
              if (i <= 0) {
                  BIO_printf(bio_err, "%s: zero length password\n", prog);
                  goto opthelp;
              }
              str = buf;
              break;
          case OPT_UPPER_K:
              hkey = opt_arg();
              break;
          case OPT_UPPER_S:
              hsalt = opt_arg();
              break;
          case OPT_IV:
              hiv = opt_arg();
              break;
          case OPT_MD:
              digestname = opt_arg();
              break;
          case OPT_CIPHER:
              ciphername = opt_unknown();
              break;
          case OPT_ITER:
              iter = opt_int_arg();
              pbkdf2 = 1;
              break;
          case OPT_PBKDF2:
              pbkdf2 = 1;
              if (iter == 0)    /* do not overwrite a chosen value */
                  iter = 10000;
              break;
          case OPT_NONE:
              cipher = NULL;
              break;
          case OPT_R_CASES:
              if (!opt_rand(o))
                  goto end;
              break;
          case OPT_PROV_CASES:
              if (!opt_provider(o))
                  goto end;
              break;
          }
      }
  
      /* No extra arguments. */
      argc = opt_num_rest();
      if (argc != 0)
          goto opthelp;
      if (!app_RAND_load())
          goto end;
  
      /* Get the cipher name, either from progname (if set) or flag. */
      if (ciphername != NULL) {
          if (!opt_cipher(ciphername, &cipher))
              goto opthelp;
      }
      if (cipher && EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) {
          BIO_printf(bio_err, "%s: AEAD ciphers not supported\n", prog);
          goto end;
      }
      if (cipher && (EVP_CIPHER_mode(cipher) == EVP_CIPH_XTS_MODE)) {
          BIO_printf(bio_err, "%s XTS ciphers not supported\n", prog);
          goto end;
      }
      if (digestname != NULL) {
          if (!opt_md(digestname, &dgst))
              goto opthelp;
      }
      if (dgst == NULL)
          dgst = (EVP_MD *)EVP_sha256();
  
      if (iter == 0)
          iter = 1;
  
      /* It must be large enough for a base64 encoded line */
      if (base64 && bsize < 80)
          bsize = 80;
      if (verbose)
          BIO_printf(bio_err, "bufsize=%d\n", bsize);
  
  #ifdef ZLIB
      if (!do_zlib)
  #endif
          if (base64) {
              if (enc)
                  outformat = FORMAT_BASE64;
              else
                  informat = FORMAT_BASE64;
          }
  
      strbuf = app_malloc(SIZE, "strbuf");
      buff = app_malloc(EVP_ENCODE_LENGTH(bsize), "evp buffer");
  
      if (infile == NULL) {
          in = dup_bio_in(informat);
      } else {
          in = bio_open_default(infile, 'r', informat);
      }
      if (in == NULL)
          goto end;
  
      if (str == NULL && passarg != NULL) {
          if (!app_passwd(passarg, NULL, &pass, NULL)) {
              BIO_printf(bio_err, "Error getting password\n");
              goto end;
          }
          str = pass;
      }
  
      if ((str == NULL) && (cipher != NULL) && (hkey == NULL)) {
          if (1) {
  #ifndef OPENSSL_NO_UI_CONSOLE
              for (;;) {
                  char prompt[200];
  
                  BIO_snprintf(prompt, sizeof(prompt), "enter %s %s password:",
                          EVP_CIPHER_name(cipher),
                          (enc) ? "encryption" : "decryption");
                  strbuf[0] = '\0';
                  i = EVP_read_pw_string((char *)strbuf, SIZE, prompt, 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;
                  }
              }
          } else {
  #endif
              BIO_printf(bio_err, "password required\n");
              goto end;
          }
      }
  
      out = bio_open_default(outfile, 'w', outformat);
      if (out == NULL)
          goto end;
  
      if (debug) {
          BIO_set_callback_ex(in, BIO_debug_callback_ex);
          BIO_set_callback_ex(out, BIO_debug_callback_ex);
          BIO_set_callback_arg(in, (char *)bio_err);
          BIO_set_callback_arg(out, (char *)bio_err);
      }
  
      rbio = in;
      wbio = out;
  
  #ifdef ZLIB
      if (do_zlib) {
          if ((bzl = BIO_new(BIO_f_zlib())) == NULL)
              goto end;
          if (debug) {
              BIO_set_callback_ex(bzl, BIO_debug_callback_ex);
              BIO_set_callback_arg(bzl, (char *)bio_err);
          }
          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_ex(b64, BIO_debug_callback_ex);
              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) {
          if (str != NULL) { /* a passphrase is available */
              /*
               * Salt handling: if encrypting generate a salt if not supplied,
               * and write to output BIO. If decrypting use salt from input BIO
               * if not given with args
               */
              unsigned char *sptr;
              size_t str_len = strlen(str);
  
              if (nosalt) {
                  sptr = NULL;
              } else {
                  if (hsalt != NULL && !set_hex(hsalt, salt, sizeof(salt))) {
                      BIO_printf(bio_err, "invalid hex salt value\n");
                      goto end;
                  }
                  if (enc) {  /* encryption */
                      if (hsalt == NULL) {
                          if (RAND_bytes(salt, sizeof(salt)) <= 0) {
                              BIO_printf(bio_err, "RAND_bytes failed\n");
                              goto end;
                          }
                          /*
                           * If -P option then don't bother writing.
                           * If salt is given, shouldn't either ?
                           */
                          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 {    /* decryption */
                      if (hsalt == NULL) {
                          if (BIO_read(rbio, mbuf, sizeof(mbuf)) != sizeof(mbuf)) {
                              BIO_printf(bio_err, "error reading input file\n");
                              goto end;
                          }
                          if (memcmp(mbuf, magic, sizeof(mbuf)) == 0) { /* file IS salted */
                              if (BIO_read(rbio, salt,
                                           sizeof(salt)) != sizeof(salt)) {
                                  BIO_printf(bio_err, "error reading input file\n");
                                  goto end;
                              }
                          } else { /* file is NOT salted, NO salt available */
                              BIO_printf(bio_err, "bad magic number\n");
                              goto end;
                          }
                      }
                  }
                  sptr = salt;
              }
  
              if (pbkdf2 == 1) {
                  /*
                  * derive key and default iv
                  * concatenated into a temporary buffer
                  */
                  unsigned char tmpkeyiv[EVP_MAX_KEY_LENGTH + EVP_MAX_IV_LENGTH];
                  int iklen = EVP_CIPHER_key_length(cipher);
                  int ivlen = EVP_CIPHER_iv_length(cipher);
                  /* not needed if HASH_UPDATE() is fixed : */
                  int islen = (sptr != NULL ? sizeof(salt) : 0);
                  if (!PKCS5_PBKDF2_HMAC(str, str_len, sptr, islen,
                                         iter, dgst, iklen+ivlen, tmpkeyiv)) {
                      BIO_printf(bio_err, "PKCS5_PBKDF2_HMAC failed\n");
                      goto end;
                  }
                  /* split and move data back to global buffer */
                  memcpy(key, tmpkeyiv, iklen);
                  memcpy(iv, tmpkeyiv+iklen, ivlen);
              } else {
                  BIO_printf(bio_err, "*** WARNING : "
                                      "deprecated key derivation used.\n"
                                      "Using -iter or -pbkdf2 would be better.\n");
                  if (!EVP_BytesToKey(cipher, dgst, sptr,
                                      (unsigned char *)str, str_len,
                                      1, key, iv)) {
                      BIO_printf(bio_err, "EVP_BytesToKey failed\n");
                      goto end;
                  }
              }
              /*
               * zero the complete buffer or the string passed from the command
               * line.
               */
              if (str == strbuf)
                  OPENSSL_cleanse(str, SIZE);
              else
                  OPENSSL_cleanse(str, str_len);
          }
          if (hiv != NULL) {
              int siz = EVP_CIPHER_iv_length(cipher);
              if (siz == 0) {
                  BIO_printf(bio_err, "warning: iv not used by this cipher\n");
              } else if (!set_hex(hiv, iv, siz)) {
                  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.
               * Hence the IV is undefined, making correct decryption impossible.
               */
              BIO_printf(bio_err, "iv undefined\n");
              goto end;
          }
          if (hkey != NULL) {
              if (!set_hex(hkey, key, EVP_CIPHER_key_length(cipher))) {
                  BIO_printf(bio_err, "invalid hex key value\n");
                  goto end;
              }
              /* wiping secret data as we no longer need it */
              cleanse(hkey);
          }
  
          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, e, 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_ex(benc, BIO_debug_callback_ex);
              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 (EVP_CIPHER_key_length(cipher) > 0) {
                  printf("key=");
                  for (i = 0; i < EVP_CIPHER_key_length(cipher); i++)
                      printf("%02X", key[i]);
                  printf("\n");
              }
              if (EVP_CIPHER_iv_length(cipher) > 0) {
                  printf("iv =");
                  for (i = 0; i < EVP_CIPHER_iv_length(cipher); 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);
  
      while (BIO_pending(rbio) || !BIO_eof(rbio)) {
          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   : %8ju\n", BIO_number_read(in));
          BIO_printf(bio_err, "bytes written: %8ju\n", BIO_number_written(out));
      }
   end:
      ERR_print_errors(bio_err);
      OPENSSL_free(strbuf);
      OPENSSL_free(buff);
      BIO_free(in);
      BIO_free_all(out);
      BIO_free(benc);
      BIO_free(b64);
      EVP_MD_free(dgst);
      EVP_CIPHER_free(cipher);
  #ifdef ZLIB
      BIO_free(bzl);
  #endif
      release_engine(e);
      OPENSSL_free(pass);
      return ret;
  }
  
  static void show_ciphers(const OBJ_NAME *name, void *arg)
  {
      struct doall_enc_ciphers *dec = (struct doall_enc_ciphers *)arg;
      const EVP_CIPHER *cipher;
  
      if (!islower((unsigned char)*name->name))
          return;
  
      /* Filter out ciphers that we cannot use */
      cipher = EVP_get_cipherbyname(name->name);
      if (cipher == NULL ||
              (EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) != 0 ||
              EVP_CIPHER_mode(cipher) == EVP_CIPH_XTS_MODE)
          return;
  
      BIO_printf(dec->bio, "-%-25s", name->name);
      if (++dec->n == 3) {
          BIO_printf(dec->bio, "\n");
          dec->n = 0;
      } else
          BIO_printf(dec->bio, " ");
  }
  
  static int set_hex(const char *in, unsigned char *out, int size)
  {
      int i, n;
      unsigned char j;
  
      i = size * 2;
      n = strlen(in);
      if (n > i) {
          BIO_printf(bio_err, "hex string is too long, ignoring excess\n");
          n = i; /* ignore exceeding part */
      } else if (n < i) {
          BIO_printf(bio_err, "hex string is too short, padding with zero bytes to length\n");
      }
  
      memset(out, 0, size);
      for (i = 0; i < n; i++) {
          j = (unsigned char)*in++;
          if (!isxdigit(j)) {
              BIO_printf(bio_err, "non-hex digit\n");
              return 0;
          }
          j = (unsigned char)OPENSSL_hexchar2int(j);
          if (i & 1)
              out[i / 2] |= j;
          else
              out[i / 2] = (j << 4);
      }
      return 1;
  }
  