text: /*
   * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the OpenSSL license (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 "internal/cryptlib.h"
  #include <openssl/evp.h>
  #include <openssl/pkcs12.h>
  #include <openssl/x509.h>
  #include "evp_locl.h"
  
  /* Password based encryption (PBE) functions */
  
  /* Setup a cipher context from a PBE algorithm */
  
  struct evp_pbe_st {
      int pbe_type;
      int pbe_nid;
      int cipher_nid;
      int md_nid;
      EVP_PBE_KEYGEN *keygen;
  };
  
  static STACK_OF(EVP_PBE_CTL) *pbe_algs;
  
  static const EVP_PBE_CTL builtin_pbe[] = {
      {EVP_PBE_TYPE_OUTER, NID_pbeWithMD2AndDES_CBC,
       NID_des_cbc, NID_md2, PKCS5_PBE_keyivgen},
      {EVP_PBE_TYPE_OUTER, NID_pbeWithMD5AndDES_CBC,
       NID_des_cbc, NID_md5, PKCS5_PBE_keyivgen},
      {EVP_PBE_TYPE_OUTER, NID_pbeWithSHA1AndRC2_CBC,
       NID_rc2_64_cbc, NID_sha1, PKCS5_PBE_keyivgen},
  
      {EVP_PBE_TYPE_OUTER, NID_id_pbkdf2, -1, -1, PKCS5_v2_PBKDF2_keyivgen},
  
      {EVP_PBE_TYPE_OUTER, NID_pbe_WithSHA1And128BitRC4,
       NID_rc4, NID_sha1, PKCS12_PBE_keyivgen},
      {EVP_PBE_TYPE_OUTER, NID_pbe_WithSHA1And40BitRC4,
       NID_rc4_40, NID_sha1, PKCS12_PBE_keyivgen},
      {EVP_PBE_TYPE_OUTER, NID_pbe_WithSHA1And3_Key_TripleDES_CBC,
       NID_des_ede3_cbc, NID_sha1, PKCS12_PBE_keyivgen},
      {EVP_PBE_TYPE_OUTER, NID_pbe_WithSHA1And2_Key_TripleDES_CBC,
       NID_des_ede_cbc, NID_sha1, PKCS12_PBE_keyivgen},
      {EVP_PBE_TYPE_OUTER, NID_pbe_WithSHA1And128BitRC2_CBC,
       NID_rc2_cbc, NID_sha1, PKCS12_PBE_keyivgen},
      {EVP_PBE_TYPE_OUTER, NID_pbe_WithSHA1And40BitRC2_CBC,
       NID_rc2_40_cbc, NID_sha1, PKCS12_PBE_keyivgen},
  
      {EVP_PBE_TYPE_OUTER, NID_pbes2, -1, -1, PKCS5_v2_PBE_keyivgen},
  
      {EVP_PBE_TYPE_OUTER, NID_pbeWithMD2AndRC2_CBC,
       NID_rc2_64_cbc, NID_md2, PKCS5_PBE_keyivgen},
      {EVP_PBE_TYPE_OUTER, NID_pbeWithMD5AndRC2_CBC,
       NID_rc2_64_cbc, NID_md5, PKCS5_PBE_keyivgen},
      {EVP_PBE_TYPE_OUTER, NID_pbeWithSHA1AndDES_CBC,
       NID_des_cbc, NID_sha1, PKCS5_PBE_keyivgen},
  
      {EVP_PBE_TYPE_PRF, NID_hmacWithSHA1, -1, NID_sha1, 0},
      {EVP_PBE_TYPE_PRF, NID_hmacWithMD5, -1, NID_md5, 0},
      {EVP_PBE_TYPE_PRF, NID_hmacWithSHA224, -1, NID_sha224, 0},
      {EVP_PBE_TYPE_PRF, NID_hmacWithSHA256, -1, NID_sha256, 0},
      {EVP_PBE_TYPE_PRF, NID_hmacWithSHA384, -1, NID_sha384, 0},
      {EVP_PBE_TYPE_PRF, NID_hmacWithSHA512, -1, NID_sha512, 0},
      {EVP_PBE_TYPE_PRF, NID_id_HMACGostR3411_94, -1, NID_id_GostR3411_94, 0},
      {EVP_PBE_TYPE_PRF, NID_id_tc26_hmac_gost_3411_2012_256, -1,
       NID_id_GostR3411_2012_256, 0},
      {EVP_PBE_TYPE_PRF, NID_id_tc26_hmac_gost_3411_2012_512, -1,
       NID_id_GostR3411_2012_512, 0},
      {EVP_PBE_TYPE_KDF, NID_id_pbkdf2, -1, -1, PKCS5_v2_PBKDF2_keyivgen},
  #ifndef OPENSSL_NO_SCRYPT
      {EVP_PBE_TYPE_KDF, NID_id_scrypt, -1, -1, PKCS5_v2_scrypt_keyivgen}
  #endif
  };
  
  int EVP_PBE_CipherInit(ASN1_OBJECT *pbe_obj, const char *pass, int passlen,
                         ASN1_TYPE *param, EVP_CIPHER_CTX *ctx, int en_de)
  {
      const EVP_CIPHER *cipher;
      const EVP_MD *md;
      int cipher_nid, md_nid;
      EVP_PBE_KEYGEN *keygen;
  
      if (!EVP_PBE_find(EVP_PBE_TYPE_OUTER, OBJ_obj2nid(pbe_obj),
                        &cipher_nid, &md_nid, &keygen)) {
          char obj_tmp[80];
          EVPerr(EVP_F_EVP_PBE_CIPHERINIT, EVP_R_UNKNOWN_PBE_ALGORITHM);
          if (!pbe_obj)
              strcpy(obj_tmp, "NULL");
          else
              i2t_ASN1_OBJECT(obj_tmp, sizeof obj_tmp, pbe_obj);
          ERR_add_error_data(2, "TYPE=", obj_tmp);
          return 0;
      }
  
      if (!pass)
          passlen = 0;
      else if (passlen == -1)
          passlen = strlen(pass);
  
      if (cipher_nid == -1)
          cipher = NULL;
      else {
          cipher = EVP_get_cipherbynid(cipher_nid);
          if (!cipher) {
              EVPerr(EVP_F_EVP_PBE_CIPHERINIT, EVP_R_UNKNOWN_CIPHER);
              return 0;
          }
      }
  
      if (md_nid == -1)
          md = NULL;
      else {
          md = EVP_get_digestbynid(md_nid);
          if (!md) {
              EVPerr(EVP_F_EVP_PBE_CIPHERINIT, EVP_R_UNKNOWN_DIGEST);
              return 0;
          }
      }
  
      if (!keygen(ctx, pass, passlen, param, cipher, md, en_de)) {
          EVPerr(EVP_F_EVP_PBE_CIPHERINIT, EVP_R_KEYGEN_FAILURE);
          return 0;
      }
      return 1;
  }
  
  DECLARE_OBJ_BSEARCH_CMP_FN(EVP_PBE_CTL, EVP_PBE_CTL, pbe2);
  
  static int pbe2_cmp(const EVP_PBE_CTL *pbe1, const EVP_PBE_CTL *pbe2)
  {
      int ret = pbe1->pbe_type - pbe2->pbe_type;
      if (ret)
          return ret;
      else
          return pbe1->pbe_nid - pbe2->pbe_nid;
  }
  
  IMPLEMENT_OBJ_BSEARCH_CMP_FN(EVP_PBE_CTL, EVP_PBE_CTL, pbe2);
  
  static int pbe_cmp(const EVP_PBE_CTL *const *a, const EVP_PBE_CTL *const *b)
  {
      int ret = (*a)->pbe_type - (*b)->pbe_type;
      if (ret)
          return ret;
      else
          return (*a)->pbe_nid - (*b)->pbe_nid;
  }
  
  /* Add a PBE algorithm */
  
  int EVP_PBE_alg_add_type(int pbe_type, int pbe_nid, int cipher_nid,
                           int md_nid, EVP_PBE_KEYGEN *keygen)
  {
      EVP_PBE_CTL *pbe_tmp;
  
      if (pbe_algs == NULL) {
          pbe_algs = sk_EVP_PBE_CTL_new(pbe_cmp);
          if (pbe_algs == NULL)
              goto err;
      }
  
      if ((pbe_tmp = OPENSSL_malloc(sizeof(*pbe_tmp))) == NULL)
          goto err;
  
      pbe_tmp->pbe_type = pbe_type;
      pbe_tmp->pbe_nid = pbe_nid;
      pbe_tmp->cipher_nid = cipher_nid;
      pbe_tmp->md_nid = md_nid;
      pbe_tmp->keygen = keygen;
  
      if (!sk_EVP_PBE_CTL_push(pbe_algs, pbe_tmp)) {
          OPENSSL_free(pbe_tmp);
          goto err;
      }
      return 1;
  
   err:
      EVPerr(EVP_F_EVP_PBE_ALG_ADD_TYPE, ERR_R_MALLOC_FAILURE);
      return 0;
  }
  
  int EVP_PBE_alg_add(int nid, const EVP_CIPHER *cipher, const EVP_MD *md,
                      EVP_PBE_KEYGEN *keygen)
  {
      int cipher_nid, md_nid;
  
      if (cipher)
          cipher_nid = EVP_CIPHER_nid(cipher);
      else
          cipher_nid = -1;
      if (md)
          md_nid = EVP_MD_type(md);
      else
          md_nid = -1;
  
      return EVP_PBE_alg_add_type(EVP_PBE_TYPE_OUTER, nid,
                                  cipher_nid, md_nid, keygen);
  }
  
  int EVP_PBE_find(int type, int pbe_nid,
                   int *pcnid, int *pmnid, EVP_PBE_KEYGEN **pkeygen)
  {
      EVP_PBE_CTL *pbetmp = NULL, pbelu;
      int i;
      if (pbe_nid == NID_undef)
          return 0;
  
      pbelu.pbe_type = type;
      pbelu.pbe_nid = pbe_nid;
  
      if (pbe_algs) {
          i = sk_EVP_PBE_CTL_find(pbe_algs, &pbelu);
          if (i != -1)
              pbetmp = sk_EVP_PBE_CTL_value(pbe_algs, i);
      }
      if (pbetmp == NULL) {
          pbetmp = OBJ_bsearch_pbe2(&pbelu, builtin_pbe, OSSL_NELEM(builtin_pbe));
      }
      if (pbetmp == NULL)
          return 0;
      if (pcnid)
          *pcnid = pbetmp->cipher_nid;
      if (pmnid)
          *pmnid = pbetmp->md_nid;
      if (pkeygen)
          *pkeygen = pbetmp->keygen;
      return 1;
  }
  
  static void free_evp_pbe_ctl(EVP_PBE_CTL *pbe)
  {
      OPENSSL_free(pbe);
  }
  
  void EVP_PBE_cleanup(void)
  {
      sk_EVP_PBE_CTL_pop_free(pbe_algs, free_evp_pbe_ctl);
      pbe_algs = NULL;
  }
  
  int EVP_PBE_get(int *ptype, int *ppbe_nid, size_t num)
  {
      const EVP_PBE_CTL *tpbe;
  
      if (num >= OSSL_NELEM(builtin_pbe))
          return 0;
  
      tpbe = builtin_pbe + num;
      if (ptype)
          *ptype = tpbe->pbe_type;
      if (ppbe_nid)
          *ppbe_nid = tpbe->pbe_nid;
      return 1;
  }
  