/* $OpenBSD: evp_key.c,v 1.27 2021/12/12 21:30:13 tb Exp $ */

/* 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 <string.h>

#include <openssl/err.h>

#include <openssl/evp.h>

#include <openssl/objects.h>

#include <openssl/ui.h>

#include <openssl/x509.h>

#include "evp_locl.h"

/* should be init to zeros. */

static char prompt_string[80];

void

EVP_set_pw_prompt(const char *prompt)

{

  if (prompt == NULL)

    prompt_string[0] = '\0';

  else {

    strlcpy(prompt_string, prompt, sizeof(prompt_string));

  }

}

char *

EVP_get_pw_prompt(void)

{

  if (prompt_string[0] == '\0')

    return (NULL);

  else

    return (prompt_string);

}

int

EVP_read_pw_string(char *buf, int len, const char *prompt, int verify)

{

  return EVP_read_pw_string_min(buf, 0, len, prompt, verify);

}

int

EVP_read_pw_string_min(char *buf, int min, int len, const char *prompt,

    int verify)

{

  int ret;

  char buff[BUFSIZ];

  UI *ui;

  if (len > BUFSIZ)

    len = BUFSIZ;

  /* Ensure that 0 <= min <= len - 1. In particular, 1 <= len. */

  if (min < 0 || len - 1 < min)

    return -1;

  if ((prompt == NULL) && (prompt_string[0] != '\0'))

    prompt = prompt_string;

  ui = UI_new();

  if (ui == NULL)

    return -1;

  if (UI_add_input_string(ui, prompt, 0, buf, min, len - 1) < 0)

    return -1;

  if (verify) {

    if (UI_add_verify_string(ui, prompt, 0, buff, min, len - 1, buf)

        < 0)

      return -1;

  }

  ret = UI_process(ui);

  UI_free(ui);

  explicit_bzero(buff, BUFSIZ);

  return ret;

}

int

EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md,

    const unsigned char *salt, const unsigned char *data, int datal,

    int count, unsigned char *key, unsigned char *iv)

{

  EVP_MD_CTX c;

  unsigned char md_buf[EVP_MAX_MD_SIZE];

  int niv, nkey, addmd = 0;

  unsigned int mds = 0, i;

  int rv = 0;

  nkey = type->key_len;

  niv = type->iv_len;

  if ((size_t)nkey > EVP_MAX_KEY_LENGTH) {

    EVPerror(EVP_R_BAD_KEY_LENGTH);

    return 0;

  }

  if ((size_t)niv > EVP_MAX_IV_LENGTH) {

    EVPerror(EVP_R_IV_TOO_LARGE);

    return 0;

  }

  if (data == NULL)

    return (nkey);

  EVP_MD_CTX_init(&c);

  for (;;) {

    if (!EVP_DigestInit_ex(&c, md, NULL))

      goto err;

    if (addmd++)

      if (!EVP_DigestUpdate(&c, &(md_buf[0]), mds))

        goto err;

    if (!EVP_DigestUpdate(&c, data, datal))

      goto err;

    if (salt != NULL)

      if (!EVP_DigestUpdate(&c, salt, PKCS5_SALT_LEN))

        goto err;

    if (!EVP_DigestFinal_ex(&c, &(md_buf[0]), &mds))

      goto err;

    for (i = 1; i < (unsigned int)count; i++) {

      if (!EVP_DigestInit_ex(&c, md, NULL))

        goto err;

      if (!EVP_DigestUpdate(&c, &(md_buf[0]), mds))

        goto err;

      if (!EVP_DigestFinal_ex(&c, &(md_buf[0]), &mds))

        goto err;

    }

    i = 0;

    if (nkey) {

      for (;;) {

        if (nkey == 0)

          break;

        if (i == mds)

          break;

        if (key != NULL)

          *(key++) = md_buf[i];

        nkey--;

        i++;

      }

    }

    if (niv && (i != mds)) {

      for (;;) {

        if (niv == 0)

          break;

        if (i == mds)

          break;

        if (iv != NULL)

          *(iv++) = md_buf[i];

        niv--;

        i++;

      }

    }

    if ((nkey == 0) && (niv == 0))

      break;

  }

  rv = type->key_len;

err:

  EVP_MD_CTX_cleanup(&c);

  explicit_bzero(md_buf, sizeof md_buf);

  return rv;

}