/* $OpenBSD: p12_key.c,v 1.31 2022/07/30 11:27:06 tb Exp $ */

/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL

 * project 1999.

 */

/* ====================================================================

 * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.

 *

 * 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 above 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 acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"

 *

 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

 *    endorse or promote products derived from this software without

 *    prior written permission. For written permission, please contact

 *    licensing@OpenSSL.org.

 *

 * 5. Products derived from this software may not be called "OpenSSL"

 *    nor may "OpenSSL" appear in their names without prior written

 *    permission of the OpenSSL Project.

 *

 * 6. Redistributions of any form whatsoever must retain the following

 *    acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"

 *

 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

 * EXPRESSED 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 OpenSSL PROJECT OR

 * ITS 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.

 * ====================================================================

 *

 * This product includes cryptographic software written by Eric Young

 * (eay@cryptsoft.com).  This product includes software written by Tim

 * Hudson (tjh@cryptsoft.com).

 *

 */

#include <stdio.h>

#include <string.h>

#include <openssl/bn.h>

#include <openssl/err.h>

#include <openssl/pkcs12.h>

#include "evp_locl.h"

/* PKCS12 compatible key/IV generation */

#ifndef min

#define min(a,b) ((a) < (b) ? (a) : (b))

#endif

int

PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt,

    int saltlen, int id, int iter, int n, unsigned char *out,

    const EVP_MD *md_type)

{

  int ret;

  unsigned char *unipass;

  int uniplen;

  if (!pass) {

    unipass = NULL;

    uniplen = 0;

  } else if (!OPENSSL_asc2uni(pass, passlen, &unipass, &uniplen)) {

    PKCS12error(ERR_R_MALLOC_FAILURE);

    return 0;

  }

  ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,

      id, iter, n, out, md_type);

  if (ret <= 0)

    return 0;

  freezero(unipass, uniplen);

  return ret;

}

int

PKCS12_key_gen_uni(unsigned char *pass, int passlen, unsigned char *salt,

    int saltlen, int id, int iter, int n, unsigned char *out,

    const EVP_MD *md_type)

{

  EVP_MD_CTX *ctx = NULL;

  unsigned char *B = NULL, *D = NULL, *I = NULL, *Ai = NULL;

  unsigned char *p;

  int Slen, Plen, Ilen;

  int i, j, u, v;

  int ret = 0;

  if ((ctx = EVP_MD_CTX_new()) == NULL)

    goto err;

  if ((v = EVP_MD_block_size(md_type)) <= 0)

    goto err;

  if ((u = EVP_MD_size(md_type)) <= 0)

    goto err;

  if ((D = malloc(v)) == NULL)

    goto err;

  if ((Ai = malloc(u)) == NULL)

    goto err;

  if ((B = malloc(v + 1)) == NULL)

    goto err;

  Slen = v * ((saltlen + v - 1) / v);

  Plen = 0;

  if (passlen)

    Plen = v * ((passlen + v - 1) / v);

  Ilen = Slen + Plen;

  if ((I = malloc(Ilen)) == NULL)

    goto err;

  for (i = 0; i < v; i++)

    D[i] = id;

  p = I;

  for (i = 0; i < Slen; i++)

    *p++ = salt[i % saltlen];

  for (i = 0; i < Plen; i++)

    *p++ = pass[i % passlen];

  for (;;) {

    if (!EVP_DigestInit_ex(ctx, md_type, NULL))

      goto err;

    if (!EVP_DigestUpdate(ctx, D, v))

      goto err;

    if (!EVP_DigestUpdate(ctx, I, Ilen))

      goto err;

    if (!EVP_DigestFinal_ex(ctx, Ai, NULL))

      goto err;

    for (j = 1; j < iter; j++) {

      if (!EVP_DigestInit_ex(ctx, md_type, NULL))

        goto err;

      if (!EVP_DigestUpdate(ctx, Ai, u))

        goto err;

      if (!EVP_DigestFinal_ex(ctx, Ai, NULL))

        goto err;

    }

    memcpy(out, Ai, min(n, u));

    if (u >= n) {

      ret = 1;

      goto end;

    }

    n -= u;

    out += u;

    for (j = 0; j < v; j++)

      B[j] = Ai[j % u];

    for (j = 0; j < Ilen; j += v) {

      uint16_t c = 1;

      int k;

      /* Work out I[j] = I[j] + B + 1. */

      for (k = v - 1; k >= 0; k--) {

        c += I[j + k] + B[k];

        I[j + k] = (unsigned char)c;

        c >>= 8;

      }

    }

  }

 err:

  PKCS12error(ERR_R_MALLOC_FAILURE);

 end:

  free(Ai);

  free(B);

  free(D);

  free(I);

  EVP_MD_CTX_free(ctx);

  return ret;

}