/* $OpenBSD: e_rc2.c,v 1.14 2022/01/20 11:31:37 inoguchi 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 <openssl/opensslconf.h>

#ifndef OPENSSL_NO_RC2

#include <openssl/err.h>

#include <openssl/evp.h>

#include <openssl/objects.h>

#include <openssl/rc2.h>

#include "evp_locl.h"

static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

    const unsigned char *iv, int enc);

static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx);

static int rc2_magic_to_meth(int i);

static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);

static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);

static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);

typedef struct {

  int key_bits; /* effective key bits */

  RC2_KEY ks; /* key schedule */

} EVP_RC2_KEY;

#define data(ctx) ((EVP_RC2_KEY *)(ctx)->cipher_data)

IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2,

    8,

    RC2_KEY_LENGTH, 8, 64,

    EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,

    rc2_init_key, NULL,

    rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv,

    rc2_ctrl)

#define RC2_40_MAGIC  0xa0

#define RC2_64_MAGIC  0x78

#define RC2_128_MAGIC 0x3a

static const EVP_CIPHER r2_64_cbc_cipher = {

  NID_rc2_64_cbc,

  8, 8 /* 64 bit */, 8,

  EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,

  rc2_init_key,

  rc2_cbc_cipher,

  NULL,

  sizeof(EVP_RC2_KEY),

  rc2_set_asn1_type_and_iv,

  rc2_get_asn1_type_and_iv,

  rc2_ctrl,

  NULL

};

static const EVP_CIPHER r2_40_cbc_cipher = {

  NID_rc2_40_cbc,

  8, 5 /* 40 bit */, 8,

  EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,

  rc2_init_key,

  rc2_cbc_cipher,

  NULL,

  sizeof(EVP_RC2_KEY),

  rc2_set_asn1_type_and_iv,

  rc2_get_asn1_type_and_iv,

  rc2_ctrl,

  NULL

};

const EVP_CIPHER *

EVP_rc2_64_cbc(void)

{

  return (&r2_64_cbc_cipher);

}

const EVP_CIPHER *

EVP_rc2_40_cbc(void)

{

  return (&r2_40_cbc_cipher);

}

static int

rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

    const unsigned char *iv, int enc)

{

  RC2_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx),

      key, data(ctx)->key_bits);

  return 1;

}

static int

rc2_meth_to_magic(EVP_CIPHER_CTX *e)

{

  int i;

  if (EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i) <= 0)

    return (0);

  if (i == 128)

    return (RC2_128_MAGIC);

  else if (i == 64)

    return (RC2_64_MAGIC);

  else if (i == 40)

    return (RC2_40_MAGIC);

  else

    return (0);

}

static int

rc2_magic_to_meth(int i)

{

  if (i == RC2_128_MAGIC)

    return 128;

  else if (i == RC2_64_MAGIC)

    return 64;

  else if (i == RC2_40_MAGIC)

    return 40;

  else {

    EVPerror(EVP_R_UNSUPPORTED_KEY_SIZE);

    return (0);

  }

}

static int

rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)

{

  long num = 0;

  int i = 0;

  int key_bits;

  unsigned int l;

  unsigned char iv[EVP_MAX_IV_LENGTH];

  if (type != NULL) {

    l = EVP_CIPHER_CTX_iv_length(c);

    if (l > sizeof(iv)) {

      EVPerror(EVP_R_IV_TOO_LARGE);

      return -1;

    }

    i = ASN1_TYPE_get_int_octetstring(type, &num, iv, l);

    if (i != (int)l)

      return (-1);

    key_bits = rc2_magic_to_meth((int)num);

    if (!key_bits)

      return (-1);

    if (i > 0 && !EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1))

      return -1;

    if (EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS,

        key_bits, NULL) <= 0)

      return -1;

    if (!EVP_CIPHER_CTX_set_key_length(c, key_bits / 8))

      return -1;

  }

  return (i);

}

static int

rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)

{

  long num;

  int i = 0, j;

  if (type != NULL) {

    num = rc2_meth_to_magic(c);

    j = EVP_CIPHER_CTX_iv_length(c);

    i = ASN1_TYPE_set_int_octetstring(type, num, c->oiv, j);

  }

  return (i);

}

static int

rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)

{

  switch (type) {

  case EVP_CTRL_INIT:

    data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8;

    return 1;

  case EVP_CTRL_GET_RC2_KEY_BITS:

    *(int *)ptr = data(c)->key_bits;

    return 1;

  case EVP_CTRL_SET_RC2_KEY_BITS:

    if (arg > 0) {

      data(c)->key_bits = arg;

      return 1;

    }

    return 0;

#ifdef PBE_PRF_TEST

  case EVP_CTRL_PBE_PRF_NID:

    *(int *)ptr = NID_hmacWithMD5;

    return 1;

#endif

  default:

    return -1;

  }

}

#endif