/* $OpenBSD: e_gost2814789.c,v 1.5 2021/12/12 21:30:13 tb Exp $ */

/*

 * Copyright (c) 2014 Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>

 * Copyright (c) 2005-2006 Cryptocom LTD

 *

 * 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

 *    openssl-core@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.

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

 */

#include <string.h>

#include <openssl/opensslconf.h>

#ifndef OPENSSL_NO_GOST

#include <openssl/evp.h>

#include <openssl/err.h>

#include <openssl/gost.h>

#include "evp_locl.h"

typedef struct {

  GOST2814789_KEY ks;

  int param_nid;

} EVP_GOST2814789_CTX;

static int

gost2814789_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)

{

  EVP_GOST2814789_CTX *c = ctx->cipher_data;

  switch (type) {

  case EVP_CTRL_PBE_PRF_NID:

    if (ptr != NULL) {

      *((int *)ptr) = NID_id_HMACGostR3411_94;

      return 1;

    } else {

      return 0;

    }

  case EVP_CTRL_INIT:

    /* Default value to have any s-box set at all */

    c->param_nid = NID_id_Gost28147_89_CryptoPro_A_ParamSet;

    return Gost2814789_set_sbox(&c->ks, c->param_nid);

  case EVP_CTRL_GOST_SET_SBOX:

    return Gost2814789_set_sbox(&c->ks, arg);

  default:

    return -1;

  }

}

static int

gost2814789_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

    const unsigned char *iv, int enc)

{

  EVP_GOST2814789_CTX *c = ctx->cipher_data;

  return Gost2814789_set_key(&c->ks, key, ctx->key_len * 8);

}

int

gost2814789_set_asn1_params(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params)

{

  int len = 0;

  unsigned char *buf = NULL;

  unsigned char *p = NULL;

  EVP_GOST2814789_CTX *c = ctx->cipher_data;

  ASN1_OCTET_STRING *os = NULL;

  GOST_CIPHER_PARAMS *gcp = GOST_CIPHER_PARAMS_new();

  if (gcp == NULL) {

    GOSTerror(ERR_R_MALLOC_FAILURE);

    return 0;

  }

  if (ASN1_OCTET_STRING_set(gcp->iv, ctx->iv, ctx->cipher->iv_len) == 0) {

    GOST_CIPHER_PARAMS_free(gcp);

    GOSTerror(ERR_R_ASN1_LIB);

    return 0;

  }

  ASN1_OBJECT_free(gcp->enc_param_set);

  gcp->enc_param_set = OBJ_nid2obj(c->param_nid);

  len = i2d_GOST_CIPHER_PARAMS(gcp, NULL);

  p = buf = malloc(len);

  if (buf == NULL) {

    GOST_CIPHER_PARAMS_free(gcp);

    GOSTerror(ERR_R_MALLOC_FAILURE);

    return 0;

  }

  i2d_GOST_CIPHER_PARAMS(gcp, &p);

  GOST_CIPHER_PARAMS_free(gcp);

  os = ASN1_OCTET_STRING_new();

  if (os == NULL) {

    free(buf);

    GOSTerror(ERR_R_MALLOC_FAILURE);

    return 0;

  }

  if (ASN1_OCTET_STRING_set(os, buf, len) == 0) {

    ASN1_OCTET_STRING_free(os);

    free(buf);

    GOSTerror(ERR_R_ASN1_LIB);

    return 0;

  }

  free(buf);

  ASN1_TYPE_set(params, V_ASN1_SEQUENCE, os);

  return 1;

}

int

gost2814789_get_asn1_params(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params)

{

  int ret = -1;

  int len;

  GOST_CIPHER_PARAMS *gcp = NULL;

  EVP_GOST2814789_CTX *c = ctx->cipher_data;

  unsigned char *p;

  if (ASN1_TYPE_get(params) != V_ASN1_SEQUENCE)

    return ret;

  p = params->value.sequence->data;

  gcp = d2i_GOST_CIPHER_PARAMS(NULL, (const unsigned char **)&p,

      params->value.sequence->length);

  len = gcp->iv->length;

  if (len != ctx->cipher->iv_len) {

    GOST_CIPHER_PARAMS_free(gcp);

    GOSTerror(GOST_R_INVALID_IV_LENGTH);

    return -1;

  }

  if (!Gost2814789_set_sbox(&c->ks, OBJ_obj2nid(gcp->enc_param_set))) {

    GOST_CIPHER_PARAMS_free(gcp);

    return -1;

  }

  c->param_nid = OBJ_obj2nid(gcp->enc_param_set);

  memcpy(ctx->oiv, gcp->iv->data, len);

  memcpy(ctx->iv, gcp->iv->data, len);

  GOST_CIPHER_PARAMS_free(gcp);

  return 1;

}

BLOCK_CIPHER_func_ecb(gost2814789, Gost2814789, EVP_GOST2814789_CTX, ks)

BLOCK_CIPHER_func_cfb(gost2814789, Gost2814789, 64, EVP_GOST2814789_CTX, ks)

static int

gost2814789_cnt_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

    const unsigned char *in, size_t inl)

{

  EVP_GOST2814789_CTX *c = ctx->cipher_data;

  while (inl >= EVP_MAXCHUNK) {

    Gost2814789_cnt_encrypt(in, out, (long)EVP_MAXCHUNK, &c->ks,

        ctx->iv, ctx->buf, &ctx->num);

    inl -= EVP_MAXCHUNK;

    in += EVP_MAXCHUNK;

    out += EVP_MAXCHUNK;

  }

  if (inl)

    Gost2814789_cnt_encrypt(in, out, inl, &c->ks, ctx->iv, ctx->buf,

        &ctx->num);

  return 1;

}

/* gost89 is CFB-64 */

#define NID_gost89_cfb64 NID_id_Gost28147_89

BLOCK_CIPHER_def_ecb(gost2814789, EVP_GOST2814789_CTX, NID_gost89, 8, 32,

         EVP_CIPH_NO_PADDING | EVP_CIPH_CTRL_INIT,

         gost2814789_init_key, NULL, gost2814789_set_asn1_params,

         gost2814789_get_asn1_params, gost2814789_ctl)

BLOCK_CIPHER_def_cfb(gost2814789, EVP_GOST2814789_CTX, NID_gost89, 32, 8, 64,

         EVP_CIPH_NO_PADDING | EVP_CIPH_CTRL_INIT,

         gost2814789_init_key, NULL, gost2814789_set_asn1_params,

         gost2814789_get_asn1_params, gost2814789_ctl)

BLOCK_CIPHER_def1(gost2814789, cnt, cnt, OFB, EVP_GOST2814789_CTX, NID_gost89,

      1, 32, 8, EVP_CIPH_NO_PADDING | EVP_CIPH_CTRL_INIT,

      gost2814789_init_key, NULL, gost2814789_set_asn1_params,

      gost2814789_get_asn1_params, gost2814789_ctl)

#endif