/* $OpenBSD: evp_lib.c,v 1.24 2022/01/10 13:42:28 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 "asn1_locl.h"

#include "evp_locl.h"

int

EVP_CIPHER_param_to_asn1(EVP_CIPHER_CTX *c, ASN1_TYPE *type)

{

  int ret;

  if (c->cipher->set_asn1_parameters != NULL)

    ret = c->cipher->set_asn1_parameters(c, type);

  else if (c->cipher->flags & EVP_CIPH_FLAG_DEFAULT_ASN1)

    ret = EVP_CIPHER_set_asn1_iv(c, type);

  else

    ret = -1;

  return (ret);

}

int

EVP_CIPHER_asn1_to_param(EVP_CIPHER_CTX *c, ASN1_TYPE *type)

{

  int ret;

  if (c->cipher->get_asn1_parameters != NULL)

    ret = c->cipher->get_asn1_parameters(c, type);

  else if (c->cipher->flags & EVP_CIPH_FLAG_DEFAULT_ASN1)

    ret = EVP_CIPHER_get_asn1_iv(c, type);

  else

    ret = -1;

  return (ret);

}

int

EVP_CIPHER_get_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)

{

  int i = 0;

  unsigned int l;

  if (type != NULL) {

    l = EVP_CIPHER_CTX_iv_length(c);

    if (l > sizeof(c->iv)) {

      EVPerror(EVP_R_IV_TOO_LARGE);

      return 0;

    }

    i = ASN1_TYPE_get_octetstring(type, c->oiv, l);

    if (i != (int)l)

      return (-1);

    else if (i > 0)

      memcpy(c->iv, c->oiv, l);

  }

  return (i);

}

int

EVP_CIPHER_set_asn1_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)

{

  int i = 0;

  unsigned int j;

  if (type != NULL) {

    j = EVP_CIPHER_CTX_iv_length(c);

    if (j > sizeof(c->iv)) {

      EVPerror(EVP_R_IV_TOO_LARGE);

      return 0;

    }

    i = ASN1_TYPE_set_octetstring(type, c->oiv, j);

  }

  return (i);

}

/* Convert the various cipher NIDs and dummies to a proper OID NID */

int

EVP_CIPHER_type(const EVP_CIPHER *ctx)

{

  int nid;

  ASN1_OBJECT *otmp;

  nid = EVP_CIPHER_nid(ctx);

  switch (nid) {

  case NID_rc2_cbc:

  case NID_rc2_64_cbc:

  case NID_rc2_40_cbc:

    return NID_rc2_cbc;

  case NID_rc4:

  case NID_rc4_40:

    return NID_rc4;

  case NID_aes_128_cfb128:

  case NID_aes_128_cfb8:

  case NID_aes_128_cfb1:

    return NID_aes_128_cfb128;

  case NID_aes_192_cfb128:

  case NID_aes_192_cfb8:

  case NID_aes_192_cfb1:

    return NID_aes_192_cfb128;

  case NID_aes_256_cfb128:

  case NID_aes_256_cfb8:

  case NID_aes_256_cfb1:

    return NID_aes_256_cfb128;

  case NID_des_cfb64:

  case NID_des_cfb8:

  case NID_des_cfb1:

    return NID_des_cfb64;

  case NID_des_ede3_cfb64:

  case NID_des_ede3_cfb8:

  case NID_des_ede3_cfb1:

    return NID_des_cfb64;

  default:

    /* Check it has an OID and it is valid */

    otmp = OBJ_nid2obj(nid);

    if (!otmp || !otmp->data)

      nid = NID_undef;

    ASN1_OBJECT_free(otmp);

    return nid;

  }

}

int

EVP_CIPHER_block_size(const EVP_CIPHER *e)

{

  return e->block_size;

}

int

EVP_CIPHER_CTX_block_size(const EVP_CIPHER_CTX *ctx)

{

  return ctx->cipher->block_size;

}

int

EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in,

    unsigned int inl)

{

  return ctx->cipher->do_cipher(ctx, out, in, inl);

}

const EVP_CIPHER *

EVP_CIPHER_CTX_cipher(const EVP_CIPHER_CTX *ctx)

{

  return ctx->cipher;

}

int

EVP_CIPHER_CTX_encrypting(const EVP_CIPHER_CTX *ctx)

{

  return ctx->encrypt;

}

unsigned long

EVP_CIPHER_flags(const EVP_CIPHER *cipher)

{

  return cipher->flags;

}

unsigned long

EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx)

{

  return ctx->cipher->flags;

}

void *

EVP_CIPHER_CTX_get_app_data(const EVP_CIPHER_CTX *ctx)

{

  return ctx->app_data;

}

void

EVP_CIPHER_CTX_set_app_data(EVP_CIPHER_CTX *ctx, void *data)

{

  ctx->app_data = data;

}

void *

EVP_CIPHER_CTX_get_cipher_data(const EVP_CIPHER_CTX *ctx)

{

  return ctx->cipher_data;

}

void *

EVP_CIPHER_CTX_set_cipher_data(EVP_CIPHER_CTX *ctx, void *cipher_data)

{

  void *old_cipher_data;

  old_cipher_data = ctx->cipher_data;

  ctx->cipher_data = cipher_data;

  return old_cipher_data;

}

int

EVP_CIPHER_iv_length(const EVP_CIPHER *cipher)

{

  return cipher->iv_len;

}

int

EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx)

{

  return ctx->cipher->iv_len;

}

unsigned char *

EVP_CIPHER_CTX_buf_noconst(EVP_CIPHER_CTX *ctx)

{

  return ctx->buf;

}

int

EVP_CIPHER_key_length(const EVP_CIPHER *cipher)

{

  return cipher->key_len;

}

int

EVP_CIPHER_CTX_key_length(const EVP_CIPHER_CTX *ctx)

{

  return ctx->key_len;

}

int

EVP_CIPHER_nid(const EVP_CIPHER *cipher)

{

  return cipher->nid;

}

int

EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx)

{

  return ctx->cipher->nid;

}

int

EVP_CIPHER_CTX_get_iv(const EVP_CIPHER_CTX *ctx, unsigned char *iv, size_t len)

{

  if (ctx == NULL || len != EVP_CIPHER_CTX_iv_length(ctx))

    return 0;

  if (len > EVP_MAX_IV_LENGTH)

    return 0; /* sanity check; shouldn't happen */

  /*

   * Skip the memcpy entirely when the requested IV length is zero,

   * since the iv pointer may be NULL or invalid.

   */

  if (len != 0) {

    if (iv == NULL)

      return 0;

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

  }

  return 1;

}

int

EVP_CIPHER_CTX_set_iv(EVP_CIPHER_CTX *ctx, const unsigned char *iv, size_t len)

{

  if (ctx == NULL || len != EVP_CIPHER_CTX_iv_length(ctx))

    return 0;

  if (len > EVP_MAX_IV_LENGTH)

    return 0; /* sanity check; shouldn't happen */

  /*

   * Skip the memcpy entirely when the requested IV length is zero,

   * since the iv pointer may be NULL or invalid.

   */

  if (len != 0) {

    if (iv == NULL)

      return 0;

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

  }

  return 1;

}

int

EVP_MD_block_size(const EVP_MD *md)

{

  return md->block_size;

}

int

EVP_MD_type(const EVP_MD *md)

{

  return md->type;

}

int

EVP_MD_pkey_type(const EVP_MD *md)

{

  return md->pkey_type;

}

int

EVP_MD_size(const EVP_MD *md)

{

  if (!md) {

    EVPerror(EVP_R_MESSAGE_DIGEST_IS_NULL);

    return -1;

  }

  return md->md_size;

}

unsigned long

EVP_MD_flags(const EVP_MD *md)

{

  return md->flags;

}

EVP_MD *

EVP_MD_meth_new(int md_type, int pkey_type)

{

  EVP_MD *md;

  if ((md = calloc(1, sizeof(*md))) == NULL)

    return NULL;

  md->type = md_type;

  md->pkey_type = pkey_type;

  return md;

}

EVP_MD *

EVP_MD_meth_dup(const EVP_MD *md)

{

  EVP_MD *to;

  if ((to = EVP_MD_meth_new(md->type, md->pkey_type)) == NULL)

    return NULL;

  memcpy(to, md, sizeof(*to));

  return to;

}

void

EVP_MD_meth_free(EVP_MD *md)

{

  freezero(md, sizeof(*md));

}

int

EVP_MD_meth_set_input_blocksize(EVP_MD *md, int blocksize)

{

  md->block_size = blocksize;

  return 1;

}

int

EVP_MD_meth_set_result_size(EVP_MD *md, int result_size)

{

  md->md_size = result_size;

  return 1;

}

int

EVP_MD_meth_set_app_datasize(EVP_MD *md, int datasize)

{

  md->ctx_size = datasize;

  return 1;

}

int

EVP_MD_meth_set_flags(EVP_MD *md, unsigned long flags)

{

  md->flags = flags;

  return 1;

}

int

EVP_MD_meth_set_init(EVP_MD *md, int (*init)(EVP_MD_CTX *ctx))

{

  md->init = init;

  return 1;

}

int

EVP_MD_meth_set_update(EVP_MD *md,

    int (*update)(EVP_MD_CTX *ctx, const void *data, size_t count))

{

  md->update = update;

  return 1;

}

int

EVP_MD_meth_set_final(EVP_MD *md,

    int (*final)(EVP_MD_CTX *ctx, unsigned char *md))

{

  md->final = final;

  return 1;

}

int

EVP_MD_meth_set_copy(EVP_MD *md,

    int (*copy)(EVP_MD_CTX *to, const EVP_MD_CTX *from))

{

  md->copy = copy;

  return 1;

}

int

EVP_MD_meth_set_cleanup(EVP_MD *md,

    int (*cleanup)(EVP_MD_CTX *ctx))

{

  md->cleanup = cleanup;

  return 1;

}

int

EVP_MD_meth_set_ctrl(EVP_MD *md,

    int (*ctrl)(EVP_MD_CTX *ctx, int cmd, int p1, void *p2))

{

  md->md_ctrl = ctrl;

  return 1;

}

const EVP_MD *

EVP_MD_CTX_md(const EVP_MD_CTX *ctx)

{

  if (!ctx)

    return NULL;

  return ctx->digest;

}

void *

EVP_MD_CTX_md_data(const EVP_MD_CTX *ctx)

{

  return ctx->md_data;

}

EVP_PKEY_CTX *

EVP_MD_CTX_pkey_ctx(const EVP_MD_CTX *ctx)

{

  return ctx->pctx;

}

void

EVP_MD_CTX_set_pkey_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pctx)

{

  if (EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX)) {

    EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);

  } else {

    EVP_PKEY_CTX_free(ctx->pctx);

  }

  ctx->pctx = pctx;

  if (pctx != NULL) {

    /*

     * For unclear reasons it was decided that the caller keeps

     * ownership of pctx. So a flag was invented to make sure we

     * don't free it in EVP_MD_CTX_cleanup(). We also need to

     * unset it in EVP_MD_CTX_copy_ex(). Fortunately, the flag

     * isn't public...

     */

    EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);

  }

}

void

EVP_MD_CTX_set_flags(EVP_MD_CTX *ctx, int flags)

{

  ctx->flags |= flags;

}

void

EVP_MD_CTX_clear_flags(EVP_MD_CTX *ctx, int flags)

{

  ctx->flags &= ~flags;

}

int

EVP_MD_CTX_test_flags(const EVP_MD_CTX *ctx, int flags)

{

  return (ctx->flags & flags);

}

void

EVP_CIPHER_CTX_set_flags(EVP_CIPHER_CTX *ctx, int flags)

{

  ctx->flags |= flags;

}

void

EVP_CIPHER_CTX_clear_flags(EVP_CIPHER_CTX *ctx, int flags)

{

  ctx->flags &= ~flags;

}

int

EVP_CIPHER_CTX_test_flags(const EVP_CIPHER_CTX *ctx, int flags)

{

  return (ctx->flags & flags);

}