/* $OpenBSD: p_lib.c,v 1.29 2022/06/27 12:36:05 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 <openssl/opensslconf.h>

#include <openssl/bn.h>

#include <openssl/cmac.h>

#include <openssl/err.h>

#include <openssl/evp.h>

#include <openssl/objects.h>

#include <openssl/x509.h>

#ifndef OPENSSL_NO_DH

#include <openssl/dh.h>

#endif

#ifndef OPENSSL_NO_DSA

#include <openssl/dsa.h>

#endif

#ifndef OPENSSL_NO_RSA

#include <openssl/rsa.h>

#endif

#ifndef OPENSSL_NO_ENGINE

#include <openssl/engine.h>

#endif

#include "asn1_locl.h"

#include "evp_locl.h"

static void EVP_PKEY_free_it(EVP_PKEY *x);

int

EVP_PKEY_bits(const EVP_PKEY *pkey)

{

  if (pkey && pkey->ameth && pkey->ameth->pkey_bits)

    return pkey->ameth->pkey_bits(pkey);

  return 0;

}

int

EVP_PKEY_security_bits(const EVP_PKEY *pkey)

{

  if (pkey == NULL)

    return 0;

  if (pkey->ameth == NULL || pkey->ameth->pkey_security_bits == NULL)

    return -2;

  return pkey->ameth->pkey_security_bits(pkey);

}

int

EVP_PKEY_size(const EVP_PKEY *pkey)

{

  if (pkey && pkey->ameth && pkey->ameth->pkey_size)

    return pkey->ameth->pkey_size(pkey);

  return 0;

}

int

EVP_PKEY_save_parameters(EVP_PKEY *pkey, int mode)

{

#ifndef OPENSSL_NO_DSA

  if (pkey->type == EVP_PKEY_DSA) {

    int ret = pkey->save_parameters;

    if (mode >= 0)

      pkey->save_parameters = mode;

    return (ret);

  }

#endif

#ifndef OPENSSL_NO_EC

  if (pkey->type == EVP_PKEY_EC) {

    int ret = pkey->save_parameters;

    if (mode >= 0)

      pkey->save_parameters = mode;

    return (ret);

  }

#endif

  return (0);

}

int

EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)

{

  if (to->type != from->type) {

    EVPerror(EVP_R_DIFFERENT_KEY_TYPES);

    goto err;

  }

  if (EVP_PKEY_missing_parameters(from)) {

    EVPerror(EVP_R_MISSING_PARAMETERS);

    goto err;

  }

  if (from->ameth && from->ameth->param_copy)

    return from->ameth->param_copy(to, from);

err:

  return 0;

}

int

EVP_PKEY_missing_parameters(const EVP_PKEY *pkey)

{

  if (pkey->ameth && pkey->ameth->param_missing)

    return pkey->ameth->param_missing(pkey);

  return 0;

}

int

EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)

{

  if (a->type != b->type)

    return -1;

  if (a->ameth && a->ameth->param_cmp)

    return a->ameth->param_cmp(a, b);

  return -2;

}

int

EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b)

{

  if (a->type != b->type)

    return -1;

  if (a->ameth) {

    int ret;

    /* Compare parameters if the algorithm has them */

    if (a->ameth->param_cmp) {

      ret = a->ameth->param_cmp(a, b);

      if (ret <= 0)

        return ret;

    }

    if (a->ameth->pub_cmp)

      return a->ameth->pub_cmp(a, b);

  }

  return -2;

}

EVP_PKEY *

EVP_PKEY_new(void)

{

  EVP_PKEY *ret;

  ret = malloc(sizeof(EVP_PKEY));

  if (ret == NULL) {

    EVPerror(ERR_R_MALLOC_FAILURE);

    return (NULL);

  }

  ret->type = EVP_PKEY_NONE;

  ret->save_type = EVP_PKEY_NONE;

  ret->references = 1;

  ret->ameth = NULL;

  ret->engine = NULL;

  ret->pkey.ptr = NULL;

  ret->attributes = NULL;

  ret->save_parameters = 1;

  return (ret);

}

int

EVP_PKEY_up_ref(EVP_PKEY *pkey)

{

  int refs = CRYPTO_add(&pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);

  return ((refs > 1) ? 1 : 0);

}

/* Setup a public key ASN1 method and ENGINE from a NID or a string.

 * If pkey is NULL just return 1 or 0 if the algorithm exists.

 */

static int

pkey_set_type(EVP_PKEY *pkey, ENGINE *e, int type, const char *str, int len)

{

  const EVP_PKEY_ASN1_METHOD *ameth;

  ENGINE **eptr = NULL;

  if (e == NULL)

    eptr = &e;

  if (pkey) {

    if (pkey->pkey.ptr)

      EVP_PKEY_free_it(pkey);

    /* If key type matches and a method exists then this

     * lookup has succeeded once so just indicate success.

     */

    if ((type == pkey->save_type) && pkey->ameth)

      return 1;

#ifndef OPENSSL_NO_ENGINE

    ENGINE_finish(pkey->engine);

    pkey->engine = NULL;

#endif

  }

  if (str)

    ameth = EVP_PKEY_asn1_find_str(eptr, str, len);

  else

    ameth = EVP_PKEY_asn1_find(eptr, type);

#ifndef OPENSSL_NO_ENGINE

  if (pkey == NULL && eptr != NULL)

    ENGINE_finish(e);

#endif

  if (!ameth) {

    EVPerror(EVP_R_UNSUPPORTED_ALGORITHM);

    return 0;

  }

  if (pkey) {

    pkey->ameth = ameth;

    pkey->engine = e;

    pkey->type = pkey->ameth->pkey_id;

    pkey->save_type = type;

  }

  return 1;

}

int

EVP_PKEY_set_type(EVP_PKEY *pkey, int type)

{

  return pkey_set_type(pkey, NULL, type, NULL, -1);

}

EVP_PKEY *

EVP_PKEY_new_CMAC_key(ENGINE *e, const unsigned char *priv, size_t len,

    const EVP_CIPHER *cipher)

{

  EVP_PKEY *ret = NULL;

  CMAC_CTX *cmctx = NULL;

  if ((ret = EVP_PKEY_new()) == NULL)

    goto err;

  if ((cmctx = CMAC_CTX_new()) == NULL)

    goto err;

  if (!pkey_set_type(ret, e, EVP_PKEY_CMAC, NULL, -1))

    goto err;

  if (!CMAC_Init(cmctx, priv, len, cipher, e)) {

    EVPerror(EVP_R_KEY_SETUP_FAILED);

    goto err;

  }

  ret->pkey.ptr = (char *)cmctx;

  return ret;

 err:

  EVP_PKEY_free(ret);

  CMAC_CTX_free(cmctx);

  return NULL;

}

int

EVP_PKEY_set_type_str(EVP_PKEY *pkey, const char *str, int len)

{

  return pkey_set_type(pkey, NULL, EVP_PKEY_NONE, str, len);

}

int

EVP_PKEY_assign(EVP_PKEY *pkey, int type, void *key)

{

  if (!EVP_PKEY_set_type(pkey, type))

    return 0;

  pkey->pkey.ptr = key;

  return (key != NULL);

}

void *

EVP_PKEY_get0(const EVP_PKEY *pkey)

{

  return pkey->pkey.ptr;

}

const unsigned char *

EVP_PKEY_get0_hmac(const EVP_PKEY *pkey, size_t *len)

{

  ASN1_OCTET_STRING *os;

  if (pkey->type != EVP_PKEY_HMAC) {

    EVPerror(EVP_R_EXPECTING_AN_HMAC_KEY);

    return NULL;

  }

  os = EVP_PKEY_get0(pkey);

  *len = os->length;

  return os->data;

}

#ifndef OPENSSL_NO_RSA

RSA *

EVP_PKEY_get0_RSA(EVP_PKEY *pkey)

{

  if (pkey->type != EVP_PKEY_RSA) {

    EVPerror(EVP_R_EXPECTING_AN_RSA_KEY);

    return NULL;

  }

  return pkey->pkey.rsa;

}

RSA *

EVP_PKEY_get1_RSA(EVP_PKEY *pkey)

{

  if (pkey->type != EVP_PKEY_RSA) {

    EVPerror(EVP_R_EXPECTING_AN_RSA_KEY);

    return NULL;

  }

  RSA_up_ref(pkey->pkey.rsa);

  return pkey->pkey.rsa;

}

int

EVP_PKEY_set1_RSA(EVP_PKEY *pkey, RSA *key)

{

  int ret = EVP_PKEY_assign_RSA(pkey, key);

  if (ret != 0)

    RSA_up_ref(key);

  return ret;

}

#endif

#ifndef OPENSSL_NO_DSA

DSA *

EVP_PKEY_get0_DSA(EVP_PKEY *pkey)

{

  if (pkey->type != EVP_PKEY_DSA) {

    EVPerror(EVP_R_EXPECTING_A_DSA_KEY);

    return NULL;

  }

  return pkey->pkey.dsa;

}

DSA *

EVP_PKEY_get1_DSA(EVP_PKEY *pkey)

{

  if (pkey->type != EVP_PKEY_DSA) {

    EVPerror(EVP_R_EXPECTING_A_DSA_KEY);

    return NULL;

  }

  DSA_up_ref(pkey->pkey.dsa);

  return pkey->pkey.dsa;

}

int

EVP_PKEY_set1_DSA(EVP_PKEY *pkey, DSA *key)

{

  int ret = EVP_PKEY_assign_DSA(pkey, key);

  if (ret != 0)

    DSA_up_ref(key);

  return ret;

}

#endif

#ifndef OPENSSL_NO_EC

EC_KEY *

EVP_PKEY_get0_EC_KEY(EVP_PKEY *pkey)

{

  if (pkey->type != EVP_PKEY_EC) {

    EVPerror(EVP_R_EXPECTING_A_EC_KEY);

    return NULL;

  }

  return pkey->pkey.ec;

}

EC_KEY *

EVP_PKEY_get1_EC_KEY(EVP_PKEY *pkey)

{

  if (pkey->type != EVP_PKEY_EC) {

    EVPerror(EVP_R_EXPECTING_A_EC_KEY);

    return NULL;

  }

  EC_KEY_up_ref(pkey->pkey.ec);

  return pkey->pkey.ec;

}

int

EVP_PKEY_set1_EC_KEY(EVP_PKEY *pkey, EC_KEY *key)

{

  int ret = EVP_PKEY_assign_EC_KEY(pkey, key);

  if (ret != 0)

    EC_KEY_up_ref(key);

  return ret;

}

#endif

#ifndef OPENSSL_NO_DH

DH *

EVP_PKEY_get0_DH(EVP_PKEY *pkey)

{

  if (pkey->type != EVP_PKEY_DH) {

    EVPerror(EVP_R_EXPECTING_A_DH_KEY);

    return NULL;

  }

  return pkey->pkey.dh;

}

DH *

EVP_PKEY_get1_DH(EVP_PKEY *pkey)

{

  if (pkey->type != EVP_PKEY_DH) {

    EVPerror(EVP_R_EXPECTING_A_DH_KEY);

    return NULL;

  }

  DH_up_ref(pkey->pkey.dh);

  return pkey->pkey.dh;

}

int

EVP_PKEY_set1_DH(EVP_PKEY *pkey, DH *key)

{

  int ret = EVP_PKEY_assign_DH(pkey, key);

  if (ret != 0)

    DH_up_ref(key);

  return ret;

}

#endif

int

EVP_PKEY_type(int type)

{

  int ret;

  const EVP_PKEY_ASN1_METHOD *ameth;

  ENGINE *e;

  ameth = EVP_PKEY_asn1_find(&e, type);

  if (ameth)

    ret = ameth->pkey_id;

  else

    ret = NID_undef;

#ifndef OPENSSL_NO_ENGINE

  ENGINE_finish(e);

#endif

  return ret;

}

int

EVP_PKEY_id(const EVP_PKEY *pkey)

{

  return pkey->type;

}

int

EVP_PKEY_base_id(const EVP_PKEY *pkey)

{

  return EVP_PKEY_type(pkey->type);

}

void

EVP_PKEY_free(EVP_PKEY *x)

{

  int i;

  if (x == NULL)

    return;

  i = CRYPTO_add(&x->references, -1, CRYPTO_LOCK_EVP_PKEY);

  if (i > 0)

    return;

  EVP_PKEY_free_it(x);

  if (x->attributes)

    sk_X509_ATTRIBUTE_pop_free(x->attributes, X509_ATTRIBUTE_free);

  free(x);

}

static void

EVP_PKEY_free_it(EVP_PKEY *x)

{

  if (x->ameth && x->ameth->pkey_free) {

    x->ameth->pkey_free(x);

    x->pkey.ptr = NULL;

  }

#ifndef OPENSSL_NO_ENGINE

  ENGINE_finish(x->engine);

  x->engine = NULL;

#endif

}

static int

unsup_alg(BIO *out, const EVP_PKEY *pkey, int indent, const char *kstr)

{

  if (!BIO_indent(out, indent, 128))

    return 0;

  BIO_printf(out, "%s algorithm \"%s\" unsupported\n",

      kstr, OBJ_nid2ln(pkey->type));

  return 1;

}

int

EVP_PKEY_print_public(BIO *out, const EVP_PKEY *pkey, int indent,

    ASN1_PCTX *pctx)

{

  if (pkey->ameth && pkey->ameth->pub_print)

    return pkey->ameth->pub_print(out, pkey, indent, pctx);

  return unsup_alg(out, pkey, indent, "Public Key");

}

int

EVP_PKEY_print_private(BIO *out, const EVP_PKEY *pkey, int indent,

    ASN1_PCTX *pctx)

{

  if (pkey->ameth && pkey->ameth->priv_print)

    return pkey->ameth->priv_print(out, pkey, indent, pctx);

  return unsup_alg(out, pkey, indent, "Private Key");

}

int

EVP_PKEY_print_params(BIO *out, const EVP_PKEY *pkey, int indent,

    ASN1_PCTX *pctx)

{

  if (pkey->ameth && pkey->ameth->param_print)

    return pkey->ameth->param_print(out, pkey, indent, pctx);

  return unsup_alg(out, pkey, indent, "Parameters");

}

int

EVP_PKEY_get_default_digest_nid(EVP_PKEY *pkey, int *pnid)

{

  if (!pkey->ameth || !pkey->ameth->pkey_ctrl)

    return -2;

  return pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_DEFAULT_MD_NID,

      0, pnid);

}