/* $OpenBSD: rsa_lib.c,v 1.43 2022/06/27 12:30:28 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 <openssl/opensslconf.h>

#include <openssl/bn.h>

#include <openssl/crypto.h>

#include <openssl/err.h>

#include <openssl/evp.h>

#include <openssl/lhash.h>

#include <openssl/rsa.h>

#include "evp_locl.h"

#include "rsa_locl.h"

#ifndef OPENSSL_NO_ENGINE

#include <openssl/engine.h>

#endif

static const RSA_METHOD *default_RSA_meth = NULL;

RSA *

RSA_new(void)

{

  RSA *r = RSA_new_method(NULL);

  return r;

}

void

RSA_set_default_method(const RSA_METHOD *meth)

{

  default_RSA_meth = meth;

}

const RSA_METHOD *

RSA_get_default_method(void)

{

  if (default_RSA_meth == NULL)

    default_RSA_meth = RSA_PKCS1_SSLeay();

  return default_RSA_meth;

}

const RSA_METHOD *

RSA_get_method(const RSA *rsa)

{

  return rsa->meth;

}

int

RSA_set_method(RSA *rsa, const RSA_METHOD *meth)

{

  /*

   * NB: The caller is specifically setting a method, so it's not up to us

   * to deal with which ENGINE it comes from.

   */

  const RSA_METHOD *mtmp;

  mtmp = rsa->meth;

  if (mtmp->finish)

    mtmp->finish(rsa);

#ifndef OPENSSL_NO_ENGINE

  ENGINE_finish(rsa->engine);

  rsa->engine = NULL;

#endif

  rsa->meth = meth;

  if (meth->init)

    meth->init(rsa);

  return 1;

}

RSA *

RSA_new_method(ENGINE *engine)

{

  RSA *ret;

  if ((ret = calloc(1, sizeof(RSA))) == NULL) {

    RSAerror(ERR_R_MALLOC_FAILURE);

    return NULL;

  }

  ret->meth = RSA_get_default_method();

#ifndef OPENSSL_NO_ENGINE

  if (engine != NULL) {

    if (!ENGINE_init(engine)) {

      RSAerror(ERR_R_ENGINE_LIB);

      goto err;

    }

    ret->engine = engine;

  } else {

    ret->engine = ENGINE_get_default_RSA();

  }

  if (ret->engine != NULL) {

    if ((ret->meth = ENGINE_get_RSA(ret->engine)) == NULL) {

      RSAerror(ERR_R_ENGINE_LIB);

      goto err;

    }

  }

#endif

  ret->references = 1;

  ret->flags = ret->meth->flags & ~RSA_FLAG_NON_FIPS_ALLOW;

  if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data))

    goto err;

  if (ret->meth->init != NULL && !ret->meth->init(ret)) {

    CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data);

    goto err;

  }

  return ret;

 err:

#ifndef OPENSSL_NO_ENGINE

  ENGINE_finish(ret->engine);

#endif

  free(ret);

  return NULL;

}

void

RSA_free(RSA *r)

{

  int i;

  if (r == NULL)

    return;

  i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_RSA);

  if (i > 0)

    return;

  if (r->meth->finish)

    r->meth->finish(r);

#ifndef OPENSSL_NO_ENGINE

  ENGINE_finish(r->engine);

#endif

  CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data);

  BN_clear_free(r->n);

  BN_clear_free(r->e);

  BN_clear_free(r->d);

  BN_clear_free(r->p);

  BN_clear_free(r->q);

  BN_clear_free(r->dmp1);

  BN_clear_free(r->dmq1);

  BN_clear_free(r->iqmp);

  BN_BLINDING_free(r->blinding);

  BN_BLINDING_free(r->mt_blinding);

  RSA_PSS_PARAMS_free(r->pss);

  free(r);

}

int

RSA_up_ref(RSA *r)

{

  int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_RSA);

  return i > 1 ? 1 : 0;

}

int

RSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,

    CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)

{

  return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_RSA, argl, argp,

      new_func, dup_func, free_func);

}

int

RSA_set_ex_data(RSA *r, int idx, void *arg)

{

  return CRYPTO_set_ex_data(&r->ex_data, idx, arg);

}

void *

RSA_get_ex_data(const RSA *r, int idx)

{

  return CRYPTO_get_ex_data(&r->ex_data, idx);

}

int

RSA_security_bits(const RSA *rsa)

{

  return BN_security_bits(RSA_bits(rsa), -1);

}

void

RSA_get0_key(const RSA *r, const BIGNUM **n, const BIGNUM **e, const BIGNUM **d)

{

  if (n != NULL)

    *n = r->n;

  if (e != NULL)

    *e = r->e;

  if (d != NULL)

    *d = r->d;

}

int

RSA_set0_key(RSA *r, BIGNUM *n, BIGNUM *e, BIGNUM *d)

{

  if ((r->n == NULL && n == NULL) || (r->e == NULL && e == NULL))

    return 0;

  if (n != NULL) {

    BN_free(r->n);

    r->n = n;

  }

  if (e != NULL) {

    BN_free(r->e);

    r->e = e;

  }

  if (d != NULL) {

    BN_free(r->d);

    r->d = d;

  }

  return 1;

}

void

RSA_get0_crt_params(const RSA *r, const BIGNUM **dmp1, const BIGNUM **dmq1,

    const BIGNUM **iqmp)

{

  if (dmp1 != NULL)

    *dmp1 = r->dmp1;

  if (dmq1 != NULL)

    *dmq1 = r->dmq1;

  if (iqmp != NULL)

    *iqmp = r->iqmp;

}

int

RSA_set0_crt_params(RSA *r, BIGNUM *dmp1, BIGNUM *dmq1, BIGNUM *iqmp)

{

  if ((r->dmp1 == NULL && dmp1 == NULL) ||

      (r->dmq1 == NULL && dmq1 == NULL) ||

      (r->iqmp == NULL && iqmp == NULL))

          return 0;

  if (dmp1 != NULL) {

    BN_free(r->dmp1);

    r->dmp1 = dmp1;

  }

  if (dmq1 != NULL) {

    BN_free(r->dmq1);

    r->dmq1 = dmq1;

  }

  if (iqmp != NULL) {

    BN_free(r->iqmp);

    r->iqmp = iqmp;

  }

  return 1;

}

void

RSA_get0_factors(const RSA *r, const BIGNUM **p, const BIGNUM **q)

{

  if (p != NULL)

    *p = r->p;

  if (q != NULL)

    *q = r->q;

}

int

RSA_set0_factors(RSA *r, BIGNUM *p, BIGNUM *q)

{

  if ((r->p == NULL && p == NULL) || (r->q == NULL && q == NULL))

    return 0;

  if (p != NULL) {

    BN_free(r->p);

    r->p = p;

  }

  if (q != NULL) {

    BN_free(r->q);

    r->q = q;

  }

  return 1;

}

const BIGNUM *

RSA_get0_n(const RSA *r)

{

  return r->n;

}

const BIGNUM *

RSA_get0_e(const RSA *r)

{

  return r->e;

}

const BIGNUM *

RSA_get0_d(const RSA *r)

{

  return r->d;

}

const BIGNUM *

RSA_get0_p(const RSA *r)

{

  return r->p;

}

const BIGNUM *

RSA_get0_q(const RSA *r)

{

  return r->q;

}

const BIGNUM *

RSA_get0_dmp1(const RSA *r)

{

  return r->dmp1;

}

const BIGNUM *

RSA_get0_dmq1(const RSA *r)

{

  return r->dmq1;

}

const BIGNUM *

RSA_get0_iqmp(const RSA *r)

{

  return r->iqmp;

}

const RSA_PSS_PARAMS *

RSA_get0_pss_params(const RSA *r)

{

  return r->pss;

}

void

RSA_clear_flags(RSA *r, int flags)

{

  r->flags &= ~flags;

}

int

RSA_test_flags(const RSA *r, int flags)

{

  return r->flags & flags;

}

void

RSA_set_flags(RSA *r, int flags)

{

  r->flags |= flags;

}

int

RSA_pkey_ctx_ctrl(EVP_PKEY_CTX *ctx, int optype, int cmd, int p1, void *p2)

{

  /* Return an error if the key type is not RSA or RSA-PSS. */

  if (ctx != NULL && ctx->pmeth != NULL &&

      ctx->pmeth->pkey_id != EVP_PKEY_RSA &&

      ctx->pmeth->pkey_id != EVP_PKEY_RSA_PSS)

    return -1;

  return EVP_PKEY_CTX_ctrl(ctx, -1, optype, cmd, p1, p2);

}