Coverage Report

Created: 2022-08-24 06:30

/src/libressl/crypto/rsa/rsa_crpt.c
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Source (jump to first uncovered line)
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/* $OpenBSD: rsa_crpt.c,v 1.20 2022/01/07 09:55:32 tb Exp $ */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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 * All rights reserved.
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 *
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 * This package is an SSL implementation written
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 * by Eric Young (eay@cryptsoft.com).
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 * The implementation was written so as to conform with Netscapes SSL.
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 *
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 * This library is free for commercial and non-commercial use as long as
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 * the following conditions are aheared to.  The following conditions
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 * apply to all code found in this distribution, be it the RC4, RSA,
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 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
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 * included with this distribution is covered by the same copyright terms
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 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
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 *
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 * Copyright remains Eric Young's, and as such any Copyright notices in
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 * the code are not to be removed.
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 * If this package is used in a product, Eric Young should be given attribution
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 * as the author of the parts of the library used.
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 * This can be in the form of a textual message at program startup or
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 * in documentation (online or textual) provided with the package.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. All advertising materials mentioning features or use of this software
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 *    must display the following acknowledgement:
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 *    "This product includes cryptographic software written by
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 *     Eric Young (eay@cryptsoft.com)"
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 *    The word 'cryptographic' can be left out if the rouines from the library
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 *    being used are not cryptographic related :-).
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 * 4. If you include any Windows specific code (or a derivative thereof) from
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 *    the apps directory (application code) you must include an acknowledgement:
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 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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 *
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 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 *
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 * The licence and distribution terms for any publically available version or
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 * derivative of this code cannot be changed.  i.e. this code cannot simply be
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 * copied and put under another distribution licence
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 * [including the GNU Public Licence.]
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 */
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#include <stdio.h>
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#include <openssl/opensslconf.h>
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#include <openssl/bn.h>
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#include <openssl/crypto.h>
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#include <openssl/err.h>
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#include <openssl/lhash.h>
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#include <openssl/rsa.h>
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#include "bn_lcl.h"
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#include "rsa_locl.h"
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#ifndef OPENSSL_NO_ENGINE
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#include <openssl/engine.h>
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#endif
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int
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RSA_bits(const RSA *r)
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0
{
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0
  return BN_num_bits(r->n);
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0
}
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int
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RSA_size(const RSA *r)
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0
{
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0
  return BN_num_bytes(r->n);
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0
}
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int
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RSA_public_encrypt(int flen, const unsigned char *from, unsigned char *to,
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    RSA *rsa, int padding)
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0
{
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0
  return rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding);
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0
}
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int
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RSA_private_encrypt(int flen, const unsigned char *from, unsigned char *to,
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    RSA *rsa, int padding)
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0
{
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0
  return rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding);
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0
}
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int
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RSA_private_decrypt(int flen, const unsigned char *from, unsigned char *to,
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    RSA *rsa, int padding)
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0
{
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0
  return rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding);
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0
}
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109
int
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RSA_public_decrypt(int flen, const unsigned char *from, unsigned char *to,
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    RSA *rsa, int padding)
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0
{
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0
  return rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding);
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0
}
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int
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RSA_flags(const RSA *r)
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0
{
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0
  return r == NULL ? 0 : r->meth->flags;
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0
}
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void
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RSA_blinding_off(RSA *rsa)
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0
{
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0
  BN_BLINDING_free(rsa->blinding);
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0
  rsa->blinding = NULL;
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0
  rsa->flags |= RSA_FLAG_NO_BLINDING;
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0
}
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int
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RSA_blinding_on(RSA *rsa, BN_CTX *ctx)
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0
{
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0
  int ret = 0;
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135
0
  if (rsa->blinding != NULL)
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0
    RSA_blinding_off(rsa);
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138
0
  rsa->blinding = RSA_setup_blinding(rsa, ctx);
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0
  if (rsa->blinding == NULL)
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0
    goto err;
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0
  rsa->flags &= ~RSA_FLAG_NO_BLINDING;
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0
  ret = 1;
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0
err:
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0
  return (ret);
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0
}
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static BIGNUM *
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rsa_get_public_exp(const BIGNUM *d, const BIGNUM *p, const BIGNUM *q,
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    BN_CTX *ctx)
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0
{
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0
  BIGNUM *ret = NULL, *r0, *r1, *r2;
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0
  if (d == NULL || p == NULL || q == NULL)
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0
    return NULL;
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0
  BN_CTX_start(ctx);
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0
  if ((r0 = BN_CTX_get(ctx)) == NULL)
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0
    goto err;
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0
  if ((r1 = BN_CTX_get(ctx)) == NULL)
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0
    goto err;
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0
  if ((r2 = BN_CTX_get(ctx)) == NULL)
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0
    goto err;
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0
  if (!BN_sub(r1, p, BN_value_one()))
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0
    goto err;
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0
  if (!BN_sub(r2, q, BN_value_one()))
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0
    goto err;
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0
  if (!BN_mul(r0, r1, r2, ctx))
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0
    goto err;
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0
  ret = BN_mod_inverse_ct(NULL, d, r0, ctx);
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0
err:
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0
  BN_CTX_end(ctx);
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0
  return ret;
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0
}
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BN_BLINDING *
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RSA_setup_blinding(RSA *rsa, BN_CTX *in_ctx)
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0
{
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0
  BIGNUM *e;
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0
  BIGNUM n;
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0
  BN_CTX *ctx;
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0
  BN_BLINDING *ret = NULL;
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186
0
  if (in_ctx == NULL) {
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0
    if ((ctx = BN_CTX_new()) == NULL)
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0
      return 0;
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0
  } else
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0
    ctx = in_ctx;
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192
0
  BN_CTX_start(ctx);
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194
0
  if (rsa->e == NULL) {
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0
    e = rsa_get_public_exp(rsa->d, rsa->p, rsa->q, ctx);
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0
    if (e == NULL) {
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0
      RSAerror(RSA_R_NO_PUBLIC_EXPONENT);
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0
      goto err;
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0
    }
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0
  } else
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0
    e = rsa->e;
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203
0
  BN_init(&n);
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0
  BN_with_flags(&n, rsa->n, BN_FLG_CONSTTIME);
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0
  ret = BN_BLINDING_create_param(NULL, e, &n, ctx, rsa->meth->bn_mod_exp,
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0
      rsa->_method_mod_n);
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209
0
  if (ret == NULL) {
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0
    RSAerror(ERR_R_BN_LIB);
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0
    goto err;
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0
  }
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0
  CRYPTO_THREADID_current(BN_BLINDING_thread_id(ret));
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0
err:
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0
  BN_CTX_end(ctx);
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0
  if (in_ctx == NULL)
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0
    BN_CTX_free(ctx);
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0
  if (rsa->e == NULL)
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0
    BN_free(e);
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221
0
  return ret;
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0
}