text: /* 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.] */
  
  #ifndef OPENSSL_HEADER_RSA_INTERNAL_H
  #define OPENSSL_HEADER_RSA_INTERNAL_H
  
  #include <openssl/base.h>
  
  #include <openssl/bn.h>
  
  
  #if defined(__cplusplus)
  extern "C" {
  #endif
  
  
  // Default implementations of RSA operations.
  
  const RSA_METHOD *RSA_default_method(void);
  
  size_t rsa_default_size(const RSA *rsa);
  int rsa_default_sign_raw(RSA *rsa, size_t *out_len, uint8_t *out,
                           size_t max_out, const uint8_t *in, size_t in_len,
                           int padding);
  int rsa_default_decrypt(RSA *rsa, size_t *out_len, uint8_t *out, size_t max_out,
                          const uint8_t *in, size_t in_len, int padding);
  int rsa_default_private_transform(RSA *rsa, uint8_t *out, const uint8_t *in,
                                    size_t len);
  
  
  BN_BLINDING *BN_BLINDING_new(void);
  void BN_BLINDING_free(BN_BLINDING *b);
  int BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, const BIGNUM *e,
                          const BN_MONT_CTX *mont_ctx, BN_CTX *ctx);
  int BN_BLINDING_invert(BIGNUM *n, const BN_BLINDING *b, BN_MONT_CTX *mont_ctx,
                         BN_CTX *ctx);
  
  
  int RSA_padding_add_PKCS1_type_1(uint8_t *to, size_t to_len,
                                   const uint8_t *from, size_t from_len);
  int RSA_padding_check_PKCS1_type_1(uint8_t *out, size_t *out_len,
                                     size_t max_out, const uint8_t *from,
                                     size_t from_len);
  int RSA_padding_add_PKCS1_type_2(uint8_t *to, size_t to_len,
                                   const uint8_t *from, size_t from_len);
  int RSA_padding_check_PKCS1_type_2(uint8_t *out, size_t *out_len,
                                     size_t max_out, const uint8_t *from,
                                     size_t from_len);
  int RSA_padding_check_PKCS1_OAEP_mgf1(uint8_t *out, size_t *out_len,
                                        size_t max_out, const uint8_t *from,
                                        size_t from_len, const uint8_t *param,
                                        size_t param_len, const EVP_MD *md,
                                        const EVP_MD *mgf1md);
  int RSA_padding_add_none(uint8_t *to, size_t to_len, const uint8_t *from,
                           size_t from_len);
  
  // RSA_private_transform calls either the method-specific |private_transform|
  // function (if given) or the generic one. See the comment for
  // |private_transform| in |rsa_meth_st|.
  int RSA_private_transform(RSA *rsa, uint8_t *out, const uint8_t *in,
                            size_t len);
  
  
  // The following utility functions are exported for test purposes.
  
  extern const BN_ULONG kBoringSSLRSASqrtTwo[];
  extern const size_t kBoringSSLRSASqrtTwoLen;
  
  // rsa_greater_than_pow2 returns one if |b| is greater than 2^|n| and zero
  // otherwise.
  int rsa_greater_than_pow2(const BIGNUM *b, int n);
  
  
  #if defined(__cplusplus)
  }  // extern C
  #endif
  
  #endif  // OPENSSL_HEADER_RSA_INTERNAL_H
  