crypto/evp/e_null.c

   1 /*
   2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include "internal/cryptlib.h"
  12 #include <openssl/evp.h>
  13 #include <openssl/objects.h>
  14 #include "crypto/evp.h"
  15
  16 static int null_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  17                          const unsigned char *iv, int enc);
  18 static int null_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  19                        const unsigned char *in, size_t inl);
  20 static const EVP_CIPHER n_cipher = {
  21     NID_undef,
  22     1, 0, 0, 0,
  23     EVP_ORIG_GLOBAL,
  24     null_init_key,
  25     null_cipher,
  26     NULL,
  27     0,
  28     NULL,
  29     NULL,
  30     NULL,
  31     NULL
  32 };
  33
  34 const EVP_CIPHER *EVP_enc_null(void)
  35 {
  36     return &n_cipher;
  37 }
  38
  39 static int null_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  40                          const unsigned char *iv, int enc)
  41 {
  42     return 1;
  43 }
  44
  45 static int null_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  46                        const unsigned char *in, size_t inl)
  47 {
  48     if (in != out)
  49         memcpy(out, in, inl);
  50     return 1;
  51 }