crypto/evp/e_rc5.c

   1 /*
   2  * Copyright 1995-2020 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 /*
  11  * RC5 low level APIs are deprecated for public use, but still ok for internal
  12  * use.
  13  */
  14 #include "internal/deprecated.h"
  15
  16 #include <stdio.h>
  17 #include "internal/cryptlib.h"
  18
  19 #ifndef OPENSSL_NO_RC5
  20
  21 # include <openssl/evp.h>
  22 # include "crypto/evp.h"
  23 # include <openssl/objects.h>
  24 # include "evp_local.h"
  25 # include <openssl/rc5.h>
  26
  27 static int r_32_12_16_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  28                                const unsigned char *iv, int enc);
  29 static int rc5_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
  30
  31 typedef struct {
  32     int rounds;                 /* number of rounds */
  33     RC5_32_KEY ks;              /* key schedule */
  34 } EVP_RC5_KEY;
  35
  36 # define data(ctx)       EVP_C_DATA(EVP_RC5_KEY,ctx)
  37
  38 IMPLEMENT_BLOCK_CIPHER(rc5_32_12_16, ks, RC5_32, EVP_RC5_KEY, NID_rc5,
  39                        8, RC5_32_KEY_LENGTH, 8, 64,
  40                        EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
  41                        r_32_12_16_init_key, NULL, NULL, NULL, rc5_ctrl)
  42
  43 static int rc5_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
  44 {
  45     switch (type) {
  46     case EVP_CTRL_INIT:
  47         data(c)->rounds = RC5_12_ROUNDS;
  48         return 1;
  49
  50     case EVP_CTRL_GET_RC5_ROUNDS:
  51         *(int *)ptr = data(c)->rounds;
  52         return 1;
  53
  54     case EVP_CTRL_SET_RC5_ROUNDS:
  55         switch (arg) {
  56         case RC5_8_ROUNDS:
  57         case RC5_12_ROUNDS:
  58         case RC5_16_ROUNDS:
  59             data(c)->rounds = arg;
  60             return 1;
  61
  62         default:
  63             ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_NUMBER_OF_ROUNDS);
  64             return 0;
  65         }
  66
  67     default:
  68         return -1;
  69     }
  70 }
  71
  72 static int r_32_12_16_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  73                                const unsigned char *iv, int enc)
  74 {
  75     if (EVP_CIPHER_CTX_key_length(ctx) > 255) {
  76         ERR_raise(ERR_LIB_EVP, EVP_R_BAD_KEY_LENGTH);
  77         return 0;
  78     }
  79     return RC5_32_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx),
  80                           key, data(ctx)->rounds);
  81 }
  82
  83 #endif