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      1 /*
      2  * Copyright 1995-2021 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     const int key_len = EVP_CIPHER_CTX_get_key_length(ctx);
     76 
     77     if (key_len > 255 || key_len < 0) {
     78         ERR_raise(ERR_LIB_EVP, EVP_R_BAD_KEY_LENGTH);
     79         return 0;
     80     }
     81     return RC5_32_set_key(&data(ctx)->ks, key_len, key, data(ctx)->rounds);
     82 }
     83 
     84 #endif
     85