xref: /openssl/crypto/evp/e_rc5.c (revision fe412538)
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 
rc5_ctrl(EVP_CIPHER_CTX * c,int type,int arg,void * ptr)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 
r_32_12_16_init_key(EVP_CIPHER_CTX * ctx,const unsigned char * key,const unsigned char * iv,int enc)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