1/*
2 * Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (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
13#ifndef OPENSSL_NO_RC5
14
15# include <openssl/evp.h>
16# include "crypto/evp.h"
17# include <openssl/objects.h>
18# include "evp_local.h"
19# include <openssl/rc5.h>
20
21static int r_32_12_16_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
22                               const unsigned char *iv, int enc);
23static int rc5_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
24
25typedef struct {
26    int rounds;                 /* number of rounds */
27    RC5_32_KEY ks;              /* key schedule */
28} EVP_RC5_KEY;
29
30# define data(ctx)       EVP_C_DATA(EVP_RC5_KEY,ctx)
31
32IMPLEMENT_BLOCK_CIPHER(rc5_32_12_16, ks, RC5_32, EVP_RC5_KEY, NID_rc5,
33                       8, RC5_32_KEY_LENGTH, 8, 64,
34                       EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
35                       r_32_12_16_init_key, NULL, NULL, NULL, rc5_ctrl)
36
37static int rc5_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
38{
39    switch (type) {
40    case EVP_CTRL_INIT:
41        data(c)->rounds = RC5_12_ROUNDS;
42        return 1;
43
44    case EVP_CTRL_GET_RC5_ROUNDS:
45        *(int *)ptr = data(c)->rounds;
46        return 1;
47
48    case EVP_CTRL_SET_RC5_ROUNDS:
49        switch (arg) {
50        case RC5_8_ROUNDS:
51        case RC5_12_ROUNDS:
52        case RC5_16_ROUNDS:
53            data(c)->rounds = arg;
54            return 1;
55
56        default:
57            EVPerr(EVP_F_RC5_CTRL, EVP_R_UNSUPPORTED_NUMBER_OF_ROUNDS);
58            return 0;
59        }
60
61    default:
62        return -1;
63    }
64}
65
66static int r_32_12_16_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
67                               const unsigned char *iv, int enc)
68{
69    if (EVP_CIPHER_CTX_key_length(ctx) > 255) {
70        EVPerr(EVP_F_R_32_12_16_INIT_KEY, EVP_R_BAD_KEY_LENGTH);
71        return 0;
72    }
73    RC5_32_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx),
74                   key, data(ctx)->rounds);
75    return 1;
76}
77
78#endif
79