1/*
2 * Copyright 2019-2021 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 * DES low level APIs are deprecated for public use, but still ok for internal
12 * use.
13 */
14#include "internal/deprecated.h"
15
16#include <openssl/rand.h>
17#include <openssl/proverr.h>
18#include "prov/ciphercommon.h"
19#include "cipher_des.h"
20#include "prov/implementations.h"
21#include "prov/providercommon.h"
22
23#define DES_FLAGS PROV_CIPHER_FLAG_RAND_KEY
24
25static OSSL_FUNC_cipher_freectx_fn des_freectx;
26static OSSL_FUNC_cipher_encrypt_init_fn des_einit;
27static OSSL_FUNC_cipher_decrypt_init_fn des_dinit;
28static OSSL_FUNC_cipher_get_ctx_params_fn des_get_ctx_params;
29static OSSL_FUNC_cipher_gettable_ctx_params_fn des_gettable_ctx_params;
30
31static void *des_newctx(void *provctx, size_t kbits, size_t blkbits,
32                        size_t ivbits, unsigned int mode, uint64_t flags,
33                        const PROV_CIPHER_HW *hw)
34{
35    PROV_DES_CTX *ctx;
36
37    if (!ossl_prov_is_running())
38        return NULL;
39
40    ctx = OPENSSL_zalloc(sizeof(*ctx));
41    if (ctx != NULL)
42        ossl_cipher_generic_initkey(ctx, kbits, blkbits, ivbits, mode, flags,
43                                    hw, provctx);
44    return ctx;
45}
46
47static void *des_dupctx(void *ctx)
48{
49    PROV_DES_CTX *in = (PROV_DES_CTX *)ctx;
50    PROV_DES_CTX *ret;
51
52    if (!ossl_prov_is_running())
53        return NULL;
54
55    ret = OPENSSL_malloc(sizeof(*ret));
56    if (ret == NULL) {
57        ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
58        return NULL;
59    }
60    in->base.hw->copyctx(&ret->base, &in->base);
61
62    return ret;
63}
64
65static void des_freectx(void *vctx)
66{
67    PROV_DES_CTX *ctx = (PROV_DES_CTX *)vctx;
68
69    ossl_cipher_generic_reset_ctx((PROV_CIPHER_CTX *)vctx);
70    OPENSSL_clear_free(ctx,  sizeof(*ctx));
71}
72
73static int des_init(void *vctx, const unsigned char *key, size_t keylen,
74                    const unsigned char *iv, size_t ivlen,
75                    const OSSL_PARAM params[], int enc)
76{
77    PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
78
79    if (!ossl_prov_is_running())
80        return 0;
81
82    ctx->num = 0;
83    ctx->bufsz = 0;
84    ctx->enc = enc;
85
86    if (iv != NULL) {
87        if (!ossl_cipher_generic_initiv(ctx, iv, ivlen))
88            return 0;
89    } else if (ctx->iv_set) {
90        /* reset IV to keep compatibility with 1.1.1 */
91        memcpy(ctx->iv, ctx->oiv, ctx->ivlen);
92    }
93
94    if (key != NULL) {
95        if (keylen != ctx->keylen) {
96            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
97            return 0;
98        }
99        if (!ctx->hw->init(ctx, key, keylen))
100            return 0;
101        ctx->key_set = 1;
102    }
103    return ossl_cipher_generic_set_ctx_params(ctx, params);
104}
105
106static int des_einit(void *vctx, const unsigned char *key, size_t keylen,
107                     const unsigned char *iv, size_t ivlen,
108                     const OSSL_PARAM params[])
109{
110    return des_init(vctx, key, keylen, iv, ivlen, params, 1);
111}
112
113static int des_dinit(void *vctx, const unsigned char *key, size_t keylen,
114                     const unsigned char *iv, size_t ivlen,
115                     const OSSL_PARAM params[])
116{
117    return des_init(vctx, key, keylen, iv, ivlen, params, 0);
118}
119
120static int des_generatekey(PROV_CIPHER_CTX *ctx, void *ptr)
121{
122
123    DES_cblock *deskey = ptr;
124    size_t kl = ctx->keylen;
125
126    if (kl == 0 || RAND_priv_bytes_ex(ctx->libctx, ptr, kl, 0) <= 0)
127        return 0;
128    DES_set_odd_parity(deskey);
129    return 1;
130}
131
132CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_START(des)
133    OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_RANDOM_KEY, NULL, 0),
134CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_END(des)
135
136static int des_get_ctx_params(void *vctx, OSSL_PARAM params[])
137{
138    PROV_CIPHER_CTX  *ctx = (PROV_CIPHER_CTX *)vctx;
139    OSSL_PARAM *p;
140
141    if (!ossl_cipher_generic_get_ctx_params(vctx, params))
142        return 0;
143
144    p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_RANDOM_KEY);
145    if (p != NULL && !des_generatekey(ctx, p->data)) {
146        ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GENERATE_KEY);
147        return 0;
148    }
149    return 1;
150}
151
152#define IMPLEMENT_des_cipher(type, lcmode, UCMODE, flags,                      \
153                             kbits, blkbits, ivbits, block)                    \
154static OSSL_FUNC_cipher_newctx_fn type##_##lcmode##_newctx;                    \
155static void *des_##lcmode##_newctx(void *provctx)                              \
156{                                                                              \
157    return des_newctx(provctx, kbits, blkbits, ivbits,                         \
158                      EVP_CIPH_##UCMODE##_MODE, flags,                         \
159                      ossl_prov_cipher_hw_des_##lcmode());                          \
160}                                                                              \
161static OSSL_FUNC_cipher_get_params_fn des_##lcmode##_get_params;               \
162static int des_##lcmode##_get_params(OSSL_PARAM params[])                      \
163{                                                                              \
164    return ossl_cipher_generic_get_params(params, EVP_CIPH_##UCMODE##_MODE,    \
165                                          flags, kbits, blkbits, ivbits);      \
166}                                                                              \
167const OSSL_DISPATCH ossl_##des_##lcmode##_functions[] = {                      \
168    { OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))des_einit },              \
169    { OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))des_dinit },              \
170    { OSSL_FUNC_CIPHER_UPDATE,                                                 \
171      (void (*)(void))ossl_cipher_generic_##block##_update },                  \
172    { OSSL_FUNC_CIPHER_FINAL, (void (*)(void))ossl_cipher_generic_##block##_final },\
173    { OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))ossl_cipher_generic_cipher },   \
174    { OSSL_FUNC_CIPHER_NEWCTX,                                                 \
175      (void (*)(void))des_##lcmode##_newctx },                                 \
176    { OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void))des_dupctx },                   \
177    { OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))des_freectx },                 \
178    { OSSL_FUNC_CIPHER_GET_PARAMS,                                             \
179      (void (*)(void))des_##lcmode##_get_params },                             \
180    { OSSL_FUNC_CIPHER_GETTABLE_PARAMS,                                        \
181      (void (*)(void))ossl_cipher_generic_gettable_params },                   \
182    { OSSL_FUNC_CIPHER_GET_CTX_PARAMS, (void (*)(void))des_get_ctx_params },   \
183    { OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS,                                    \
184      (void (*)(void))des_gettable_ctx_params },                               \
185    { OSSL_FUNC_CIPHER_SET_CTX_PARAMS,                                         \
186     (void (*)(void))ossl_cipher_generic_set_ctx_params },                     \
187    { OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS,                                    \
188     (void (*)(void))ossl_cipher_generic_settable_ctx_params },                \
189    { 0, NULL }                                                                \
190}
191
192/* ossl_des_ecb_functions */
193IMPLEMENT_des_cipher(des, ecb, ECB, DES_FLAGS, 64, 64, 0, block);
194/* ossl_des_cbc_functions */
195IMPLEMENT_des_cipher(des, cbc, CBC, DES_FLAGS, 64, 64, 64, block);
196/* ossl_des_ofb64_functions */
197IMPLEMENT_des_cipher(des, ofb64, OFB, DES_FLAGS, 64, 8, 64, stream);
198/* ossl_des_cfb64_functions */
199IMPLEMENT_des_cipher(des, cfb64, CFB, DES_FLAGS, 64, 8, 64, stream);
200/* ossl_des_cfb1_functions */
201IMPLEMENT_des_cipher(des, cfb1, CFB, DES_FLAGS, 64, 8, 64, stream);
202/* ossl_des_cfb8_functions */
203IMPLEMENT_des_cipher(des, cfb8, CFB, DES_FLAGS, 64, 8, 64, stream);
204