xref: /openssl/crypto/evp/e_des.c (revision 4e720f12)
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  * 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 <stdio.h>
17 #include "internal/cryptlib.h"
18 #ifndef OPENSSL_NO_DES
19 # include <openssl/evp.h>
20 # include <openssl/objects.h>
21 # include "crypto/evp.h"
22 # include <openssl/des.h>
23 # include <openssl/rand.h>
24 # include "evp_local.h"
25 
26 typedef struct {
27     union {
28         OSSL_UNION_ALIGN;
29         DES_key_schedule ks;
30     } ks;
31     union {
32         void (*cbc) (const void *, void *, size_t,
33                      const DES_key_schedule *, unsigned char *);
34     } stream;
35 } EVP_DES_KEY;
36 
37 # if defined(AES_ASM) && (defined(__sparc) || defined(__sparc__))
38 /* ----------^^^ this is not a typo, just a way to detect that
39  * assembler support was in general requested... */
40 #  include "crypto/sparc_arch.h"
41 
42 #  define SPARC_DES_CAPABLE       (OPENSSL_sparcv9cap_P[1] & CFR_DES)
43 
44 void des_t4_key_expand(const void *key, DES_key_schedule *ks);
45 void des_t4_cbc_encrypt(const void *inp, void *out, size_t len,
46                         const DES_key_schedule *ks, unsigned char iv[8]);
47 void des_t4_cbc_decrypt(const void *inp, void *out, size_t len,
48                         const DES_key_schedule *ks, unsigned char iv[8]);
49 # endif
50 
51 static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
52                         const unsigned char *iv, int enc);
53 static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
54 
55 /*
56  * Because of various casts and different names can't use
57  * IMPLEMENT_BLOCK_CIPHER
58  */
59 
des_ecb_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out,const unsigned char * in,size_t inl)60 static int des_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
61                           const unsigned char *in, size_t inl)
62 {
63     BLOCK_CIPHER_ecb_loop()
64         DES_ecb_encrypt((DES_cblock *)(in + i), (DES_cblock *)(out + i),
65                         EVP_CIPHER_CTX_get_cipher_data(ctx),
66                         EVP_CIPHER_CTX_is_encrypting(ctx));
67     return 1;
68 }
69 
des_ofb_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out,const unsigned char * in,size_t inl)70 static int des_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
71                           const unsigned char *in, size_t inl)
72 {
73     while (inl >= EVP_MAXCHUNK) {
74         int num = EVP_CIPHER_CTX_get_num(ctx);
75         DES_ofb64_encrypt(in, out, (long)EVP_MAXCHUNK,
76                           EVP_CIPHER_CTX_get_cipher_data(ctx),
77                           (DES_cblock *)ctx->iv, &num);
78         EVP_CIPHER_CTX_set_num(ctx, num);
79         inl -= EVP_MAXCHUNK;
80         in += EVP_MAXCHUNK;
81         out += EVP_MAXCHUNK;
82     }
83     if (inl) {
84         int num = EVP_CIPHER_CTX_get_num(ctx);
85         DES_ofb64_encrypt(in, out, (long)inl,
86                           EVP_CIPHER_CTX_get_cipher_data(ctx),
87                           (DES_cblock *)ctx->iv, &num);
88         EVP_CIPHER_CTX_set_num(ctx, num);
89     }
90     return 1;
91 }
92 
des_cbc_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out,const unsigned char * in,size_t inl)93 static int des_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
94                           const unsigned char *in, size_t inl)
95 {
96     EVP_DES_KEY *dat = (EVP_DES_KEY *) EVP_CIPHER_CTX_get_cipher_data(ctx);
97 
98     if (dat->stream.cbc != NULL) {
99         (*dat->stream.cbc) (in, out, inl, &dat->ks.ks, ctx->iv);
100         return 1;
101     }
102     while (inl >= EVP_MAXCHUNK) {
103         DES_ncbc_encrypt(in, out, (long)EVP_MAXCHUNK,
104                          EVP_CIPHER_CTX_get_cipher_data(ctx),
105                          (DES_cblock *)ctx->iv,
106                          EVP_CIPHER_CTX_is_encrypting(ctx));
107         inl -= EVP_MAXCHUNK;
108         in += EVP_MAXCHUNK;
109         out += EVP_MAXCHUNK;
110     }
111     if (inl)
112         DES_ncbc_encrypt(in, out, (long)inl,
113                          EVP_CIPHER_CTX_get_cipher_data(ctx),
114                          (DES_cblock *)ctx->iv,
115                          EVP_CIPHER_CTX_is_encrypting(ctx));
116     return 1;
117 }
118 
des_cfb64_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out,const unsigned char * in,size_t inl)119 static int des_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
120                             const unsigned char *in, size_t inl)
121 {
122     while (inl >= EVP_MAXCHUNK) {
123         int num = EVP_CIPHER_CTX_get_num(ctx);
124         DES_cfb64_encrypt(in, out, (long)EVP_MAXCHUNK,
125                           EVP_CIPHER_CTX_get_cipher_data(ctx),
126                           (DES_cblock *)ctx->iv, &num,
127                           EVP_CIPHER_CTX_is_encrypting(ctx));
128         EVP_CIPHER_CTX_set_num(ctx, num);
129         inl -= EVP_MAXCHUNK;
130         in += EVP_MAXCHUNK;
131         out += EVP_MAXCHUNK;
132     }
133     if (inl) {
134         int num = EVP_CIPHER_CTX_get_num(ctx);
135         DES_cfb64_encrypt(in, out, (long)inl,
136                           EVP_CIPHER_CTX_get_cipher_data(ctx),
137                           (DES_cblock *)ctx->iv, &num,
138                           EVP_CIPHER_CTX_is_encrypting(ctx));
139         EVP_CIPHER_CTX_set_num(ctx, num);
140     }
141     return 1;
142 }
143 
144 /*
145  * Although we have a CFB-r implementation for DES, it doesn't pack the right
146  * way, so wrap it here
147  */
des_cfb1_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out,const unsigned char * in,size_t inl)148 static int des_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
149                            const unsigned char *in, size_t inl)
150 {
151     size_t n, chunk = EVP_MAXCHUNK / 8;
152     unsigned char c[1];
153     unsigned char d[1] = { 0 };  /* Appease Coverity */
154 
155     if (inl < chunk)
156         chunk = inl;
157 
158     while (inl && inl >= chunk) {
159         for (n = 0; n < chunk * 8; ++n) {
160             c[0] = (in[n / 8] & (1 << (7 - n % 8))) ? 0x80 : 0;
161             DES_cfb_encrypt(c, d, 1, 1, EVP_CIPHER_CTX_get_cipher_data(ctx),
162                             (DES_cblock *)ctx->iv,
163                             EVP_CIPHER_CTX_is_encrypting(ctx));
164             out[n / 8] =
165                 (out[n / 8] & ~(0x80 >> (unsigned int)(n % 8))) |
166                 ((d[0] & 0x80) >> (unsigned int)(n % 8));
167         }
168         inl -= chunk;
169         in += chunk;
170         out += chunk;
171         if (inl < chunk)
172             chunk = inl;
173     }
174 
175     return 1;
176 }
177 
des_cfb8_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out,const unsigned char * in,size_t inl)178 static int des_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
179                            const unsigned char *in, size_t inl)
180 {
181     while (inl >= EVP_MAXCHUNK) {
182         DES_cfb_encrypt(in, out, 8, (long)EVP_MAXCHUNK,
183                         EVP_CIPHER_CTX_get_cipher_data(ctx),
184                         (DES_cblock *)ctx->iv,
185                         EVP_CIPHER_CTX_is_encrypting(ctx));
186         inl -= EVP_MAXCHUNK;
187         in += EVP_MAXCHUNK;
188         out += EVP_MAXCHUNK;
189     }
190     if (inl)
191         DES_cfb_encrypt(in, out, 8, (long)inl,
192                         EVP_CIPHER_CTX_get_cipher_data(ctx),
193                         (DES_cblock *)ctx->iv,
194                         EVP_CIPHER_CTX_is_encrypting(ctx));
195     return 1;
196 }
197 
198 BLOCK_CIPHER_defs(des, EVP_DES_KEY, NID_des, 8, 8, 8, 64,
199                   EVP_CIPH_RAND_KEY, des_init_key, NULL,
200                   EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, des_ctrl)
201 
202     BLOCK_CIPHER_def_cfb(des, EVP_DES_KEY, NID_des, 8, 8, 1,
203                      EVP_CIPH_RAND_KEY, des_init_key, NULL,
204                      EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, des_ctrl)
205 
206     BLOCK_CIPHER_def_cfb(des, EVP_DES_KEY, NID_des, 8, 8, 8,
207                      EVP_CIPH_RAND_KEY, des_init_key, NULL,
208                      EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, des_ctrl)
209 
des_init_key(EVP_CIPHER_CTX * ctx,const unsigned char * key,const unsigned char * iv,int enc)210 static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
211                         const unsigned char *iv, int enc)
212 {
213     DES_cblock *deskey = (DES_cblock *)key;
214     EVP_DES_KEY *dat = (EVP_DES_KEY *) EVP_CIPHER_CTX_get_cipher_data(ctx);
215 
216     dat->stream.cbc = NULL;
217 # if defined(SPARC_DES_CAPABLE)
218     if (SPARC_DES_CAPABLE) {
219         int mode = EVP_CIPHER_CTX_get_mode(ctx);
220 
221         if (mode == EVP_CIPH_CBC_MODE) {
222             des_t4_key_expand(key, &dat->ks.ks);
223             dat->stream.cbc = enc ? des_t4_cbc_encrypt : des_t4_cbc_decrypt;
224             return 1;
225         }
226     }
227 # endif
228     DES_set_key_unchecked(deskey, EVP_CIPHER_CTX_get_cipher_data(ctx));
229     return 1;
230 }
231 
des_ctrl(EVP_CIPHER_CTX * c,int type,int arg,void * ptr)232 static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
233 {
234 
235     switch (type) {
236     case EVP_CTRL_RAND_KEY:
237         if (RAND_priv_bytes(ptr, 8) <= 0)
238             return 0;
239         DES_set_odd_parity((DES_cblock *)ptr);
240         return 1;
241 
242     default:
243         return -1;
244     }
245 }
246 
247 #endif
248