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
