crypto/evp/e_des.c

   1 /*
   2  * Copyright 1995-2020 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 "sparc_arch.h"
  41
  42 extern unsigned int OPENSSL_sparcv9cap_P[];
  43
  44 #  define SPARC_DES_CAPABLE       (OPENSSL_sparcv9cap_P[1] & CFR_DES)
  45
  46 void des_t4_key_expand(const void *key, DES_key_schedule *ks);
  47 void des_t4_cbc_encrypt(const void *inp, void *out, size_t len,
  48                         const DES_key_schedule *ks, unsigned char iv[8]);
  49 void des_t4_cbc_decrypt(const void *inp, void *out, size_t len,
  50                         const DES_key_schedule *ks, unsigned char iv[8]);
  51 # endif
  52
  53 static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  54                         const unsigned char *iv, int enc);
  55 static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
  56
  57 /*
  58  * Because of various casts and different names can't use
  59  * IMPLEMENT_BLOCK_CIPHER
  60  */
  61
  62 static int des_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  63                           const unsigned char *in, size_t inl)
  64 {
  65     BLOCK_CIPHER_ecb_loop()
  66         DES_ecb_encrypt((DES_cblock *)(in + i), (DES_cblock *)(out + i),
  67                         EVP_CIPHER_CTX_get_cipher_data(ctx),
  68                         EVP_CIPHER_CTX_is_encrypting(ctx));
  69     return 1;
  70 }
  71
  72 static int des_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  73                           const unsigned char *in, size_t inl)
  74 {
  75     while (inl >= EVP_MAXCHUNK) {
  76         int num = EVP_CIPHER_CTX_get_num(ctx);
  77         DES_ofb64_encrypt(in, out, (long)EVP_MAXCHUNK,
  78                           EVP_CIPHER_CTX_get_cipher_data(ctx),
  79                           (DES_cblock *)ctx->iv, &num);
  80         EVP_CIPHER_CTX_set_num(ctx, num);
  81         inl -= EVP_MAXCHUNK;
  82         in += EVP_MAXCHUNK;
  83         out += EVP_MAXCHUNK;
  84     }
  85     if (inl) {
  86         int num = EVP_CIPHER_CTX_get_num(ctx);
  87         DES_ofb64_encrypt(in, out, (long)inl,
  88                           EVP_CIPHER_CTX_get_cipher_data(ctx),
  89                           (DES_cblock *)ctx->iv, &num);
  90         EVP_CIPHER_CTX_set_num(ctx, num);
  91     }
  92     return 1;
  93 }
  94
  95 static int des_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  96                           const unsigned char *in, size_t inl)
  97 {
  98     EVP_DES_KEY *dat = (EVP_DES_KEY *) EVP_CIPHER_CTX_get_cipher_data(ctx);
  99
 100     if (dat->stream.cbc != NULL) {
 101         (*dat->stream.cbc) (in, out, inl, &dat->ks.ks, ctx->iv);
 102         return 1;
 103     }
 104     while (inl >= EVP_MAXCHUNK) {
 105         DES_ncbc_encrypt(in, out, (long)EVP_MAXCHUNK,
 106                          EVP_CIPHER_CTX_get_cipher_data(ctx),
 107                          (DES_cblock *)ctx->iv,
 108                          EVP_CIPHER_CTX_is_encrypting(ctx));
 109         inl -= EVP_MAXCHUNK;
 110         in += EVP_MAXCHUNK;
 111         out += EVP_MAXCHUNK;
 112     }
 113     if (inl)
 114         DES_ncbc_encrypt(in, out, (long)inl,
 115                          EVP_CIPHER_CTX_get_cipher_data(ctx),
 116                          (DES_cblock *)ctx->iv,
 117                          EVP_CIPHER_CTX_is_encrypting(ctx));
 118     return 1;
 119 }
 120
 121 static int des_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 122                             const unsigned char *in, size_t inl)
 123 {
 124     while (inl >= EVP_MAXCHUNK) {
 125         int num = EVP_CIPHER_CTX_get_num(ctx);
 126         DES_cfb64_encrypt(in, out, (long)EVP_MAXCHUNK,
 127                           EVP_CIPHER_CTX_get_cipher_data(ctx),
 128                           (DES_cblock *)ctx->iv, &num,
 129                           EVP_CIPHER_CTX_is_encrypting(ctx));
 130         EVP_CIPHER_CTX_set_num(ctx, num);
 131         inl -= EVP_MAXCHUNK;
 132         in += EVP_MAXCHUNK;
 133         out += EVP_MAXCHUNK;
 134     }
 135     if (inl) {
 136         int num = EVP_CIPHER_CTX_get_num(ctx);
 137         DES_cfb64_encrypt(in, out, (long)inl,
 138                           EVP_CIPHER_CTX_get_cipher_data(ctx),
 139                           (DES_cblock *)ctx->iv, &num,
 140                           EVP_CIPHER_CTX_is_encrypting(ctx));
 141         EVP_CIPHER_CTX_set_num(ctx, num);
 142     }
 143     return 1;
 144 }
 145
 146 /*
 147  * Although we have a CFB-r implementation for DES, it doesn't pack the right
 148  * way, so wrap it here
 149  */
 150 static int des_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 151                            const unsigned char *in, size_t inl)
 152 {
 153     size_t n, chunk = EVP_MAXCHUNK / 8;
 154     unsigned char c[1], d[1];
 155
 156     if (inl < chunk)
 157         chunk = inl;
 158
 159     while (inl && inl >= chunk) {
 160         for (n = 0; n < chunk * 8; ++n) {
 161             c[0] = (in[n / 8] & (1 << (7 - n % 8))) ? 0x80 : 0;
 162             DES_cfb_encrypt(c, d, 1, 1, EVP_CIPHER_CTX_get_cipher_data(ctx),
 163                             (DES_cblock *)ctx->iv,
 164                             EVP_CIPHER_CTX_is_encrypting(ctx));
 165             out[n / 8] =
 166                 (out[n / 8] & ~(0x80 >> (unsigned int)(n % 8))) |
 167                 ((d[0] & 0x80) >> (unsigned int)(n % 8));
 168         }
 169         inl -= chunk;
 170         in += chunk;
 171         out += chunk;
 172         if (inl < chunk)
 173             chunk = inl;
 174     }
 175
 176     return 1;
 177 }
 178
 179 static int des_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 180                            const unsigned char *in, size_t inl)
 181 {
 182     while (inl >= EVP_MAXCHUNK) {
 183         DES_cfb_encrypt(in, out, 8, (long)EVP_MAXCHUNK,
 184                         EVP_CIPHER_CTX_get_cipher_data(ctx),
 185                         (DES_cblock *)ctx->iv,
 186                         EVP_CIPHER_CTX_is_encrypting(ctx));
 187         inl -= EVP_MAXCHUNK;
 188         in += EVP_MAXCHUNK;
 189         out += EVP_MAXCHUNK;
 190     }
 191     if (inl)
 192         DES_cfb_encrypt(in, out, 8, (long)inl,
 193                         EVP_CIPHER_CTX_get_cipher_data(ctx),
 194                         (DES_cblock *)ctx->iv,
 195                         EVP_CIPHER_CTX_is_encrypting(ctx));
 196     return 1;
 197 }
 198
 199 BLOCK_CIPHER_defs(des, EVP_DES_KEY, NID_des, 8, 8, 8, 64,
 200                   EVP_CIPH_RAND_KEY, des_init_key, NULL,
 201                   EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, des_ctrl)
 202
 203     BLOCK_CIPHER_def_cfb(des, EVP_DES_KEY, NID_des, 8, 8, 1,
 204                      EVP_CIPH_RAND_KEY, des_init_key, NULL,
 205                      EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, des_ctrl)
 206
 207     BLOCK_CIPHER_def_cfb(des, EVP_DES_KEY, NID_des, 8, 8, 8,
 208                      EVP_CIPH_RAND_KEY, des_init_key, NULL,
 209                      EVP_CIPHER_set_asn1_iv, EVP_CIPHER_get_asn1_iv, des_ctrl)
 210
 211 static int des_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 212                         const unsigned char *iv, int enc)
 213 {
 214     DES_cblock *deskey = (DES_cblock *)key;
 215     EVP_DES_KEY *dat = (EVP_DES_KEY *) EVP_CIPHER_CTX_get_cipher_data(ctx);
 216
 217     dat->stream.cbc = NULL;
 218 # if defined(SPARC_DES_CAPABLE)
 219     if (SPARC_DES_CAPABLE) {
 220         int mode = EVP_CIPHER_CTX_get_mode(ctx);
 221
 222         if (mode == EVP_CIPH_CBC_MODE) {
 223             des_t4_key_expand(key, &dat->ks.ks);
 224             dat->stream.cbc = enc ? des_t4_cbc_encrypt : des_t4_cbc_decrypt;
 225             return 1;
 226         }
 227     }
 228 # endif
 229     DES_set_key_unchecked(deskey, EVP_CIPHER_CTX_get_cipher_data(ctx));
 230     return 1;
 231 }
 232
 233 static int des_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)
 234 {
 235
 236     switch (type) {
 237     case EVP_CTRL_RAND_KEY:
 238         if (RAND_priv_bytes(ptr, 8) <= 0)
 239             return 0;
 240         DES_set_odd_parity((DES_cblock *)ptr);
 241         return 1;
 242
 243     default:
 244         return -1;
 245     }
 246 }
 247
 248 #endif