crypto/evp/e_des.c

   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
  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
  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
  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
 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  */
 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
 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
 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
 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