crypto/evp/e_des3.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[3];
  30     } ks;
  31     union {
  32         void (*cbc) (const void *, void *, size_t,
  33                      const DES_key_schedule *, unsigned char *);
  34     } stream;
  35 } DES_EDE_KEY;
  36 # define ks1 ks.ks[0]
  37 # define ks2 ks.ks[1]
  38 # define ks3 ks.ks[2]
  39
  40 # if defined(AES_ASM) && (defined(__sparc) || defined(__sparc__))
  41 /* ---------^^^ this is not a typo, just a way to detect that
  42  * assembler support was in general requested... */
  43 #  include "sparc_arch.h"
  44
  45 extern unsigned int OPENSSL_sparcv9cap_P[];
  46
  47 #  define SPARC_DES_CAPABLE       (OPENSSL_sparcv9cap_P[1] & CFR_DES)
  48
  49 void des_t4_key_expand(const void *key, DES_key_schedule *ks);
  50 void des_t4_ede3_cbc_encrypt(const void *inp, void *out, size_t len,
  51                              const DES_key_schedule ks[3], unsigned char iv[8]);
  52 void des_t4_ede3_cbc_decrypt(const void *inp, void *out, size_t len,
  53                              const DES_key_schedule ks[3], unsigned char iv[8]);
  54 # endif
  55
  56 static int des_ede_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  57                             const unsigned char *iv, int enc);
  58
  59 static int des_ede3_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  60                              const unsigned char *iv, int enc);
  61
  62 static int des3_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);
  63
  64 # define data(ctx) EVP_C_DATA(DES_EDE_KEY,ctx)
  65
  66 /*
  67  * Because of various casts and different args can't use
  68  * IMPLEMENT_BLOCK_CIPHER
  69  */
  70
  71 static int des_ede_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  72                               const unsigned char *in, size_t inl)
  73 {
  74     BLOCK_CIPHER_ecb_loop()
  75         DES_ecb3_encrypt((const_DES_cblock *)(in + i),
  76                          (DES_cblock *)(out + i),
  77                          &data(ctx)->ks1, &data(ctx)->ks2,
  78                          &data(ctx)->ks3, EVP_CIPHER_CTX_encrypting(ctx));
  79     return 1;
  80 }
  81
  82 static int des_ede_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  83                               const unsigned char *in, size_t inl)
  84 {
  85     while (inl >= EVP_MAXCHUNK) {
  86         int num = EVP_CIPHER_CTX_num(ctx);
  87         DES_ede3_ofb64_encrypt(in, out, (long)EVP_MAXCHUNK,
  88                                &data(ctx)->ks1, &data(ctx)->ks2,
  89                                &data(ctx)->ks3,
  90                                (DES_cblock *)ctx->iv,
  91                                &num);
  92         EVP_CIPHER_CTX_set_num(ctx, num);
  93         inl -= EVP_MAXCHUNK;
  94         in += EVP_MAXCHUNK;
  95         out += EVP_MAXCHUNK;
  96     }
  97     if (inl) {
  98         int num = EVP_CIPHER_CTX_num(ctx);
  99         DES_ede3_ofb64_encrypt(in, out, (long)inl,
 100                                &data(ctx)->ks1, &data(ctx)->ks2,
 101                                &data(ctx)->ks3,
 102                                (DES_cblock *)ctx->iv,
 103                                &num);
 104         EVP_CIPHER_CTX_set_num(ctx, num);
 105     }
 106     return 1;
 107 }
 108
 109 static int des_ede_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 110                               const unsigned char *in, size_t inl)
 111 {
 112     DES_EDE_KEY *dat = data(ctx);
 113
 114     if (dat->stream.cbc != NULL) {
 115         (*dat->stream.cbc) (in, out, inl, dat->ks.ks,
 116                             ctx->iv);
 117         return 1;
 118     }
 119
 120     while (inl >= EVP_MAXCHUNK) {
 121         DES_ede3_cbc_encrypt(in, out, (long)EVP_MAXCHUNK,
 122                              &dat->ks1, &dat->ks2, &dat->ks3,
 123                              (DES_cblock *)ctx->iv,
 124                              EVP_CIPHER_CTX_encrypting(ctx));
 125         inl -= EVP_MAXCHUNK;
 126         in += EVP_MAXCHUNK;
 127         out += EVP_MAXCHUNK;
 128     }
 129     if (inl)
 130         DES_ede3_cbc_encrypt(in, out, (long)inl,
 131                              &dat->ks1, &dat->ks2, &dat->ks3,
 132                              (DES_cblock *)ctx->iv,
 133                              EVP_CIPHER_CTX_encrypting(ctx));
 134     return 1;
 135 }
 136
 137 static int des_ede_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 138                                 const unsigned char *in, size_t inl)
 139 {
 140     while (inl >= EVP_MAXCHUNK) {
 141         int num = EVP_CIPHER_CTX_num(ctx);
 142         DES_ede3_cfb64_encrypt(in, out, (long)EVP_MAXCHUNK,
 143                                &data(ctx)->ks1, &data(ctx)->ks2,
 144                                &data(ctx)->ks3, (DES_cblock *)ctx->iv,
 145                                &num, EVP_CIPHER_CTX_encrypting(ctx));
 146         EVP_CIPHER_CTX_set_num(ctx, num);
 147         inl -= EVP_MAXCHUNK;
 148         in += EVP_MAXCHUNK;
 149         out += EVP_MAXCHUNK;
 150     }
 151     if (inl) {
 152         int num = EVP_CIPHER_CTX_num(ctx);
 153         DES_ede3_cfb64_encrypt(in, out, (long)inl,
 154                                &data(ctx)->ks1, &data(ctx)->ks2,
 155                                &data(ctx)->ks3, (DES_cblock *)ctx->iv,
 156                                &num, EVP_CIPHER_CTX_encrypting(ctx));
 157         EVP_CIPHER_CTX_set_num(ctx, num);
 158     }
 159     return 1;
 160 }
 161
 162 /*
 163  * Although we have a CFB-r implementation for 3-DES, it doesn't pack the
 164  * right way, so wrap it here
 165  */
 166 static int des_ede3_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 167                                 const unsigned char *in, size_t inl)
 168 {
 169     size_t n;
 170     unsigned char c[1], d[1];
 171
 172     if (!EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
 173             inl *= 8;
 174     for (n = 0; n < inl; ++n) {
 175         c[0] = (in[n / 8] & (1 << (7 - n % 8))) ? 0x80 : 0;
 176         DES_ede3_cfb_encrypt(c, d, 1, 1,
 177                              &data(ctx)->ks1, &data(ctx)->ks2,
 178                              &data(ctx)->ks3, (DES_cblock *)ctx->iv,
 179                              EVP_CIPHER_CTX_encrypting(ctx));
 180         out[n / 8] = (out[n / 8] & ~(0x80 >> (unsigned int)(n % 8)))
 181             | ((d[0] & 0x80) >> (unsigned int)(n % 8));
 182     }
 183
 184     return 1;
 185 }
 186
 187 static int des_ede3_cfb8_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 188                                 const unsigned char *in, size_t inl)
 189 {
 190     while (inl >= EVP_MAXCHUNK) {
 191         DES_ede3_cfb_encrypt(in, out, 8, (long)EVP_MAXCHUNK,
 192                              &data(ctx)->ks1, &data(ctx)->ks2,
 193                              &data(ctx)->ks3, (DES_cblock *)ctx->iv,
 194                              EVP_CIPHER_CTX_encrypting(ctx));
 195         inl -= EVP_MAXCHUNK;
 196         in += EVP_MAXCHUNK;
 197         out += EVP_MAXCHUNK;
 198     }
 199     if (inl)
 200         DES_ede3_cfb_encrypt(in, out, 8, (long)inl,
 201                              &data(ctx)->ks1, &data(ctx)->ks2,
 202                              &data(ctx)->ks3, (DES_cblock *)ctx->iv,
 203                              EVP_CIPHER_CTX_encrypting(ctx));
 204     return 1;
 205 }
 206
 207 BLOCK_CIPHER_defs(des_ede, DES_EDE_KEY, NID_des_ede, 8, 16, 8, 64,
 208                   EVP_CIPH_RAND_KEY | EVP_CIPH_FLAG_DEFAULT_ASN1,
 209                   des_ede_init_key, NULL, NULL, NULL, des3_ctrl)
 210 # define des_ede3_cfb64_cipher des_ede_cfb64_cipher
 211 # define des_ede3_ofb_cipher des_ede_ofb_cipher
 212 # define des_ede3_cbc_cipher des_ede_cbc_cipher
 213 # define des_ede3_ecb_cipher des_ede_ecb_cipher
 214     BLOCK_CIPHER_defs(des_ede3, DES_EDE_KEY, NID_des_ede3, 8, 24, 8, 64,
 215                   EVP_CIPH_RAND_KEY | EVP_CIPH_FLAG_DEFAULT_ASN1,
 216                   des_ede3_init_key, NULL, NULL, NULL, des3_ctrl)
 217
 218     BLOCK_CIPHER_def_cfb(des_ede3, DES_EDE_KEY, NID_des_ede3, 24, 8, 1,
 219                      EVP_CIPH_RAND_KEY | EVP_CIPH_FLAG_DEFAULT_ASN1,
 220                      des_ede3_init_key, NULL, NULL, NULL, des3_ctrl)
 221
 222     BLOCK_CIPHER_def_cfb(des_ede3, DES_EDE_KEY, NID_des_ede3, 24, 8, 8,
 223                      EVP_CIPH_RAND_KEY | EVP_CIPH_FLAG_DEFAULT_ASN1,
 224                      des_ede3_init_key, NULL, NULL, NULL, des3_ctrl)
 225
 226 static int des_ede_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 227                             const unsigned char *iv, int enc)
 228 {
 229     DES_cblock *deskey = (DES_cblock *)key;
 230     DES_EDE_KEY *dat = data(ctx);
 231
 232     dat->stream.cbc = NULL;
 233 # if defined(SPARC_DES_CAPABLE)
 234     if (SPARC_DES_CAPABLE) {
 235         int mode = EVP_CIPHER_CTX_mode(ctx);
 236
 237         if (mode == EVP_CIPH_CBC_MODE) {
 238             des_t4_key_expand(&deskey[0], &dat->ks1);
 239             des_t4_key_expand(&deskey[1], &dat->ks2);
 240             memcpy(&dat->ks3, &dat->ks1, sizeof(dat->ks1));
 241             dat->stream.cbc = enc ? des_t4_ede3_cbc_encrypt :
 242                 des_t4_ede3_cbc_decrypt;
 243             return 1;
 244         }
 245     }
 246 # endif
 247     DES_set_key_unchecked(&deskey[0], &dat->ks1);
 248     DES_set_key_unchecked(&deskey[1], &dat->ks2);
 249     memcpy(&dat->ks3, &dat->ks1, sizeof(dat->ks1));
 250     return 1;
 251 }
 252
 253 static int des_ede3_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 254                              const unsigned char *iv, int enc)
 255 {
 256     DES_cblock *deskey = (DES_cblock *)key;
 257     DES_EDE_KEY *dat = data(ctx);
 258
 259     dat->stream.cbc = NULL;
 260 # if defined(SPARC_DES_CAPABLE)
 261     if (SPARC_DES_CAPABLE) {
 262         int mode = EVP_CIPHER_CTX_mode(ctx);
 263
 264         if (mode == EVP_CIPH_CBC_MODE) {
 265             des_t4_key_expand(&deskey[0], &dat->ks1);
 266             des_t4_key_expand(&deskey[1], &dat->ks2);
 267             des_t4_key_expand(&deskey[2], &dat->ks3);
 268             dat->stream.cbc = enc ? des_t4_ede3_cbc_encrypt :
 269                 des_t4_ede3_cbc_decrypt;
 270             return 1;
 271         }
 272     }
 273 # endif
 274     DES_set_key_unchecked(&deskey[0], &dat->ks1);
 275     DES_set_key_unchecked(&deskey[1], &dat->ks2);
 276     DES_set_key_unchecked(&deskey[2], &dat->ks3);
 277     return 1;
 278 }
 279
 280 static int des3_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
 281 {
 282
 283     DES_cblock *deskey = ptr;
 284     int kl;
 285
 286     switch (type) {
 287     case EVP_CTRL_RAND_KEY:
 288         kl = EVP_CIPHER_CTX_key_length(ctx);
 289         if (kl < 0 || RAND_priv_bytes(ptr, kl) <= 0)
 290             return 0;
 291         DES_set_odd_parity(deskey);
 292         if (kl >= 16)
 293             DES_set_odd_parity(deskey + 1);
 294         if (kl >= 24)
 295             DES_set_odd_parity(deskey + 2);
 296         return 1;
 297
 298     default:
 299         return -1;
 300     }
 301 }
 302
 303 const EVP_CIPHER *EVP_des_ede(void)
 304 {
 305     return &des_ede_ecb;
 306 }
 307
 308 const EVP_CIPHER *EVP_des_ede3(void)
 309 {
 310     return &des_ede3_ecb;
 311 }
 312
 313
 314 # include <openssl/sha.h>
 315
 316 static const unsigned char wrap_iv[8] =
 317     { 0x4a, 0xdd, 0xa2, 0x2c, 0x79, 0xe8, 0x21, 0x05 };
 318
 319 static int des_ede3_unwrap(EVP_CIPHER_CTX *ctx, unsigned char *out,
 320                            const unsigned char *in, size_t inl)
 321 {
 322     unsigned char icv[8], iv[8], sha1tmp[SHA_DIGEST_LENGTH];
 323     int rv = -1;
 324     if (inl < 24)
 325         return -1;
 326     if (out == NULL)
 327         return inl - 16;
 328     memcpy(ctx->iv, wrap_iv, 8);
 329     /* Decrypt first block which will end up as icv */
 330     des_ede_cbc_cipher(ctx, icv, in, 8);
 331     /* Decrypt central blocks */
 332     /*
 333      * If decrypting in place move whole output along a block so the next
 334      * des_ede_cbc_cipher is in place.
 335      */
 336     if (out == in) {
 337         memmove(out, out + 8, inl - 8);
 338         in -= 8;
 339     }
 340     des_ede_cbc_cipher(ctx, out, in + 8, inl - 16);
 341     /* Decrypt final block which will be IV */
 342     des_ede_cbc_cipher(ctx, iv, in + inl - 8, 8);
 343     /* Reverse order of everything */
 344     BUF_reverse(icv, NULL, 8);
 345     BUF_reverse(out, NULL, inl - 16);
 346     BUF_reverse(ctx->iv, iv, 8);
 347     /* Decrypt again using new IV */
 348     des_ede_cbc_cipher(ctx, out, out, inl - 16);
 349     des_ede_cbc_cipher(ctx, icv, icv, 8);
 350     /* Work out SHA1 hash of first portion */
 351     SHA1(out, inl - 16, sha1tmp);
 352
 353     if (!CRYPTO_memcmp(sha1tmp, icv, 8))
 354         rv = inl - 16;
 355     OPENSSL_cleanse(icv, 8);
 356     OPENSSL_cleanse(sha1tmp, SHA_DIGEST_LENGTH);
 357     OPENSSL_cleanse(iv, 8);
 358     OPENSSL_cleanse(ctx->iv, 8);
 359     if (rv == -1)
 360         OPENSSL_cleanse(out, inl - 16);
 361
 362     return rv;
 363 }
 364
 365 static int des_ede3_wrap(EVP_CIPHER_CTX *ctx, unsigned char *out,
 366                          const unsigned char *in, size_t inl)
 367 {
 368     unsigned char sha1tmp[SHA_DIGEST_LENGTH];
 369     if (out == NULL)
 370         return inl + 16;
 371     /* Copy input to output buffer + 8 so we have space for IV */
 372     memmove(out + 8, in, inl);
 373     /* Work out ICV */
 374     SHA1(in, inl, sha1tmp);
 375     memcpy(out + inl + 8, sha1tmp, 8);
 376     OPENSSL_cleanse(sha1tmp, SHA_DIGEST_LENGTH);
 377     /* Generate random IV */
 378     if (RAND_bytes(ctx->iv, 8) <= 0)
 379         return -1;
 380     memcpy(out, ctx->iv, 8);
 381     /* Encrypt everything after IV in place */
 382     des_ede_cbc_cipher(ctx, out + 8, out + 8, inl + 8);
 383     BUF_reverse(out, NULL, inl + 16);
 384     memcpy(ctx->iv, wrap_iv, 8);
 385     des_ede_cbc_cipher(ctx, out, out, inl + 16);
 386     return inl + 16;
 387 }
 388
 389 static int des_ede3_wrap_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 390                                 const unsigned char *in, size_t inl)
 391 {
 392     /*
 393      * Sanity check input length: we typically only wrap keys so EVP_MAXCHUNK
 394      * is more than will ever be needed. Also input length must be a multiple
 395      * of 8 bits.
 396      */
 397     if (inl >= EVP_MAXCHUNK || inl % 8)
 398         return -1;
 399
 400     if (ossl_is_partially_overlapping(out, in, inl)) {
 401         ERR_raise(ERR_LIB_EVP, EVP_R_PARTIALLY_OVERLAPPING);
 402         return 0;
 403     }
 404
 405     if (EVP_CIPHER_CTX_encrypting(ctx))
 406         return des_ede3_wrap(ctx, out, in, inl);
 407     else
 408         return des_ede3_unwrap(ctx, out, in, inl);
 409 }
 410
 411 static const EVP_CIPHER des3_wrap = {
 412     NID_id_smime_alg_CMS3DESwrap,
 413     8, 24, 0,
 414     EVP_CIPH_WRAP_MODE | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER
 415         | EVP_CIPH_FLAG_DEFAULT_ASN1,
 416     des_ede3_init_key, des_ede3_wrap_cipher,
 417     NULL,
 418     sizeof(DES_EDE_KEY),
 419     NULL, NULL, NULL, NULL
 420 };
 421
 422 const EVP_CIPHER *EVP_des_ede3_wrap(void)
 423 {
 424     return &des3_wrap;
 425 }
 426
 427 #endif