providers/implementations/ciphers/cipher_tdes_common.c

   1 /*
   2  * Copyright 2019-2020 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 "prov/ciphercommon.h"
  17 #include "cipher_tdes.h"
  18 #include <openssl/rand.h>
  19 #include "prov/implementations.h"
  20 #include "prov/providercommon.h"
  21 #include "prov/providercommonerr.h"
  22
  23 void *tdes_newctx(void *provctx, int mode, size_t kbits, size_t blkbits,
  24                   size_t ivbits, uint64_t flags, const PROV_CIPHER_HW *hw)
  25 {
  26     PROV_TDES_CTX *tctx;
  27
  28     if (!ossl_prov_is_running())
  29         return NULL;
  30
  31     tctx = OPENSSL_zalloc(sizeof(*tctx));
  32     if (tctx != NULL)
  33         ossl_cipher_generic_initkey(tctx, kbits, blkbits, ivbits, mode, flags,
  34                                     hw, provctx);
  35     return tctx;
  36 }
  37
  38 void *tdes_dupctx(void *ctx)
  39 {
  40     PROV_TDES_CTX *in = (PROV_TDES_CTX *)ctx;
  41     PROV_TDES_CTX *ret;
  42
  43     if (!ossl_prov_is_running())
  44         return NULL;
  45
  46     ret = OPENSSL_malloc(sizeof(*ret));
  47     if (ret == NULL) {
  48         ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
  49         return NULL;
  50     }
  51     in->base.hw->copyctx(&ret->base, &in->base);
  52
  53     return ret;
  54 }
  55
  56 void tdes_freectx(void *vctx)
  57 {
  58     PROV_TDES_CTX *ctx = (PROV_TDES_CTX *)vctx;
  59
  60     ossl_cipher_generic_reset_ctx((PROV_CIPHER_CTX *)vctx);
  61     OPENSSL_clear_free(ctx,  sizeof(*ctx));
  62 }
  63
  64 static int tdes_init(void *vctx, const unsigned char *key, size_t keylen,
  65                      const unsigned char *iv, size_t ivlen, int enc)
  66 {
  67     PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
  68
  69     if (!ossl_prov_is_running())
  70         return 0;
  71
  72     ctx->num = 0;
  73     ctx->bufsz = 0;
  74     ctx->enc = enc;
  75
  76     if (iv != NULL) {
  77         if (!ossl_cipher_generic_initiv(ctx, iv, ivlen))
  78             return 0;
  79     }
  80
  81     if (key != NULL) {
  82         if (keylen != ctx->keylen) {
  83             ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEYLEN);
  84             return 0;
  85         }
  86         return ctx->hw->init(ctx, key, ctx->keylen);
  87     }
  88     return 1;
  89 }
  90
  91 int tdes_einit(void *vctx, const unsigned char *key, size_t keylen,
  92                const unsigned char *iv, size_t ivlen)
  93 {
  94     return tdes_init(vctx, key, keylen, iv, ivlen, 1);
  95 }
  96
  97 int tdes_dinit(void *vctx, const unsigned char *key, size_t keylen,
  98                const unsigned char *iv, size_t ivlen)
  99 {
 100     return tdes_init(vctx, key, keylen, iv, ivlen, 0);
 101 }
 102
 103 CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_START(tdes)
 104     OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_RANDOM_KEY, NULL, 0),
 105 CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_END(tdes)
 106
 107 static int tdes_generatekey(PROV_CIPHER_CTX *ctx, void *ptr)
 108 {
 109
 110     DES_cblock *deskey = ptr;
 111     size_t kl = ctx->keylen;
 112
 113     if (kl == 0 || RAND_priv_bytes_ex(ctx->libctx, ptr, kl) <= 0)
 114         return 0;
 115     DES_set_odd_parity(deskey);
 116     if (kl >= 16)
 117         DES_set_odd_parity(deskey + 1);
 118     if (kl >= 24) {
 119         DES_set_odd_parity(deskey + 2);
 120         return 1;
 121     }
 122     return 0;
 123 }
 124
 125 int tdes_get_ctx_params(void *vctx, OSSL_PARAM params[])
 126 {
 127     PROV_CIPHER_CTX  *ctx = (PROV_CIPHER_CTX *)vctx;
 128     OSSL_PARAM *p;
 129
 130     if (!ossl_cipher_generic_get_ctx_params(vctx, params))
 131         return 0;
 132
 133     p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_RANDOM_KEY);
 134     if (p != NULL && !tdes_generatekey(ctx, p->data)) {
 135         ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GENERATE_KEY);
 136         return 0;
 137     }
 138     return 1;
 139 }