crypto/asn1/p5_pbev2.c

   1 /*
   2  * Copyright 1999-2021 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 #include <stdio.h>
  11 #include "internal/cryptlib.h"
  12 #include <openssl/asn1t.h>
  13 #include <openssl/core.h>
  14 #include <openssl/core_names.h>
  15 #include <openssl/x509.h>
  16 #include <openssl/rand.h>
  17
  18 /* PKCS#5 v2.0 password based encryption structures */
  19
  20 ASN1_SEQUENCE(PBE2PARAM) = {
  21         ASN1_SIMPLE(PBE2PARAM, keyfunc, X509_ALGOR),
  22         ASN1_SIMPLE(PBE2PARAM, encryption, X509_ALGOR)
  23 } ASN1_SEQUENCE_END(PBE2PARAM)
  24
  25 IMPLEMENT_ASN1_FUNCTIONS(PBE2PARAM)
  26
  27 ASN1_SEQUENCE(PBKDF2PARAM) = {
  28         ASN1_SIMPLE(PBKDF2PARAM, salt, ASN1_ANY),
  29         ASN1_SIMPLE(PBKDF2PARAM, iter, ASN1_INTEGER),
  30         ASN1_OPT(PBKDF2PARAM, keylength, ASN1_INTEGER),
  31         ASN1_OPT(PBKDF2PARAM, prf, X509_ALGOR)
  32 } ASN1_SEQUENCE_END(PBKDF2PARAM)
  33
  34 IMPLEMENT_ASN1_FUNCTIONS(PBKDF2PARAM)
  35
  36 /*
  37  * Return an algorithm identifier for a PKCS#5 v2.0 PBE algorithm: yes I know
  38  * this is horrible! Extended version to allow application supplied PRF NID
  39  * and IV.
  40  */
  41
  42 X509_ALGOR *PKCS5_pbe2_set_iv_ex(const EVP_CIPHER *cipher, int iter,
  43                                  unsigned char *salt, int saltlen,
  44                                  unsigned char *aiv, int prf_nid,
  45                                  OSSL_LIB_CTX *libctx)
  46 {
  47     X509_ALGOR *scheme = NULL, *ret = NULL;
  48     int alg_nid, keylen, ivlen;
  49     EVP_CIPHER_CTX *ctx = NULL;
  50     unsigned char iv[EVP_MAX_IV_LENGTH];
  51     PBE2PARAM *pbe2 = NULL;
  52
  53     alg_nid = EVP_CIPHER_type(cipher);
  54     if (alg_nid == NID_undef) {
  55         ERR_raise(ERR_LIB_ASN1, ASN1_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
  56         goto err;
  57     }
  58
  59     if ((pbe2 = PBE2PARAM_new()) == NULL)
  60         goto merr;
  61
  62     /* Setup the AlgorithmIdentifier for the encryption scheme */
  63     scheme = pbe2->encryption;
  64     scheme->algorithm = OBJ_nid2obj(alg_nid);
  65     if ((scheme->parameter = ASN1_TYPE_new()) == NULL)
  66         goto merr;
  67
  68     /* Create random IV */
  69     ivlen = EVP_CIPHER_iv_length(cipher);
  70     if (ivlen > 0) {
  71         if (aiv)
  72             memcpy(iv, aiv, ivlen);
  73         else if (RAND_bytes_ex(libctx, iv, ivlen, 0) <= 0)
  74             goto err;
  75     }
  76
  77     ctx = EVP_CIPHER_CTX_new();
  78     if (ctx == NULL)
  79         goto merr;
  80
  81     /* Dummy cipherinit to just setup the IV, and PRF */
  82     if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, iv, 0))
  83         goto err;
  84     if (EVP_CIPHER_param_to_asn1(ctx, scheme->parameter) <= 0) {
  85         ERR_raise(ERR_LIB_ASN1, ASN1_R_ERROR_SETTING_CIPHER_PARAMS);
  86         goto err;
  87     }
  88     /*
  89      * If prf NID unspecified see if cipher has a preference. An error is OK
  90      * here: just means use default PRF.
  91      */
  92     ERR_set_mark();
  93     if ((prf_nid == -1) &&
  94         EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_PBE_PRF_NID, 0, &prf_nid) <= 0) {
  95         prf_nid = NID_hmacWithSHA256;
  96     }
  97     ERR_pop_to_mark();
  98     EVP_CIPHER_CTX_free(ctx);
  99     ctx = NULL;
 100
 101     /* If its RC2 then we'd better setup the key length */
 102
 103     if (alg_nid == NID_rc2_cbc)
 104         keylen = EVP_CIPHER_key_length(cipher);
 105     else
 106         keylen = -1;
 107
 108     /* Setup keyfunc */
 109
 110     X509_ALGOR_free(pbe2->keyfunc);
 111
 112     pbe2->keyfunc = PKCS5_pbkdf2_set_ex(iter, salt, saltlen, prf_nid, keylen,
 113                                         libctx);
 114
 115     if (pbe2->keyfunc == NULL)
 116         goto merr;
 117
 118     /* Now set up top level AlgorithmIdentifier */
 119
 120     if ((ret = X509_ALGOR_new()) == NULL)
 121         goto merr;
 122
 123     ret->algorithm = OBJ_nid2obj(NID_pbes2);
 124
 125     /* Encode PBE2PARAM into parameter */
 126
 127     if (!ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(PBE2PARAM), pbe2,
 128                                  &ret->parameter))
 129          goto merr;
 130
 131     PBE2PARAM_free(pbe2);
 132     pbe2 = NULL;
 133
 134     return ret;
 135
 136  merr:
 137     ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
 138
 139  err:
 140     EVP_CIPHER_CTX_free(ctx);
 141     PBE2PARAM_free(pbe2);
 142     /* Note 'scheme' is freed as part of pbe2 */
 143     X509_ALGOR_free(ret);
 144
 145     return NULL;
 146 }
 147
 148 X509_ALGOR *PKCS5_pbe2_set_iv(const EVP_CIPHER *cipher, int iter,
 149                               unsigned char *salt, int saltlen,
 150                               unsigned char *aiv, int prf_nid)
 151 {
 152     return PKCS5_pbe2_set_iv_ex(cipher, iter, salt, saltlen, aiv, prf_nid,
 153                                 NULL);
 154 }
 155
 156 X509_ALGOR *PKCS5_pbe2_set(const EVP_CIPHER *cipher, int iter,
 157                            unsigned char *salt, int saltlen)
 158 {
 159     return PKCS5_pbe2_set_iv_ex(cipher, iter, salt, saltlen, NULL, -1,
 160                                 NULL);
 161 }
 162
 163
 164 X509_ALGOR *PKCS5_pbkdf2_set_ex(int iter, unsigned char *salt, int saltlen,
 165                                 int prf_nid, int keylen,
 166                                 OSSL_LIB_CTX *libctx)
 167 {
 168     X509_ALGOR *keyfunc = NULL;
 169     PBKDF2PARAM *kdf = NULL;
 170     ASN1_OCTET_STRING *osalt = NULL;
 171
 172     if ((kdf = PBKDF2PARAM_new()) == NULL)
 173         goto merr;
 174     if ((osalt = ASN1_OCTET_STRING_new()) == NULL)
 175         goto merr;
 176
 177     kdf->salt->value.octet_string = osalt;
 178     kdf->salt->type = V_ASN1_OCTET_STRING;
 179
 180     if (saltlen < 0)
 181         goto merr;
 182     if (saltlen == 0)
 183         saltlen = PKCS5_SALT_LEN;
 184     if ((osalt->data = OPENSSL_malloc(saltlen)) == NULL)
 185         goto merr;
 186
 187     osalt->length = saltlen;
 188
 189     if (salt)
 190         memcpy(osalt->data, salt, saltlen);
 191     else if (RAND_bytes_ex(libctx, osalt->data, saltlen, 0) <= 0)
 192         goto merr;
 193
 194     if (iter <= 0)
 195         iter = PKCS5_DEFAULT_ITER;
 196
 197     if (!ASN1_INTEGER_set(kdf->iter, iter))
 198         goto merr;
 199
 200     /* If have a key len set it up */
 201
 202     if (keylen > 0) {
 203         if ((kdf->keylength = ASN1_INTEGER_new()) == NULL)
 204             goto merr;
 205         if (!ASN1_INTEGER_set(kdf->keylength, keylen))
 206             goto merr;
 207     }
 208
 209     /* prf can stay NULL if we are using hmacWithSHA1 */
 210     if (prf_nid > 0 && prf_nid != NID_hmacWithSHA1) {
 211         kdf->prf = X509_ALGOR_new();
 212         if (kdf->prf == NULL)
 213             goto merr;
 214         X509_ALGOR_set0(kdf->prf, OBJ_nid2obj(prf_nid), V_ASN1_NULL, NULL);
 215     }
 216
 217     /* Finally setup the keyfunc structure */
 218
 219     keyfunc = X509_ALGOR_new();
 220     if (keyfunc == NULL)
 221         goto merr;
 222
 223     keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2);
 224
 225     /* Encode PBKDF2PARAM into parameter of pbe2 */
 226
 227     if (!ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(PBKDF2PARAM), kdf,
 228                                  &keyfunc->parameter))
 229          goto merr;
 230
 231     PBKDF2PARAM_free(kdf);
 232     return keyfunc;
 233
 234  merr:
 235     ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
 236     PBKDF2PARAM_free(kdf);
 237     X509_ALGOR_free(keyfunc);
 238     return NULL;
 239 }
 240
 241 X509_ALGOR *PKCS5_pbkdf2_set(int iter, unsigned char *salt, int saltlen,
 242                              int prf_nid, int keylen)
 243 {
 244     return PKCS5_pbkdf2_set_ex(iter, salt, saltlen, prf_nid, keylen, NULL);
 245 }
 246