[331] | 1 | /*
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| 2 | * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include "internal/cryptlib.h"
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| 12 | #include <openssl/asn1t.h>
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| 13 | #include <openssl/x509.h>
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| 14 | #include <openssl/rand.h>
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| 15 |
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| 16 | /* PKCS#5 v2.0 password based encryption structures */
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| 17 |
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| 18 | ASN1_SEQUENCE(PBE2PARAM) = {
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| 19 | ASN1_SIMPLE(PBE2PARAM, keyfunc, X509_ALGOR),
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| 20 | ASN1_SIMPLE(PBE2PARAM, encryption, X509_ALGOR)
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| 21 | } ASN1_SEQUENCE_END(PBE2PARAM)
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| 22 |
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| 23 | IMPLEMENT_ASN1_FUNCTIONS(PBE2PARAM)
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| 24 |
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| 25 | ASN1_SEQUENCE(PBKDF2PARAM) = {
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| 26 | ASN1_SIMPLE(PBKDF2PARAM, salt, ASN1_ANY),
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| 27 | ASN1_SIMPLE(PBKDF2PARAM, iter, ASN1_INTEGER),
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| 28 | ASN1_OPT(PBKDF2PARAM, keylength, ASN1_INTEGER),
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| 29 | ASN1_OPT(PBKDF2PARAM, prf, X509_ALGOR)
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| 30 | } ASN1_SEQUENCE_END(PBKDF2PARAM)
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| 31 |
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| 32 | IMPLEMENT_ASN1_FUNCTIONS(PBKDF2PARAM)
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| 33 |
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| 34 | /*
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| 35 | * Return an algorithm identifier for a PKCS#5 v2.0 PBE algorithm: yes I know
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| 36 | * this is horrible! Extended version to allow application supplied PRF NID
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| 37 | * and IV.
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| 38 | */
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| 39 |
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| 40 | X509_ALGOR *PKCS5_pbe2_set_iv(const EVP_CIPHER *cipher, int iter,
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| 41 | unsigned char *salt, int saltlen,
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| 42 | unsigned char *aiv, int prf_nid)
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| 43 | {
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| 44 | X509_ALGOR *scheme = NULL, *ret = NULL;
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| 45 | int alg_nid, keylen;
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| 46 | EVP_CIPHER_CTX *ctx = NULL;
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| 47 | unsigned char iv[EVP_MAX_IV_LENGTH];
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| 48 | PBE2PARAM *pbe2 = NULL;
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| 49 |
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| 50 | alg_nid = EVP_CIPHER_type(cipher);
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| 51 | if (alg_nid == NID_undef) {
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| 52 | ASN1err(ASN1_F_PKCS5_PBE2_SET_IV,
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| 53 | ASN1_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
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| 54 | goto err;
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| 55 | }
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| 56 |
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| 57 | if ((pbe2 = PBE2PARAM_new()) == NULL)
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| 58 | goto merr;
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| 59 |
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| 60 | /* Setup the AlgorithmIdentifier for the encryption scheme */
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| 61 | scheme = pbe2->encryption;
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| 62 | scheme->algorithm = OBJ_nid2obj(alg_nid);
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| 63 | if ((scheme->parameter = ASN1_TYPE_new()) == NULL)
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| 64 | goto merr;
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| 65 |
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| 66 | /* Create random IV */
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| 67 | if (EVP_CIPHER_iv_length(cipher)) {
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| 68 | if (aiv)
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| 69 | memcpy(iv, aiv, EVP_CIPHER_iv_length(cipher));
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| 70 | else if (RAND_bytes(iv, EVP_CIPHER_iv_length(cipher)) <= 0)
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| 71 | goto err;
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| 72 | }
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| 73 |
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| 74 | ctx = EVP_CIPHER_CTX_new();
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| 75 | if (ctx == NULL)
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| 76 | goto merr;
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| 77 |
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| 78 | /* Dummy cipherinit to just setup the IV, and PRF */
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| 79 | if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, iv, 0))
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| 80 | goto err;
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| 81 | if (EVP_CIPHER_param_to_asn1(ctx, scheme->parameter) < 0) {
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| 82 | ASN1err(ASN1_F_PKCS5_PBE2_SET_IV, ASN1_R_ERROR_SETTING_CIPHER_PARAMS);
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| 83 | goto err;
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| 84 | }
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| 85 | /*
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| 86 | * If prf NID unspecified see if cipher has a preference. An error is OK
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| 87 | * here: just means use default PRF.
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| 88 | */
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| 89 | if ((prf_nid == -1) &&
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| 90 | EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_PBE_PRF_NID, 0, &prf_nid) <= 0) {
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| 91 | ERR_clear_error();
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| 92 | prf_nid = NID_hmacWithSHA256;
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| 93 | }
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| 94 | EVP_CIPHER_CTX_free(ctx);
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| 95 | ctx = NULL;
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| 96 |
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| 97 | /* If its RC2 then we'd better setup the key length */
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| 98 |
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| 99 | if (alg_nid == NID_rc2_cbc)
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| 100 | keylen = EVP_CIPHER_key_length(cipher);
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| 101 | else
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| 102 | keylen = -1;
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| 103 |
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| 104 | /* Setup keyfunc */
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| 105 |
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| 106 | X509_ALGOR_free(pbe2->keyfunc);
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| 107 |
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| 108 | pbe2->keyfunc = PKCS5_pbkdf2_set(iter, salt, saltlen, prf_nid, keylen);
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| 109 |
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| 110 | if (!pbe2->keyfunc)
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| 111 | goto merr;
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| 112 |
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| 113 | /* Now set up top level AlgorithmIdentifier */
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| 114 |
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| 115 | if ((ret = X509_ALGOR_new()) == NULL)
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| 116 | goto merr;
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| 117 |
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| 118 | ret->algorithm = OBJ_nid2obj(NID_pbes2);
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| 119 |
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| 120 | /* Encode PBE2PARAM into parameter */
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| 121 |
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| 122 | if (!ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(PBE2PARAM), pbe2,
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| 123 | &ret->parameter))
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| 124 | goto merr;
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| 125 |
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| 126 | PBE2PARAM_free(pbe2);
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| 127 | pbe2 = NULL;
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| 128 |
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| 129 | return ret;
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| 130 |
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| 131 | merr:
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| 132 | ASN1err(ASN1_F_PKCS5_PBE2_SET_IV, ERR_R_MALLOC_FAILURE);
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| 133 |
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| 134 | err:
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| 135 | EVP_CIPHER_CTX_free(ctx);
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| 136 | PBE2PARAM_free(pbe2);
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| 137 | /* Note 'scheme' is freed as part of pbe2 */
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| 138 | X509_ALGOR_free(ret);
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| 139 |
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| 140 | return NULL;
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| 141 | }
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| 142 |
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| 143 | X509_ALGOR *PKCS5_pbe2_set(const EVP_CIPHER *cipher, int iter,
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| 144 | unsigned char *salt, int saltlen)
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| 145 | {
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| 146 | return PKCS5_pbe2_set_iv(cipher, iter, salt, saltlen, NULL, -1);
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| 147 | }
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| 148 |
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| 149 | X509_ALGOR *PKCS5_pbkdf2_set(int iter, unsigned char *salt, int saltlen,
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| 150 | int prf_nid, int keylen)
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| 151 | {
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| 152 | X509_ALGOR *keyfunc = NULL;
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| 153 | PBKDF2PARAM *kdf = NULL;
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| 154 | ASN1_OCTET_STRING *osalt = NULL;
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| 155 |
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| 156 | if ((kdf = PBKDF2PARAM_new()) == NULL)
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| 157 | goto merr;
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| 158 | if ((osalt = ASN1_OCTET_STRING_new()) == NULL)
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| 159 | goto merr;
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| 160 |
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| 161 | kdf->salt->value.octet_string = osalt;
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| 162 | kdf->salt->type = V_ASN1_OCTET_STRING;
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| 163 |
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| 164 | if (saltlen == 0)
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| 165 | saltlen = PKCS5_SALT_LEN;
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| 166 | if ((osalt->data = OPENSSL_malloc(saltlen)) == NULL)
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| 167 | goto merr;
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| 168 |
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| 169 | osalt->length = saltlen;
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| 170 |
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| 171 | if (salt)
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| 172 | memcpy(osalt->data, salt, saltlen);
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| 173 | else if (RAND_bytes(osalt->data, saltlen) <= 0)
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| 174 | goto merr;
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| 175 |
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| 176 | if (iter <= 0)
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| 177 | iter = PKCS5_DEFAULT_ITER;
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| 178 |
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| 179 | if (!ASN1_INTEGER_set(kdf->iter, iter))
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| 180 | goto merr;
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| 181 |
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| 182 | /* If have a key len set it up */
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| 183 |
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| 184 | if (keylen > 0) {
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| 185 | if ((kdf->keylength = ASN1_INTEGER_new()) == NULL)
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| 186 | goto merr;
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| 187 | if (!ASN1_INTEGER_set(kdf->keylength, keylen))
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| 188 | goto merr;
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| 189 | }
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| 190 |
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| 191 | /* prf can stay NULL if we are using hmacWithSHA1 */
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| 192 | if (prf_nid > 0 && prf_nid != NID_hmacWithSHA1) {
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| 193 | kdf->prf = X509_ALGOR_new();
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| 194 | if (kdf->prf == NULL)
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| 195 | goto merr;
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| 196 | X509_ALGOR_set0(kdf->prf, OBJ_nid2obj(prf_nid), V_ASN1_NULL, NULL);
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| 197 | }
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| 198 |
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| 199 | /* Finally setup the keyfunc structure */
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| 200 |
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| 201 | keyfunc = X509_ALGOR_new();
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| 202 | if (keyfunc == NULL)
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| 203 | goto merr;
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| 204 |
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| 205 | keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2);
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| 206 |
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| 207 | /* Encode PBKDF2PARAM into parameter of pbe2 */
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| 208 |
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| 209 | if (!ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(PBKDF2PARAM), kdf,
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| 210 | &keyfunc->parameter))
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| 211 | goto merr;
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| 212 |
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| 213 | PBKDF2PARAM_free(kdf);
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| 214 | return keyfunc;
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| 215 |
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| 216 | merr:
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| 217 | ASN1err(ASN1_F_PKCS5_PBKDF2_SET, ERR_R_MALLOC_FAILURE);
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| 218 | PBKDF2PARAM_free(kdf);
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| 219 | X509_ALGOR_free(keyfunc);
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| 220 | return NULL;
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| 221 | }
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