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/*
* Copyright 1999-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/x509.h>
#include <openssl/rand.h>
/* PKCS#5 v2.0 password based encryption structures */
ASN1_SEQUENCE(PBE2PARAM) = {
ASN1_SIMPLE(PBE2PARAM, keyfunc, X509_ALGOR),
ASN1_SIMPLE(PBE2PARAM, encryption, X509_ALGOR)
} ASN1_SEQUENCE_END(PBE2PARAM)
IMPLEMENT_ASN1_FUNCTIONS(PBE2PARAM)
ASN1_SEQUENCE(PBKDF2PARAM) = {
ASN1_SIMPLE(PBKDF2PARAM, salt, ASN1_ANY),
ASN1_SIMPLE(PBKDF2PARAM, iter, ASN1_INTEGER),
ASN1_OPT(PBKDF2PARAM, keylength, ASN1_INTEGER),
ASN1_OPT(PBKDF2PARAM, prf, X509_ALGOR)
} ASN1_SEQUENCE_END(PBKDF2PARAM)
IMPLEMENT_ASN1_FUNCTIONS(PBKDF2PARAM)
/*
* Return an algorithm identifier for a PKCS#5 v2.0 PBE algorithm: yes I know
* this is horrible! Extended version to allow application supplied PRF NID
* and IV.
*/
X509_ALGOR *PKCS5_pbe2_set_iv(const EVP_CIPHER *cipher, int iter,
unsigned char *salt, int saltlen,
unsigned char *aiv, int prf_nid)
{
X509_ALGOR *scheme = NULL, *ret = NULL;
int alg_nid, keylen;
EVP_CIPHER_CTX *ctx = NULL;
unsigned char iv[EVP_MAX_IV_LENGTH];
PBE2PARAM *pbe2 = NULL;
alg_nid = EVP_CIPHER_type(cipher);
if (alg_nid == NID_undef) {
ASN1err(ASN1_F_PKCS5_PBE2_SET_IV,
ASN1_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
goto err;
}
if ((pbe2 = PBE2PARAM_new()) == NULL)
goto merr;
/* Setup the AlgorithmIdentifier for the encryption scheme */
scheme = pbe2->encryption;
scheme->algorithm = OBJ_nid2obj(alg_nid);
if ((scheme->parameter = ASN1_TYPE_new()) == NULL)
goto merr;
/* Create random IV */
if (EVP_CIPHER_iv_length(cipher)) {
if (aiv)
memcpy(iv, aiv, EVP_CIPHER_iv_length(cipher));
else if (RAND_bytes(iv, EVP_CIPHER_iv_length(cipher)) <= 0)
goto err;
}
ctx = EVP_CIPHER_CTX_new();
if (ctx == NULL)
goto merr;
/* Dummy cipherinit to just setup the IV, and PRF */
if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, iv, 0))
goto err;
if (EVP_CIPHER_param_to_asn1(ctx, scheme->parameter) <= 0) {
ASN1err(ASN1_F_PKCS5_PBE2_SET_IV, ASN1_R_ERROR_SETTING_CIPHER_PARAMS);
goto err;
}
/*
* If prf NID unspecified see if cipher has a preference. An error is OK
* here: just means use default PRF.
*/
if ((prf_nid == -1) &&
EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_PBE_PRF_NID, 0, &prf_nid) <= 0) {
ERR_clear_error();
prf_nid = NID_hmacWithSHA256;
}
EVP_CIPHER_CTX_free(ctx);
ctx = NULL;
/* If its RC2 then we'd better setup the key length */
if (alg_nid == NID_rc2_cbc)
keylen = EVP_CIPHER_key_length(cipher);
else
keylen = -1;
/* Setup keyfunc */
X509_ALGOR_free(pbe2->keyfunc);
pbe2->keyfunc = PKCS5_pbkdf2_set(iter, salt, saltlen, prf_nid, keylen);
if (pbe2->keyfunc == NULL)
goto merr;
/* Now set up top level AlgorithmIdentifier */
if ((ret = X509_ALGOR_new()) == NULL)
goto merr;
ret->algorithm = OBJ_nid2obj(NID_pbes2);
/* Encode PBE2PARAM into parameter */
if (!ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(PBE2PARAM), pbe2,
&ret->parameter))
goto merr;
PBE2PARAM_free(pbe2);
pbe2 = NULL;
return ret;
merr:
ASN1err(ASN1_F_PKCS5_PBE2_SET_IV, ERR_R_MALLOC_FAILURE);
err:
EVP_CIPHER_CTX_free(ctx);
PBE2PARAM_free(pbe2);
/* Note 'scheme' is freed as part of pbe2 */
X509_ALGOR_free(ret);
return NULL;
}
X509_ALGOR *PKCS5_pbe2_set(const EVP_CIPHER *cipher, int iter,
unsigned char *salt, int saltlen)
{
return PKCS5_pbe2_set_iv(cipher, iter, salt, saltlen, NULL, -1);
}
X509_ALGOR *PKCS5_pbkdf2_set(int iter, unsigned char *salt, int saltlen,
int prf_nid, int keylen)
{
X509_ALGOR *keyfunc = NULL;
PBKDF2PARAM *kdf = NULL;
ASN1_OCTET_STRING *osalt = NULL;
if ((kdf = PBKDF2PARAM_new()) == NULL)
goto merr;
if ((osalt = ASN1_OCTET_STRING_new()) == NULL)
goto merr;
kdf->salt->value.octet_string = osalt;
kdf->salt->type = V_ASN1_OCTET_STRING;
if (saltlen == 0)
saltlen = PKCS5_SALT_LEN;
if ((osalt->data = OPENSSL_malloc(saltlen)) == NULL)
goto merr;
osalt->length = saltlen;
if (salt)
memcpy(osalt->data, salt, saltlen);
else if (RAND_bytes(osalt->data, saltlen) <= 0)
goto merr;
if (iter <= 0)
iter = PKCS5_DEFAULT_ITER;
if (!ASN1_INTEGER_set(kdf->iter, iter))
goto merr;
/* If have a key len set it up */
if (keylen > 0) {
if ((kdf->keylength = ASN1_INTEGER_new()) == NULL)
goto merr;
if (!ASN1_INTEGER_set(kdf->keylength, keylen))
goto merr;
}
/* prf can stay NULL if we are using hmacWithSHA1 */
if (prf_nid > 0 && prf_nid != NID_hmacWithSHA1) {
kdf->prf = X509_ALGOR_new();
if (kdf->prf == NULL)
goto merr;
X509_ALGOR_set0(kdf->prf, OBJ_nid2obj(prf_nid), V_ASN1_NULL, NULL);
}
/* Finally setup the keyfunc structure */
keyfunc = X509_ALGOR_new();
if (keyfunc == NULL)
goto merr;
keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2);
/* Encode PBKDF2PARAM into parameter of pbe2 */
if (!ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(PBKDF2PARAM), kdf,
&keyfunc->parameter))
goto merr;
PBKDF2PARAM_free(kdf);
return keyfunc;
merr:
ASN1err(ASN1_F_PKCS5_PBKDF2_SET, ERR_R_MALLOC_FAILURE);
PBKDF2PARAM_free(kdf);
X509_ALGOR_free(keyfunc);
return NULL;
}
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