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/*
* Copyright 2015-2020 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 <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/kdf.h>
#include <openssl/core_names.h>
#include "internal/numbers.h"
#ifndef OPENSSL_NO_SCRYPT
/*
* Maximum permitted memory allow this to be overridden with Configuration
* option: e.g. -DSCRYPT_MAX_MEM=0 for maximum possible.
*/
#ifdef SCRYPT_MAX_MEM
# if SCRYPT_MAX_MEM == 0
# undef SCRYPT_MAX_MEM
/*
* Although we could theoretically allocate SIZE_MAX memory that would leave
* no memory available for anything else so set limit as half that.
*/
# define SCRYPT_MAX_MEM (SIZE_MAX/2)
# endif
#else
/* Default memory limit: 32 MB */
# define SCRYPT_MAX_MEM (1024 * 1024 * 32)
#endif
int EVP_PBE_scrypt(const char *pass, size_t passlen,
const unsigned char *salt, size_t saltlen,
uint64_t N, uint64_t r, uint64_t p, uint64_t maxmem,
unsigned char *key, size_t keylen)
{
const char *empty = "";
int rv = 1;
EVP_KDF *kdf;
EVP_KDF_CTX *kctx;
OSSL_PARAM params[7], *z = params;
if (r > UINT32_MAX || p > UINT32_MAX) {
ERR_raise(ERR_LIB_EVP, EVP_R_PARAMETER_TOO_LARGE);
return 0;
}
/* Maintain existing behaviour. */
if (pass == NULL) {
pass = empty;
passlen = 0;
}
if (salt == NULL) {
salt = (const unsigned char *)empty;
saltlen = 0;
}
if (maxmem == 0)
maxmem = SCRYPT_MAX_MEM;
/* Use OSSL_LIB_CTX_set0_default() if you need a library context */
kdf = EVP_KDF_fetch(NULL, OSSL_KDF_NAME_SCRYPT, NULL);
kctx = EVP_KDF_CTX_new(kdf);
EVP_KDF_free(kdf);
if (kctx == NULL)
return 0;
*z++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PASSWORD,
(unsigned char *)pass,
passlen);
*z++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT,
(unsigned char *)salt, saltlen);
*z++ = OSSL_PARAM_construct_uint64(OSSL_KDF_PARAM_SCRYPT_N, &N);
*z++ = OSSL_PARAM_construct_uint64(OSSL_KDF_PARAM_SCRYPT_R, &r);
*z++ = OSSL_PARAM_construct_uint64(OSSL_KDF_PARAM_SCRYPT_P, &p);
*z++ = OSSL_PARAM_construct_uint64(OSSL_KDF_PARAM_SCRYPT_MAXMEM, &maxmem);
*z = OSSL_PARAM_construct_end();
if (EVP_KDF_CTX_set_params(kctx, params) != 1
|| EVP_KDF_derive(kctx, key, keylen) != 1)
rv = 0;
EVP_KDF_CTX_free(kctx);
return rv;
}
#endif
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