2 * Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
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
10 #include <openssl/evp.h>
11 #include <openssl/err.h>
12 #include <openssl/kdf.h>
13 #include <openssl/core_names.h>
14 #include "internal/numbers.h"
16 #ifndef OPENSSL_NO_SCRYPT
19 * Maximum permitted memory allow this to be overridden with Configuration
20 * option: e.g. -DSCRYPT_MAX_MEM=0 for maximum possible.
24 # if SCRYPT_MAX_MEM == 0
25 # undef SCRYPT_MAX_MEM
27 * Although we could theoretically allocate SIZE_MAX memory that would leave
28 * no memory available for anything else so set limit as half that.
30 # define SCRYPT_MAX_MEM (SIZE_MAX/2)
33 /* Default memory limit: 32 MB */
34 # define SCRYPT_MAX_MEM (1024 * 1024 * 32)
37 int EVP_PBE_scrypt(const char *pass
, size_t passlen
,
38 const unsigned char *salt
, size_t saltlen
,
39 uint64_t N
, uint64_t r
, uint64_t p
, uint64_t maxmem
,
40 unsigned char *key
, size_t keylen
)
42 const char *empty
= "";
46 OSSL_PARAM params
[7], *z
= params
;
48 if (r
> UINT32_MAX
|| p
> UINT32_MAX
) {
49 EVPerr(EVP_F_EVP_PBE_SCRYPT
, EVP_R_PARAMETER_TOO_LARGE
);
53 /* Maintain existing behaviour. */
59 salt
= (const unsigned char *)empty
;
63 maxmem
= SCRYPT_MAX_MEM
;
65 kdf
= EVP_KDF_fetch(NULL
, SN_id_scrypt
, NULL
);
66 kctx
= EVP_KDF_CTX_new(kdf
);
71 *z
++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PASSWORD
,
72 (unsigned char *)pass
,
74 *z
++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT
,
75 (unsigned char *)salt
, saltlen
);
76 *z
++ = OSSL_PARAM_construct_uint64(OSSL_KDF_PARAM_SCRYPT_N
, &N
);
77 *z
++ = OSSL_PARAM_construct_uint64(OSSL_KDF_PARAM_SCRYPT_R
, &r
);
78 *z
++ = OSSL_PARAM_construct_uint64(OSSL_KDF_PARAM_SCRYPT_P
, &p
);
79 *z
++ = OSSL_PARAM_construct_uint64(OSSL_KDF_PARAM_SCRYPT_MAXMEM
, &maxmem
);
80 *z
= OSSL_PARAM_construct_end();
81 if (EVP_KDF_CTX_set_params(kctx
, params
) != 1
82 || EVP_KDF_derive(kctx
, key
, keylen
) != 1)
85 EVP_KDF_CTX_free(kctx
);