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 "internal/numbers.h"
15 #ifndef OPENSSL_NO_SCRYPT
18 * Maximum permitted memory allow this to be overridden with Configuration
19 * option: e.g. -DSCRYPT_MAX_MEM=0 for maximum possible.
23 # if SCRYPT_MAX_MEM == 0
24 # undef SCRYPT_MAX_MEM
26 * Although we could theoretically allocate SIZE_MAX memory that would leave
27 * no memory available for anything else so set limit as half that.
29 # define SCRYPT_MAX_MEM (SIZE_MAX/2)
32 /* Default memory limit: 32 MB */
33 # define SCRYPT_MAX_MEM (1024 * 1024 * 32)
36 int EVP_PBE_scrypt(const char *pass, size_t passlen,
37 const unsigned char *salt, size_t saltlen,
38 uint64_t N, uint64_t r, uint64_t p, uint64_t maxmem,
39 unsigned char *key, size_t keylen)
41 const char *empty = "";
45 if (r > UINT32_MAX || p > UINT32_MAX) {
46 EVPerr(EVP_F_EVP_PBE_SCRYPT, EVP_R_PARAMETER_TOO_LARGE);
50 /* Maintain existing behaviour. */
56 maxmem = SCRYPT_MAX_MEM;
58 kctx = EVP_KDF_CTX_new_id(EVP_KDF_SCRYPT);
62 if (EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_PASS, pass, (size_t)passlen) != 1
63 || EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_SALT,
64 salt, (size_t)saltlen) != 1
65 || EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_SCRYPT_N, N) != 1
66 || EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_SCRYPT_R, (uint32_t)r) != 1
67 || EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_SCRYPT_P, (uint32_t)p) != 1
68 || EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_MAXMEM_BYTES, maxmem) != 1
69 || EVP_KDF_derive(kctx, key, keylen) != 1)
72 EVP_KDF_CTX_free(kctx);