EVP_PKEY_CTX_set1_scrypt_salt, EVP_PKEY_CTX_set_scrypt_N,
EVP_PKEY_CTX_set_scrypt_r, EVP_PKEY_CTX_set_scrypt_p,
EVP_PKEY_CTX_set_scrypt_maxmem_bytes - EVP_PKEY scrypt KDF support functions
#include <openssl/kdf.h>
int EVP_PKEY_CTX_set1_scrypt_salt(EVP_PKEY_CTX *pctx, unsigned char *salt,
int saltlen);
int EVP_PKEY_CTX_set_scrypt_N(EVP_PKEY_CTX *pctx, uint64_t N);
int EVP_PKEY_CTX_set_scrypt_r(EVP_PKEY_CTX *pctx, uint64_t r);
int EVP_PKEY_CTX_set_scrypt_p(EVP_PKEY_CTX *pctx, uint64_t p);
int EVP_PKEY_CTX_set_scrypt_maxmem_bytes(EVP_PKEY_CTX *pctx,
uint64_t maxmem);
These functions are used to set up the necessary data to use the scrypt KDF. For
more information on scrypt, see
scrypt(7).
EVP_PKEY_CTX_set1_scrypt_salt() sets the
saltlen bytes long salt
value.
EVP_PKEY_CTX_set_scrypt_N(),
EVP_PKEY_CTX_set_scrypt_r() and
EVP_PKEY_CTX_set_scrypt_p() configure the work factors N, r and p.
EVP_PKEY_CTX_set_scrypt_maxmem_bytes() sets how much RAM key derivation
may maximally use, given in bytes. If RAM is exceeded because the load factors
are chosen too high, the key derivation will fail.
scrypt also supports string based control operations via
EVP_PKEY_CTX_ctrl_str(3). Similarly, the
salt can either be
specified using the
type parameter "salt" or in hex encoding
by using the "hexsalt" parameter. The work factors
N,
r and
p as well as
maxmem_bytes can be set by using the
parameters "N", "r", "p" and
"maxmem_bytes", respectively.
The scrypt KDF also uses
EVP_PKEY_CTX_set1_pbe_pass() as well as the
value from the string controls "pass" and "hexpass". See
EVP_PKEY_CTX_set1_pbe_pass(3).
All the functions described here are implemented as macros.
All these functions return 1 for success and 0 or a negative value for failure.
In particular a return value of -2 indicates the operation is not supported by
the public key algorithm.
scrypt(7),
EVP_PKEY_CTX_new(3),
EVP_PKEY_CTX_ctrl_str(3),
EVP_PKEY_derive(3)
Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (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>.