87 lines
2.5 KiB
Text
87 lines
2.5 KiB
Text
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=pod
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=head1 NAME
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EVP_PKEY_CTX_set1_scrypt_salt,
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EVP_PKEY_CTX_set_scrypt_N,
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EVP_PKEY_CTX_set_scrypt_r,
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EVP_PKEY_CTX_set_scrypt_p,
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EVP_PKEY_CTX_set_scrypt_maxmem_bytes
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- EVP_PKEY scrypt KDF support functions
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=head1 SYNOPSIS
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#include <openssl/kdf.h>
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int EVP_PKEY_CTX_set1_scrypt_salt(EVP_PKEY_CTX *pctx, unsigned char *salt,
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int saltlen);
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int EVP_PKEY_CTX_set_scrypt_N(EVP_PKEY_CTX *pctx, uint64_t N);
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int EVP_PKEY_CTX_set_scrypt_r(EVP_PKEY_CTX *pctx, uint64_t r);
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int EVP_PKEY_CTX_set_scrypt_p(EVP_PKEY_CTX *pctx, uint64_t p);
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int EVP_PKEY_CTX_set_scrypt_maxmem_bytes(EVP_PKEY_CTX *pctx,
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uint64_t maxmem);
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=head1 DESCRIPTION
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These functions are used to set up the necessary data to use the
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scrypt KDF.
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For more information on scrypt, see L<scrypt(7)>.
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EVP_PKEY_CTX_set1_scrypt_salt() sets the B<saltlen> bytes long salt
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value.
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EVP_PKEY_CTX_set_scrypt_N(), EVP_PKEY_CTX_set_scrypt_r() and
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EVP_PKEY_CTX_set_scrypt_p() configure the work factors N, r and p.
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EVP_PKEY_CTX_set_scrypt_maxmem_bytes() sets how much RAM key
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derivation may maximally use, given in bytes.
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If RAM is exceeded because the load factors are chosen too high, the
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key derivation will fail.
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=head1 STRING CTRLS
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scrypt also supports string based control operations via
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L<EVP_PKEY_CTX_ctrl_str(3)>.
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Similarly, the B<salt> can either be specified using the B<type>
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parameter "salt" or in hex encoding by using the "hexsalt" parameter.
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The work factors B<N>, B<r> and B<p> as well as B<maxmem_bytes> can be
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set by using the parameters "N", "r", "p" and "maxmem_bytes",
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respectively.
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=head1 NOTES
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The scrypt KDF also uses EVP_PKEY_CTX_set1_pbe_pass() as well as
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the value from the string controls "pass" and "hexpass".
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See L<EVP_PKEY_CTX_set1_pbe_pass(3)>.
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All the functions described here are implemented as macros.
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=head1 RETURN VALUES
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All these functions return 1 for success and 0 or a negative value for
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failure.
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In particular a return value of -2 indicates the operation is not
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supported by the public key algorithm.
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=head1 SEE ALSO
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L<scrypt(7)>,
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L<EVP_PKEY_CTX_new(3)>,
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L<EVP_PKEY_CTX_ctrl_str(3)>,
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L<EVP_PKEY_derive(3)>
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=head1 COPYRIGHT
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Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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