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EVP_PKEY_CTX_set_scrypt_N.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" 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 .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #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); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" These functions are used to set up the necessary data to use the scrypt \s-1KDF.\s0 For more information on scrypt, see \fBscrypt\fR\|(7). .PP \&\fBEVP_PKEY_CTX_set1_scrypt_salt()\fR sets the \fBsaltlen\fR bytes long salt value. .PP \&\fBEVP_PKEY_CTX_set_scrypt_N()\fR, \fBEVP_PKEY_CTX_set_scrypt_r()\fR and \&\fBEVP_PKEY_CTX_set_scrypt_p()\fR configure the work factors N, r and p. .PP \&\fBEVP_PKEY_CTX_set_scrypt_maxmem_bytes()\fR sets how much \s-1RAM\s0 key derivation may maximally use, given in bytes. If \s-1RAM\s0 is exceeded because the load factors are chosen too high, the key derivation will fail. .SH "STRING CTRLS" .IX Header "STRING CTRLS" scrypt also supports string based control operations via \&\fBEVP_PKEY_CTX_ctrl_str\fR\|(3). Similarly, the \fBsalt\fR can either be specified using the \fBtype\fR parameter \*(L"salt\*(R" or in hex encoding by using the \*(L"hexsalt\*(R" parameter. The work factors \fBN\fR, \fBr\fR and \fBp\fR as well as \fBmaxmem_bytes\fR can be set by using the parameters \*(L"N\*(R", \*(L"r\*(R", \*(L"p\*(R" and \*(L"maxmem_bytes\*(R", respectively. .SH "NOTES" .IX Header "NOTES" The scrypt \s-1KDF\s0 also uses \fBEVP_PKEY_CTX_set1_pbe_pass()\fR as well as the value from the string controls \*(L"pass\*(R" and \*(L"hexpass\*(R". See \fBEVP_PKEY_CTX_set1_pbe_pass\fR\|(3). .PP All the functions described here are implemented as macros. .SH "RETURN VALUES" .IX Header "RETURN VALUES" 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. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBscrypt\fR\|(7), \&\fBEVP_PKEY_CTX_new\fR\|(3), \&\fBEVP_PKEY_CTX_ctrl_str\fR\|(3), \&\fBEVP_PKEY_derive\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2017\-2018 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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