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.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \(-- will .\" give an unbreakable dash, \(PI will give pi, \(L" will give a left .\" double quote, and \(R" will give a right double quote. \(C+ will .\" give a nicer C++. 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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>.