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.\"
.IX Title "EVP_KDF-PBKDF1 7ossl"
.TH EVP_KDF-PBKDF1 7ossl "2025-09-30" "3.5.4" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
EVP_KDF\-PBKDF1 \- The PBKDF1 EVP_KDF implementation
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Support for computing the \fB\s-1PBKDF1\s0\fR password-based \s-1KDF\s0 through the \fB\s-1EVP_KDF\s0\fR
\&\s-1API.\s0
.PP
The \s-1EVP_KDF\-PBKDF1\s0 algorithm implements the \s-1PBKDF1\s0 password-based key
derivation function, as described in \s-1RFC 8018\s0; it derives a key from a password
using a salt and iteration count.
.SS "Identity"
.IX Subsection "Identity"
\&\*(L"\s-1PBKDF1\*(R"\s0 is the name for this implementation; it
can be used with the \fBEVP_KDF_fetch()\fR function.
.SS "Supported parameters"
.IX Subsection "Supported parameters"
The supported parameters are:
.ie n .IP """pass"" (\fB\s-1OSSL_KDF_PARAM_PASSWORD\s0\fR) <octet string>" 4
.el .IP "``pass'' (\fB\s-1OSSL_KDF_PARAM_PASSWORD\s0\fR) <octet string>" 4
.IX Item "pass (OSSL_KDF_PARAM_PASSWORD) <octet string>"
.PD 0
.ie n .IP """salt"" (\fB\s-1OSSL_KDF_PARAM_SALT\s0\fR) <octet string>" 4
.el .IP "``salt'' (\fB\s-1OSSL_KDF_PARAM_SALT\s0\fR) <octet string>" 4
.IX Item "salt (OSSL_KDF_PARAM_SALT) <octet string>"
.ie n .IP """iter"" (\fB\s-1OSSL_KDF_PARAM_ITER\s0\fR) <unsigned integer>" 4
.el .IP "``iter'' (\fB\s-1OSSL_KDF_PARAM_ITER\s0\fR) <unsigned integer>" 4
.IX Item "iter (OSSL_KDF_PARAM_ITER) <unsigned integer>"
.PD
This parameter has a default value of 0 and should be set.
.ie n .IP """properties"" (\fB\s-1OSSL_KDF_PARAM_PROPERTIES\s0\fR) <\s-1UTF8\s0 string>" 4
.el .IP "``properties'' (\fB\s-1OSSL_KDF_PARAM_PROPERTIES\s0\fR) <\s-1UTF8\s0 string>" 4
.IX Item "properties (OSSL_KDF_PARAM_PROPERTIES) <UTF8 string>"
.PD 0
.ie n .IP """digest"" (\fB\s-1OSSL_KDF_PARAM_DIGEST\s0\fR) <\s-1UTF8\s0 string>" 4
.el .IP "``digest'' (\fB\s-1OSSL_KDF_PARAM_DIGEST\s0\fR) <\s-1UTF8\s0 string>" 4
.IX Item "digest (OSSL_KDF_PARAM_DIGEST) <UTF8 string>"
.PD
These parameters work as described in \*(L"\s-1PARAMETERS\*(R"\s0 in \s-1\fBEVP_KDF\s0\fR\|(3).
.SH "NOTES"
.IX Header "NOTES"
A typical application of this algorithm is to derive keying material for an
encryption algorithm from a password in the \*(L"pass\*(R", a salt in \*(L"salt\*(R",
and an iteration count.
.PP
Increasing the \*(L"iter\*(R" parameter slows down the algorithm which makes it
harder for an attacker to perform a brute force attack using a large number
of candidate passwords.
.PP
No assumption is made regarding the given password; it is simply treated as a
byte sequence.
.PP
The legacy provider needs to be available in order to access this algorithm.
.SH "CONFORMING TO"
.IX Header "CONFORMING TO"
\&\s-1RFC 8018\s0
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\s-1\fBEVP_KDF\s0\fR\|(3),
\&\fBEVP_KDF_CTX_new\fR\|(3),
\&\fBEVP_KDF_CTX_free\fR\|(3),
\&\fBEVP_KDF_CTX_set_params\fR\|(3),
\&\fBEVP_KDF_derive\fR\|(3),
\&\*(L"\s-1PARAMETERS\*(R"\s0 in \s-1\fBEVP_KDF\s0\fR\|(3),
\&\fBOSSL_PROVIDER\-legacy\fR\|(7)
.SH "HISTORY"
.IX Header "HISTORY"
This functionality was added in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (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>.
