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.\"
.IX Title "EVP_KDF-PKCS12KDF 7ossl"
.TH EVP_KDF-PKCS12KDF 7ossl "2023-09-19" "3.0.11" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
EVP_KDF\-PKCS12KDF \- The PKCS#12 EVP_KDF implementation
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Support for computing the \fBPKCS#12\fR password-based \s-1KDF\s0 through the \fB\s-1EVP_KDF\s0\fR
\&\s-1API.\s0
.PP
The \s-1EVP_KDF\-PKCS12KDF\s0 algorithm implements the PKCS#12 password-based key
derivation function, as described in appendix B of \s-1RFC 7292\s0 (\s-1PKCS\s0 #12:
Personal Information Exchange Syntax); it derives a key from a password
using a salt, iteration count and the intended usage.
.SS "Identity"
.IX Subsection "Identity"
\&\*(L"\s-1PKCS12KDF\*(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>"
.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>"
.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).
.ie n .IP """id"" (\fB\s-1OSSL_KDF_PARAM_PKCS12_ID\s0\fR) <integer>" 4
.el .IP "``id'' (\fB\s-1OSSL_KDF_PARAM_PKCS12_ID\s0\fR) <integer>" 4
.IX Item "id (OSSL_KDF_PARAM_PKCS12_ID) <integer>"
This parameter is used to specify the intended usage of the output bits, as per
\&\s-1RFC 7292\s0 section B.3.
.SH "NOTES"
.IX Header "NOTES"
This algorithm is not available in the \s-1FIPS\s0 provider as it is not \s-1FIPS\s0
approvable.
.PP
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.
.SH "CONFORMING TO"
.IX Header "CONFORMING TO"
\&\s-1RFC7292\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),
\&\s-1\fBOSSL_PROVIDER\-FIPS\s0\fR\|(7)
.SH "HISTORY"
.IX Header "HISTORY"
This functionality was added in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2020\-2023 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>.