=pod

=head1 NAME

EVP_KDF-PVKKDF - The PVK EVP_KDF implementation

=head1 DESCRIPTION

Support for computing the B<PVK KDF> PIN-based KDF through the B<EVP_KDF>
API.

The EVP_KDF-PVKKDF algorithm implements a PVK PIN-based key
derivation function; it derives a key from a password using a salt.

=head2 Identity

"PVKKDF" is the name for this implementation; it
can be used with the EVP_KDF_fetch() function.

=head2 Supported parameters

The supported parameters are:

=over 4

=item "pass" (B<OSSL_KDF_PARAM_PASSWORD>) <octet string>

=item "salt" (B<OSSL_KDF_PARAM_SALT>) <octet string>

=item "properties" (B<OSSL_KDF_PARAM_PROPERTIES>) <UTF8 string>

=item "digest" (B<OSSL_KDF_PARAM_DIGEST>) <UTF8 string>

These parameters work as described in L<EVP_KDF(3)/PARAMETERS>.

=back

=head1 NOTES

A typical application of this algorithm is to derive keying material for an
encryption algorithm from a password in the "pass" and a salt in "salt".

No assumption is made regarding the given password; it is simply treated as a
byte sequence.

The legacy provider needs to be available in order to access this algorithm.

=head1 SEE ALSO

L<EVP_KDF(3)>,
L<EVP_KDF_CTX_new(3)>,
L<EVP_KDF_CTX_free(3)>,
L<EVP_KDF_CTX_set_params(3)>,
L<EVP_KDF_derive(3)>,
L<EVP_KDF(3)/PARAMETERS>,
L<OSSL_PROVIDER-legacy(7)>

=head1 HISTORY

This functionality was added to OpenSSL 3.0.

=head1 COPYRIGHT

Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the "License").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.

=cut