Latest update

2019-02-22 12:53:31 +09:00
parent 6523a76e2e
commit 25fbda8e8b
186 changed files with 9758 additions and 1640 deletions
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+=pod
+
+=head1 NAME
+
+EVP_KDF_PBKDF2 - The PBKDF2 EVP_KDF implementation
+
+=head1 DESCRIPTION
+
+Support for computing the B<PBKDF2> password-based KDF through the B<EVP_KDF>
+API.
+
+The EVP_KDF_PBKDF2 algorithm implements the PBKDF2 password-based key
+derivation function, as described in RFC 2898; it derives a key from a password
+using a salt and iteration count.
+
+=head2 Numeric identity
+
+B<EVP_KDF_PBKDF2> is the numeric identity for this implementation; it
+can be used with the EVP_KDF_CTX_new_id() function.
+
+=head2 Supported controls
+
+The supported controls are:
+
+=over 4
+
+=item B<EVP_KDF_CTRL_SET_PASS>
+
+=item B<EVP_KDF_CTRL_SET_SALT>
+
+=item B<EVP_KDF_CTRL_SET_ITER>
+
+=item B<EVP_KDF_CTRL_SET_MD>
+
+These controls work as described in L<EVP_KDF_CTX(3)/CONTROLS>.
+
+B<iter> is the iteration count and its value should be greater than or equal to
+1. RFC 2898 suggests an iteration count of at least 1000.  The default value is
+2048.  Any B<iter> less than 1 is treated as a single iteration.
+
+=back
+
+=head1 NOTES
+
+A typical application of this algorithm is to derive keying material for an
+encryption algorithm from a password in the B<pass>, a salt in B<salt>,
+and an iteration count.
+
+Increasing the B<iter> 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.
+
+No assumption is made regarding the given password; it is simply treated as a
+byte sequence.
+
+=head1 CONFORMING TO
+
+RFC 2898
+
+=head1 SEE ALSO
+
+L<EVP_KDF_CTX>,
+L<EVP_KDF_CTX_new_id(3)>,
+L<EVP_KDF_CTX_free(3)>,
+L<EVP_KDF_ctrl(3)>,
+L<EVP_KDF_derive(3)>,
+L<EVP_KDF_CTX(3)/CONTROLS>
+
+=head1 COPYRIGHT
+
+Copyright 2018 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