mirror of https://github.com/openssl/openssl.git
87 lines
2.1 KiB
Plaintext
87 lines
2.1 KiB
Plaintext
=pod
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=head1 NAME
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EVP_KDF-PKCS12KDF - The PKCS#12 EVP_KDF implementation
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=head1 DESCRIPTION
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Support for computing the B<PKCS#12> password-based KDF through the B<EVP_KDF>
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API.
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The EVP_KDF-PKCS12KDF algorithm implements the PKCS#12 password-based key
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derivation function, as described in appendix B of RFC 7292 (PKCS #12:
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Personal Information Exchange Syntax); it derives a key from a password
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using a salt, iteration count and the intended usage.
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=head2 Identity
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"PKCS12KDF" is the name for this implementation; it
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can be used with the EVP_KDF_fetch() function.
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=head2 Supported parameters
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The supported parameters are:
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=over 4
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=item "pass" (B<OSSL_KDF_PARAM_PASSWORD>) <octet string>
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=item "salt" (B<OSSL_KDF_PARAM_SALT>) <octet string>
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=item "iter" (B<OSSL_KDF_PARAM_ITER>) <unsigned integer>
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=item "properties" (B<OSSL_KDF_PARAM_PROPERTIES>) <UTF8 string>
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=item "digest" (B<OSSL_KDF_PARAM_DIGEST>) <UTF8 string>
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These parameters work as described in L<EVP_KDF(3)/PARAMETERS>.
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=item "id" (B<OSSL_KDF_PARAM_PKCS12_ID>) <integer>
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This parameter is used to specify the intended usage of the output bits, as per
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RFC 7292 section B.3.
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=back
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=head1 NOTES
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A typical application of this algorithm is to derive keying material for an
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encryption algorithm from a password in the "pass", a salt in "salt",
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and an iteration count.
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Increasing the "iter" parameter slows down the algorithm which makes it
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harder for an attacker to perform a brute force attack using a large number
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of candidate passwords.
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No assumption is made regarding the given password; it is simply treated as a
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byte sequence.
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=head1 CONFORMING TO
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RFC7292
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=head1 SEE ALSO
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L<EVP_KDF(3)>,
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L<EVP_KDF_CTX_new(3)>,
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L<EVP_KDF_CTX_free(3)>,
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L<EVP_KDF_CTX_set_params(3)>,
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L<EVP_KDF_derive(3)>,
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L<EVP_KDF(3)/PARAMETERS>
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=head1 HISTORY
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This functionality was added to OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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