EVP_KDF-PKCS12KDF(7ssl) - man - phpman

Che Dong
EVP_KDF-PKCS12KDF(7SSL)                        OpenSSL                       EVP_KDF-PKCS12KDF(7SSL)



NAME
       EVP_KDF-PKCS12KDF - The PKCS#12 EVP_KDF implementation

DESCRIPTION
       Support for computing the PKCS#12 password-based KDF through the EVP_KDF API.

       The EVP_KDF-PKCS12KDF algorithm implements the PKCS#12 password-based key derivation
       function, as described in appendix B of RFC 7292 (PKCS #12: Personal Information Exchange
       Syntax); it derives a key from a password using a salt, iteration count and the intended
       usage.

   Identity
       "PKCS12KDF" is the name for this implementation; it can be used with the EVP_KDF_fetch()
       function.

   Supported parameters
       The supported parameters are:

       "pass" (OSSL_KDF_PARAM_PASSWORD) <octet string>
       "salt" (OSSL_KDF_PARAM_SALT) <octet string>
       "iter" (OSSL_KDF_PARAM_ITER) <unsigned integer>
       "properties" (OSSL_KDF_PARAM_PROPERTIES) <UTF8 string>
       "digest" (OSSL_KDF_PARAM_DIGEST) <UTF8 string>
           These parameters work as described in "PARAMETERS" in EVP_KDF(3).

       "id" (OSSL_KDF_PARAM_PKCS12_ID) <integer>
           This parameter is used to specify the intended usage of the output bits, as per RFC 7292
           section B.3.

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

       Increasing the "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.

CONFORMING TO
       RFC7292

SEE ALSO
       EVP_KDF(3), EVP_KDF_CTX_new(3), EVP_KDF_CTX_free(3), EVP_KDF_CTX_set_params(3),
       EVP_KDF_derive(3), "PARAMETERS" in EVP_KDF(3)

HISTORY
       This functionality was added to OpenSSL 3.0.

COPYRIGHT
       Copyright 2020 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 <https://www.openssl.org/source/license.html>.



3.0.2                                        2026-04-07                      EVP_KDF-PKCS12KDF(7SSL)