man > EVP_KDF-PBKDF2(7)

EVP_KDF-PBKDF2(7SSL)                           OpenSSL                          EVP_KDF-PBKDF2(7SSL)

NAME
       EVP_KDF-PBKDF2 - The PBKDF2 EVP_KDF implementation

DESCRIPTION
       Support for computing the PBKDF2 password-based KDF through the EVP_KDF API.

       The EVP_KDF-PBKDF2 algorithm implements the PBKDF2 password-based key derivation function, as
       described in SP800-132; it derives a key from a password using a salt and iteration count.

   Identity
       "PBKDF2" 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>
           This parameter has a default value of 2048.

       "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).

       "pkcs5" (OSSL_KDF_PARAM_PKCS5) <integer>
           This parameter can be used to enable or disable SP800-132 compliance checks.  Setting the
           mode to 0 enables the compliance checks.

           The checks performed are:

           - the iteration count is at least 1000.
           - the salt length is at least 128 bits.
           - the derived key length is at least 112 bits.

           The  default  provider uses a default mode of 1 for backwards compatibility, and the FIPS
           provider uses a default mode of 0.

           The value string is expected to be a decimal number 0 or 1.

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
       SP800-132

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 in OpenSSL 3.0.

COPYRIGHT
       Copyright 2018-2022 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>.

3.0.13                                       2026-07-29                         EVP_KDF-PBKDF2(7SSL)