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

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 to OpenSSL 3.0.

COPYRIGHT
       Copyright 2018-2020 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>.

3.0.0-alpha6			  2020-08-06		     EVP_KDF-PBKDF2(7)

NAME | DESCRIPTION | NOTES | CONFORMING TO | SEE ALSO | HISTORY | COPYRIGHT

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