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======================================================================== Title "EVP_KDF-PBKDF2 7" EVP_KDF-PBKDF2 7 2024-06-04 3.0.14 OpenSSL
For nroff, turn off justification. Always turn off hyphenation; it makes way too many mistakes in technical documents. NAME
EVP_KDF-PBKDF2 - The PBKDF2 EVP_KDF implementation
DESCRIPTION
Header "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
Subsection "Identity" "PBKDF2" is the name for this implementation; it
can be used with the
EVP_KDF_fetch() function.
"Supported parameters"
Subsection "Supported parameters" The supported parameters are:
"""pass"" (OSSL_KDF_PARAM_PASSWORD) <octet string>" 4
Item """pass"" (OSSL_KDF_PARAM_PASSWORD) <octet string>" 0
"""salt"" (OSSL_KDF_PARAM_SALT) <octet string>" 4
Item """salt"" (OSSL_KDF_PARAM_SALT) <octet string>" """iter"" (OSSL_KDF_PARAM_ITER) <unsigned integer>" 4
Item """iter"" (OSSL_KDF_PARAM_ITER) <unsigned integer>"
This parameter has a default value of 2048.
"""properties"" (OSSL_KDF_PARAM_PROPERTIES) <UTF8 string>" 4
Item """properties"" (OSSL_KDF_PARAM_PROPERTIES) <UTF8 string>" 0
"""digest"" (OSSL_KDF_PARAM_DIGEST) <UTF8 string>" 4
Item """digest"" (OSSL_KDF_PARAM_DIGEST) <UTF8 string>"
These parameters work as described in "PARAMETERS" in EVP_KDF\|(3).
"""pkcs5"" (OSSL_KDF_PARAM_PKCS5) <integer>" 4
Item """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.
.Sp
The checks performed are:
"- the iteration count is at least 1000." 4
Item "- the iteration count is at least 1000." 0
"- the salt length is at least 128 bits." 4
Item "- the salt length is at least 128 bits." "- the derived key length is at least 112 bits." 4
Item "- the derived key length is at least 112 bits."
.Sp
The default provider uses a default mode of 1 for backwards compatibility,
and the FIPS provider uses a default mode of 0.
.Sp
The value string is expected to be a decimal number 0 or 1.
NOTES
Header "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"
Header "CONFORMING TO" SP800-132
"SEE ALSO"
Header "SEE ALSO" \fBEVP_KDF\|(3),
\fBEVP_KDF_CTX_new\|(3),
\fBEVP_KDF_CTX_free\|(3),
\fBEVP_KDF_CTX_set_params\|(3),
\fBEVP_KDF_derive\|(3),
"PARAMETERS" in
EVP_KDF\|(3)
HISTORY
Header "HISTORY" This functionality was added in OpenSSL 3.0.
COPYRIGHT
Header "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>.