1EVP_KDF-PBKDF2(7ossl)               OpenSSL              EVP_KDF-PBKDF2(7ossl)
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NAME

6       EVP_KDF-PBKDF2 - The PBKDF2 EVP_KDF implementation
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DESCRIPTION

9       Support for computing the PBKDF2 password-based KDF through the EVP_KDF
10       API.
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12       The EVP_KDF-PBKDF2 algorithm implements the PBKDF2 password-based key
13       derivation function, as described in SP800-132; it derives a key from a
14       password using a salt and iteration count.
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16   Identity
17       "PBKDF2" is the name for this implementation; it can be used with the
18       EVP_KDF_fetch() function.
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20   Supported parameters
21       The supported parameters are:
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23       "pass" (OSSL_KDF_PARAM_PASSWORD) <octet string>
24       "salt" (OSSL_KDF_PARAM_SALT) <octet string>
25       "iter" (OSSL_KDF_PARAM_ITER) <unsigned integer>
26           This parameter has a default value of 2048.
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28       "properties" (OSSL_KDF_PARAM_PROPERTIES) <UTF8 string>
29       "digest" (OSSL_KDF_PARAM_DIGEST) <UTF8 string>
30           These parameters work as described in "PARAMETERS" in EVP_KDF(3).
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32       "pkcs5" (OSSL_KDF_PARAM_PKCS5) <integer>
33           This parameter can be used to enable or disable SP800-132
34           compliance checks.  Setting the mode to 0 enables the compliance
35           checks.
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37           The checks performed are:
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39           - the iteration count is at least 1000.
40           - the salt length is at least 128 bits.
41           - the derived key length is at least 112 bits.
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43           The default provider uses a default mode of 1 for backwards
44           compatibility, and the FIPS provider uses a default mode of 0.
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46           The value string is expected to be a decimal number 0 or 1.
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NOTES

49       A typical application of this algorithm is to derive keying material
50       for an encryption algorithm from a password in the "pass", a salt in
51       "salt", and an iteration count.
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53       Increasing the "iter" parameter slows down the algorithm which makes it
54       harder for an attacker to perform a brute force attack using a large
55       number of candidate passwords.
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57       No assumption is made regarding the given password; it is simply
58       treated as a byte sequence.
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CONFORMING TO

61       SP800-132
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SEE ALSO

64       EVP_KDF(3), EVP_KDF_CTX_new(3), EVP_KDF_CTX_free(3),
65       EVP_KDF_CTX_set_params(3), EVP_KDF_derive(3), "PARAMETERS" in
66       EVP_KDF(3)
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HISTORY

69       This functionality was added to OpenSSL 3.0.
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72       Copyright 2018-2022 The OpenSSL Project Authors. All Rights Reserved.
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74       Licensed under the Apache License 2.0 (the "License").  You may not use
75       this file except in compliance with the License.  You can obtain a copy
76       in the file LICENSE in the source distribution or at
77       <https://www.openssl.org/source/license.html>.
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813.0.5                             2022-11-01             EVP_KDF-PBKDF2(7ossl)
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