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Title "PKCS5_PBKDF2_HMAC 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
PKCS5_PBKDF2_HMAC, PKCS5_PBKDF2_HMAC_SHA1 - password based derivation routines with salt and iteration count Header "SYNOPSIS" .Vb 1 #include <openssl/evp.h> \& int PKCS5_PBKDF2_HMAC(const char *pass, int passlen, const unsigned char *salt, int saltlen, int iter, const EVP_MD *digest, int keylen, unsigned char *out); \& int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen, const unsigned char *salt, int saltlen, int iter, int keylen, unsigned char *out); .Ve Header "DESCRIPTION" \s-1PKCS5_PBKDF2_HMAC\s0() derives a key from a password using a salt and iteration count as specified in \s-1RFC 2898.\s0

\fBpass is the password used in the derivation of length passlen. pass is an optional parameter and can be \s-1NULL.\s0 If passlen is -1, then the function will calculate the length of pass using strlen().

\fBsalt is the salt used in the derivation of length saltlen. If the \fBsalt is \s-1NULL,\s0 then saltlen must be 0. The function will not attempt to calculate the length of the salt because it is not assumed to be \s-1NULL\s0 terminated.

\fBiter is the iteration count and its value should be greater than or equal to 1. \s-1RFC 2898\s0 suggests an iteration count of at least 1000. Any \fBiter less than 1 is treated as a single iteration.

\fBdigest is the message digest function used in the derivation. \s-1PKCS5_PBKDF2_HMAC_SHA1\s0() calls \s-1PKCS5_PBKDF2_HMAC\s0() with EVP_sha1().

The derived key will be written to out. The size of the out buffer is specified via keylen.

Header "NOTES" A typical application of this function 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.

These functions make no assumption regarding the given password. It will simply be treated as a byte sequence.

Header "RETURN VALUES" \s-1PKCS5_PBKDF2_HMAC\s0() and \s-1PBKCS5_PBKDF2_HMAC_SHA1\s0() return 1 on success or 0 on error. Header "SEE ALSO" \fBevp\|(7), RAND_bytes\|(3), \fBEVP_BytesToKey\|(3), \fBpassphrase-encoding\|(7) Header "COPYRIGHT" Copyright 2014-2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.