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-.\" $OpenBSD: EVP_BytesToKey.3,v 1.9 2024/12/05 15:12:37 schwarze Exp $
-.\" full merge up to: OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
-.\"
-.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
-.\" Copyright (c) 2001, 2011, 2013, 2014, 2015 The OpenSSL Project.
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\"
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\"
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in
-.\"    the documentation and/or other materials provided with the
-.\"    distribution.
-.\"
-.\" 3. All advertising materials mentioning features or use of this
-.\"    software must display the following acknowledgment:
-.\"    "This product includes software developed by the OpenSSL Project
-.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
-.\"
-.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
-.\"    endorse or promote products derived from this software without
-.\"    prior written permission. For written permission, please contact
-.\"    openssl-core@openssl.org.
-.\"
-.\" 5. Products derived from this software may not be called "OpenSSL"
-.\"    nor may "OpenSSL" appear in their names without prior written
-.\"    permission of the OpenSSL Project.
-.\"
-.\" 6. Redistributions of any form whatsoever must retain the following
-.\"    acknowledgment:
-.\"    "This product includes software developed by the OpenSSL Project
-.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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-.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
-.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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-.Dd $Mdocdate: December 5 2024 $
-.Dt EVP_BYTESTOKEY 3
-.Os
-.Sh NAME
-.Nm EVP_BytesToKey
-.Nd password based encryption routine
-.Sh SYNOPSIS
-.In openssl/evp.h
-.Ft int
-.Fo EVP_BytesToKey
-.Fa "const EVP_CIPHER *type"
-.Fa "const EVP_MD *md"
-.Fa "const unsigned char *salt"
-.Fa "const unsigned char *data"
-.Fa "int datal"
-.Fa "int count"
-.Fa "unsigned char *key"
-.Fa "unsigned char *iv"
-.Fc
-.Sh DESCRIPTION
-.Fn EVP_BytesToKey
-derives a key and IV from various parameters.
-.Fa type
-is the cipher to derive the key and IV for.
-.Fa md
-is the message digest to use.
-The
-.Fa salt
-parameter is used as a salt in the derivation:
-it should point to a buffer containing
-.Dv PKCS5_SALT_LEN No = 8
-bytes or
-.Dv NULL
-if no salt is used.
-.Fa data
-is a buffer containing
-.Fa datal
-bytes which is used to derive the keying data.
-.Fa count
-is the iteration count to use.
-The derived key and IV will be written to
-.Fa key
-and
-.Fa iv ,
-respectively.
-.Pp
-A typical application of this function is to derive keying material for
-an encryption algorithm from a password in the
-.Fa data
-parameter.
-.Pp
-Increasing the
-.Fa count
-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.
-.Pp
-If the total key and IV length is less than the digest length and MD5
-is used, then the derivation algorithm is compatible with PKCS#5 v1.5.
-Otherwise, a non-standard extension is used to derive the extra data.
-.Pp
-Newer applications should use more standard algorithms such as PBKDF2 as
-defined in PKCS#5v2.1 for key derivation.
-.Sh KEY DERIVATION ALGORITHM
-The key and IV is derived by concatenating D_1, D_2, etc. until enough
-data is available for the key and IV.
-D_i is defined recursively as:
-.Pp
-.Dl D_i = HASH^count(D_(i-1) || data || salt)
-.Pp
-where || denotes concatenation, D_0 is empty, HASH is the digest
-algorithm in use, HASH^1(data) is simply HASH(data), HASH^2(data) is
-HASH(HASH(data)) and so on.
-.Pp
-The initial bytes are used for the key and the subsequent bytes for the
-IV.
-.Sh RETURN VALUES
-If
-.Fa data
-is
-.Dv NULL ,
-.Fn EVP_BytesToKey
-returns the number of bytes needed to store the derived key.
-Otherwise,
-.Fn EVP_BytesToKey
-returns the size of the derived key in bytes or 0 on error.
-.Sh SEE ALSO
-.Xr evp 3 ,
-.Xr EVP_EncryptInit 3 ,
-.Xr PKCS5_PBKDF2_HMAC 3
-.Sh HISTORY
-.Fn EVP_BytesToKey
-first appeared in SSLeay 0.5.1 and has been available since
-.Ox 2.4 .