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Edit File : PKCS5_PBKDF2_HMAC_SHA1.3 \| Size : 6.88 KB
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \(-- will .\" give an unbreakable dash, \(PI will give pi, \(L" will give a left .\" double quote, and \(R" will give a right double quote. \(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" PKCS5_PBKDF2_HMAC, PKCS5_PBKDF2_HMAC_SHA1 \- password based derivation routines with salt and iteration count .SH "SYNOPSIS" .IX 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 .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\s-1\fBPKCS5_PBKDF2_HMAC\s0()\fR derives a key from a password using a salt and iteration count as specified in \s-1RFC 2898.\s0 .PP \&\fBpass\fR is the password used in the derivation of length \fBpasslen\fR. \fBpass\fR is an optional parameter and can be \s-1NULL.\s0 If \fBpasslen\fR is \-1, then the function will calculate the length of \fBpass\fR using \fBstrlen()\fR. .PP \&\fBsalt\fR is the salt used in the derivation of length \fBsaltlen\fR. If the \&\fBsalt\fR is \s-1NULL,\s0 then \fBsaltlen\fR must be 0. The function will not attempt to calculate the length of the \fBsalt\fR because it is not assumed to be \s-1NULL\s0 terminated. .PP \&\fBiter\fR 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\fR less than 1 is treated as a single iteration. .PP \&\fBdigest\fR is the message digest function used in the derivation. Values include any of the EVP_* message digests. \s-1\fBPKCS5_PBKDF2_HMAC_SHA1\s0()\fR calls \&\s-1\fBPKCS5_PBKDF2_HMAC\s0()\fR with \fBEVP_sha1()\fR. .PP The derived key will be written to \fBout\fR. The size of the \fBout\fR buffer is specified via \fBkeylen\fR. .SH "NOTES" .IX Header "NOTES" A typical application of this function is to derive keying material for an encryption algorithm from a password in the \fBpass\fR, a salt in \fBsalt\fR, and an iteration count. .PP Increasing the \fBiter\fR 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 These functions make no assumption regarding the given password. It will simply be treated as a byte sequence. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\s-1\fBPKCS5_PBKDF2_HMAC\s0()\fR and \s-1\fBPBKCS5_PBKDF2_HMAC_SHA1\s0()\fR return 1 on success or 0 on error. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBevp\fR\\|(7), \fBRAND_bytes\fR\\|(3), \&\fBEVP_BytesToKey\fR\\|(3), \&\fBpassphrase\-encoding\fR\\|(7) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2014\-2018 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (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>. Back

Edit File : PKCS5_PBKDF2_HMAC_SHA1.3 | Size : 6.88 KB

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.\" ========================================================================
.\"
.IX Title "PKCS5_PBKDF2_HMAC 3"
.TH PKCS5_PBKDF2_HMAC 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
PKCS5_PBKDF2_HMAC, PKCS5_PBKDF2_HMAC_SHA1 \- password based derivation routines with salt and iteration count
.SH "SYNOPSIS"
.IX 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
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\s-1\fBPKCS5_PBKDF2_HMAC\s0()\fR derives a key from a password using a salt and iteration count
as specified in \s-1RFC 2898.\s0
.PP
\&\fBpass\fR is the password used in the derivation of length \fBpasslen\fR. \fBpass\fR
is an optional parameter and can be \s-1NULL.\s0 If \fBpasslen\fR is \-1, then the
function will calculate the length of \fBpass\fR using \fBstrlen()\fR.
.PP
\&\fBsalt\fR is the salt used in the derivation of length \fBsaltlen\fR. If the
\&\fBsalt\fR is \s-1NULL,\s0 then \fBsaltlen\fR must be 0. The function will not
attempt to calculate the length of the \fBsalt\fR because it is not assumed to
be \s-1NULL\s0 terminated.
.PP
\&\fBiter\fR 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\fR less than 1 is treated as a single iteration.
.PP
\&\fBdigest\fR is the message digest function used in the derivation. Values include
any of the EVP_* message digests. \s-1\fBPKCS5_PBKDF2_HMAC_SHA1\s0()\fR calls
\&\s-1\fBPKCS5_PBKDF2_HMAC\s0()\fR with \fBEVP_sha1()\fR.
.PP
The derived key will be written to \fBout\fR. The size of the \fBout\fR buffer
is specified via \fBkeylen\fR.
.SH "NOTES"
.IX Header "NOTES"
A typical application of this function is to derive keying material for an
encryption algorithm from a password in the \fBpass\fR, a salt in \fBsalt\fR,
and an iteration count.
.PP
Increasing the \fBiter\fR 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
These functions make no assumption regarding the given password.
It will simply be treated as a byte sequence.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\s-1\fBPKCS5_PBKDF2_HMAC\s0()\fR and \s-1\fBPBKCS5_PBKDF2_HMAC_SHA1\s0()\fR return 1 on success or 0 on error.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBevp\fR\|(7), \fBRAND_bytes\fR\|(3),
\&\fBEVP_BytesToKey\fR\|(3),
\&\fBpassphrase\-encoding\fR\|(7)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2014\-2018 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (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>.

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