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Diffstat (limited to 'secure/lib/libcrypto/man/man7/EVP_KDF-HKDF.7')
| -rw-r--r-- | secure/lib/libcrypto/man/man7/EVP_KDF-HKDF.7 | 211 |
1 files changed, 72 insertions, 139 deletions
diff --git a/secure/lib/libcrypto/man/man7/EVP_KDF-HKDF.7 b/secure/lib/libcrypto/man/man7/EVP_KDF-HKDF.7 index da992a187d1a..aab786491abf 100644 --- a/secure/lib/libcrypto/man/man7/EVP_KDF-HKDF.7 +++ b/secure/lib/libcrypto/man/man7/EVP_KDF-HKDF.7 @@ -1,4 +1,5 @@ -.\" Automatically generated by Pod::Man 4.14 (Pod::Simple 3.42) +.\" -*- mode: troff; coding: utf-8 -*- +.\" Automatically generated by Pod::Man 5.0102 (Pod::Simple 3.45) .\" .\" Standard preamble: .\" ======================================================================== @@ -15,29 +16,12 @@ .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++. Capital omega is used to do unbreakable dashes and -.\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff, -.\" nothing in troff, for use with C<>. -.tr \(*W- -.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' +.\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>. .ie n \{\ -. ds -- \(*W- -. ds PI pi -. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch -. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch -. ds L" "" -. ds R" "" . ds C` "" . ds C' "" 'br\} .el\{\ -. ds -- \|\(em\| -. ds PI \(*p -. ds L" `` -. ds R" '' . ds C` . ds C' 'br\} @@ -68,133 +52,67 @@ . \} .\} .rr rF -.\" Fear. Run. Save yourself. No user-serviceable parts. -. \" fudge factors for nroff and troff -.if n \{\ -. ds #H 0 -. ds #V .8m -. ds #F .3m -. ds #[ \f1 -. ds #] \fP -.\} -.if t \{\ -. ds #H ((1u-(\\\\n(.fu%2u))*.13m) -. ds #V .6m -. ds #F 0 -. ds #[ \& -. ds #] \& -.\} -. \" simple accents for nroff and troff -.if n \{\ -. ds ' \& -. ds ` \& -. ds ^ \& -. ds , \& -. ds ~ ~ -. ds / -.\} -.if t \{\ -. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" -. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' -. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' -. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' -. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' -. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' -.\} -. \" troff and (daisy-wheel) nroff accents -.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V' -.ds 8 \h'\*(#H'\(*b\h'-\*(#H' -.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#] -.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H' -.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u' -.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#] -.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#] -.ds ae a\h'-(\w'a'u*4/10)'e -.ds Ae A\h'-(\w'A'u*4/10)'E -. \" corrections for vroff -.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u' -.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u' -. \" for low resolution devices (crt and lpr) -.if \n(.H>23 .if \n(.V>19 \ -\{\ -. ds : e -. ds 8 ss -. ds o a -. ds d- d\h'-1'\(ga -. ds D- D\h'-1'\(hy -. ds th \o'bp' -. ds Th \o'LP' -. ds ae ae -. ds Ae AE -.\} -.rm #[ #] #H #V #F C .\" ======================================================================== .\" .IX Title "EVP_KDF-HKDF 7ossl" -.TH EVP_KDF-HKDF 7ossl "2023-09-19" "3.0.11" "OpenSSL" +.TH EVP_KDF-HKDF 7ossl 2025-09-30 3.5.4 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" +.SH NAME EVP_KDF\-HKDF \- The HKDF EVP_KDF implementation -.SH "DESCRIPTION" +.SH DESCRIPTION .IX Header "DESCRIPTION" -Support for computing the \fB\s-1HKDF\s0\fR \s-1KDF\s0 through the \fB\s-1EVP_KDF\s0\fR \s-1API.\s0 +Support for computing the \fBHKDF\fR KDF through the \fBEVP_KDF\fR API. .PP -The \s-1EVP_KDF\-HKDF\s0 algorithm implements the \s-1HKDF\s0 key derivation function. -\&\s-1HKDF\s0 follows the \*(L"extract-then-expand\*(R" paradigm, where the \s-1KDF\s0 logically +The EVP_KDF\-HKDF algorithm implements the HKDF key derivation function. +HKDF follows the "extract-then-expand" paradigm, where the KDF logically consists of two modules. The first stage takes the input keying material -and \*(L"extracts\*(R" from it a fixed-length pseudorandom key K. The second stage -\&\*(L"expands\*(R" the key K into several additional pseudorandom keys (the output -of the \s-1KDF\s0). -.SS "Identity" +and "extracts" from it a fixed-length pseudorandom key K. The second stage +"expands" the key K into several additional pseudorandom keys (the output +of the KDF). +.PP +The output is considered to be keying material. +.SS Identity .IX Subsection "Identity" -\&\*(L"\s-1HKDF\*(R"\s0 is the name for this implementation; it +"HKDF" is the name for this implementation; it can be used with the \fBEVP_KDF_fetch()\fR function. .SS "Supported parameters" .IX Subsection "Supported parameters" The supported parameters are: -.ie n .IP """properties"" (\fB\s-1OSSL_KDF_PARAM_PROPERTIES\s0\fR) <\s-1UTF8\s0 string>" 4 -.el .IP "``properties'' (\fB\s-1OSSL_KDF_PARAM_PROPERTIES\s0\fR) <\s-1UTF8\s0 string>" 4 -.IX Item "properties (OSSL_KDF_PARAM_PROPERTIES) <UTF8 string>" +.IP """properties"" (\fBOSSL_KDF_PARAM_PROPERTIES\fR) <UTF8 string>" 4 +.IX Item """properties"" (OSSL_KDF_PARAM_PROPERTIES) <UTF8 string>" .PD 0 -.ie n .IP """digest"" (\fB\s-1OSSL_KDF_PARAM_DIGEST\s0\fR) <\s-1UTF8\s0 string>" 4 -.el .IP "``digest'' (\fB\s-1OSSL_KDF_PARAM_DIGEST\s0\fR) <\s-1UTF8\s0 string>" 4 -.IX Item "digest (OSSL_KDF_PARAM_DIGEST) <UTF8 string>" -.ie n .IP """key"" (\fB\s-1OSSL_KDF_PARAM_KEY\s0\fR) <octet string>" 4 -.el .IP "``key'' (\fB\s-1OSSL_KDF_PARAM_KEY\s0\fR) <octet string>" 4 -.IX Item "key (OSSL_KDF_PARAM_KEY) <octet string>" -.ie n .IP """salt"" (\fB\s-1OSSL_KDF_PARAM_SALT\s0\fR) <octet string>" 4 -.el .IP "``salt'' (\fB\s-1OSSL_KDF_PARAM_SALT\s0\fR) <octet string>" 4 -.IX Item "salt (OSSL_KDF_PARAM_SALT) <octet string>" +.IP """digest"" (\fBOSSL_KDF_PARAM_DIGEST\fR) <UTF8 string>" 4 +.IX Item """digest"" (OSSL_KDF_PARAM_DIGEST) <UTF8 string>" +.IP """key"" (\fBOSSL_KDF_PARAM_KEY\fR) <octet string>" 4 +.IX Item """key"" (OSSL_KDF_PARAM_KEY) <octet string>" +.IP """salt"" (\fBOSSL_KDF_PARAM_SALT\fR) <octet string>" 4 +.IX Item """salt"" (OSSL_KDF_PARAM_SALT) <octet string>" .PD -These parameters work as described in \*(L"\s-1PARAMETERS\*(R"\s0 in \s-1\fBEVP_KDF\s0\fR\|(3). -.ie n .IP """info"" (\fB\s-1OSSL_KDF_PARAM_INFO\s0\fR) <octet string>" 4 -.el .IP "``info'' (\fB\s-1OSSL_KDF_PARAM_INFO\s0\fR) <octet string>" 4 -.IX Item "info (OSSL_KDF_PARAM_INFO) <octet string>" +These parameters work as described in "PARAMETERS" in \fBEVP_KDF\fR\|(3). +.IP """info"" (\fBOSSL_KDF_PARAM_INFO\fR) <octet string>" 4 +.IX Item """info"" (OSSL_KDF_PARAM_INFO) <octet string>" This parameter sets the info value. The length of the context info buffer cannot exceed 1024 bytes; -this should be more than enough for any normal use of \s-1HKDF.\s0 -.ie n .IP """mode"" (\fB\s-1OSSL_KDF_PARAM_MODE\s0\fR) <\s-1UTF8\s0 string> or <integer>" 4 -.el .IP "``mode'' (\fB\s-1OSSL_KDF_PARAM_MODE\s0\fR) <\s-1UTF8\s0 string> or <integer>" 4 -.IX Item "mode (OSSL_KDF_PARAM_MODE) <UTF8 string> or <integer>" -This parameter sets the mode for the \s-1HKDF\s0 operation. +this should be more than enough for any normal use of HKDF. +.IP """mode"" (\fBOSSL_KDF_PARAM_MODE\fR) <UTF8 string> or <integer>" 4 +.IX Item """mode"" (OSSL_KDF_PARAM_MODE) <UTF8 string> or <integer>" +This parameter sets the mode for the HKDF operation. There are three modes that are currently defined: .RS 4 -.ie n .IP """\s-1EXTRACT_AND_EXPAND""\s0 or \fB\s-1EVP_KDF_HKDF_MODE_EXTRACT_AND_EXPAND\s0\fR" 4 -.el .IP "``\s-1EXTRACT_AND_EXPAND''\s0 or \fB\s-1EVP_KDF_HKDF_MODE_EXTRACT_AND_EXPAND\s0\fR" 4 -.IX Item "EXTRACT_AND_EXPAND or EVP_KDF_HKDF_MODE_EXTRACT_AND_EXPAND" -This is the default mode. Calling \fBEVP_KDF_derive\fR\|(3) on an \s-1EVP_KDF_CTX\s0 set -up for \s-1HKDF\s0 will perform an extract followed by an expand operation in one go. +.IP """EXTRACT_AND_EXPAND"" or \fBEVP_KDF_HKDF_MODE_EXTRACT_AND_EXPAND\fR" 4 +.IX Item """EXTRACT_AND_EXPAND"" or EVP_KDF_HKDF_MODE_EXTRACT_AND_EXPAND" +This is the default mode. Calling \fBEVP_KDF_derive\fR\|(3) on an EVP_KDF_CTX set +up for HKDF will perform an extract followed by an expand operation in one go. The derived key returned will be the result after the expand operation. The intermediate fixed-length pseudorandom key K is not returned. .Sp In this mode the digest, key, salt and info values must be set before a key is derived otherwise an error will occur. -.ie n .IP """\s-1EXTRACT_ONLY""\s0 or \fB\s-1EVP_KDF_HKDF_MODE_EXTRACT_ONLY\s0\fR" 4 -.el .IP "``\s-1EXTRACT_ONLY''\s0 or \fB\s-1EVP_KDF_HKDF_MODE_EXTRACT_ONLY\s0\fR" 4 -.IX Item "EXTRACT_ONLY or EVP_KDF_HKDF_MODE_EXTRACT_ONLY" +.IP """EXTRACT_ONLY"" or \fBEVP_KDF_HKDF_MODE_EXTRACT_ONLY\fR" 4 +.IX Item """EXTRACT_ONLY"" or EVP_KDF_HKDF_MODE_EXTRACT_ONLY" In this mode calling \fBEVP_KDF_derive\fR\|(3) will just perform the extract operation. The value returned will be the intermediate fixed-length pseudorandom key K. The \fIkeylen\fR parameter must match the size of K, which can be looked @@ -202,9 +120,8 @@ up by calling \fBEVP_KDF_CTX_get_kdf_size()\fR after setting the mode and digest .Sp The digest, key and salt values must be set before a key is derived otherwise an error will occur. -.ie n .IP """\s-1EXPAND_ONLY""\s0 or \fB\s-1EVP_KDF_HKDF_MODE_EXPAND_ONLY\s0\fR" 4 -.el .IP "``\s-1EXPAND_ONLY''\s0 or \fB\s-1EVP_KDF_HKDF_MODE_EXPAND_ONLY\s0\fR" 4 -.IX Item "EXPAND_ONLY or EVP_KDF_HKDF_MODE_EXPAND_ONLY" +.IP """EXPAND_ONLY"" or \fBEVP_KDF_HKDF_MODE_EXPAND_ONLY\fR" 4 +.IX Item """EXPAND_ONLY"" or EVP_KDF_HKDF_MODE_EXPAND_ONLY" In this mode calling \fBEVP_KDF_derive\fR\|(3) will just perform the expand operation. The input key should be set to the intermediate fixed-length pseudorandom key K returned from a previous extract operation. @@ -214,25 +131,41 @@ an error will occur. .RE .RS 4 .RE -.SH "NOTES" +.PP +The OpenSSL FIPS provider also supports the following parameters: +.IP """fips-indicator"" (\fBOSSL_KDF_PARAM_FIPS_APPROVED_INDICATOR\fR) <integer>" 4 +.IX Item """fips-indicator"" (OSSL_KDF_PARAM_FIPS_APPROVED_INDICATOR) <integer>" +A getter that returns 1 if the operation is FIPS approved, or 0 otherwise. +This may be used after calling EVP_KDF_derive. It returns 0 if "key-check" +is set to 0 and the check fails. +.IP """key-check"" (\fBOSSL_KDF_PARAM_FIPS_KEY_CHECK\fR) <integer>" 4 +.IX Item """key-check"" (OSSL_KDF_PARAM_FIPS_KEY_CHECK) <integer>" +The default value of 1 causes an error during \fBEVP_KDF_CTX_set_params()\fR if the +length of used key-derivation key (\fBOSSL_KDF_PARAM_KEY\fR) is shorter than 112 +bits. +Setting this to zero will ignore the error and set the approved +"fips-indicator" to 0. +This option breaks FIPS compliance if it causes the approved "fips-indicator" +to return 0. +.SH NOTES .IX Header "NOTES" -A context for \s-1HKDF\s0 can be obtained by calling: +A context for HKDF can be obtained by calling: .PP .Vb 2 \& EVP_KDF *kdf = EVP_KDF_fetch(NULL, "HKDF", NULL); \& EVP_KDF_CTX *kctx = EVP_KDF_CTX_new(kdf); .Ve .PP -The output length of an \s-1HKDF\s0 expand operation is specified via the \fIkeylen\fR +The output length of an HKDF expand operation is specified via the \fIkeylen\fR parameter to the \fBEVP_KDF_derive\fR\|(3) function. When using -\&\s-1EVP_KDF_HKDF_MODE_EXTRACT_ONLY\s0 the \fIkeylen\fR parameter must equal the size of +EVP_KDF_HKDF_MODE_EXTRACT_ONLY the \fIkeylen\fR parameter must equal the size of the intermediate fixed-length pseudorandom key otherwise an error will occur. For that mode, the fixed output size can be looked up by calling \fBEVP_KDF_CTX_get_kdf_size()\fR -after setting the mode and digest on the \fB\s-1EVP_KDF_CTX\s0\fR. -.SH "EXAMPLES" +after setting the mode and digest on the \fBEVP_KDF_CTX\fR. +.SH EXAMPLES .IX Header "EXAMPLES" -This example derives 10 bytes using \s-1SHA\-256\s0 with the secret key \*(L"secret\*(R", -salt value \*(L"salt\*(R" and info value \*(L"label\*(R": +This example derives 10 bytes using SHA\-256 with the secret key "secret", +salt value "salt" and info value "label": .PP .Vb 4 \& EVP_KDF *kdf; @@ -261,25 +194,25 @@ salt value \*(L"salt\*(R" and info value \*(L"label\*(R": .Ve .SH "CONFORMING TO" .IX Header "CONFORMING TO" -\&\s-1RFC 5869\s0 +RFC 5869 .SH "SEE ALSO" .IX Header "SEE ALSO" -\&\s-1\fBEVP_KDF\s0\fR\|(3), +\&\fBEVP_KDF\fR\|(3), \&\fBEVP_KDF_CTX_new\fR\|(3), \&\fBEVP_KDF_CTX_free\fR\|(3), \&\fBEVP_KDF_CTX_get_kdf_size\fR\|(3), \&\fBEVP_KDF_CTX_set_params\fR\|(3), \&\fBEVP_KDF_derive\fR\|(3), -\&\*(L"\s-1PARAMETERS\*(R"\s0 in \s-1\fBEVP_KDF\s0\fR\|(3), -\&\s-1\fBEVP_KDF\-TLS13_KDF\s0\fR\|(7) -.SH "HISTORY" +"PARAMETERS" in \fBEVP_KDF\fR\|(3), +\&\fBEVP_KDF\-TLS13_KDF\fR\|(7) +.SH HISTORY .IX Header "HISTORY" This functionality was added in OpenSSL 3.0. -.SH "COPYRIGHT" +.SH COPYRIGHT .IX Header "COPYRIGHT" -Copyright 2016\-2021 The OpenSSL Project Authors. All Rights Reserved. +Copyright 2016\-2024 The OpenSSL Project Authors. All Rights Reserved. .PP -Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use +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 \s-1LICENSE\s0 in the source distribution or at +in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>. |