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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-15 19:43:11 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-15 19:43:11 +0000
commitfc22b3d6507c6745911b9dfcc68f1e665ae13dbc (patch)
treece1e3bce06471410239a6f41282e328770aa404a /upstream/debian-bookworm/man7/EVP_KDF-X942-ASN1.7ssl
parentInitial commit. (diff)
downloadmanpages-l10n-fc22b3d6507c6745911b9dfcc68f1e665ae13dbc.tar.xz
manpages-l10n-fc22b3d6507c6745911b9dfcc68f1e665ae13dbc.zip
Adding upstream version 4.22.0.upstream/4.22.0
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+.\" ========================================================================
+.\"
+.IX Title "EVP_KDF-X942-ASN1 7SSL"
+.TH EVP_KDF-X942-ASN1 7SSL "2023-10-23" "3.0.11" "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"
+EVP_KDF\-X942\-ASN1 \- The X9.42\-2003 asn1 EVP_KDF implementation
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+The \s-1EVP_KDF\-X942\-ASN1\s0 algorithm implements the key derivation function
+X942KDF\-ASN1. It is used by \s-1DH\s0 KeyAgreement, to derive a key using input such as
+a shared secret key and other info. The other info is \s-1DER\s0 encoded data that
+contains a 32 bit counter as well as optional fields for \*(L"partyu-info\*(R",
+\&\*(L"partyv-info\*(R", \*(L"supp-pubinfo\*(R" and \*(L"supp-privinfo\*(R".
+This kdf is used by Cryptographic Message Syntax (\s-1CMS\s0).
+.SS "Identity"
+.IX Subsection "Identity"
+\&\*(L"X942KDF\-ASN1\*(R" or \*(L"X942KDF\*(R" 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>"
+.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>"
+.PD
+These parameters work as described in \*(L"\s-1PARAMETERS\*(R"\s0 in \s-1\fBEVP_KDF\s0\fR\|(3).
+.ie n .IP """secret"" (\fB\s-1OSSL_KDF_PARAM_SECRET\s0\fR) <octet string>" 4
+.el .IP "``secret'' (\fB\s-1OSSL_KDF_PARAM_SECRET\s0\fR) <octet string>" 4
+.IX Item "secret (OSSL_KDF_PARAM_SECRET) <octet string>"
+The shared secret used for key derivation. This parameter sets the secret.
+.ie n .IP """acvp-info"" (\fB\s-1OSSL_KDF_PARAM_X942_ACVPINFO\s0\fR) <octet string>" 4
+.el .IP "``acvp-info'' (\fB\s-1OSSL_KDF_PARAM_X942_ACVPINFO\s0\fR) <octet string>" 4
+.IX Item "acvp-info (OSSL_KDF_PARAM_X942_ACVPINFO) <octet string>"
+This value should not be used in production and should only be used for \s-1ACVP\s0
+testing. It is an optional octet string containing a combined \s-1DER\s0 encoded blob
+of any of the optional fields related to \*(L"partyu-info\*(R", \*(L"partyv-info\*(R",
+\&\*(L"supp-pubinfo\*(R" and \*(L"supp-privinfo\*(R". If it is specified then none of these other
+fields should be used.
+.ie n .IP """partyu-info"" (\fB\s-1OSSL_KDF_PARAM_X942_PARTYUINFO\s0\fR) <octet string>" 4
+.el .IP "``partyu-info'' (\fB\s-1OSSL_KDF_PARAM_X942_PARTYUINFO\s0\fR) <octet string>" 4
+.IX Item "partyu-info (OSSL_KDF_PARAM_X942_PARTYUINFO) <octet string>"
+An optional octet string containing public info contributed by the initiator.
+.ie n .IP """ukm"" (\fB\s-1OSSL_KDF_PARAM_UKM\s0\fR) <octet string>" 4
+.el .IP "``ukm'' (\fB\s-1OSSL_KDF_PARAM_UKM\s0\fR) <octet string>" 4
+.IX Item "ukm (OSSL_KDF_PARAM_UKM) <octet string>"
+An alias for \*(L"partyu-info\*(R".
+In \s-1CMS\s0 this is the user keying material.
+.ie n .IP """partyv-info"" (\fB\s-1OSSL_KDF_PARAM_X942_PARTYVINFO\s0\fR) <octet string>" 4
+.el .IP "``partyv-info'' (\fB\s-1OSSL_KDF_PARAM_X942_PARTYVINFO\s0\fR) <octet string>" 4
+.IX Item "partyv-info (OSSL_KDF_PARAM_X942_PARTYVINFO) <octet string>"
+An optional octet string containing public info contributed by the responder.
+.ie n .IP """supp-pubinfo"" (\fB\s-1OSSL_KDF_PARAM_X942_SUPP_PUBINFO\s0\fR) <octet string>" 4
+.el .IP "``supp-pubinfo'' (\fB\s-1OSSL_KDF_PARAM_X942_SUPP_PUBINFO\s0\fR) <octet string>" 4
+.IX Item "supp-pubinfo (OSSL_KDF_PARAM_X942_SUPP_PUBINFO) <octet string>"
+An optional octet string containing some additional, mutually-known public
+information. Setting this value also sets \*(L"use-keybits\*(R" to 0.
+.ie n .IP """use-keybits"" (\fB\s-1OSSL_KDF_PARAM_X942_USE_KEYBITS\s0\fR) <integer>" 4
+.el .IP "``use-keybits'' (\fB\s-1OSSL_KDF_PARAM_X942_USE_KEYBITS\s0\fR) <integer>" 4
+.IX Item "use-keybits (OSSL_KDF_PARAM_X942_USE_KEYBITS) <integer>"
+The default value of 1 will use the \s-1KEK\s0 key length (in bits) as the
+\&\*(L"supp-pubinfo\*(R". A value of 0 disables setting the \*(L"supp-pubinfo\*(R".
+.ie n .IP """supp-privinfo"" (\fB\s-1OSSL_KDF_PARAM_X942_SUPP_PRIVINFO\s0\fR) <octet string>" 4
+.el .IP "``supp-privinfo'' (\fB\s-1OSSL_KDF_PARAM_X942_SUPP_PRIVINFO\s0\fR) <octet string>" 4
+.IX Item "supp-privinfo (OSSL_KDF_PARAM_X942_SUPP_PRIVINFO) <octet string>"
+An optional octet string containing some additional, mutually-known private
+information.
+.ie n .IP """cekalg"" (\fB\s-1OSSL_KDF_PARAM_CEK_ALG\s0\fR) <\s-1UTF8\s0 string>" 4
+.el .IP "``cekalg'' (\fB\s-1OSSL_KDF_PARAM_CEK_ALG\s0\fR) <\s-1UTF8\s0 string>" 4
+.IX Item "cekalg (OSSL_KDF_PARAM_CEK_ALG) <UTF8 string>"
+This parameter sets the \s-1CEK\s0 wrapping algorithm name.
+Valid values are \*(L"\s-1AES\-128\-WRAP\*(R", \*(L"AES\-192\-WRAP\*(R", \*(L"AES\-256\-WRAP\*(R"\s0 and \*(L"\s-1DES3\-WRAP\*(R".\s0
+.SH "NOTES"
+.IX Header "NOTES"
+A context for X942KDF can be obtained by calling:
+.PP
+.Vb 2
+\& EVP_KDF *kdf = EVP_KDF_fetch(NULL, "X942KDF", NULL);
+\& EVP_KDF_CTX *kctx = EVP_KDF_CTX_new(kdf);
+.Ve
+.PP
+The output length of an X942KDF is specified via the \fIkeylen\fR
+parameter to the \fBEVP_KDF_derive\fR\|(3) function.
+.SH "EXAMPLES"
+.IX Header "EXAMPLES"
+This example derives 24 bytes, with the secret key \*(L"secret\*(R" and random user
+keying material:
+.PP
+.Vb 5
+\& EVP_KDF_CTX *kctx;
+\& EVP_KDF_CTX *kctx;
+\& unsigned char out[192/8];
+\& unsignred char ukm[64];
+\& OSSL_PARAM params[5], *p = params;
+\&
+\& if (RAND_bytes(ukm, sizeof(ukm)) <= 0)
+\& error("RAND_bytes");
+\&
+\& kdf = EVP_KDF_fetch(NULL, "X942KDF", NULL);
+\& if (kctx == NULL)
+\& error("EVP_KDF_fetch");
+\& kctx = EVP_KDF_CTX_new(kdf);
+\& EVP_KDF_free(kdf);
+\& if (kctx == NULL)
+\& error("EVP_KDF_CTX_new");
+\&
+\& *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST, "SHA256", 0);
+\& *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SECRET,
+\& "secret", (size_t)6);
+\& *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_UKM, ukm, sizeof(ukm));
+\& *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_CEK_ALG, "AES\-256\-WRAP, 0);
+\& *p = OSSL_PARAM_construct_end();
+\& if (EVP_KDF_derive(kctx, out, sizeof(out), params) <= 0)
+\& error("EVP_KDF_derive");
+\&
+\& EVP_KDF_CTX_free(kctx);
+.Ve
+.SH "CONFORMING TO"
+.IX Header "CONFORMING TO"
+\&\s-1ANS1 X9.42\-2003
+RFC 2631\s0
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\s-1\fBEVP_KDF\s0\fR\|(3),
+\&\fBEVP_KDF_CTX_new\fR\|(3),
+\&\fBEVP_KDF_CTX_free\fR\|(3),
+\&\fBEVP_KDF_CTX_set_params\fR\|(3),
+\&\fBEVP_KDF_CTX_get_kdf_size\fR\|(3),
+\&\fBEVP_KDF_derive\fR\|(3),
+\&\*(L"\s-1PARAMETERS\*(R"\s0 in \s-1\fBEVP_KDF\s0\fR\|(3)
+.SH "HISTORY"
+.IX Header "HISTORY"
+This functionality was added in OpenSSL 3.0.
+.SH "COPYRIGHT"
+.IX Header "COPYRIGHT"
+Copyright 2019\-2022 The OpenSSL Project Authors. All Rights Reserved.
+.PP
+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>.