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Diffstat (limited to 'upstream/debian-unstable/man7/EVP_KDF-SSHKDF.7ssl')
| -rw-r--r-- | upstream/debian-unstable/man7/EVP_KDF-SSHKDF.7ssl | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/upstream/debian-unstable/man7/EVP_KDF-SSHKDF.7ssl b/upstream/debian-unstable/man7/EVP_KDF-SSHKDF.7ssl new file mode 100644 index 00000000..7ff3f699 --- /dev/null +++ b/upstream/debian-unstable/man7/EVP_KDF-SSHKDF.7ssl @@ -0,0 +1,202 @@ +.\" -*- mode: troff; coding: utf-8 -*- +.\" Automatically generated by Pod::Man 5.01 (Pod::Simple 3.43) +.\" +.\" 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 +.. +.\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>. +.ie n \{\ +. ds C` "" +. ds C' "" +'br\} +.el\{\ +. ds C` +. ds C' +'br\} +.\" +.\" Escape single quotes in literal strings from groff's Unicode transform. +.ie \n(.g .ds Aq \(aq +.el .ds Aq ' +.\" +.\" If the F register is >0, we'll generate index entries on stderr for +.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index +.\" entries marked with X<> in POD. Of course, you'll have to process the +.\" output yourself in some meaningful fashion. +.\" +.\" Avoid warning from groff about undefined register 'F'. +.de IX +.. +.nr rF 0 +.if \n(.g .if rF .nr rF 1 +.if (\n(rF:(\n(.g==0)) \{\ +. if \nF \{\ +. de IX +. tm Index:\\$1\t\\n%\t"\\$2" +.. +. if !\nF==2 \{\ +. nr % 0 +. nr F 2 +. \} +. \} +.\} +.rr rF +.\" ======================================================================== +.\" +.IX Title "EVP_KDF-SSHKDF 7SSL" +.TH EVP_KDF-SSHKDF 7SSL 2024-02-03 3.1.5 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\-SSHKDF \- The SSHKDF EVP_KDF implementation +.SH DESCRIPTION +.IX Header "DESCRIPTION" +Support for computing the \fBSSHKDF\fR KDF through the \fBEVP_KDF\fR API. +.PP +The EVP_KDF\-SSHKDF algorithm implements the SSHKDF key derivation function. +It is defined in RFC 4253, section 7.2 and is used by SSH to derive IVs, +encryption keys and integrity keys. +Five inputs are required to perform key derivation: The hashing function +(for example SHA256), the Initial Key, the Exchange Hash, the Session ID, +and the derivation key type. +.SS Identity +.IX Subsection "Identity" +"SSHKDF" 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: +.IP """properties"" (\fBOSSL_KDF_PARAM_PROPERTIES\fR) <UTF8 string>" 4 +.IX Item """properties"" (OSSL_KDF_PARAM_PROPERTIES) <UTF8 string>" +.PD 0 +.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>" +.PD +These parameters work as described in "PARAMETERS" in \fBEVP_KDF\fR\|(3). +.IP """xcghash"" (\fBOSSL_KDF_PARAM_SSHKDF_XCGHASH\fR) <octet string>" 4 +.IX Item """xcghash"" (OSSL_KDF_PARAM_SSHKDF_XCGHASH) <octet string>" +.PD 0 +.IP """session_id"" (\fBOSSL_KDF_PARAM_SSHKDF_SESSION_ID\fR) <octet string>" 4 +.IX Item """session_id"" (OSSL_KDF_PARAM_SSHKDF_SESSION_ID) <octet string>" +.PD +These parameters set the respective values for the KDF. +If a value is already set, the contents are replaced. +.IP """type"" (\fBOSSL_KDF_PARAM_SSHKDF_TYPE\fR) <UTF8 string>" 4 +.IX Item """type"" (OSSL_KDF_PARAM_SSHKDF_TYPE) <UTF8 string>" +This parameter sets the type for the SSHKDF operation. +There are six supported types: +.RS 4 +.IP EVP_KDF_SSHKDF_TYPE_INITIAL_IV_CLI_TO_SRV 4 +.IX Item "EVP_KDF_SSHKDF_TYPE_INITIAL_IV_CLI_TO_SRV" +The Initial IV from client to server. +A single char of value 65 (ASCII char 'A'). +.IP EVP_KDF_SSHKDF_TYPE_INITIAL_IV_SRV_TO_CLI 4 +.IX Item "EVP_KDF_SSHKDF_TYPE_INITIAL_IV_SRV_TO_CLI" +The Initial IV from server to client +A single char of value 66 (ASCII char 'B'). +.IP EVP_KDF_SSHKDF_TYPE_ENCRYPTION_KEY_CLI_TO_SRV 4 +.IX Item "EVP_KDF_SSHKDF_TYPE_ENCRYPTION_KEY_CLI_TO_SRV" +The Encryption Key from client to server +A single char of value 67 (ASCII char 'C'). +.IP EVP_KDF_SSHKDF_TYPE_ENCRYPTION_KEY_SRV_TO_CLI 4 +.IX Item "EVP_KDF_SSHKDF_TYPE_ENCRYPTION_KEY_SRV_TO_CLI" +The Encryption Key from server to client +A single char of value 68 (ASCII char 'D'). +.IP EVP_KDF_SSHKDF_TYPE_INTEGRITY_KEY_CLI_TO_SRV 4 +.IX Item "EVP_KDF_SSHKDF_TYPE_INTEGRITY_KEY_CLI_TO_SRV" +The Integrity Key from client to server +A single char of value 69 (ASCII char 'E'). +.IP EVP_KDF_SSHKDF_TYPE_INTEGRITY_KEY_SRV_TO_CLI 4 +.IX Item "EVP_KDF_SSHKDF_TYPE_INTEGRITY_KEY_SRV_TO_CLI" +The Integrity Key from client to server +A single char of value 70 (ASCII char 'F'). +.RE +.RS 4 +.RE +.SH NOTES +.IX Header "NOTES" +A context for SSHKDF can be obtained by calling: +.PP +.Vb 2 +\& EVP_KDF *kdf = EVP_KDF_fetch(NULL, "SSHKDF", NULL); +\& EVP_KDF_CTX *kctx = EVP_KDF_CTX_new(kdf); +.Ve +.PP +The output length of the SSHKDF derivation is specified via the \fIkeylen\fR +parameter to the \fBEVP_KDF_derive\fR\|(3) function. +Since the SSHKDF output length is variable, calling \fBEVP_KDF_CTX_get_kdf_size\fR\|(3) +to obtain the requisite length is not meaningful. The caller must +allocate a buffer of the desired length, and pass that buffer to the +\&\fBEVP_KDF_derive\fR\|(3) function along with the desired length. +.SH EXAMPLES +.IX Header "EXAMPLES" +This example derives an 8 byte IV using SHA\-256 with a 1K "key" and appropriate +"xcghash" and "session_id" values: +.PP +.Vb 9 +\& EVP_KDF *kdf; +\& EVP_KDF_CTX *kctx; +\& char type = EVP_KDF_SSHKDF_TYPE_INITIAL_IV_CLI_TO_SRV; +\& unsigned char key[1024] = "01234..."; +\& unsigned char xcghash[32] = "012345..."; +\& unsigned char session_id[32] = "012345..."; +\& unsigned char out[8]; +\& size_t outlen = sizeof(out); +\& OSSL_PARAM params[6], *p = params; +\& +\& kdf = EVP_KDF_fetch(NULL, "SSHKDF", NULL); +\& kctx = EVP_KDF_CTX_new(kdf); +\& EVP_KDF_free(kdf); +\& +\& *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST, +\& SN_sha256, strlen(SN_sha256)); +\& *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY, +\& key, (size_t)1024); +\& *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SSHKDF_XCGHASH, +\& xcghash, (size_t)32); +\& *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SSHKDF_SESSION_ID, +\& session_id, (size_t)32); +\& *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_SSHKDF_TYPE, +\& &type, sizeof(type)); +\& *p = OSSL_PARAM_construct_end(); +\& if (EVP_KDF_derive(kctx, out, outlen, params) <= 0) +\& /* Error */ +.Ve +.SH "CONFORMING TO" +.IX Header "CONFORMING TO" +RFC 4253 +.SH "SEE ALSO" +.IX Header "SEE ALSO" +\&\fBEVP_KDF\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), +"PARAMETERS" in \fBEVP_KDF\fR\|(3) +.SH HISTORY +.IX Header "HISTORY" +This functionality was added in OpenSSL 3.0. +.SH COPYRIGHT +.IX Header "COPYRIGHT" +Copyright 2016\-2022 The OpenSSL Project Authors. All Rights Reserved. +.PP +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 LICENSE in the source distribution or at +<https://www.openssl.org/source/license.html>. |