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root@hanyw:~# man openssl-kdf |grep -Ev "^#34;
OPENSSL-KDF(1SSL)                                           OpenSSL                                           OPENSSL-KDF(1SSL)
NAME
       openssl-kdf - perform Key Derivation Function operations
SYNOPSIS
       openssl kdf [-help] [-cipher] [-digest] [-mac] [-kdfopt nm:v] [-keylen num] [-out filename] [-binary] [-provider name]
       [-provider-path path] [-propquery propq] kdf_name
DESCRIPTION
       The key derivation functions generate a derived key from either a secret or password.
OPTIONS
       -help
           Print a usage message.
       -keylen num
           The output size of the derived key. This field is required.
       -out filename
           Filename to output to, or standard output by default.
       -binary
           Output the derived key in binary form. Uses hexadecimal text format if not specified.
       -cipher name
           Specify the cipher to be used by the KDF.  Not all KDFs require a cipher and it is an error to use this option in
           such cases.
       -digest name
           Specify the digest to be used by the KDF.  Not all KDFs require a digest and it is an error to use this option in
           such cases.  To see the list of supported digests, use "openssl list -digest-commands".
       -mac name
           Specify the MAC to be used by the KDF.  Not all KDFs require a MAC and it is an error to use this option in such
           cases.
       -kdfopt nm:v
           Passes options to the KDF algorithm.  A comprehensive list of parameters can be found in the EVP_KDF_CTX
           implementation documentation.  Common parameter names used by EVP_KDF_CTX_set_params() are:
           key:string
               Specifies the secret key as an alphanumeric string (use if the key contains printable characters only).  The
               string length must conform to any restrictions of the KDF algorithm.  A key must be specified for most KDF
               algorithms.
           hexkey:string
               Specifies the secret key in hexadecimal form (two hex digits per byte).  The key length must conform to any
               restrictions of the KDF algorithm.  A key must be specified for most KDF algorithms.
           pass:string
               Specifies the password as an alphanumeric string (use if the password contains printable characters only).  The
               password must be specified for PBKDF2 and scrypt.
           hexpass:string
               Specifies the password in hexadecimal form (two hex digits per byte).  The password must be specified for PBKDF2
               and scrypt.
           digest:string
               This option is identical to the -digest option.
           cipher:string
               This option is identical to the -cipher option.
           mac:string
               This option is identical to the -mac option.
       -provider name
       -provider-path path
       -propquery propq
           See "Provider Options" in openssl(1), provider(7), and property(7).
       kdf_name
           Specifies the name of a supported KDF algorithm which will be used.  The supported algorithms names include
           TLS1-PRF, HKDF, SSKDF, PBKDF2, SSHKDF, X942KDF-ASN1, X942KDF-CONCAT, X963KDF and SCRYPT.
EXAMPLES
       Use TLS1-PRF to create a hex-encoded derived key from a secret key and seed:
           openssl kdf -keylen 16 -kdfopt digest:SHA2-256 -kdfopt key:secret \
                       -kdfopt seed:seed TLS1-PRF
       Use HKDF to create a hex-encoded derived key from a secret key, salt and info:
           openssl kdf -keylen 10 -kdfopt digest:SHA2-256 -kdfopt key:secret \
                       -kdfopt salt:salt -kdfopt info:label HKDF
       Use SSKDF with KMAC to create a hex-encoded derived key from a secret key, salt and info:
           openssl kdf -keylen 64 -kdfopt mac:KMAC-128 -kdfopt maclen:20 \
                       -kdfopt hexkey:b74a149a161545 -kdfopt hexinfo:348a37a2 \
                       -kdfopt hexsalt:3638271ccd68a2 SSKDF
       Use SSKDF with HMAC to create a hex-encoded derived key from a secret key, salt and info:
           openssl kdf -keylen 16 -kdfopt mac:HMAC -kdfopt digest:SHA2-256 \
                       -kdfopt hexkey:b74a149a -kdfopt hexinfo:348a37a2 \
                       -kdfopt hexsalt:3638271c SSKDF
       Use SSKDF with Hash to create a hex-encoded derived key from a secret key, salt and info:
           openssl kdf -keylen 14 -kdfopt digest:SHA2-256 \
                       -kdfopt hexkey:6dbdc23f045488 \
                       -kdfopt hexinfo:a1b2c3d4 SSKDF
       Use SSHKDF to create a hex-encoded derived key from a secret key, hash and session_id:
           openssl kdf -keylen 16 -kdfopt digest:SHA2-256 \
                       -kdfopt hexkey:0102030405 \
                       -kdfopt hexxcghash:06090A \
                       -kdfopt hexsession_id:01020304 \
                       -kdfopt type:A SSHKDF
       Use PBKDF2 to create a hex-encoded derived key from a password and salt:
           openssl kdf -keylen 32 -kdfopt digest:SHA256 -kdfopt pass:password \
                       -kdfopt salt:salt -kdfopt iter:2 PBKDF2
       Use scrypt to create a hex-encoded derived key from a password and salt:
           openssl kdf -keylen 64 -kdfopt pass:password -kdfopt salt:NaCl \
                       -kdfopt n:1024 -kdfopt r:8 -kdfopt p:16 \
                       -kdfopt maxmem_bytes:10485760 SCRYPT
NOTES
       The KDF mechanisms that are available will depend on the options used when building OpenSSL.
SEE ALSO
       openssl(1), openssl-pkeyutl(1), EVP_KDF(3), EVP_KDF-SCRYPT(7), EVP_KDF-TLS1_PRF(7), EVP_KDF-PBKDF2(7), EVP_KDF-HKDF(7),
       EVP_KDF-SS(7), EVP_KDF-SSHKDF(7), EVP_KDF-X942-ASN1(7), EVP_KDF-X942-CONCAT(7), EVP_KDF-X963(7)
HISTORY
       Added in OpenSSL 3.0
COPYRIGHT
       Copyright 2019-2022 The OpenSSL Project Authors. All Rights Reserved.
       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
       .
3.0.2                                                      2022-07-04                                         OPENSSL-KDF(1SSL)