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Title "OPENSSL-KDF 1" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
openssl-kdf - perform Key Derivation Function operations Header "SYNOPSIS" \fBopenssl kdf [-help] [-cipher] [-digest] [-mac] [-kdfopt nm:v] [-keylen num] [-out filename] [-binary] [-provider name] [-provider-path path] [-propquery propq] \fIkdf_name Header "DESCRIPTION" The key derivation functions generate a derived key from either a secret or password. Header "OPTIONS" Item "-help" Print a usage message. Item "-keylen num" The output size of the derived key. This field is required. Item "-out filename" Filename to output to, or standard output by default. Item "-binary" Output the derived key in binary form. Uses hexadecimal text format if not specified. Item "-cipher name" Specify the cipher to be used by the \s-1KDF.\s0 Not all KDFs require a cipher and it is an error to use this option in such cases. Item "-digest name" Specify the digest to be used by the \s-1KDF.\s0 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 \*(C`openssl list -digest-commands\*(C'. Item "-mac name" Specify the \s-1MAC\s0 to be used by the \s-1KDF.\s0 Not all KDFs require a \s-1MAC\s0 and it is an error to use this option in such cases. Item "-kdfopt nm:v" Passes options to the \s-1KDF\s0 algorithm. A comprehensive list of parameters can be found in the \s-1EVP_KDF_CTX\s0 implementation documentation. Common parameter names used by EVP_KDF_CTX_set_params() are: Item "-provider name"

0

Item "-provider-path path" Item "-propquery propq"

See \*(L"Provider Options\*(R" in openssl\|(1), provider\|(7), and property\|(7).

Item "kdf_name" Specifies the name of a supported \s-1KDF\s0 algorithm which will be used. The supported algorithms names include \s-1TLS1-PRF, HKDF, SSKDF, PBKDF2, SSHKDF, X942KDF-ASN1, X942KDF-CONCAT, X963KDF\s0 and \s-1SCRYPT.\s0 Header "EXAMPLES" Use \s-1TLS1-PRF\s0 to create a hex-encoded derived key from a secret key and seed:

.Vb 2 openssl kdf -keylen 16 -kdfopt digest:SHA2-256 -kdfopt key:secret \e -kdfopt seed:seed TLS1-PRF .Ve

Use \s-1HKDF\s0 to create a hex-encoded derived key from a secret key, salt and info:

.Vb 2 openssl kdf -keylen 10 -kdfopt digest:SHA2-256 -kdfopt key:secret \e -kdfopt salt:salt -kdfopt info:label HKDF .Ve

Use \s-1SSKDF\s0 with \s-1KMAC\s0 to create a hex-encoded derived key from a secret key, salt and info:

.Vb 3 openssl kdf -keylen 64 -kdfopt mac:KMAC-128 -kdfopt maclen:20 \e -kdfopt hexkey:b74a149a161545 -kdfopt hexinfo:348a37a2 \e -kdfopt hexsalt:3638271ccd68a2 SSKDF .Ve

Use \s-1SSKDF\s0 with \s-1HMAC\s0 to create a hex-encoded derived key from a secret key, salt and info:

.Vb 3 openssl kdf -keylen 16 -kdfopt mac:HMAC -kdfopt digest:SHA2-256 \e -kdfopt hexkey:b74a149a -kdfopt hexinfo:348a37a2 \e -kdfopt hexsalt:3638271c SSKDF .Ve

Use \s-1SSKDF\s0 with Hash to create a hex-encoded derived key from a secret key, salt and info:

.Vb 3 openssl kdf -keylen 14 -kdfopt digest:SHA2-256 \e -kdfopt hexkey:6dbdc23f045488 \e -kdfopt hexinfo:a1b2c3d4 SSKDF .Ve

Use \s-1SSHKDF\s0 to create a hex-encoded derived key from a secret key, hash and session_id:

.Vb 5 openssl kdf -keylen 16 -kdfopt digest:SHA2-256 \e -kdfopt hexkey:0102030405 \e -kdfopt hexxcghash:06090A \e -kdfopt hexsession_id:01020304 \e -kdfopt type:A SSHKDF .Ve

Use \s-1PBKDF2\s0 to create a hex-encoded derived key from a password and salt:

.Vb 2 openssl kdf -keylen 32 -kdfopt digest:SHA256 -kdfopt pass:password \e -kdfopt salt:salt -kdfopt iter:2 PBKDF2 .Ve

Use scrypt to create a hex-encoded derived key from a password and salt:

.Vb 3 openssl kdf -keylen 64 -kdfopt pass:password -kdfopt salt:NaCl \e -kdfopt n:1024 -kdfopt r:8 -kdfopt p:16 \e -kdfopt maxmem_bytes:10485760 SCRYPT .Ve

Header "NOTES" The \s-1KDF\s0 mechanisms that are available will depend on the options used when building OpenSSL. Header "SEE ALSO" \fBopenssl\|(1), \fBopenssl-pkeyutl\|(1), \s-1EVP_KDF\s0\|(3), \s-1EVP_KDF-SCRYPT\s0\|(7), \s-1EVP_KDF-TLS1_PRF\s0\|(7), \s-1EVP_KDF-PBKDF2\s0\|(7), \s-1EVP_KDF-HKDF\s0\|(7), \s-1EVP_KDF-SS\s0\|(7), \s-1EVP_KDF-SSHKDF\s0\|(7), \s-1EVP_KDF-X942-ASN1\s0\|(7), \s-1EVP_KDF-X942-CONCAT\s0\|(7), \s-1EVP_KDF-X963\s0\|(7) Header "HISTORY" Added in OpenSSL 3.0 Header "COPYRIGHT" Copyright 2019-2022 The OpenSSL Project Authors. All Rights Reserved.

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>.