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Title "EVP_KDF-HMAC-DRBG 7ossl"
way too many mistakes in technical documents.
Automatically generated by Pod::Man 5.0102 (Pod::Simple 3.45)
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. ds C` "" . ds C' "" 'br\} . ds C` . ds C' 'br\}
Escape single quotes in literal strings from groff's Unicode transform.
If the F register is >0, we'll generate index entries on stderr for
titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
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Title "EVP_KDF-HMAC-DRBG 7ossl"
EVP_KDF-HMAC-DRBG 7ossl 2025-07-01 3.5.1 OpenSSL
For nroff, turn off justification. Always turn off hyphenation; it makesway too many mistakes in technical documents.
NAME
EVP_KDF-HMAC-DRBG
\- The HMAC DRBG DETERMINISTIC EVP_KDF implementation
DESCRIPTION
Header "DESCRIPTION" Support for a deterministic HMAC DRBG using the EVP_KDF API. This is similar
to EVP_RAND-HMAC-DRBG\|(7), but uses fixed values for its entropy and nonce
values. This is used to generate deterministic nonce value required by ECDSA
and DSA (as defined in RFC 6979).
Identity
Subsection "Identity" "HMAC-DRBG-KDF" is the name for this implementation; it can be used
with the EVP_KDF_fetch() function.
"Supported parameters"
Subsection "Supported parameters" The supported parameters are:
"""digest"" (OSSL_DRBG_PARAM_DIGEST) <UTF8 string>" 4
Item """digest"" (OSSL_DRBG_PARAM_DIGEST) <UTF8 string>" 0
"""properties"" (OSSL_DRBG_PARAM_PROPERTIES) <UTF8 string>" 4
Item """properties"" (OSSL_DRBG_PARAM_PROPERTIES) <UTF8 string>" These parameters work as described in "PARAMETERS" in EVP_KDF\|(3).
"""entropy"" (OSSL_KDF_PARAM_HMACDRBG_ENTROPY) <octet string>" 4
Item """entropy"" (OSSL_KDF_PARAM_HMACDRBG_ENTROPY) <octet string>" Sets the entropy bytes supplied to the HMAC-DRBG.
"""nonce"" (OSSL_KDF_PARAM_HMACDRBG_NONCE) <octet string>" 4
Item """nonce"" (OSSL_KDF_PARAM_HMACDRBG_NONCE) <octet string>" Sets the nonce bytes supplied to the HMAC-DRBG.
NOTES
Header "NOTES" A context for KDF HMAC DRBG can be obtained by calling:
.Vb 2 EVP_KDF *kdf = EVP_KDF_fetch(NULL, "HMAC-DRBG-KDF", NULL); EVP_KDF_CTX *kdf_ctx = EVP_KDF_CTX_new(kdf, NULL); .Ve
"CONFORMING TO"
Header "CONFORMING TO" RFC 6979
"SEE ALSO"
Header "SEE ALSO" \fBEVP_KDF\|(3),
"PARAMETERS" in EVP_KDF\|(3)
HISTORY
Header "HISTORY" The EVP_KDF-HMAC-DRBG functionality was added in OpenSSL 3.2.
COPYRIGHT
Header "COPYRIGHT" Copyright 2022-2023 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 <https://www.openssl.org/source/license.html>.