EVP_KDF-HMAC-DRBG

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

"HMAC-DRBG-KDF" is the name for this implementation; it can be used with the EVP_KDF_fetch() function.

Supported parameters

The supported parameters are:

"digest" (OSSL_DRBG_PARAM_DIGEST) <UTF8 string>

"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>

Sets the entropy bytes supplied to the HMAC-DRBG.

"nonce" (OSSL_KDF_PARAM_HMACDRBG_NONCE) <octet string>

Sets the nonce bytes supplied to the HMAC-DRBG.

A context for KDF HMAC DRBG can be obtained by calling:

 EVP_KDF *kdf = EVP_KDF_fetch(NULL, "HMAC-DRBG-KDF", NULL);
 EVP_KDF_CTX *kdf_ctx = EVP_KDF_CTX_new(kdf, NULL);

RFC 6979

The EVP_KDF-HMAC-DRBG functionality was added in OpenSSL 3.2.

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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.