mirror of https://github.com/openssl/openssl
72 lines
1.6 KiB
Plaintext
72 lines
1.6 KiB
Plaintext
=pod
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=head1 NAME
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EVP_KDF-HMAC-DRBG
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- The HMAC DRBG DETERMINISTIC EVP_KDF implementation
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=head1 DESCRIPTION
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Support for a deterministic HMAC DRBG using the B<EVP_KDF> API. This is similar
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to L<EVP_RAND-HMAC-DRBG(7)>, but uses fixed values for its entropy and nonce
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values. This is used to generate deterministic nonce value required by ECDSA
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and DSA (as defined in RFC 6979).
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=head2 Identity
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"HMAC-DRBG-KDF" is the name for this implementation; it can be used
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with the EVP_KDF_fetch() function.
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=head2 Supported parameters
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The supported parameters are:
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=over 4
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=item "digest" (B<OSSL_DRBG_PARAM_DIGEST>) <UTF8 string>
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=item "properties" (B<OSSL_DRBG_PARAM_PROPERTIES>) <UTF8 string>
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These parameters work as described in L<EVP_KDF(3)/PARAMETERS>.
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=item "entropy" (B<OSSL_KDF_PARAM_HMACDRBG_ENTROPY>) <octet string>
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Sets the entropy bytes supplied to the HMAC-DRBG.
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=item "nonce" (B<OSSL_KDF_PARAM_HMACDRBG_NONCE>) <octet string>
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Sets the nonce bytes supplied to the HMAC-DRBG.
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=back
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=head1 NOTES
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A context for KDF HMAC DRBG can be obtained by calling:
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EVP_KDF *kdf = EVP_KDF_fetch(NULL, "HMAC-DRBG-KDF", NULL);
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EVP_KDF_CTX *kdf_ctx = EVP_KDF_CTX_new(kdf, NULL);
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=head1 CONFORMING TO
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RFC 6979
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=head1 SEE ALSO
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L<EVP_KDF(3)>,
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L<EVP_KDF(3)/PARAMETERS>
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=head1 HISTORY
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The EVP_KDF-HMAC-DRBG functionality was added in OpenSSL 3.2.
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=head1 COPYRIGHT
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Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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