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|
=pod
=head1 NAME
EVP_RAND-HMAC-DRBG - The HMAC DRBG EVP_RAND implementation
=head1 DESCRIPTION
Support for the HMAC deterministic random bit generator through the
B<EVP_RAND> API.
=head2 Identity
"HMAC-DRBG" is the name for this implementation; it can be used with the
EVP_RAND_fetch() function.
=head2 Supported parameters
The supported parameters are:
=over 4
=item "state" (B<OSSL_RAND_PARAM_STATE>) <integer>
=item "strength" (B<OSSL_RAND_PARAM_STRENGTH>) <unsigned integer>
=item "max_request" (B<OSSL_RAND_PARAM_MAX_REQUEST>) <unsigned integer>
=item "reseed_requests" (B<OSSL_DRBG_PARAM_RESEED_REQUESTS>) <unsigned integer>
=item "reseed_time_interval" (B<OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL>) <integer>
=item "min_entropylen" (B<OSSL_DRBG_PARAM_MIN_ENTROPYLEN>) <unsigned integer>
=item "max_entropylen" (B<OSSL_DRBG_PARAM_MAX_ENTROPYLEN>) <unsigned integer>
=item "min_noncelen" (B<OSSL_DRBG_PARAM_MIN_NONCELEN>) <unsigned integer>
=item "max_noncelen" (B<OSSL_DRBG_PARAM_MAX_NONCELEN>) <unsigned integer>
=item "max_perslen" (B<OSSL_DRBG_PARAM_MAX_PERSLEN>) <unsigned integer>
=item "max_adinlen" (B<OSSL_DRBG_PARAM_MAX_ADINLEN>) <unsigned integer>
=item "reseed_counter" (B<OSSL_DRBG_PARAM_RESEED_COUNTER>) <unsigned integer>
=item "properties" (B<OSSL_DRBG_PARAM_PROPERTIES>) <UTF8 string>
=item "mac" (B<OSSL_DRBG_PARAM_MAC>) <UTF8 string>
=item "digest" (B<OSSL_DRBG_PARAM_DIGEST>) <UTF8 string>
These parameters work as described in L<EVP_RAND(3)/PARAMETERS>.
=back
=head1 NOTES
When using the FIPS provider, only these digests are permitted (as per
L<FIPS 140-3 IG D.R|https://csrc.nist.gov/CSRC/media/Projects/cryptographic-module-validation-program/documents/fips%20140-3/FIPS%20140-3%20IG.pdf>):
=over 4
=item SHA-1
=item SHA2-256
=item SHA2-512
=item SHA3-256
=item SHA3-512
=back
A context for HMAC DRBG can be obtained by calling:
EVP_RAND *rand = EVP_RAND_fetch(NULL, "HMAC-DRBG", NULL);
EVP_RAND_CTX *rctx = EVP_RAND_CTX_new(rand);
=head1 EXAMPLES
EVP_RAND *rand;
EVP_RAND_CTX *rctx;
unsigned char bytes[100];
OSSL_PARAM params[3], *p = params;
unsigned int strength = 128;
rand = EVP_RAND_fetch(NULL, "HMAC-DRBG", NULL);
rctx = EVP_RAND_CTX_new(rand, NULL);
EVP_RAND_free(rand);
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_DRBG_PARAM_MAC, SN_hmac, 0);
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_DRBG_PARAM_DIGEST, SN_sha256, 0);
*p = OSSL_PARAM_construct_end();
EVP_RAND_instantiate(rctx, strength, 0, NULL, 0, params);
EVP_RAND_generate(rctx, bytes, sizeof(bytes), strength, 0, NULL, 0);
EVP_RAND_CTX_free(rctx);
=head1 CONFORMING TO
NIST SP 800-90A and SP 800-90B
=head1 SEE ALSO
L<EVP_RAND(3)>,
L<EVP_RAND(3)/PARAMETERS>,
L<openssl-fipsinstall(1)>
=head1 HISTORY
OpenSSL 3.1.1 introduced the B<-no_drbg_truncated_digests> option to
fipsinstall which restricts the permitted digests when using the FIPS
provider in a complaint manner. For details refer to
L<FIPS 140-3 IG D.R|https://csrc.nist.gov/CSRC/media/Projects/cryptographic-module-validation-program/documents/fips%20140-3/FIPS%20140-3%20IG.pdf>).
=head1 COPYRIGHT
Copyright 2020-2021 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
L<https://www.openssl.org/source/license.html>.
=cut
|
