mirror of https://github.com/openssl/openssl
130 lines
3.4 KiB
Plaintext
130 lines
3.4 KiB
Plaintext
=pod
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=head1 NAME
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EVP_RAND-HMAC-DRBG - The HMAC DRBG EVP_RAND implementation
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=head1 DESCRIPTION
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Support for the HMAC deterministic random bit generator through the
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B<EVP_RAND> API.
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=head2 Identity
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"HMAC-DRBG" is the name for this implementation; it can be used with the
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EVP_RAND_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 "state" (B<OSSL_RAND_PARAM_STATE>) <integer>
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=item "strength" (B<OSSL_RAND_PARAM_STRENGTH>) <unsigned integer>
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=item "max_request" (B<OSSL_RAND_PARAM_MAX_REQUEST>) <unsigned integer>
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=item "reseed_requests" (B<OSSL_DRBG_PARAM_RESEED_REQUESTS>) <unsigned integer>
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=item "reseed_time_interval" (B<OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL>) <integer>
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=item "min_entropylen" (B<OSSL_DRBG_PARAM_MIN_ENTROPYLEN>) <unsigned integer>
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=item "max_entropylen" (B<OSSL_DRBG_PARAM_MAX_ENTROPYLEN>) <unsigned integer>
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=item "min_noncelen" (B<OSSL_DRBG_PARAM_MIN_NONCELEN>) <unsigned integer>
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=item "max_noncelen" (B<OSSL_DRBG_PARAM_MAX_NONCELEN>) <unsigned integer>
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=item "max_perslen" (B<OSSL_DRBG_PARAM_MAX_PERSLEN>) <unsigned integer>
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=item "max_adinlen" (B<OSSL_DRBG_PARAM_MAX_ADINLEN>) <unsigned integer>
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=item "reseed_counter" (B<OSSL_DRBG_PARAM_RESEED_COUNTER>) <unsigned integer>
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=item "properties" (B<OSSL_DRBG_PARAM_PROPERTIES>) <UTF8 string>
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=item "mac" (B<OSSL_DRBG_PARAM_MAC>) <UTF8 string>
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=item "digest" (B<OSSL_DRBG_PARAM_DIGEST>) <UTF8 string>
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These parameters work as described in L<EVP_RAND(3)/PARAMETERS>.
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=back
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=head1 NOTES
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When using the FIPS provider, only these digests are permitted (as per
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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>):
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=over 4
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=item SHA-1
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=item SHA2-256
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=item SHA2-512
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=item SHA3-256
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=item SHA3-512
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=back
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A context for HMAC DRBG can be obtained by calling:
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EVP_RAND *rand = EVP_RAND_fetch(NULL, "HMAC-DRBG", NULL);
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EVP_RAND_CTX *rctx = EVP_RAND_CTX_new(rand, NULL);
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=head1 EXAMPLES
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EVP_RAND *rand;
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EVP_RAND_CTX *rctx;
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unsigned char bytes[100];
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OSSL_PARAM params[3], *p = params;
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unsigned int strength = 128;
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rand = EVP_RAND_fetch(NULL, "HMAC-DRBG", NULL);
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rctx = EVP_RAND_CTX_new(rand, NULL);
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EVP_RAND_free(rand);
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*p++ = OSSL_PARAM_construct_utf8_string(OSSL_DRBG_PARAM_MAC, SN_hmac, 0);
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*p++ = OSSL_PARAM_construct_utf8_string(OSSL_DRBG_PARAM_DIGEST, SN_sha256, 0);
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*p = OSSL_PARAM_construct_end();
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EVP_RAND_instantiate(rctx, strength, 0, NULL, 0, params);
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EVP_RAND_generate(rctx, bytes, sizeof(bytes), strength, 0, NULL, 0);
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EVP_RAND_CTX_free(rctx);
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=head1 CONFORMING TO
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NIST SP 800-90A and SP 800-90B
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=head1 SEE ALSO
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L<EVP_RAND(3)>,
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L<EVP_RAND(3)/PARAMETERS>,
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L<openssl-fipsinstall(1)>
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=head1 HISTORY
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OpenSSL 3.1.1 introduced the B<-no_drbg_truncated_digests> option to
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fipsinstall which restricts the permitted digests when using the FIPS
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provider in a complaint manner. For details refer to
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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>).
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=head1 COPYRIGHT
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Copyright 2020-2023 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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