EVP_RAND-CTR-DRBG
Section: OpenSSL (7SSL)
Updated: 2024-03-03
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NAME
EVP_RAND-CTR-DRBG - The CTR DRBG EVP_RAND implementation
DESCRIPTION
Support for the counter deterministic random bit generator through the
EVP_RAND API.
Identity
``CTR-DRBG'' is the name for this implementation; it can be used with the
EVP_RAND_fetch() function.
Supported parameters
The supported parameters are:
- "state" (OSSL_RAND_PARAM_STATE) <integer>
-
- "strength" (OSSL_RAND_PARAM_STRENGTH) <unsigned integer>
-
- "max_request" (OSSL_RAND_PARAM_MAX_REQUEST) <unsigned integer>
-
- "reseed_requests" (OSSL_DRBG_PARAM_RESEED_REQUESTS) <unsigned integer>
-
- "reseed_time_interval" (OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL) <integer>
-
- "min_entropylen" (OSSL_DRBG_PARAM_MIN_ENTROPYLEN) <unsigned integer>
-
- "max_entropylen" (OSSL_DRBG_PARAM_MAX_ENTROPYLEN) <unsigned integer>
-
- "min_noncelen" (OSSL_DRBG_PARAM_MIN_NONCELEN) <unsigned integer>
-
- "max_noncelen" (OSSL_DRBG_PARAM_MAX_NONCELEN) <unsigned integer>
-
- "max_perslen" (OSSL_DRBG_PARAM_MAX_PERSLEN) <unsigned integer>
-
- "max_adinlen" (OSSL_DRBG_PARAM_MAX_ADINLEN) <unsigned integer>
-
- "reseed_counter" (OSSL_DRBG_PARAM_RESEED_COUNTER) <unsigned integer>
-
- "properties" (OSSL_DRBG_PARAM_PROPERTIES) <UTF8 string>
-
- "cipher" (OSSL_DRBG_PARAM_CIPHER) <UTF8 string>
-
These parameters work as described in ``PARAMETERS'' in EVP_RAND(3).
- "use_derivation_function" (OSSL_DRBG_PARAM_USE_DF) <integer>
-
This Boolean indicates if a derivation function should be used or not.
A nonzero value (the default) uses the derivation function. A zero value
does not.
NOTES
A context for CTR DRBG can be obtained by calling:
EVP_RAND *rand = EVP_RAND_fetch(NULL, "CTR-DRBG", NULL);
EVP_RAND_CTX *rctx = EVP_RAND_CTX_new(rand);
EXAMPLES
EVP_RAND *rand;
EVP_RAND_CTX *rctx;
unsigned char bytes[100];
OSSL_PARAM params[2], *p = params;
unsigned int strength = 128;
rand = EVP_RAND_fetch(NULL, "CTR-DRBG", NULL);
rctx = EVP_RAND_CTX_new(rand, NULL);
EVP_RAND_free(rand);
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_DRBG_PARAM_CIPHER,
SN_aes_256_ctr, 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);
CONFORMING TO
NIST SP 800-90A and SP 800-90B
SEE ALSO
EVP_RAND(3),
``PARAMETERS'' in EVP_RAND(3)
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
<https://www.openssl.org/source/license.html>.
Index
- NAME
-
- DESCRIPTION
-
- Identity
-
- Supported parameters
-
- NOTES
-
- EXAMPLES
-
- CONFORMING TO
-
- SEE ALSO
-
- COPYRIGHT
-
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Time: 10:11:22 GMT, May 07, 2024