256 lines
10 KiB
Plaintext
256 lines
10 KiB
Plaintext
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.\" ========================================================================
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.\"
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.IX Title "EVP_RAND-CTR-DRBG 7ossl"
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.TH EVP_RAND-CTR-DRBG 7ossl "2025-04-23" "3.5.1-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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EVP_RAND\-CTR\-DRBG \- The CTR DRBG EVP_RAND implementation
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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Support for the counter deterministic random bit generator through the
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\&\fB\s-1EVP_RAND\s0\fR \s-1API.\s0
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.SS "Identity"
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.IX Subsection "Identity"
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\&\*(L"CTR-DRBG\*(R" is the name for this implementation; it can be used with the
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\&\fIEVP_RAND_fetch()\fR function.
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.SS "Supported parameters"
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.IX Subsection "Supported parameters"
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The supported parameters are:
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.ie n .IP """state"" (\fB\s-1OSSL_RAND_PARAM_STATE\s0\fR) <integer>" 4
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.el .IP "``state'' (\fB\s-1OSSL_RAND_PARAM_STATE\s0\fR) <integer>" 4
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.IX Item "state (OSSL_RAND_PARAM_STATE) <integer>"
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.PD 0
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.ie n .IP """strength"" (\fB\s-1OSSL_RAND_PARAM_STRENGTH\s0\fR) <unsigned integer>" 4
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.el .IP "``strength'' (\fB\s-1OSSL_RAND_PARAM_STRENGTH\s0\fR) <unsigned integer>" 4
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.IX Item "strength (OSSL_RAND_PARAM_STRENGTH) <unsigned integer>"
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.ie n .IP """max_request"" (\fB\s-1OSSL_RAND_PARAM_MAX_REQUEST\s0\fR) <unsigned integer>" 4
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.el .IP "``max_request'' (\fB\s-1OSSL_RAND_PARAM_MAX_REQUEST\s0\fR) <unsigned integer>" 4
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.IX Item "max_request (OSSL_RAND_PARAM_MAX_REQUEST) <unsigned integer>"
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.ie n .IP """reseed_requests"" (\fB\s-1OSSL_DRBG_PARAM_RESEED_REQUESTS\s0\fR) <unsigned integer>" 4
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.el .IP "``reseed_requests'' (\fB\s-1OSSL_DRBG_PARAM_RESEED_REQUESTS\s0\fR) <unsigned integer>" 4
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.IX Item "reseed_requests (OSSL_DRBG_PARAM_RESEED_REQUESTS) <unsigned integer>"
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.ie n .IP """reseed_time_interval"" (\fB\s-1OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL\s0\fR) <integer>" 4
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.el .IP "``reseed_time_interval'' (\fB\s-1OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL\s0\fR) <integer>" 4
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.IX Item "reseed_time_interval (OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL) <integer>"
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.ie n .IP """min_entropylen"" (\fB\s-1OSSL_DRBG_PARAM_MIN_ENTROPYLEN\s0\fR) <unsigned integer>" 4
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.el .IP "``min_entropylen'' (\fB\s-1OSSL_DRBG_PARAM_MIN_ENTROPYLEN\s0\fR) <unsigned integer>" 4
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.IX Item "min_entropylen (OSSL_DRBG_PARAM_MIN_ENTROPYLEN) <unsigned integer>"
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.ie n .IP """max_entropylen"" (\fB\s-1OSSL_DRBG_PARAM_MAX_ENTROPYLEN\s0\fR) <unsigned integer>" 4
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.el .IP "``max_entropylen'' (\fB\s-1OSSL_DRBG_PARAM_MAX_ENTROPYLEN\s0\fR) <unsigned integer>" 4
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.IX Item "max_entropylen (OSSL_DRBG_PARAM_MAX_ENTROPYLEN) <unsigned integer>"
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.ie n .IP """min_noncelen"" (\fB\s-1OSSL_DRBG_PARAM_MIN_NONCELEN\s0\fR) <unsigned integer>" 4
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.el .IP "``min_noncelen'' (\fB\s-1OSSL_DRBG_PARAM_MIN_NONCELEN\s0\fR) <unsigned integer>" 4
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.IX Item "min_noncelen (OSSL_DRBG_PARAM_MIN_NONCELEN) <unsigned integer>"
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.ie n .IP """max_noncelen"" (\fB\s-1OSSL_DRBG_PARAM_MAX_NONCELEN\s0\fR) <unsigned integer>" 4
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.el .IP "``max_noncelen'' (\fB\s-1OSSL_DRBG_PARAM_MAX_NONCELEN\s0\fR) <unsigned integer>" 4
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.IX Item "max_noncelen (OSSL_DRBG_PARAM_MAX_NONCELEN) <unsigned integer>"
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.ie n .IP """max_perslen"" (\fB\s-1OSSL_DRBG_PARAM_MAX_PERSLEN\s0\fR) <unsigned integer>" 4
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.el .IP "``max_perslen'' (\fB\s-1OSSL_DRBG_PARAM_MAX_PERSLEN\s0\fR) <unsigned integer>" 4
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.IX Item "max_perslen (OSSL_DRBG_PARAM_MAX_PERSLEN) <unsigned integer>"
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.ie n .IP """max_adinlen"" (\fB\s-1OSSL_DRBG_PARAM_MAX_ADINLEN\s0\fR) <unsigned integer>" 4
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.el .IP "``max_adinlen'' (\fB\s-1OSSL_DRBG_PARAM_MAX_ADINLEN\s0\fR) <unsigned integer>" 4
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.IX Item "max_adinlen (OSSL_DRBG_PARAM_MAX_ADINLEN) <unsigned integer>"
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.ie n .IP """reseed_counter"" (\fB\s-1OSSL_DRBG_PARAM_RESEED_COUNTER\s0\fR) <unsigned integer>" 4
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.el .IP "``reseed_counter'' (\fB\s-1OSSL_DRBG_PARAM_RESEED_COUNTER\s0\fR) <unsigned integer>" 4
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.IX Item "reseed_counter (OSSL_DRBG_PARAM_RESEED_COUNTER) <unsigned integer>"
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.ie n .IP """properties"" (\fB\s-1OSSL_DRBG_PARAM_PROPERTIES\s0\fR) <\s-1UTF8\s0 string>" 4
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.el .IP "``properties'' (\fB\s-1OSSL_DRBG_PARAM_PROPERTIES\s0\fR) <\s-1UTF8\s0 string>" 4
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.IX Item "properties (OSSL_DRBG_PARAM_PROPERTIES) <UTF8 string>"
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.ie n .IP """cipher"" (\fB\s-1OSSL_DRBG_PARAM_CIPHER\s0\fR) <\s-1UTF8\s0 string>" 4
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.el .IP "``cipher'' (\fB\s-1OSSL_DRBG_PARAM_CIPHER\s0\fR) <\s-1UTF8\s0 string>" 4
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.IX Item "cipher (OSSL_DRBG_PARAM_CIPHER) <UTF8 string>"
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.PD
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These parameters work as described in \*(L"\s-1PARAMETERS\*(R"\s0 in \s-1\fIEVP_RAND\s0\fR\|(3).
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.ie n .IP """use_derivation_function"" (\fB\s-1OSSL_DRBG_PARAM_USE_DF\s0\fR) <integer>" 4
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.el .IP "``use_derivation_function'' (\fB\s-1OSSL_DRBG_PARAM_USE_DF\s0\fR) <integer>" 4
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.IX Item "use_derivation_function (OSSL_DRBG_PARAM_USE_DF) <integer>"
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This Boolean indicates if a derivation function should be used or not.
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A nonzero value (the default) uses the derivation function. A zero value
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does not.
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.SH "NOTES"
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.IX Header "NOTES"
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A context for \s-1CTR DRBG\s0 can be obtained by calling:
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.PP
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.Vb 2
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\& EVP_RAND *rand = EVP_RAND_fetch(NULL, "CTR\-DRBG", NULL);
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\& EVP_RAND_CTX *rctx = EVP_RAND_CTX_new(rand, NULL);
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.Ve
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.PP
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The default CTR-DRBG implementation attempts to fetch the required internal
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algorithms from the provider they are built into (eg the default provider)
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regardless of the properties provided. Should the provider not implement
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the required algorithms then properties will be used to find a different
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implementation.
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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.Vb 5
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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[2], *p = params;
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\& unsigned int strength = 128;
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\&
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\& rand = EVP_RAND_fetch(NULL, "CTR\-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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\&
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\& *p++ = OSSL_PARAM_construct_utf8_string(OSSL_DRBG_PARAM_CIPHER,
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\& SN_aes_256_ctr, 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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\&
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\& EVP_RAND_generate(rctx, bytes, sizeof(bytes), strength, 0, NULL, 0);
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\&
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\& EVP_RAND_CTX_free(rctx);
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.Ve
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.SH "CONFORMING TO"
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.IX Header "CONFORMING TO"
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\&\s-1NIST SP 800\-90A\s0 and \s-1SP 800\-90B\s0
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\s-1\fIEVP_RAND\s0\fR\|(3),
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\&\*(L"\s-1PARAMETERS\*(R"\s0 in \s-1\fIEVP_RAND\s0\fR\|(3)
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2020\-2025 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). 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 \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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