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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" EVP_RAND\-HASH\-DRBG \- The HASH DRBG EVP_RAND implementation .SH "DESCRIPTION" .IX Header "DESCRIPTION" Support for the hash deterministic random bit generator through the \&\fB\s-1EVP_RAND\s0\fR \s-1API.\s0 .SS "Identity" .IX Subsection "Identity" \&\*(L"HASH-DRBG\*(R" is the name for this implementation; it can be used with the \&\fBEVP_RAND_fetch()\fR function. .SS "Supported parameters" .IX Subsection "Supported parameters" The supported parameters are: .ie n .IP """state"" (\fB\s-1OSSL_RAND_PARAM_STATE\s0\fR) " 4 .el .IP "``state'' (\fB\s-1OSSL_RAND_PARAM_STATE\s0\fR) " 4 .IX Item "state (OSSL_RAND_PARAM_STATE) " .PD 0 .ie n .IP """strength"" (\fB\s-1OSSL_RAND_PARAM_STRENGTH\s0\fR) " 4 .el .IP "``strength'' (\fB\s-1OSSL_RAND_PARAM_STRENGTH\s0\fR) " 4 .IX Item "strength (OSSL_RAND_PARAM_STRENGTH) " .ie n .IP """max_request"" (\fB\s-1OSSL_RAND_PARAM_MAX_REQUEST\s0\fR) " 4 .el .IP "``max_request'' (\fB\s-1OSSL_RAND_PARAM_MAX_REQUEST\s0\fR) " 4 .IX Item "max_request (OSSL_RAND_PARAM_MAX_REQUEST) " .ie n .IP """reseed_requests"" (\fB\s-1OSSL_DRBG_PARAM_RESEED_REQUESTS\s0\fR) " 4 .el .IP "``reseed_requests'' (\fB\s-1OSSL_DRBG_PARAM_RESEED_REQUESTS\s0\fR) " 4 .IX Item "reseed_requests (OSSL_DRBG_PARAM_RESEED_REQUESTS) " .ie n .IP """reseed_time_interval"" (\fB\s-1OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL\s0\fR) " 4 .el .IP "``reseed_time_interval'' (\fB\s-1OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL\s0\fR) " 4 .IX Item "reseed_time_interval (OSSL_DRBG_PARAM_RESEED_TIME_INTERVAL) " .ie n .IP """min_entropylen"" (\fB\s-1OSSL_DRBG_PARAM_MIN_ENTROPYLEN\s0\fR) " 4 .el .IP "``min_entropylen'' (\fB\s-1OSSL_DRBG_PARAM_MIN_ENTROPYLEN\s0\fR) " 4 .IX Item "min_entropylen (OSSL_DRBG_PARAM_MIN_ENTROPYLEN) " .ie n .IP """max_entropylen"" (\fB\s-1OSSL_DRBG_PARAM_MAX_ENTROPYLEN\s0\fR) " 4 .el .IP "``max_entropylen'' (\fB\s-1OSSL_DRBG_PARAM_MAX_ENTROPYLEN\s0\fR) " 4 .IX Item "max_entropylen (OSSL_DRBG_PARAM_MAX_ENTROPYLEN) " .ie n .IP """min_noncelen"" (\fB\s-1OSSL_DRBG_PARAM_MIN_NONCELEN\s0\fR) " 4 .el .IP "``min_noncelen'' (\fB\s-1OSSL_DRBG_PARAM_MIN_NONCELEN\s0\fR) " 4 .IX Item "min_noncelen (OSSL_DRBG_PARAM_MIN_NONCELEN) " .ie n .IP """max_noncelen"" (\fB\s-1OSSL_DRBG_PARAM_MAX_NONCELEN\s0\fR) " 4 .el .IP "``max_noncelen'' (\fB\s-1OSSL_DRBG_PARAM_MAX_NONCELEN\s0\fR) " 4 .IX Item "max_noncelen (OSSL_DRBG_PARAM_MAX_NONCELEN) " .ie n .IP """max_perslen"" (\fB\s-1OSSL_DRBG_PARAM_MAX_PERSLEN\s0\fR) " 4 .el .IP "``max_perslen'' (\fB\s-1OSSL_DRBG_PARAM_MAX_PERSLEN\s0\fR) " 4 .IX Item "max_perslen (OSSL_DRBG_PARAM_MAX_PERSLEN) " .ie n .IP """max_adinlen"" (\fB\s-1OSSL_DRBG_PARAM_MAX_ADINLEN\s0\fR) " 4 .el .IP "``max_adinlen'' (\fB\s-1OSSL_DRBG_PARAM_MAX_ADINLEN\s0\fR) " 4 .IX Item "max_adinlen (OSSL_DRBG_PARAM_MAX_ADINLEN) " .ie n .IP """reseed_counter"" (\fB\s-1OSSL_DRBG_PARAM_RESEED_COUNTER\s0\fR) " 4 .el .IP "``reseed_counter'' (\fB\s-1OSSL_DRBG_PARAM_RESEED_COUNTER\s0\fR) " 4 .IX Item "reseed_counter (OSSL_DRBG_PARAM_RESEED_COUNTER) " .ie n .IP """properties"" (\fB\s-1OSSL_DRBG_PARAM_PROPERTIES\s0\fR) <\s-1UTF8\s0 string>" 4 .el .IP "``properties'' (\fB\s-1OSSL_DRBG_PARAM_PROPERTIES\s0\fR) <\s-1UTF8\s0 string>" 4 .IX Item "properties (OSSL_DRBG_PARAM_PROPERTIES) " .ie n .IP """digest"" (\fB\s-1OSSL_DRBG_PARAM_DIGEST\s0\fR) <\s-1UTF8\s0 string>" 4 .el .IP "``digest'' (\fB\s-1OSSL_DRBG_PARAM_DIGEST\s0\fR) <\s-1UTF8\s0 string>" 4 .IX Item "digest (OSSL_DRBG_PARAM_DIGEST) " .PD These parameters work as described in \*(L"\s-1PARAMETERS\*(R"\s0 in \s-1\fBEVP_RAND\s0\fR\|(3). .SH "NOTES" .IX Header "NOTES" A context for \s-1HASH DRBG\s0 can be obtained by calling: .PP .Vb 2 \& EVP_RAND *rand = EVP_RAND_fetch(NULL, "HASH\-DRBG", NULL); \& EVP_RAND_CTX *rctx = EVP_RAND_CTX_new(rand); .Ve .SH "EXAMPLES" .IX Header "EXAMPLES" .Vb 5 \& 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, "HASH\-DRBG", NULL); \& rctx = EVP_RAND_CTX_new(rand, NULL); \& EVP_RAND_free(rand); \& \& *p++ = OSSL_PARAM_construct_utf8_string(OSSL_DRBG_PARAM_DIGEST, SN_sha512, 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); .Ve .SH "CONFORMING TO" .IX Header "CONFORMING TO" \&\s-1NIST SP 800\-90A\s0 and \s-1SP 800\-90B\s0 .SH "SEE ALSO" .IX Header "SEE ALSO" \&\s-1\fBEVP_RAND\s0\fR\|(3), \&\*(L"\s-1PARAMETERS\*(R"\s0 in \s-1\fBEVP_RAND\s0\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2020\-2021 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at .