OPENSSL-RAND(1ssl) OpenSSL OPENSSL-RAND(1ssl) openssl-rand - openssl rand [-help] [-out ] [-base64] [-hex] [-engine ] [-rand ] [-writerand ] [-provider ] [-provider-path ] [-provparam [:]=] [-propquery ] [K|M|G|T] (CSPRNG). [K|M|G|T] KiB/MiB/GiB/TiB . (K = 1024 M = 1024*1024 ). 'max' num CSPRNG . 2^61 NIST SP 800-90C. RAND_bytes(3) 256 . . RAND_bytes(3) RAND(7) EVP_RAND(7). -help . -out . -base64 base64 . -hex . -engine id " " openssl(1). . -rand -writerand " " openssl(1) . -provider -provider-path -provparam [:]= -propquery propq " " openssl(1) provider(7) property(7). openssl(1) RAND_bytes(3) RAND(7) EVP_RAND(7) -engine OpenSSL 3.0. 2000-2021 OpenSSL. . Apache 2.0 ( ""). . LICENSE . 3 . . : . 3.6.2 7 2026 OPENSSL-RAND(1ssl)