1OPENSSL-RAND(1ossl) OpenSSL OPENSSL-RAND(1ossl)
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6 openssl-rand - generate pseudo-random bytes
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9 openssl rand [-help] [-out file] [-base64] [-hex] [-engine id] [-rand
10 files] [-writerand file] [-provider name] [-provider-path path]
11 [-propquery propq] num
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14 This command generates num random bytes using a cryptographically
15 secure pseudo random number generator (CSPRNG).
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17 The random bytes are generated using the RAND_bytes(3) function, which
18 provides a security level of 256 bits, provided it managed to seed
19 itself successfully from a trusted operating system entropy source.
20 Otherwise, the command will fail with a nonzero error code. For more
21 details, see RAND_bytes(3), RAND(7), and EVP_RAND(7).
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24 -help
25 Print out a usage message.
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27 -out file
28 Write to file instead of standard output.
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30 -base64
31 Perform base64 encoding on the output.
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33 -hex
34 Show the output as a hex string.
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36 -engine id
37 See "Engine Options" in openssl(1). This option is deprecated.
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39 -rand files, -writerand file
40 See "Random State Options" in openssl(1) for details.
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42 -provider name
43 -provider-path path
44 -propquery propq
45 See "Provider Options" in openssl(1), provider(7), and property(7).
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48 openssl(1), RAND_bytes(3), RAND(7), EVP_RAND(7)
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51 The -engine option was deprecated in OpenSSL 3.0.
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54 Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
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56 Licensed under the Apache License 2.0 (the "License"). You may not use
57 this file except in compliance with the License. You can obtain a copy
58 in the file LICENSE in the source distribution or at
59 <https://www.openssl.org/source/license.html>.
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633.0.9 2023-07-27 OPENSSL-RAND(1ossl)