The random bytes are generated using the RAND_bytes(3) function, which provides a security level of 256 bits, provided it managed to seed itself successfully from a trusted operating system entropy source. Otherwise, the command will fail with a nonzero error code. For more details, see RAND_bytes(3), RAND(7), and RAND_DRBG(7).
- Print out a usage message.
- -out file
- Write to file instead of standard output.
- -rand file...
- A file or files containing random data used to seed the random number generator. Multiple files can be specified separated by an OS-dependent character. The separator is ; for MS-Windows, , for OpenVMS, and : for all others. Explicitly specifying a seed file is in general not necessary, see the "NOTES" section for more information.
- [-writerand file]
- Writes random data to the specified file upon exit. This can be used with a subsequent -rand flag.
- Perform base64 encoding on the output.
- Show the output as a hex string.
It is generally an error to use the same seed file more than once and every use of -rand should be paired with -writerand.
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