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This commit is based on the s390-tools-1.39.0 version. Changes on top of s390-tools-1.39.0: - Add MIT license to all source files - Add LICENSE file - Transform REAMDE to README.md (markdown) - Add AUTHORS.md file - Add CONTRIBUTING.md file - Move changelog from README to CHANGELOG.md file Reviewed-by: Stefan Haberland <sth@linux.vnet.ibm.com> Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
38 lines
1.4 KiB
Groff
38 lines
1.4 KiB
Groff
.\" Copyright IBM Corp. 2007, 2017
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.\" s390-tools is free software; you can redistribute it and/or modify
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.\" it under the terms of the MIT license. See LICENSE for details.
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.\"
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.TH PRANDOM 4 "Jan 2007" "s390-tools"
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.SH NAME
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prandom \- kernel pseudo random number generator device for s390
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.SH DESCRIPTION
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The character special file \fI/dev/prandom\fP provides an interface to the
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pseudo random number generator. The s390 pseudo random number generator uses
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the hardware accelerated cryptographic assist functions which are integrated
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in the CPU. \fI/dev/prandom\fP is available starting with the z9 processor.
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.LP
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Reading from \fI/dev/prandom\fP is non-blocking. Any amount of data could
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be read from the device.
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.LP
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The s390 pseudo random number generator provides cryptographically secure
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pseudo random numbers following the algorithm in ANSI X9.17. Entropy is added
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periodically to the generator to protect against a compromised key.
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.LP
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.SH CONFIGURATION
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The \fI/dev/prandom\fP device node is generated by udev while loading the corresponding kernel
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module or while booting a kernel with the generator built-in. By default
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\fI/dev/prandom\fP is readable only by root. If it should be readable by every user
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add the following to /etc/rules.d/50-udev.rules:
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.nf
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KERNEL=="prandom", MODE="0444", OPTIONS="last_rule"
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.fi
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.SH FILES
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/dev/prandom
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.SH SEE ALSO
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Linux on zSeries: Device Drivers, Features and Commands
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