Random number generator (device): Difference between revisions
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=== |
==={{libheader|BSD libc}}=== |
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[http://www.openbsd.org/cgi-bin/man.cgi?query=arc4random&apropos=0&sektion=3&manpath=OpenBSD+Current&arch=i386&format=html arc4random()] appeared in [[OpenBSD]] 2.1 and has spread to many [[BSD]] systems. This function runs an ARC4 random number generator that takes entropy from a kernel device. (This kernel device is sysctl kern.arandom in OpenBSD, or /dev/urandom in some other systems.) |
[http://www.openbsd.org/cgi-bin/man.cgi?query=arc4random&apropos=0&sektion=3&manpath=OpenBSD+Current&arch=i386&format=html arc4random()] appeared in [[OpenBSD]] 2.1 and has spread to many [[BSD]] systems. This function runs an ARC4 random number generator that takes entropy from a kernel device. (This kernel device is sysctl kern.arandom in OpenBSD, or /dev/urandom in some other systems.) |
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==={{libheader|OpenSSL}}=== |
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OpenSSL can generate random numbers. The default generator uses SHA1. For [[Unix]] systems, OpenSSL will gather entropy by reading a kernel device like /dev/urandom, or by using [http://egd.sourceforge.net/ EGD, the Entropy Gathering Daemon]. For other systems, OpenSSL might use a different source of entropy. |
OpenSSL can generate random numbers. The default generator uses SHA1. For [[Unix]] systems, OpenSSL will gather entropy by reading a kernel device like /dev/urandom, or by using [http://egd.sourceforge.net/ EGD, the Entropy Gathering Daemon]. For other systems, OpenSSL might use a different source of entropy. |
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=={{header|C++}}== |
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<code>std::random_device</code> is a uniformly-distributed integer random number generator that produces non-deterministic random numbers. |
<code>std::random_device</code> is a uniformly-distributed integer random number generator that produces non-deterministic random numbers. |
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== |
=={{header|ChucK}}== |
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<lang c> Math.random2(-(Math.random()),Math.random(); </lang> |
<lang c> Math.random2(-(Math.random()),Math.random(); </lang> |
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