https://bugzilla.wikimedia.org/show_bug.cgi?id=35894

--- Comment #5 from Sam Reed (reedy) <[email protected]> 2012-04-12 13:36:35 
UTC ---
Doing the simplest of possible tests on PHP 5.3.10:

C:\Users\Reedy\Desktop>e:\php\php.exe CryptRand.php
CryptRand::realGenerate: Generating cryptographic random bytes
CryptRand::realGenerate: mcrypt_create_iv generated 2048 bytes of randomness.
CryptRand::realGenerate: 0 bytes of randomness leftover in the buffer.
4c531f0706c381e2a35a09cde42a59657d4f095fd3b84d921fc899cd96a38c8672c99a5d2b97469af7b248c2f10478bcc13d
32b46ca548ccdcea1daf8ad5035ae9231fbec2bacd389660126563252e99e48af34bae0b26a1aed5305f1ef0df037696cfab
c0136813b114e3e9269b1c3db745ea9d913dc6d9cba92ce862e7665ae87c5d8899559a4a5379bddd4f26edd7ee399a54b468
cd292a654c7fc0b0f6e51f302ad8162f6282c2a25ac6fe3d84ad9234c9d400c69b273d88e9f3747a47b73e02e485789c3968
0409a4763408ac8a8f9ae985398b74417ad01f8beda762ca83eb49d3edb6c65263fe359b89ff61f0ddab5c91fa6a7e396aed
553f0c33756193dae4cfca5bf5149fad3578dafba85cc8031852b75cea97b26793f5818371c61beea90798105e7c227a9859
6210a8b6f28144efe0a5acfc689115b5091f738aa83403c43df0cce1dca1dbc008d3bd2cefb94132a40801657ce4e3f70841
a4028debf3c78c63586820fce6dadf33d1540f7ffbdd0661bc7a5903e7d0761593390587e83f9b7f6d6e581e1cf210c9797f
f4a046cd15db127b96887d4f44254eb0fbd73bee88b5021ea7cf1aee4337ad83a162015f73033fa3ddbdd76ea75760b4d208
94f8db44e05353f0615f2db9304863e4064057392086b778f8ab636f639b61a46d46879cb14e476a6b496874e7fc297c2186
ca76a1d64b88cf77f8345f33ef8deff97bdbd931553acf542a2b1a6aedd99307cd00572be21bceb8577e1fc6eb488b1bd2ad
dc332a9f655cfb2836d71c20bcb2f57e4fa115ebefbca4a09c41e5cfdd473d97ba0561c306a00ed586e43426b71818f49740
22d223601ea5b8fc6d0c3a97f3a34bc8b3b0133808456a8dd548b44d4153e5e48f33f0152bd1edb575b51d1f66d40d568c51
763686a0ac2a078c45f296f0a39f6b1a77b0c0e3a6a4c38596255a88708c27923cdc05b142e7e1f9dd75c23ca855ee588c95
0afbffca1b41be923614fe3e30c3d40ec7c902b9416d8b8a875b510f09cffc22463ad3f0a99953d2733f92a44c37393c70d7
93102e7d4a7aefa04af784dc900ee5653acb787b953810e4dbc58e45bcbd4e6d8fb9784800ac92e14a32965ffc0e5df473cb
c0d4642fa19f0323fe35e4f079611f12539fb307402172b232b076e721853a037b0e45e122a238766ad8ba2bba96fab5cf03
34e5a01b2be6c4107639e0f1e50c2ef5367b0bc58f523b7f0ce4a90430de5aefdfef9d795c0679c92309912da4d0cdf15283
4cb7e9f7f704b3066c659257a0139b4dadf3f1bc568105f2085aa5162a5183eb3d6239e74c7dc21687595962b66b900f97a5
c5a799e13ae0c2a58552fd0c901352bf851c4c8318f19efcd8b49cd8a1d5000fcf3d3f958454f9728e208c9fd034d2181364
4a20762d1a8bb87d0d13dc03883081efa7c9ce588efd16655fc1cebfcc3cbcf2d91bc94bf04d1c1c958e3403c21dbb6f460c
1a3a1f8e914fd439e5bef0075d9b2f5f61fe399ada2ef7cda42d73c6d3dca335bcee4d9190f75b1b2b86e74423c4b7768a8e
797c568989353b15649c00bf4a861c20024fa84ac5d1d5efc7e14719d76c4e281e1e93cc536ef554481ac9cae4396fab4c94
4ddca6713fcf9b17d9507ec688d0d6651f781e9f77aa27ac2e945e5f39b92da28f56913e6361c13cd1d2a028157049318f2e
bb4490387c60595c8feb19c2e77c22726ec09e945229d6cceba4db1ae16bd651bc777b58a9d55d4ac5e488d42eea31ea731b
ce99e03abffe8aec5056d20c507040a82c01e07fab350632a4853bcc3a78bcb9ff3fc3f136ef65174658359f81b91b4ef56e
44bfc64af98999f03934af420f0205d328cfeb7172ec02ffe24c508a629e13bf4758ae6fe36f3fc0d95aa29ad29da7d42eb3
8832e4943427414b3d494e4d3045dcedf02f1ce25361cd9dc8772a5202fce0dd456ab521a161209898a3be1974f5092d6e36
907db813ec7f46eedf0ac4e83357a9955b8a3ec0b90568ed23a75906f49170e6ce32c08332fa53b5a892d0f27693ce6e9eb1
171bee3e5affce8cd8c9032af41398ce1e5cd69d1fecd0f513a1b3e171dba3e384544e191d3efa1b29ec681a8eef0bc71917
350feb93bb7b9423b66dda9e2426dacecd12cdfdfe22375b26deb870945f1750a2c45299c26d4a45165c276c9b00d58ba4b3
86bea197872d94713b972731cc81f1eff5d8d3646eb9e5de0d7c19beb9077dbdfd8288a3e6902047bb73b6ef20d62911eb28
b4e0b24c1b2927dc2715d4b12561d0c556a5389e60f585406febfd3d8ef03f9502df4cf311c81c251d4d8f1fda4a5777057b
7d2ff45f577010df0dda4e068776f7a06ec29aed4a823fd7f3fbc15bacf86cc76b74da50a2ed933d53960f7a1577d669477a
10cc23dab3e338c4491cbd5c5a92f4bafd59ec6611c08dfcebd4c4d95537b2f212e1893d9210a30757381808db6d4ca6c10a
5576ca921b7f020d8bcc35dd6e9b8aef4e0da43c100b0b579fcc4eb153b9b1f3005b371b1c00b192188b9a1f1e0c46dc9627
1b208fa591005d45692617f1de92f46b403761da9f967c1818f3ed2dcab9dfb5b27b9bf3366cfc417c707b33d18b6deb6f9d
0e58b5eaa124256687ecf8d3690ea8764110f0b323606f2056fccb29c66ee973414a65473bc1fed69c6ef125006181fda2a0
fe514d2521d849f2384cb5dbb54a2f1a68fd05a9e479d8ac5d045645458ad93d9ce39b2d33c8918f540497ebb8de312fa5de
f447fc2d33c98999ea97c47a918a751aa32b1ddd907ba6d72bcd8a2bcca1bb6e0ca77abbfd584242354235d651cd2f9db4ba
2651a6dd608c2fde901f5687ecaf9ab73f2e589973fbbb6a6d2e8a0484aa484e35344c726709d7768abb8f2d250558f2
C:\Users\Reedy\Desktop>



echo CryptRand::generateHex( 2147483647 );

C:\Users\Reedy\Desktop>e:\php\php.exe CryptRand.php
CryptRand::realGenerate: Generating cryptographic random bytes
PHP Fatal error:  Allowed memory size of 134217728 bytes exhausted (tried to
allocate 1073741825 byt
es) in C:\Users\Reedy\Desktop\CryptRand.php on line 302

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to
allocate 1073741825 bytes) i
n C:\Users\Reedy\Desktop\CryptRand.php on line 302


Using silly large numbers

C:\Users\Reedy\Desktop>e:\php\php.exe CryptRand.php
CryptRand::realGenerate: Generating cryptographic random bytes
PHP Warning:  mcrypt_create_iv(): Cannot create an IV with a size of less than
1 or greater than 214
7483647 in C:\Users\Reedy\Desktop\CryptRand.php on line 302

Warning: mcrypt_create_iv(): Cannot create an IV with a size of less than 1 or
greater than 21474836
47 in C:\Users\Reedy\Desktop\CryptRand.php on line 302
CryptRand::realGenerate: mcrypt_create_iv returned false.
CryptRand::realGenerate: /dev/urandom could not be opened.
CryptRand::realGenerate: Falling back to using a pseudo random state to
generate randomness.
CryptRand::hashAlgo: Using the whirlpool hash algorithm.
CryptRand::driftHash: Clock drift calculation (time-taken=32.00101852417ms,
iterations=36539, time-p
er-iteration=0.87580444249076us)
CryptRand::driftHash: Clock drift calculation (time-taken=32.000780105591ms,
iterations=43135, time-
per-iteration=0.7418750459161us)

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