Ask for less random data in mcrypt_create_iv

Otherwise the RNG blocks and the test takes a lot of time to run (and
occasionally fails).

Author: nikic

ext/mcrypt/tests/mcrypt_create_iv.phpt

@@ -5,13 +5,13 @@ mcrypt_create_iv
 --FILE--
 <?php
 $iv1 = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB), MCRYPT_RAND);
-$iv2 = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_192, MCRYPT_MODE_ECB), MCRYPT_DEV_URANDOM);
-$iv3 = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_DEV_RANDOM);
+$iv2 = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB), MCRYPT_DEV_URANDOM);
+$iv3 = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB), MCRYPT_DEV_RANDOM);
 
 echo strlen($iv1) . "\n";
 echo strlen($iv2) . "\n";
 echo strlen($iv3) . "\n";
 --EXPECT--
 16
-24
-32
+16
+16