The two data blocks are from this site,but failed to produce the collision :
var_dump(md5('d131dd02c5e6eec4693d9a0698aff95c2fcab58712467eab4004583eb8fb7f8955ad340609f4b30283e488832571415a085125e8f7cdc99fd91dbdf280373c5bd8823e3156348f5bae6dacd436c919c6dd53e2b487da03fd02396306d248cda0e99f33420f577ee8ce54b67080a80d1ec69821bcb6a8839396f9652b6ff72a70') == md5('d131dd02c5e6eec4693d9a0698aff95c2fcab50712467eab4004583eb8fb7f8955ad340609f4b30283e4888325f1415a085125e8f7cdc99fd91dbd7280373c5bd8823e3156348f5bae6dacd436c919c6dd53e23487da03fd02396306d248cda0e99f33420f577ee8ce54b67080280d1ec69821bcb6a8839396f965ab6ff72a70'));
Which output a bool(false),is there something I did wrongly?
EDIT Best with a demo?
You are calculating the md5 hash of the ASCII text. You will need to convert the ASCII hex representation to actual binary bytes, then run md5 on the blocks.
try this one (according to this paper):
<?php
$a = md5("\xA6\x64\xEA\xB8\x89\x04\xC2\xAC\x48\x43\x41\x0E\x0A\x63\x42\x54\x16\x60\x6C\x81\x44\x2D\xD6\x8D\x40\x04\x58\x3E\xB8\xFB\x7F\x89\x55\xAD\x34\x06\x09\xF4\xB3\x02\x83\xE4\x88\x83\x25\x71\x41\x5A\x08\x51\x25\xE8\xF7\xCD\xC9\x9F\xD9\x1D\xBD\xF2\x80\x37\x3C\x5B\x97\x9E\xBD\xB4\x0E\x2A\x6E\x17\xA6\x23\x57\x24\xD1\xDF\x41\xB4\x46\x73\xF9\x96\xF1\x62\x4A\xDD\x10\x29\x31\x67\xD0\x09\xB1\x8F\x75\xA7\x7F\x79\x30\xD9\x5C\xEB\x02\xE8\xAD\xBA\x7A\xC8\x55\x5C\xED\x74\xCA\xDD\x5F\xC9\x93\x6D\xB1\x9B\x4A\xD8\x35\xCC\x67\xE3");
$b = md5("\xA6\x64\xEA\xB8\x89\x04\xC2\xAC\x48\x43\x41\x0E\x0A\x63\x42\x54\x16\x60\x6C\x01\x44\x2D\xD6\x8D\x40\x04\x58\x3E\xB8\xFB\x7F\x89\x55\xAD\x34\x06\x09\xF4\xB3\x02\x83\xE4\x88\x83\x25\xF1\x41\x5A\x08\x51\x25\xE8\xF7\xCD\xC9\x9F\xD9\x1D\xBD\x72\x80\x37\x3C\x5B\x97\x9E\xBD\xB4\x0E\x2A\x6E\x17\xA6\x23\x57\x24\xD1\xDF\x41\xB4\x46\x73\xF9\x16\xF1\x62\x4A\xDD\x10\x29\x31\x67\xD0\x09\xB1\x8F\x75\xA7\x7F\x79\x30\xD9\x5C\xEB\x02\xE8\xAD\xBA\x7A\x48\x55\x5C\xED\x74\xCA\xDD\x5F\xC9\x93\x6D\xB1\x9B\x4A\x58\x35\xCC\x67\xE3");
//--------------------------------------------------------------------------------------!---------------------------------------------------------------------------------------------------!---!-------------------------------------------------------!-----------------------------------------------------------------------------------------------!-------------------------------------------------------------------------------------------------------!-------------------------------------------------------!------------------
var_dump($a === $b);
I have placed exclamation marks where both strings differ.
I ask the same question.
The string contains hex values. You can convert them by using hex2bin("d131d...") or for PHP < 5.4.0 pack("H*", "d131d..."):
echo md5(hex2bin("d131dd02c5e6eec4693d9a0698aff95c2fcab58712467eab4004583eb8fb7f8955ad340609f4b30283e488832571415a085125e8f7cdc99fd91dbdf280373c5bd8823e3156348f5bae6dacd436c919c6dd53e2b487da03fd02396306d248cda0e99f33420f577ee8ce54b67080a80d1ec69821bcb6a8839396f9652b6ff72a70"));
or
echo md5(pack("H*", "d131dd02c5e6eec4693d9a0698aff95c2fcab58712467eab4004583eb8fb7f8955ad340609f4b30283e488832571415a085125e8f7cdc99fd91dbdf280373c5bd8823e3156348f5bae6dacd436c919c6dd53e2b487da03fd02396306d248cda0e99f33420f577ee8ce54b67080a80d1ec69821bcb6a8839396f9652b6ff72a70");