Hi,
Tuesday, January 6, 2004, 8:48:17 PM, you wrote:
GCN> I am trying to figure out how to encrypt data using the web-based php
GCN> mcrypt function and then decrypt it using the command line (cli) mcrypt
GCN> binary, and vica-versa.
GCN> I cannot seem to get the same encrypted output for the same data,
GCN> between the two methods. I've tried to ensure I am using the same
GCN> algorithms and modes for both methods by testing the mcrypt_enc_get_*
GCN> functions. I think the problem may lie in the way both methods are
GCN> being seeded.
GCN> Web-Based PHP Example:
GCN> $key = 'test';
GCN> $data[] = 'abcdefghijklmnopqrstuvwxyz';
GCN> $m = 0;
GCN> foreach ($data as $dt)
GCN> {
GCN> $td = mcrypt_module_open('tripledes', '', 'ecb', '');
GCN> $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
GCN> mcrypt_generic_init($td, $key, $iv);
GCN> $CRYPT[$m] = mcrypt_generic($td, $dt);
GCN> /*
GCN> echo mcrypt_enc_get_algorithms_name($td);
GCN> echo mcrypt_enc_get_block_size($td);
GCN> echo mcrypt_enc_get_iv_size($td);
GCN> echo mcrypt_enc_get_key_size($td);
GCN> echo mcrypt_enc_get_modes_name($td);
GCN> echo mcrypt_enc_get_supported_key_sizes($td);
GCN> echo mcrypt_enc_is_block_algorithm_mode($td);
GCN> echo mcrypt_enc_is_block_algorithm($td);
GCN> echo mcrypt_enc_is_block_mode($td);
GCN> echo mcrypt_enc_self_test($td);
GCN> */
GCN> $DECRYPT[$m] = mdecrypt_generic($td, $dt);
GCN> mcrypt_generic_deinit($td);
GCN> mcrypt_module_close($td);
GCN> echo "crypt_" . base64_encode($CRYPT[$m]) . "_<br />\n";
GCN> echo "decrypt_" . base64_decode(rtrim($DECRYPT[$m])) . "_<br />\n";
GCN> $m++;
GCN> }
GCN> Note: I believe it is the line where the $iv variable is being set that
GCN> is causing the issue and/or I cannot reproduce the same seeding using
GCN> the command line options.
GCN> Command Line Example:
GCN> echo "abcdefghijklmnopqrstuvwxyz" | mcrypt -Fb -m ecb -a tripledes |
GCN> encode-base64
GCN> echo "" | decode-base64 | mcrypt -dFb -m ecb -a tripledes
GCN> I would appreciate any comments or suggestions.
GCN> Respectfully,
GCN> Gary
try setting the iv to all 0's
$iv = 0;
$iv = pack("a".mcrypt_enc_get_iv_size($td),$iv);
--
regards,
Tom
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