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<?php $plaintext = "\x04\x03\x02\x01\x00\x00\x00"; $ciphertext = mcrypt_encrypt( MCRYPT_RIJNDAEL_128, "YELLOW SUBMARINE", $plaintext, MCRYPT_MODE_ECB ); $decrypted = trim( mcrypt_decrypt( MCRYPT_RIJNDAEL_128, "YELLOW SUBMARINE", $ciphertext, MCRYPT_MODE_ECB ) ); var_dump([ bin2hex($plaintext), bin2hex($decrypted) ]); var_dump([ mb_strlen($plaintext, '8bit'), mb_strlen($decrypted, '8bit') ]);