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<?php function insecureEncryptDoNotUse(string $plaintext, string $key): string { return \openssl_encrypt( $plaintext, 'aes-128-ctr', $key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING, str_repeat("\x00", 16) ); } function insecureDecryptDoNotUse(string $ciphertext, string $key): string { return \openssl_decrypt( $ciphertext, 'aes-128-ctr', $key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING, str_repeat("\x00", 16) ); } $key = str_repeat("3.14", 4); $ciphertextA = insecureEncryptDoNotUse('0000000000000001', $key); $xor = str_repeat("\x00", mb_strlen($ciphertextA, '8bit') - 1) . "\x40"; $ciphertextB = $ciphertextA ^ $xor; var_dump(insecureDecryptDoNotUse($ciphertextB, $key));
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.15, 8.4.1 - 8.4.2
Fatal error: Uncaught Error: Call to undefined function openssl_encrypt() in /in/8e4J0:6 Stack trace: #0 /in/8e4J0(28): insecureEncryptDoNotUse('000000000000000...', '3.143.143.143.1...') #1 {main} thrown in /in/8e4J0 on line 6
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected ':', expecting '{' in /in/8e4J0 on line 4
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected ':', expecting '{' in /in/8e4J0 on line 4
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting ')' in /in/8e4J0 on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting ')' in /in/8e4J0 on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/8e4J0 on line 4
Process exited with code 255.

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