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Skip32 php implementation - 32-bit block cipher based on Skipjack
This project forked from nlenepveu/skip32
Skip32 php implementation - 32-bit block cipher based on Skipjack
Skip32 php implementation ========================= 32-bit block cipher based on Skipjack This cipher can be handy for scrambling small (32-bit) values when you would like to obscure them while keeping the encrypted output size small (also only 32 bits). Skip32.php ---------- Simple API to encrypt/decrypt values using the Skip32 cipher Example : $key = '0123456789abcdef0123'; // 10 bytes key $int = 4294967295; // 4 bytes integer $encrypted = Skip32::encrypt($key, $int); $decrypted = Skip32::decrypt($key, $encrypted); printf("%d encrypted to %d\n", $int, $encrypted); printf("%d decrypted to %d\n", $encrypted, $decrypted); This will display (on 64-bit architecture) : 4294967295 encrypted to 572455217 572455217 decrypted to 4294967295 Skip32Cipher.php ---------------- Adaptation of a direct Perl translation of the SKIP32 C implementation http://search.cpan.org/~esh/Crypt-Skip32/lib/Crypt/Skip32.pm http://www.qualcomm.com.au/PublicationsDocs/skip32.c Example : $key = pack('H20', '0123456789abcdef0123'); // 10 bytes key $cipher = new Skip32Cipher($key); $int = 4294967295; // 4 bytes integer $bin = pack('N', $int); $encrypted = $cipher->encrypt($bin); list(, $encryptedInt) = unpack('N', $encrypted); printf("%d encrypted to %d\n", $int, $encryptedInt); $bin = pack('N', $encryptedInt); $decrypted = $cipher->decrypt($bin); list(, $decryptedInt) = unpack('N', $decrypted); printf("%d decrypted to %d\n", $encryptedInt, $decryptedInt); This will display (on 64-bit architecture) : 4294967295 encrypted to 572455217 572455217 decrypted to 4294967295 Performed by Nicolas Lenepveu <[email protected]>
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