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Informations about the package skip32

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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