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Plan 9 - man page for encrypt (plan9 section 2)

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ENCRYPT(2)									       ENCRYPT(2)

       encrypt, decrypt, netcrypt - DES encryption

       #include <u.h>
       #include <libc.h>

       int  encrypt(void *key, void *data, int len)

       int  decrypt(void *key, void *data, int len)

       int  netcrypt(void *key, void *data)

       Encrypt	and  decrypt perform DES encryption and decryption.  Key is an array of DESKEYLEN
       (defined as 7 in <auth.h>) bytes containing the encryption key.	Data is an array  of  len
       bytes; it must be at least 8 bytes long.  The bytes are encrypted or decrypted in place.

       The DES algorithm encrypts an individual 8 byte block of data.  Encrypt uses the following
       method to encrypt data longer than 8 bytes.  The first 8 bytes  are  encrypted  as  usual.
       The  last byte of the encrypted result is prefixed to the next 7 unencrypted bytes to make
       the next 8 bytes to encrypt.  This is repeated until  fewer  than  7  bytes  remain  unen-
       crypted.   Any  remaining  unencrypted  bytes  are  encrypted with enough of the preceding
       encrypted bytes to make a full 8 byte block.  Decrypt uses the inverse algorithm.

       Netcrypt performs the same encryption as a SecureNet Key.  Data points to an ASCII  string
       of decimal digits with numeric value between 0 and 10000.  These digits are copied into an
       8 byte buffer with trailing binary zero fill and encrypted as one DES  block.   The  first
       four  bytes  are  each formatted as two digit ASCII hexadecimal numbers, and the string is
       copied into data.


       These routines return 1 if the data was encrypted, and 0 if the encryption fails.  Encrypt
       and decrypt fail if the data passed is less than 8 bytes long.  Netcrypt can fail if it is
       passed invalid data.


       The source is not included in public distributions.  The implementation is broken in a way
       that makes it unsuitable for anything but authentication.

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