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-.TH ENCRYPT 3
-.SH NAME
-encrypt, decrypt, netcrypt \- DES encryption
-.SH SYNOPSIS
-.B #include <u.h>
-.br
-.B #include <libc.h>
-.PP
-.B
-int	encrypt(void *key, void *data, int len)
-.PP
-.B
-int	decrypt(void *key, void *data, int len)
-.PP
-.B
-int	netcrypt(void *key, void *data)
-.SH DESCRIPTION
-.I Encrypt
-and
-.I decrypt
-perform DES encryption and decryption.
-.I Key
-is an array of
-.B DESKEYLEN
-(defined as 7 in
-.BR <auth.h> )
-bytes containing the encryption key.
-.I Data
-is an array of
-.I len
-bytes;
-it must be at least 8 bytes long.
-The bytes are encrypted or decrypted in place.
-.PP
-The DES algorithm encrypts an individual 8-byte block of data.
-.I 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 unencrypted.
-Any remaining unencrypted bytes are encrypted with enough of the preceding
-encrypted bytes to make a full 8-byte block.
-.I Decrypt
-uses the inverse algorithm.
-.PP
-.I Netcrypt
-performs the same encryption as a SecureNet Key.
-.I Data
-points to an
-.SM 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
-.SM ASCII
-hexadecimal numbers,
-and the string is copied into
-.IR data .
-.SH SOURCE
-.B /usr/local/plan9/src/libc/port
-.SH DIAGNOSTICS
-These routines return 1 if the data was encrypted,
-and 0 if the encryption fails.
-.I Encrypt
-and
-.I decrypt
-fail if the data passed is less than 8 bytes long.
-.I Netcrypt
-can fail if it is passed invalid data.
-.SH SEE ALSO
-.IR securenet (8)
-.SH BUGS
-The implementation is broken in a way that makes
-it unsuitable for anything but authentication.