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NAME
     skidecrypt - decrypt file

SYNOPSIS
     skidecrypt [-s | -v] [-c cipher_file] [-i input_file]
     [-o output_file]

AVAILABILITY
     SUNWski

DESCRIPTION
     The skidecrypt utility decrypts data that was  encrypted  by
     an encryption utility such as skiencrypt(1).

     skidecrypt reads input from input_file and  produces  clear-
     text  data  which is stored in output_file. If no input_file
     is provided, the input  data  is  read  from  stdin.  If  no
     output_file  is  given,  the  cleartext  data  is printed to
     stdout.

     The data provided in input_file must be formatted as a  PKCS
     #7  message,  and must be provided in the printable encoding
     format as defined in the Internet RFC1421 standard.

     If the PKCS #7 input has content type "enveloped-data",  the
     content-encryption key under which the data was encrypted is
     recovered using the user's private key.  The  ciphertext  is
     then  decrypted  using  the recovered content-encryption key
     and the appropriate decryption algorithm.

     If the content type of the  PKCS  #7  input  is  "encrypted-
     data",  the  user is prompted for a password, from which the
     content-encryption key is derived. The  ciphertext  is  then
     decrypted  using the derived content- encryption key and the
     appropriate (password-based) decryption algorithm.  The only
     supported    password-based    decryption   algorithms   are
     pbeWithMD2AndDES-CBC and pbeWithMD5AndDES-CBC, as defined in
     the PKCS #5 standard.

     If the skiencrypt -x option was  used  when  encrypting  the
     data  (see  skiencrypt(1)),  the data provided in input_file
     will not contain the ciphertext. In this  case,  a  separate
     file,  cipher_file,  containing  the  ciphertext may be pro-
     vided.  If cipher_file is not provided,  skidecrypt  assumes
     the ciphertext is stored in a file named by input_file, suf-
     fixed by ".cipherdata".  If the  input  data  is  read  from
     stdin  (no  input_file  is provided) then skidecrypt assumes
     the ciphertext is stored in a file named "cipherdata" in the
     current  working  directory. The ciphertext must be provided
     in printable (ASCII) encoding.


     skidecrypt requires that the user has registered his or  her
     private key with the SKI keyserver (see skilogin(1)), unless
     password-based decryption is being used.

OPTIONS
     The following options are supported:

     -s      Run application silently (no status or error  infor-
             mation displayed).

     -v      Give verbose output.  If both  the  -v  and  the  -s
             options are specified, the -v option is ignored.

     -c cipher_file
             File containing the  ciphertext  (only  required  if
             ciphertext  is not included in input_file). Defaults
             to  input_file,  suffixed   by   ".cipherdata",   if
             input_file is provided,  or to a file named "cipher-
             data" in the current working directory if input data
             is  read  from  stdin ( input_file is not provided).
             The ciphertext must be provided in printable (ASCII)
             encoding,  as  defined by the Internet RFC1421 stan-
             dard.

     -i input_file
             File containing the decryption information (that is,
             the  decryption mechanism and optionally the decryp-
             tion key) and optionally the ciphertext.

     -o output_file
             File where cleartext data is stored.

EXAMPLES
     This example decrypts the file "encrypted"  (which  contains
     the ciphertext and the decryption key/algorithm), and stores
     the recovered cleartext in the file "cleartxt":

          example% skidecrypt -i encrypted -o cleartxt

     The following example obtains the  decryption  key/algorithm
     from  the file "decrinfo", decrypts the ciphertext stored in
     "ciphertxt",  and  stores   the   recovered   cleartext   in
     "cleartxt":

          example%  skidecrypt  -i  decrinfo  -c   ciphertxt   -o
          cleartxt

     In the following example, the file "decrinfo" only  contains
     the  decryption key/algorithm information.  skidecrypt reads
     this information from stdin and by default assumes that  the
     ciphertext  is  stored  in  a file named "cipherdata" in the
     current working directory.  The ciphertext from "cipherdata"
     is decrypted and the cleartext is stored in "cleartxt":

          example% skidecrypt -o cleartxt < decrinfo

EXIT STATUS
     The skidecrypt command exits with 0 if successful and 1 oth-
     erwise.

SEE ALSO
     skiencrypt(1), skisign(1), skiverify(1), skilogin(1)

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