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NAME

       shishi_decrypt_iv_etype - API function

SYNOPSIS

       #include <shishi.h>

       int  shishi_decrypt_iv_etype(Shishi  *  handle,  Shishi_key  * key, int
       keyusage, int32_t etype, const char * iv, size_t ivlen,  const  char  *
       in, size_t inlen, char ** out, size_t * outlen);

ARGUMENTS

       Shishi * handle
                   shishi handle as allocated by shishi_init().

       Shishi_key * key
                   key to decrypt with.

       int keyusage
                   integer specifying what this key is decrypting.

       int32_t etype
                   integer specifying what cipher to use.

       const char * iv
                   input array with initialization vector

       size_t ivlen
                   size of input array with initialization vector.

       const char * in
                   input array with data to decrypt.

       size_t inlen
                   size of input array with data to decrypt.

       char ** out output array with newly allocated decrypted data.

       size_t * outlen
                   output  variable with size of newly allocated output array.

DESCRIPTION

       Decrypts data as per encryption method using  specified  initialization
       vector  and key.  The key actually used is derived using the key usage.
       If key usage is 0, no key derivation is used.  The OUT buffer  must  be
       deallocated    by   the   caller.    The   next   IV   is   lost,   see
       shishi_decrypt_ivupdate_etype if you need it.

       Note  that  DECRYPT(ENCRYPT(data))  does  not  necessarily  yield  data
       exactly.   Some  encryption types add pad to make the data fit into the
       block size of the encryption algorithm.  Furthermore, the  pad  is  not
       guaranteed   to   look   in   any   special   way,   although  existing
       implementations often pad with the zero byte.  This means that you  may
       have  to  "frame"  data, so it is possible to infer the original length
       after decryption.  Compare ASN.1 DER which contains such information.

RETURN VALUE

       Returns SHISHI_OK iff successful.

REPORTING BUGS

       Report bugs to <bug-shishi@gnu.org>.

COPYRIGHT

       Copyright © 2002-2010 Simon Josefsson.
       Copying and distribution of this file, with  or  without  modification,
       are  permitted  in  any  medium  without royalty provided the copyright
       notice and this notice are preserved.

SEE ALSO

       The full documentation for shishi is maintained as  a  Texinfo  manual.
       If  the  info  and shishi programs are properly installed at your site,
       the command

              info shishi

       should give you access to the complete manual.