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shishi_decrypt_ivupdate_etype(3)    shishi    shishi_decrypt_ivupdate_etype(3)

NAME
       shishi_decrypt_ivupdate_etype - API function

SYNOPSIS
       #include	<shishi.h>

       int  shishi_decrypt_ivupdate_etype(Shishi  *  handle, Shishi_key	* key,
       int keyusage, int32_t etype, const char * iv,  size_t  ivlen,  char  **
       ivout,  size_t  * ivoutlen, 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.

       char ** ivout
		   output array	with newly  allocated  updated	initialization
		   vector.

       size_t *	ivoutlen
		   size	of output array	with updated 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.  If IVOUT or IVOUTLEN	is NULL,  the  updated
       IV is not saved anywhere.

       Note  that  DECRYPT(ENCRYPT(data))  does	not necessarily	yield data ex-
       actly.  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  implementa-
       tions  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  de-
       cryption.  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 (C) 2002-2010 Simon Josefsson.
       Copying	and  distribution  of this file, with or without modification,
       are permitted in	any medium without royalty provided the	copyright  no-
       tice 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.

shishi				     1.0.2    shishi_decrypt_ivupdate_etype(3)

NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | RETURN VALUE | REPORTING BUGS | COPYRIGHT | SEE ALSO

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