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shishi_decrypt_iv(3)		    shishi		  shishi_decrypt_iv(3)

NAME
       shishi_decrypt_iv - API function

SYNOPSIS
       #include	<shishi.h>

       int  shishi_decrypt_iv(Shishi * handle, Shishi_key * key, int keyusage,
       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.

       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  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 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_iv(3)

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

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