---
name: "shishi_checksum"
section: "3"
platform: "linux"
package: "shishi-doc"
version: "1.0.3-5"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/shishi_checksum"
---

# shishi\_checksum(3)

API function

## NAME

shishi\_checksum - API function

## SYNOPSIS

**#include \<shishi.h\>**

**int shishi\_checksum(Shishi \*** *handle***, Shishi\_key \*** *key***, int** *keyusage***, int** *cksumtype***, 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 compute checksum with.

- int keyusage

  integer specifying what this key is used for.

- int cksumtype

  the checksum algorithm to use.

- const char \* in

  input array with data to integrity protect.

- size\_t inlen

  size of input array with data to integrity protect.

- char \*\* out

  output array with newly allocated integrity protected data.

- size\_t \* outlen

  output variable with length of output array with checksum.

## DESCRIPTION

Integrity protect data using key, possibly altered by supplied key usage.  If key usage is 0, no key derivation is used.  The OUT buffer must be deallocated by the caller.

## RETURN VALUE

Returns **SHISHI\_OK** iff successful.

## REPORTING BUGS

Report bugs to \<bug-shishi@gnu.org\>. GNU Shishi home page: http://www.gnu.org/software/shishi/ General help using GNU software: http://www.gnu.org/gethelp/

## COPYRIGHT

Copyright © 2002-2022 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.