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krb5_c_make_checksum - Compute a checksum (operates on keyblock).
===================================================================
..
.. c:function:: krb5_error_code krb5_c_make_checksum(krb5_context context, krb5_cksumtype cksumtype, const krb5_keyblock * key, krb5_keyusage usage, const krb5_data * input, krb5_checksum * cksum)
..
:param:
**[in]** **context** - Library context
**[in]** **cksumtype** - Checksum type (0 for mandatory type)
**[in]** **key** - Encryption key for a keyed checksum
**[in]** **usage** - Key usage (see :data:`KRB5_KEYUSAGE` types)
**[in]** **input** - Input data
**[out]** **cksum** - Generated checksum
..
:retval:
- 0 Success; otherwise - Kerberos error codes
..
This function computes a checksum of type *cksumtype* over *input* , using *key* if the checksum type is a keyed checksum. If *cksumtype* is 0 and *key* is non-null, the checksum type will be the mandatory-to-implement checksum type for the key's encryption type. The actual checksum key will be derived from *key* and *usage* if key derivation is specified for the checksum type. The newly created *cksum* must be released by calling :c:func:`krb5_free_checksum_contents()` when it is no longer needed.
..
.. seealso::
:c:func:`krb5_c_verify_checksum()`
.. note::
This function is similar to :c:func:`krb5_k_make_checksum()` , but operates on keyblock *key* .
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