krb5_k_make_checksum_iov -  Fill in a checksum element in IOV array (operates on opaque key) 
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.. c:function:: krb5_error_code krb5_k_make_checksum_iov(krb5_context context, krb5_cksumtype cksumtype, krb5_key key, krb5_keyusage usage, krb5_crypto_iov * data, size_t num_data)

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: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 KRB5_KEYUSAGE macros)

	          **[inout]** **data** - IOV array

	          **[in]** **num_data** - Size of *data*


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:retval:
         -   0   Success; otherwise - Kerberos error codes


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Create a checksum in the KRB5_CRYPTO_TYPE_CHECKSUM element over KRB5_CRYPTO_TYPE_DATA and KRB5_CRYPTO_TYPE_SIGN_ONLY chunks in *data* . Only the KRB5_CRYPTO_TYPE_CHECKSUM region is modified.










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.. seealso::
         krb5_k_verify_checksum_iov()
 





.. note::

	 This function is similar to krb5_c_make_checksum_iov(), but operates on opaque *key* .
 



