# MIT Kerberos Documentation

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# krb5_c_make_checksum_iov - Fill in a checksum element in IOV array (operates on keyblock)

krb5_error_code `krb5_c_make_checksum_iov`(krb5_context context, krb5_cksumtype cksumtype, const krb5_keyblock * key, krb5_keyusage usage, krb5_crypto_iov * data, size_t num_data)

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` types) [inout] data - IOV array [in] num_data - Size of data

retval: | 0 Success; otherwise - Kerberos error codes

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.

See also

`krb5_c_verify_checksum_iov()`

Note

This function is similar to `krb5_k_make_checksum_iov()` , but operates on keyblock key .