# MIT Kerberos Documentation

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# krb5_c_make_checksum - Compute a checksum (operates on keyblock).

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 `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 `krb5_free_checksum_contents()` when it is no longer needed.

See also

`krb5_c_verify_checksum()`

Note

This function is similar to `krb5_k_make_checksum()` , but operates on keyblock key .