krb5_c_crypto_length_iov -  Fill in lengths for header, trailer and padding in a IOV array. 
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.. c:function:: krb5_error_code krb5_c_crypto_length_iov(krb5_context context, krb5_enctype enctype, krb5_crypto_iov * data, size_t num_data)

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:param:

	          **[in]** **context** - Library context

	          **[in]** **enctype** - Encryption type

	          **[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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Padding is set to the actual padding required based on the provided *data* buffers. Typically this API is used after setting up the data buffers and :data:`KRB5_CRYPTO_TYPE_SIGN_ONLY` buffers, but before actually allocating header, trailer and padding.










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