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krb5_c_prfplus - Generate pseudo-random bytes using RFC 6113 PRF+.
====================================================================
..
.. c:function:: krb5_error_code krb5_c_prfplus(krb5_context context, const krb5_keyblock * k, const krb5_data * input, krb5_data * output)
..
:param:
**[in]** **context** - Library context
**[in]** **k** - KDC contribution key
**[in]** **input** - Input data
**[out]** **output** - Pseudo-random output buffer
..
:return:
- 0 on success, E2BIG if output->length is too large for PRF+ to generate, ENOMEM on allocation failure, or an error code from krb5_c_prf()
..
This function fills *output* with PRF+(k, input) as defined in RFC 6113 section 5.1. The caller must preinitialize *output* and allocate the desired amount of space. The length of the pseudo-random output will match the length of *output* .
..
.. note::
RFC 4402 defines a different PRF+ operation. This function does not implement that operation.
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