Introduction to GSS-API services

# GSS-API services

## Context creation

- delegation
- mutual authentication
- anonymous
- use per message before context creation has completed

return status:

- support conf
- support int

## Context creation flags

- GSS_C_DELEG_FLAG
- GSS_C_MUTUAL_FLAG
- GSS_C_REPLAY_FLAG
- GSS_C_SEQUENCE_FLAG
- GSS_C_CONF_FLAG
- GSS_C_INTEG_FLAG
- GSS_C_ANON_FLAG
- GSS_C_PROT_READY_FLAG
- GSS_C_TRANS_FLAG
- GSS_C_DCE_STYLE
- GSS_C_IDENTIFY_FLAG
- GSS_C_EXTENDED_ERROR_FLAG
- GSS_C_DELEG_POLICY_FLAG

## Per-message services

- conf
- int
- message integrity
- replay detection
- out of sequence