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/*
* Copyright (c) 2017-2019 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file protocol/ah.h
* @brief AH packet header
*/
#ifndef HICN_PROTOCOL_AH_H
#define HICN_PROTOCOL_AH_H
#include "../common.h"
/*
* The TCP PSH flag is set to indicate TCP payload in fact contains a AH header
* with signature information for the packet
*/
#define AH_FLAG 0x10
/*
* The length of the AH struct must be 44 bytes.
*/
#define EXPECTED_AH_HDRLEN 44
typedef struct
{
u8 nh; // (to match with reserved in IPSEC AH)
u8 payloadlen; // Len of signature/HMAC in 4-bytes words
union
{
u16 reserved;
struct
{
u8 validationAlgorithm; // As defined in parc_SignerAlgorithm.h
u8 unused; // Unused (to match with reserved in IPSEC AH)
};
};
union
{
struct
{
u32 spi;
u32 seq;
};
// Unix timestamp indicating when the signature has been calculated
u8 timestamp_as_u8[8];
u16 timestamp_as_u16[4];
u32 timestamp_as_u32[2];
};
// ICV would follow
u8 keyId[32]; // Hash of the pub key
/* 44 B + validationPayload */
u8 validationPayload[0]; // Holds the signature
} _ah_header_t;
#define AH_HDRLEN sizeof(_ah_header_t)
static_assert (EXPECTED_AH_HDRLEN == AH_HDRLEN,
"Size of AH Struct does not match its expected size.");
#endif /* HICN_PROTOCOL_AH_H */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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