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## net.i2p.data.i2np
Class BuildRequestRecord

    java.lang.Object
      net.i2p.data.i2np.BuildRequestRecord

    public class BuildRequestRecord

extends Object

Hold the tunnel request record, managing its ElGamal encryption and decryption. Iterative AES encryption/decryption is done elsewhere. Cleartext:

       bytes     0-3: tunnel ID to receive messages as
       bytes    4-35: local router identity hash
       bytes   36-39: next tunnel ID
       bytes   40-71: next router identity hash
       bytes  72-103: AES-256 tunnel layer key
       bytes 104-135: AES-256 tunnel IV key
       bytes 136-167: AES-256 reply key
       bytes 168-183: reply IV
       byte      184: flags
       bytes 185-188: request time (in hours since the epoch)
       bytes 189-192: next message ID
       bytes 193-221: uninterpreted / random padding

Encrypted:

       bytes    0-15: First 16 bytes of router hash
       bytes  16-527: ElGamal encrypted block (discarding zero bytes at elg[0] and elg[257])

Field Summary
`static int` | `IV_SIZE`
`static int` | `PEER_SIZE` we show 16 bytes of the peer hash outside the elGamal block

Constructor Summary
`BuildRequestRecord()`
`BuildRequestRecord(ByteArray data)`

Method Summary
`void` | `createRecord(I2PAppContext ctx, long receiveTunnelId, Hash peer, long nextTunnelId, Hash nextHop, long nextMsgId, SessionKey layerKey, SessionKey ivKey, SessionKey replyKey, byte[] iv, boolean isInGateway, boolean isOutEndpoint)` Populate this instance with data.
`boolean` | `decryptRecord(I2PAppContext ctx, PrivateKey ourKey, Hash ourIdent, ByteArray encryptedRecord)` Decrypt the data from the specified record, writing the decrypted record into this instance's buffer (but not overwriting the array contained within the old buffer)
`void` | `encryptRecord(I2PAppContext ctx, PublicKey toKey, Hash toPeer, byte[] out, int outOffset)` Encrypt the record to the specified peer.
`ByteArray` | `getData()`
`boolean` | `readIsInboundGateway()` The current hop is the inbound gateway.
`boolean` | `readIsOutboundEndpoint()` The current hop is the outbound endpoint.
`SessionKey` | `readIVKey()` Tunnel IV encryption key that the current hop should use
`SessionKey` | `readLayerKey()` Tunnel layer encryption key that the current hop should use
`Hash` | `readNextIdentity()` Read the next hop from the record.
`long` | `readNextTunnelId()` What tunnel ID the next hop receives messages on.
`boolean` | `readOurIdentityMatches(Hash ourIdentity)` true if the identity they expect us to be is who we are
`long` | `readReceiveTunnelId()` what tunnel ID should this receive messages on
`byte[]` | `readReplyIV()` IV that should be used to encrypt the reply
`SessionKey` | `readReplyKey()` Session key that should be used to encrypt the reply
`long` | `readReplyMessageId()` What message ID should we send the request to the next hop with.
`long` | `readRequestTime()` Time that the request was sent, truncated to the nearest hour
`void` | `setData(ByteArray data)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### IV_SIZE

    public static final int IV_SIZE

See Also:
  Constant Field Values

### PEER_SIZE

    public static final int PEER_SIZE

  we show 16 bytes of the peer hash outside the elGamal block

  See Also:
    Constant Field Values

Constructor Detail

### BuildRequestRecord

    public BuildRequestRecord(ByteArray data)

### BuildRequestRecord

    public BuildRequestRecord()

Method Detail

### getData

    public ByteArray getData()

### setData

    public void setData(ByteArray data)

### readReceiveTunnelId

    public long readReceiveTunnelId()

  what tunnel ID should this receive messages on

### readOurIdentityMatches

    public boolean readOurIdentityMatches(Hash ourIdentity)

  true if the identity they expect us to be is who we are

### readNextTunnelId

    public long readNextTunnelId()

  What tunnel ID the next hop receives messages on. If this is the outbound tunnel endpoint, this specifies the tunnel ID to which the reply should be sent.

### readNextIdentity

    public Hash readNextIdentity()

  Read the next hop from the record. If this is the outbound tunnel endpoint, this specifies the gateway to which the reply should be sent.

### readLayerKey

    public SessionKey readLayerKey()

  Tunnel layer encryption key that the current hop should use

### readIVKey

    public SessionKey readIVKey()

  Tunnel IV encryption key that the current hop should use

### readReplyKey

    public SessionKey readReplyKey()

  Session key that should be used to encrypt the reply

### readReplyIV

    public byte[] readReplyIV()

  IV that should be used to encrypt the reply

### readIsInboundGateway

    public boolean readIsInboundGateway()

  The current hop is the inbound gateway. If this is true, it means anyone can send messages to this tunnel, but if it is false, only the current predecessor can.

### readIsOutboundEndpoint

    public boolean readIsOutboundEndpoint()

  The current hop is the outbound endpoint. If this is true, the next identity and next tunnel fields refer to where the reply should be sent.

### readRequestTime

    public long readRequestTime()

  Time that the request was sent, truncated to the nearest hour

### readReplyMessageId

    public long readReplyMessageId()

  What message ID should we send the request to the next hop with. If this is the outbound tunnel endpoint, this specifies the message ID with which the reply should be sent.

### encryptRecord

    public void encryptRecord(I2PAppContext ctx,
                              PublicKey toKey,
                              Hash toPeer,
                              byte[] out,
                              int outOffset)

  Encrypt the record to the specified peer. The result is formatted as:

         bytes 0-15: truncated SHA-256 of the current hop's identity (the toPeer parameter)
       bytes 15-527: ElGamal-2048 encrypted block

### decryptRecord

    public boolean decryptRecord(I2PAppContext ctx,
                                 PrivateKey ourKey,
                                 Hash ourIdent,
                                 ByteArray encryptedRecord)

  Decrypt the data from the specified record, writing the decrypted record into this instance's buffer (but not overwriting the array contained within the old buffer)

### createRecord

    public void createRecord(I2PAppContext ctx,
                             long receiveTunnelId,
                             Hash peer,
                             long nextTunnelId,
                             Hash nextHop,
                             long nextMsgId,
                             SessionKey layerKey,
                             SessionKey ivKey,
                             SessionKey replyKey,
                             byte[] iv,
                             boolean isInGateway,
                             boolean isOutEndpoint)

  Populate this instance with data. A new buffer is created to contain the data, with the necessary randomized padding.

  Parameters:
    `receiveTunnelId` - tunnel the current hop will receive messages on
    `peer` - current hop's identity
    `nextTunnelId` - id for the next hop, or where we send the reply (if we are the outbound endpoint)
    `nextHop` - next hop's identity, or where we send the reply (if we are the outbound endpoint)
    `nextMsgId` - message ID to use when sending on to the next hop (or for the reply)
    `layerKey` - tunnel layer key to be used by the peer
    `ivKey` - tunnel IV key to be used by the peer
    `replyKey` - key to be used when encrypting the reply to this build request
    `iv` - iv to be used when encrypting the reply to this build request
    `isInGateway` - are we the gateway of an inbound tunnel?
    `isOutEndpoint` - are we the endpoint of an outbound tunnel?

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