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## net.i2p.data
Class Certificate

    java.lang.Object
      net.i2p.data.DataStructureImpl
          net.i2p.data.Certificate

All Implemented Interfaces:
  DataStructure

    public class Certificate

extends DataStructureImpl

Defines a certificate that can be attached to various I2P structures, such as RouterIdentity and Destination, allowing routers and clients to help manage denial of service attacks and the network utilization. Certificates can even be defined to include identifiable information signed by some certificate authority, though that use probably isn't appropriate for an anonymous network ;) Todo: Properly support multiple certificates

Author:
  jrandom

Field Summary
`protected byte[]` | `_payload`
`protected int` | `_type`
`static int` | `CERTIFICATE_LENGTH_SIGNED_WITH_HASH`
`static int` | `CERTIFICATE_TYPE_HASHCASH` specifies a Hashcash style certificate
`static int` | `CERTIFICATE_TYPE_HIDDEN` we should not be used for anything (don't use us in the netDb, in tunnels, or tell others about us)
`static int` | `CERTIFICATE_TYPE_MULTIPLE` Contains multiple certs
`static int` | `CERTIFICATE_TYPE_NULL` Specifies a null certificate type with no payload
`static int` | `CERTIFICATE_TYPE_SIGNED` Signed with 40-byte Signature and (optional) 32-byte hash
`static Certificate` | `NULL_CERT`

Constructor Summary
`Certificate()`
`Certificate(int type, byte[] payload)`

Method Summary
`static Certificate` | `create(byte[] data, int off)` If null cert, return immutable static instance, else create new
`static Certificate` | `create(InputStream in)` If null cert, return immutable static instance, else create new
`boolean` | `equals(Object object)`
`int` | `getCertificateType()`
`byte[]` | `getPayload()`
`int` | `hashCode()`
`int` | `readBytes(byte[] source, int offset)`
`void` | `readBytes(InputStream in)` Load up the current object with data from the given stream.
`void` | `setCertificateType(int type)`
`void` | `setPayload(byte[] payload)`
`int` | `size()`
`String` | `toString()`
`int` | `writeBytes(byte[] target, int offset)`
`void` | `writeBytes(OutputStream out)` Write out the data structure to the stream, using the format defined in the I2P data structure specification.

Methods inherited from class net.i2p.data.DataStructureImpl
`calculateHash, fromBase64, fromByteArray, read, toBase64, toByteArray`

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

Field Detail

### NULL_CERT

    public static final Certificate NULL_CERT

### _type

    protected int _type

### _payload

    protected byte[] _payload

### CERTIFICATE_TYPE_NULL

    public static final int CERTIFICATE_TYPE_NULL

  Specifies a null certificate type with no payload

  See Also:
    Constant Field Values

### CERTIFICATE_TYPE_HASHCASH

    public static final int CERTIFICATE_TYPE_HASHCASH

  specifies a Hashcash style certificate

  See Also:
    Constant Field Values

### CERTIFICATE_TYPE_HIDDEN

    public static final int CERTIFICATE_TYPE_HIDDEN

  we should not be used for anything (don't use us in the netDb, in tunnels, or tell others about us)

  See Also:
    Constant Field Values

### CERTIFICATE_TYPE_SIGNED

    public static final int CERTIFICATE_TYPE_SIGNED

  Signed with 40-byte Signature and (optional) 32-byte hash

  See Also:
    Constant Field Values

### CERTIFICATE_LENGTH_SIGNED_WITH_HASH

    public static final int CERTIFICATE_LENGTH_SIGNED_WITH_HASH

See Also:
  Constant Field Values

### CERTIFICATE_TYPE_MULTIPLE

    public static final int CERTIFICATE_TYPE_MULTIPLE

  Contains multiple certs

  See Also:
    Constant Field Values

Constructor Detail

### Certificate

    public Certificate()

### Certificate

    public Certificate(int type,
                       byte[] payload)

Method Detail

### create

    public static Certificate create(byte[] data,
                                     int off)

  If null cert, return immutable static instance, else create new

  Throws:
    `AIOOBE` - if not enough bytes
  Since:
    0.8.3

### create

    public static Certificate create(InputStream in)
                              throws DataFormatException,
                                     IOException

  If null cert, return immutable static instance, else create new

  Throws:
    `DataFormatException`
    `IOException`
  Since:
    0.8.3

### getCertificateType

    public int getCertificateType()

### setCertificateType

    public void setCertificateType(int type)

### getPayload

    public byte[] getPayload()

### setPayload

    public void setPayload(byte[] payload)

### readBytes

    public void readBytes(InputStream in)
                   throws DataFormatException,
                          IOException

  Description copied from interface: `DataStructure`
  Load up the current object with data from the given stream. Data loaded this way must match the I2P data structure specification.

  Parameters:
    `in` - stream to read from
  Throws:
    `DataFormatException` - if the data is improperly formatted
    `IOException` - if there was a problem reading the stream

### writeBytes

    public void writeBytes(OutputStream out)
                    throws DataFormatException,
                           IOException

  Description copied from interface: `DataStructure`
  Write out the data structure to the stream, using the format defined in the I2P data structure specification.

  Parameters:
    `out` - stream to write to
  Throws:
    `DataFormatException` - if the data was incomplete or not yet ready to be written
    `IOException` - if there was a problem writing to the stream

### writeBytes

    public int writeBytes(byte[] target,
                          int offset)

  Returns:
    the written length (NOT the new offset)

### readBytes

    public int readBytes(byte[] source,
                         int offset)
                  throws DataFormatException

  Throws:
    `DataFormatException`

### size

    public int size()

### equals

    public boolean equals(Object object)

  Overrides:
    `equals` in class `Object`

### hashCode

    public int hashCode()

  Overrides:
    `hashCode` in class `Object`

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`

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