## net.i2p.data
Class PrivateKey

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

All Implemented Interfaces:
  DataStructure

    public class PrivateKey

extends DataStructureImpl

Defines the PrivateKey as defined by the I2P data structure spec. A private key is 256byte Integer. The private key represents only the exponent, not the primes, which are constant and defined in the crypto spec.

Author:
  jrandom

Field Summary
`static int` `KEYSIZE_BYTES`

Constructor Summary
`PrivateKey()`
`PrivateKey(byte[] data)`
`PrivateKey(java.lang.String base64Data)` constructs from base64

Method Summary
`boolean` `equals(java.lang.Object obj)`
`byte[]` `getData()`
`int` `hashCode()`
`void` `readBytes(java.io.InputStream in)` Load up the current object with data from the given stream.
`void` `setData(byte[] data)`
`PublicKey` `toPublic()` derives a new PublicKey object derived from the secret contents of this PrivateKey
`java.lang.String` `toString()`
`void` `writeBytes(java.io.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

### KEYSIZE_BYTES

    public static final int KEYSIZE_BYTES

See Also:
  Constant Field Values

Constructor Detail

### PrivateKey

    public PrivateKey()

### PrivateKey

    public PrivateKey(byte[] data)

### PrivateKey

    public PrivateKey(java.lang.String base64Data)
               throws DataFormatException

  constructs from base64

  Parameters:
    `base64Data` - a string of base64 data (the output of .toBase64() called on a prior instance of PrivateKey
  Throws:
    `DataFormatException`

Method Detail

### getData

    public byte[] getData()

### setData

    public void setData(byte[] data)

### readBytes

    public void readBytes(java.io.InputStream in)
                   throws DataFormatException,
                          java.io.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
    `java.io.IOException` - if there was a problem reading the stream

### writeBytes

    public void writeBytes(java.io.OutputStream out)
                    throws DataFormatException,
                           java.io.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
    `java.io.IOException` - if there was a problem writing to the stream

### equals

    public boolean equals(java.lang.Object obj)

  Overrides:
    `equals` in class `java.lang.Object`

### hashCode

    public int hashCode()

  Overrides:
    `hashCode` in class `java.lang.Object`

### toString

    public java.lang.String toString()

  Overrides:
    `toString` in class `java.lang.Object`

### toPublic

    public PublicKey toPublic()

  derives a new PublicKey object derived from the secret contents of this PrivateKey

  Returns:
    a PublicKey object