Package net.i2p.data

Class PublicKey

java.lang.Object
net.i2p.data.SimpleDataStructure
net.i2p.data.PublicKey
All Implemented Interfaces:
DataStructure
Direct Known Subclasses:
NextSessionKey
public class PublicKey extends SimpleDataStructure
Defines the PublicKey as defined by the I2P data structure spec. A public key is 256byte Integer. The public key represents only the exponent, not the primes, which are constant and defined in the crypto spec. As of release 0.9.38, keys of arbitrary length and type are supported. Note: Support for keys longer than 256 bytes unimplemented. See EncType.
Author:
jrandom

  • Field Details

    • KEYSIZE_BYTES

      public static final int KEYSIZE_BYTES

  • Constructor Details

    • PublicKey

      public PublicKey()

    • PublicKey

      public PublicKey(EncType type)
      Parameters:
      type - if null, type is unknown
      Since:
      0.9.38

    • PublicKey

      public PublicKey(byte[] data)
      Parameters:
      data - must be non-null

    • PublicKey

      public PublicKey(EncType type, byte[] data)
      Parameters:
      type - if null, type is unknown
      data - must be non-null
      Since:
      0.9.38

    • PublicKey

      public PublicKey(int typeCode, byte[] data)
      Unknown type only.
      Parameters:
      typeCode - must not match a known type. 1-255
      data - must be non-null
      Since:
      0.9.38

    • PublicKey

      public PublicKey(String base64Data) throws DataFormatException
      Constructs from base64. ElGamal only.
      Parameters:
      base64Data - a string of base64 data (the output of .toBase64() called on a prior instance of PublicKey
      Throws:
      DataFormatException

  • Method Details

    • create

      public static PublicKey create(byte[] data, int off)
      Pull from cache or return new. ELGAMAL_2048 only! Deprecated - used only by deprecated Destination.readBytes(data, off)
      Throws:
      ArrayIndexOutOfBoundsException - if not enough bytes, FIXME should throw DataFormatException
      Since:
      0.8.3

    • create

      public static PublicKey create(InputStream in) throws IOException
      Pull from cache or return new. ELGAMAL_2048 only!
      Throws:
      IOException
      Since:
      0.8.3

    • length

      public int length()
      Description copied from class: SimpleDataStructure
      The legal length of the byte array in this data structure
      Specified by:
      length in class SimpleDataStructure

    • getType

      public EncType getType()
      Returns:
      null if unknown
      Since:
      0.9.38

    • getUnknownTypeCode

      public int getUnknownTypeCode()
      Only valid if getType() returns null
      Since:
      0.9.38

    • toTypedKey

      public PublicKey toTypedKey(KeyCertificate kcert)
      Up-convert this from an untyped (type 0) PK to a typed PK based on the Key Cert given. The type of the returned key will be null if the kcert sigtype is null.
      Throws:
      IllegalArgumentException - if this is already typed to a different type
      Since:
      0.9.42

    • getPadding

      public byte[] getPadding(KeyCertificate kcert)
      Get the portion of this (type 0) PK that is really padding based on the Key Cert type given, if any
      Returns:
      trailing padding length > 0 or null if no padding or type is unknown
      Throws:
      IllegalArgumentException - if this is already typed to a different type
      Since:
      0.9.42

    • clearCache

      public static void clearCache()
      Since:
      0.9.17

    • toString

      public String toString()
      Overrides:
      toString in class SimpleDataStructure
      Since:
      0.9.38

    • hashCode

      public int hashCode()
      Description copied from class: SimpleDataStructure
      We assume the data has enough randomness in it, so use the first 4 bytes for speed. If this is not the case, override in the extending class.
      Overrides:
      hashCode in class SimpleDataStructure
      Since:
      0.9.42

    • equals

      public boolean equals(Object obj)
      Description copied from class: SimpleDataStructure
      Warning - this returns true for two different classes with the same size and same data, e.g. SessionKey and SessionTag, but you wouldn't put them in the same Set, would you?
      Overrides:
      equals in class SimpleDataStructure
      Since:
      0.9.42