gnu.crypto.key.srp6

Class SRPKeyPairRawCodec

public class SRPKeyPairRawCodec extends Object implements IKeyPairCodec

An object that implements the IKeyPairCodec operations for the Raw format to use with SRP keypairs.

Reference:

  1. SRP Protocol Design
    Thomas J. Wu.

Version: $Revision: 1.2 $

Method Summary
PrivateKeydecodePrivateKey(byte[] k)
PublicKeydecodePublicKey(byte[] k)
byte[]encodePrivateKey(PrivateKey key)

Returns the encoded form of the designated SRP private key according to the Raw format supported by this library.

The Raw format for an SRP private key, in this implementation, is a byte sequence consisting of the following:

  1. 4-byte magic consisting of the value of the literal MAGIC_RAW_SRP_PRIVATE_KEY,
  2. 1-byte version consisting of the constant: 0x01,
  3. 4-byte count of following bytes representing the SRP parameter N in internet order,
  4. n-bytes representation of a BigInteger obtained by invoking the toByteArray() method on the SRP parameter N,
  5. 4-byte count of following bytes representing the SRP parameter g,
  6. n-bytes representation of a BigInteger obtained by invoking the toByteArray() method on the SRP parameter g,
  7. 4-byte count of following bytes representing the SRP parameter x,
  8. n-bytes representation of a BigInteger obtained by invoking the toByteArray() method on the SRP parameter x,
  9. one byte which indicates whether the SRP parameter v is included in this encoding (value 0x01) or not (value 0x00).
  10. 4-byte count of following bytes representing the SRP parameter v,
  11. n-bytes representation of a BigInteger obtained by invoking the toByteArray() method on the SRP parameter v,
byte[]encodePublicKey(PublicKey key)

Returns the encoded form of the designated SRP public key according to the Raw format supported by this library.

The Raw format for an SRP public key, in this implementation, is a byte sequence consisting of the following:

  1. 4-byte magic consisting of the value of the literal MAGIC_RAW_SRP_PUBLIC_KEY,
  2. 1-byte version consisting of the constant: 0x01,
  3. 4-byte count of following bytes representing the SRP parameter N in internet order,
  4. n-bytes representation of a BigInteger obtained by invoking the toByteArray() method on the SRP parameter N,
  5. 4-byte count of following bytes representing the SRP parameter g,
  6. n-bytes representation of a BigInteger obtained by invoking the toByteArray() method on the SRP parameter g,
  7. 4-byte count of following bytes representing the SRP parameter y,
  8. n-bytes representation of a BigInteger obtained by invoking the toByteArray() method on the SRP parameter y,
intgetFormatID()

Method Detail

decodePrivateKey

public PrivateKey decodePrivateKey(byte[] k)

decodePublicKey

public PublicKey decodePublicKey(byte[] k)

encodePrivateKey

public byte[] encodePrivateKey(PrivateKey key)

Returns the encoded form of the designated SRP private key according to the Raw format supported by this library.

The Raw format for an SRP private key, in this implementation, is a byte sequence consisting of the following:

  1. 4-byte magic consisting of the value of the literal MAGIC_RAW_SRP_PRIVATE_KEY,
  2. 1-byte version consisting of the constant: 0x01,
  3. 4-byte count of following bytes representing the SRP parameter N in internet order,
  4. n-bytes representation of a BigInteger obtained by invoking the toByteArray() method on the SRP parameter N,
  5. 4-byte count of following bytes representing the SRP parameter g,
  6. n-bytes representation of a BigInteger obtained by invoking the toByteArray() method on the SRP parameter g,
  7. 4-byte count of following bytes representing the SRP parameter x,
  8. n-bytes representation of a BigInteger obtained by invoking the toByteArray() method on the SRP parameter x,
  9. one byte which indicates whether the SRP parameter v is included in this encoding (value 0x01) or not (value 0x00).
  10. 4-byte count of following bytes representing the SRP parameter v,
  11. n-bytes representation of a BigInteger obtained by invoking the toByteArray() method on the SRP parameter v,

Parameters: key the key to encode.

Returns: the Raw format encoding of the designated key.

Throws: IllegalArgumentException if the designated key is not an SRP one.

encodePublicKey

public byte[] encodePublicKey(PublicKey key)

Returns the encoded form of the designated SRP public key according to the Raw format supported by this library.

The Raw format for an SRP public key, in this implementation, is a byte sequence consisting of the following:

  1. 4-byte magic consisting of the value of the literal MAGIC_RAW_SRP_PUBLIC_KEY,
  2. 1-byte version consisting of the constant: 0x01,
  3. 4-byte count of following bytes representing the SRP parameter N in internet order,
  4. n-bytes representation of a BigInteger obtained by invoking the toByteArray() method on the SRP parameter N,
  5. 4-byte count of following bytes representing the SRP parameter g,
  6. n-bytes representation of a BigInteger obtained by invoking the toByteArray() method on the SRP parameter g,
  7. 4-byte count of following bytes representing the SRP parameter y,
  8. n-bytes representation of a BigInteger obtained by invoking the toByteArray() method on the SRP parameter y,

Parameters: key the key to encode.

Returns: the Raw format encoding of the designated key.

Throws: IllegalArgumentException if the designated key is not an SRP one.

getFormatID

public int getFormatID()
Copyright © 2001, 2002, 2003 Free Software Foundation, Inc. All Rights Reserved.