software.engine
Class Commitments

java.lang.Object
  software.engine.Commitments

public class Commitments
extends java.lang.Object

Computes salts and commitments for the P and D tables.

Author:

stefan

Field Summary

static byte[]	D1D2_HALF_ROW_CONSTANT
static byte[]	D4D5_HALF_ROW_CONSTANT
static byte[]	P1CONSTANT
static byte[]	P2CONSTANT

Constructor Summary

Commitments()

Method Summary

static byte[]	commitD(byte[] salt, byte[] c, byte partitionId, byte instanceId, byte[] rowId, int d1, byte[] d2)
static byte[]	commitP(byte[] salt, byte[] c, byte[] serial, byte[] p1)
static javax.crypto.spec.SecretKeySpec	saltDRowLeft(javax.crypto.spec.SecretKeySpec mk1, javax.crypto.spec.SecretKeySpec mk2, byte[] c, byte partitionId, byte dNo, byte[] rowId)
static javax.crypto.spec.SecretKeySpec	saltDRowRight(javax.crypto.spec.SecretKeySpec mk1, javax.crypto.spec.SecretKeySpec mk2, byte[] c, byte partitionId, byte dNo, byte[] rowId)
static javax.crypto.spec.SecretKeySpec	saltP1(javax.crypto.spec.SecretKeySpec mk1, javax.crypto.spec.SecretKeySpec mk2, byte[] c, byte[] serial)
static javax.crypto.spec.SecretKeySpec	saltP2(javax.crypto.spec.SecretKeySpec mk1, javax.crypto.spec.SecretKeySpec mk2, byte[] c, byte[] serial)

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

P1CONSTANT

public static byte[] P1CONSTANT

P2CONSTANT

public static byte[] P2CONSTANT

D1D2_HALF_ROW_CONSTANT

public static byte[] D1D2_HALF_ROW_CONSTANT

D4D5_HALF_ROW_CONSTANT

public static byte[] D4D5_HALF_ROW_CONSTANT

Constructor Detail

Commitments

public Commitments()

Method Detail

commitP

public static byte[] commitP(byte[] salt,
                             byte[] c,
                             byte[] serial,
                             byte[] p1)
                      throws java.lang.Exception

Parameters:

salt -

c - - public constant

serial - - the p id

p1 - - the message to be commitmed to

Returns:

a comitment to p1 computed using SecurityUtil.getCommitment

Throws:

java.lang.Exception - - no Exception is caugth and no Exception is Explicitly thrown

commitD

public static byte[] commitD(byte[] salt,
                             byte[] c,
                             byte partitionId,
                             byte instanceId,
                             byte[] rowId,
                             int d1,
                             byte[] d2)
                      throws java.lang.Exception

Parameters:

salt -

c - - public constant

partitionId -

instanceId -

rowId -

d1 - - the pointer to P (or R)

d2 - - the transformation to be commited to

Returns:

a commitment to d2 using SecurityUtil.getCommitment

Throws:

java.lang.Exception - - no Exception is caugth and no Exception is Explicitly thrown

saltP1

public static javax.crypto.spec.SecretKeySpec saltP1(javax.crypto.spec.SecretKeySpec mk1,
                                                     javax.crypto.spec.SecretKeySpec mk2,
                                                     byte[] c,
                                                     byte[] serial)
                                              throws java.lang.Exception

Parameters:

mk1 -

mk2 -

c -

serial -

Returns:

the salt to be used for the p1 commitment

Throws:

java.lang.Exception - - no Exception is caugth and no Exception is Explicitly thrown

saltP2

public static javax.crypto.spec.SecretKeySpec saltP2(javax.crypto.spec.SecretKeySpec mk1,
                                                     javax.crypto.spec.SecretKeySpec mk2,
                                                     byte[] c,
                                                     byte[] serial)
                                              throws java.lang.Exception

Parameters:

mk1 -

mk2 -

c -

serial -

Returns:

the salt to be used for the p2 commitment

Throws:

java.lang.Exception - - no Exception is caugth and no Exception is Explicitly thrown

saltDRowLeft

public static javax.crypto.spec.SecretKeySpec saltDRowLeft(javax.crypto.spec.SecretKeySpec mk1,
                                                           javax.crypto.spec.SecretKeySpec mk2,
                                                           byte[] c,
                                                           byte partitionId,
                                                           byte dNo,
                                                           byte[] rowId)
                                                    throws java.lang.Exception

Parameters:

mk1 -

mk2 -

c -

partitionId -

dNo -

rowId -

Returns:

the salt to be used for the commitment to the first half of a D row

Throws:

java.lang.Exception - - no Exception is caugth and no Exception is Explicitly thrown

saltDRowRight

public static javax.crypto.spec.SecretKeySpec saltDRowRight(javax.crypto.spec.SecretKeySpec mk1,
                                                            javax.crypto.spec.SecretKeySpec mk2,
                                                            byte[] c,
                                                            byte partitionId,
                                                            byte dNo,
                                                            byte[] rowId)
                                                     throws java.lang.Exception

Parameters:

mk1 -

mk2 -

c -

partitionId -

dNo -

rowId -

Returns:

- the salt to be used for the commitment to the second half of the D row

Throws:

java.lang.Exception - - no Exception is caugth and no Exception is Explicitly thrown