/// <summary>
/// Get the next unused GMSS private key.
/// <para>Use this call to get a new private key for each signing operation.</para>
/// </summary>
///
/// <returns>The next available private key</returns>
public GMSSPrivateKey NextKey()
{
GMSSPrivateKey nKey = new GMSSPrivateKey(this);
nKey.NextKey(_gmssPS.NumLayers - 1);
return nKey;
}
/// <summary>
/// Generate an encryption Key pair
/// </summary>
///
/// <returns>A GMSSKeyPair containing public and private keys</returns>
public IAsymmetricKeyPair GenerateKeyPair()
{
// initialize authenticationPaths and treehash instances
byte[][][] currentAuthPaths = new byte[_numLayer][][];
byte[][][] nextAuthPaths = new byte[_numLayer - 1][][];
Treehash[][] currentTreehash = new Treehash[_numLayer][];
Treehash[][] nextTreehash = new Treehash[_numLayer - 1][];
List<byte[]>[] currentStack = new List<byte[]>[_numLayer];
List<byte[]>[] nextStack = new List<byte[]>[_numLayer - 1];
List<byte[]>[][] currentRetain = new List<byte[]>[_numLayer][];
List<byte[]>[][] nextRetain = new List<byte[]>[_numLayer - 1][];
for (int i = 0; i < _numLayer; i++)
{
currentAuthPaths[i] = ArrayUtils.CreateJagged<byte[][]>(_heightOfTrees[i], _mdLength);//new byte[heightOfTrees[i]][mdLength];
currentTreehash[i] = new Treehash[_heightOfTrees[i] - _K[i]];
if (i > 0)
{
nextAuthPaths[i - 1] = ArrayUtils.CreateJagged<byte[][]>(_heightOfTrees[i], _mdLength);//new byte[heightOfTrees[i]][mdLength];
nextTreehash[i - 1] = new Treehash[_heightOfTrees[i] - _K[i]];
}
currentStack[i] = new List<byte[]>();
if (i > 0)
nextStack[i - 1] = new List<byte[]>();
}
// initialize roots
byte[][] currentRoots = ArrayUtils.CreateJagged<byte[][]>(_numLayer, _mdLength);
byte[][] nextRoots = ArrayUtils.CreateJagged<byte[][]>(_numLayer - 1, _mdLength);
// initialize seeds
byte[][] seeds = ArrayUtils.CreateJagged<byte[][]>(_numLayer, _mdLength);
// initialize seeds[] by copying starting-seeds of first trees of each layer
for (int i = 0; i < _numLayer; i++)
Array.Copy(_currentSeeds[i], 0, seeds[i], 0, _mdLength);
// initialize rootSigs
_currentRootSigs = ArrayUtils.CreateJagged<byte[][]>(_numLayer - 1, _mdLength);//new byte[numLayer - 1][mdLength];
// calculation of current authpaths and current rootsigs (AUTHPATHS, SIG) from bottom up to the root
for (int h = _numLayer - 1; h >= 0; h--)
{
GMSSRootCalc tree = new GMSSRootCalc(_heightOfTrees[h], _K[h], GetDigest(_msgDigestType));
try
{
// on lowest layer no lower root is available, so just call the method with null as first parameter
if (h == _numLayer - 1)
tree = GenerateCurrentAuthpathAndRoot(null, currentStack[h], seeds[h], h);
else
// otherwise call the method with the former computed root value
tree = GenerateCurrentAuthpathAndRoot(currentRoots[h + 1], currentStack[h], seeds[h], h);
}
catch
{
}
// set initial values needed for the private key construction
for (int i = 0; i < _heightOfTrees[h]; i++)
Array.Copy(tree.GetAuthPath()[i], 0, currentAuthPaths[h][i], 0, _mdLength);
currentRetain[h] = tree.GetRetain();
currentTreehash[h] = tree.GetTreehash();
Array.Copy(tree.GetRoot(), 0, currentRoots[h], 0, _mdLength);
}
// calculation of next authpaths and next roots (AUTHPATHS+, ROOTS+)
for (int h = _numLayer - 2; h >= 0; h--)
{
GMSSRootCalc tree = GenerateNextAuthpathAndRoot(nextStack[h], seeds[h + 1], h + 1);
// set initial values needed for the private key construction
for (int i = 0; i < _heightOfTrees[h + 1]; i++)
Array.Copy(tree.GetAuthPath()[i], 0, nextAuthPaths[h][i], 0, _mdLength);
nextRetain[h] = tree.GetRetain();
nextTreehash[h] = tree.GetTreehash();
Array.Copy(tree.GetRoot(), 0, nextRoots[h], 0, _mdLength);
// create seed for the Merkle tree after next (nextNextSeeds) SEEDs++
Array.Copy(seeds[h + 1], 0, _nextNextSeeds[h], 0, _mdLength);
}
// generate JDKGMSSPublicKey
int[] len = new int[] { currentRoots[0].Length };
byte[] btlen = new byte[4];
Buffer.BlockCopy(len, 0, btlen, 0, btlen.Length);
GMSSPublicKey pubKey = new GMSSPublicKey(ArrayUtils.Concat(btlen, currentRoots[0]));
// generate the JDKGMSSPrivateKey
GMSSPrivateKey privKey = new GMSSPrivateKey(_currentSeeds, _nextNextSeeds, currentAuthPaths, nextAuthPaths, currentTreehash,
nextTreehash, currentStack, nextStack, currentRetain, nextRetain, nextRoots, _currentRootSigs, _gmssParams, _msgDigestType);
// return the KeyPair
return new GMSSKeyPair(pubKey, privKey);
}
/// <summary>
/// Copy Constructor
/// </summary>
///
/// <param name="PrivateKey">The GMSSPrivateKey to copy</param>
private GMSSPrivateKey(GMSSPrivateKey PrivateKey)
{
_index = ArrayUtils.Clone(PrivateKey._index);
_currentSeeds = GMSSUtil.Clone(PrivateKey._currentSeeds);
_nextNextSeeds = GMSSUtil.Clone(PrivateKey._nextNextSeeds);
_currentAuthPaths = GMSSUtil.Clone(PrivateKey._currentAuthPaths);
_nextAuthPaths = GMSSUtil.Clone(PrivateKey._nextAuthPaths);
_keep = GMSSUtil.Clone(PrivateKey._keep);
_currentTreehash = PrivateKey._currentTreehash;
_nextTreehash = PrivateKey._nextTreehash;
_currentStack = PrivateKey._currentStack;
_nextStack = PrivateKey._nextStack;
_currentRetain = PrivateKey._currentRetain;
_nextRetain = PrivateKey._nextRetain;
_nextNextLeaf = PrivateKey._nextNextLeaf; //N
_upperLeaf = PrivateKey._upperLeaf; //N
_upperTreehashLeaf = PrivateKey._upperTreehashLeaf; //N
_minTreehash = PrivateKey._minTreehash; //N
_nextRoot = GMSSUtil.Clone(PrivateKey._nextRoot);
_nextNextRoot = PrivateKey._nextNextRoot; //N
_currentRootSig = PrivateKey._currentRootSig;
_nextRootSig = PrivateKey._nextRootSig; //N
_gmssPS = PrivateKey._gmssPS;
_msgDigestType = PrivateKey._msgDigestType;
_heightOfTrees = PrivateKey._heightOfTrees;
_otsIndex = PrivateKey._otsIndex;
_K = PrivateKey._K;
_numLayer = PrivateKey._numLayer;
_msgDigestTrees = PrivateKey._msgDigestTrees;
_mdLength = PrivateKey._mdLength;
_gmssRandom = PrivateKey._gmssRandom;
_numLeafs = PrivateKey._numLeafs;
}
