/** * Generate a WOTS+ signature on a message without the corresponding * authentication path * * @param messageDigest Message digest of length n. * @param otsHashAddress OTS hash address. * @return XMSS signature. */ protected WOTSPlusSignature wotsSign(byte[] messageDigest, OTSHashAddress otsHashAddress) { if (messageDigest.length != params.getDigestSize()) { throw new IllegalArgumentException("size of messageDigest needs to be equal to size of digest"); } if (otsHashAddress == null) { throw new NullPointerException("otsHashAddress == null"); } /* (re)initialize WOTS+ instance */ wotsPlus.importKeys(wotsPlus.getWOTSPlusSecretKey(privateKey.getSecretKeySeed(), otsHashAddress), getPublicSeed()); /* create WOTS+ signature */ return wotsPlus.sign(messageDigest, otsHashAddress); }
private WOTSPlusSignature wotsSign(byte[] messageDigest, OTSHashAddress otsHashAddress) { if (messageDigest.length != params.getDigestSize()) { throw new IllegalArgumentException("size of messageDigest needs to be equal to size of digest"); } if (otsHashAddress == null) { throw new NullPointerException("otsHashAddress == null"); } /* (re)initialize WOTS+ instance */ params.getWOTSPlus().importKeys(params.getWOTSPlus().getWOTSPlusSecretKey(privateKey.getSecretKeySeed(), otsHashAddress), privateKey.getPublicSeed()); /* create WOTS+ signature */ return params.getWOTSPlus().sign(messageDigest, otsHashAddress); } }
protected void setIndex(int index) { privateKey = new XMSSPrivateKeyParameters.Builder(params) .withSecretKeySeed(privateKey.getSecretKeySeed()).withSecretKeyPRF(privateKey.getSecretKeyPRF()) .withPublicSeed(privateKey.getPublicSeed()).withRoot(privateKey.getRoot()) .withBDSState(privateKey.getBDSState()).build(); }
protected void setRoot(byte[] root) { privateKey = new XMSSPrivateKeyParameters.Builder(params) .withSecretKeySeed(privateKey.getSecretKeySeed()).withSecretKeyPRF(privateKey.getSecretKeyPRF()) .withPublicSeed(getPublicSeed()).withRoot(root).withBDSState(privateKey.getBDSState()).build(); publicKey = new XMSSPublicKeyParameters.Builder(params).withRoot(root).withPublicSeed(getPublicSeed()) .build(); }
protected void setPublicSeed(byte[] publicSeed) { privateKey = new XMSSPrivateKeyParameters.Builder(params) .withSecretKeySeed(privateKey.getSecretKeySeed()).withSecretKeyPRF(privateKey.getSecretKeyPRF()) .withPublicSeed(publicSeed).withRoot(getRoot()).withBDSState(privateKey.getBDSState()).build(); publicKey = new XMSSPublicKeyParameters.Builder(params).withRoot(getRoot()).withPublicSeed(publicSeed) .build(); wotsPlus.importKeys(new byte[params.getDigestSize()], publicSeed); }
/** * Generate a new XMSS private key / public key pair. */ public AsymmetricCipherKeyPair generateKeyPair() { /* generate private key */ XMSSPrivateKeyParameters privateKey = generatePrivateKey(params, prng); XMSSNode root = privateKey.getBDSState().getRoot(); privateKey = new XMSSPrivateKeyParameters.Builder(params) .withSecretKeySeed(privateKey.getSecretKeySeed()).withSecretKeyPRF(privateKey.getSecretKeyPRF()) .withPublicSeed(privateKey.getPublicSeed()).withRoot(root.getValue()) .withBDSState(privateKey.getBDSState()).build(); XMSSPublicKeyParameters publicKey = new XMSSPublicKeyParameters.Builder(params).withRoot(root.getValue()) .withPublicSeed(privateKey.getPublicSeed()).build(); return new AsymmetricCipherKeyPair(publicKey, privateKey); }