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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.

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package org.bouncycastle.pqc.crypto.xmss;

/**
 * WOTS+ signature.
 *
 */
public final class WOTSPlusSignature {

	private byte[][] signature;

	protected WOTSPlusSignature(WOTSPlusParameters params, byte[][] signature) {
		super();
		if (params == null) {
			throw new NullPointerException("params == null");
		}
		if (signature == null) {
			throw new NullPointerException("signature == null");
		}
		if (XMSSUtil.hasNullPointer(signature)) {
			throw new NullPointerException("signature byte array == null");
		}
		if (signature.length != params.getLen()) {
			throw new IllegalArgumentException("wrong signature size");
		}
		for (int i = 0; i < signature.length; i++) {
			if (signature[i].length != params.getDigestSize()) {
				throw new IllegalArgumentException("wrong signature format");
			}
		}
		this.signature = XMSSUtil.cloneArray(signature);
	}

	public byte[][] toByteArray() {
		return XMSSUtil.cloneArray(signature);
	}
}