aQute.libg.cryptography.Crypto Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of biz.aQute.bnd Show documentation

This command line utility is the Swiss army knife of OSGi. It provides you with a breadth of tools to understand and manage OSGi based systems. This project basically uses bndlib.

There is a newer version: 7.1.0

Show newest version

package aQute.libg.cryptography;

import java.math.BigInteger;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.RSAPublicKeySpec;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Crypto {
	static final Pattern	RSA_PRIVATE	= Pattern.compile("\\s*RSA\\.Private\\((\\p{XDigit})+:(\\p{XDigit})+\\)\\s*");
	static final Pattern	RSA_PUBLIC	= Pattern.compile("\\s*RSA\\.Public\\((\\p{XDigit})+:(\\p{XDigit})+\\)\\s*");

	/**
	 * @param 
	 * @param spec
	 * @return key
	 * @throws Exception
	 */
	@SuppressWarnings("unchecked")
	public static  T fromString(String spec, Class c) throws Exception {
		if (PrivateKey.class.isAssignableFrom(c)) {
			Matcher m = RSA_PRIVATE.matcher(spec);
			if (m.matches()) {
				return (T) RSA.createPrivate(new BigInteger(m.group(1)), new BigInteger(m.group(2)));
			}
			throw new IllegalArgumentException("No such private key " + spec);
		}

		if (PublicKey.class.isAssignableFrom(c)) {
			Matcher m = RSA_PUBLIC.matcher(spec);
			if (m.matches()) {
				return (T) RSA.create(new RSAPublicKeySpec(new BigInteger(m.group(1)), new BigInteger(m.group(2))));
			}
			throw new IllegalArgumentException("No such public key " + spec);
		}
		return null;
	}

	public static String toString(Object key) {
		if (key instanceof RSAPrivateKey) {
			RSAPrivateKey pk = (RSAPrivateKey) key;
			return "RSA.Private(" + pk.getModulus() + ":" + pk.getPrivateExponent() + ")";
		}
		if (key instanceof RSAPublicKey) {
			RSAPublicKey pk = (RSAPublicKey) key;
			return "RSA.Private(" + pk.getModulus() + ":" + pk.getPublicExponent() + ")";
		}
		return null;
	}

	// public static  Signer signer(PrivateKey key,
	// Digester digester) throws NoSuchAlgorithmException {
	// Signature s = Signature.getInstance(key.getAlgorithm() + "with" +
	// digester.getAlgorithm());
	// return new Signer(s,digester);
	// }

	public static Verifier verifier(PublicKey key, Digest digest) throws NoSuchAlgorithmException {
		Signature s = Signature.getInstance(key.getAlgorithm() + "with" + digest.getAlgorithm());
		return new Verifier(s, digest);
	}

}