gistfile1.txt

import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.Signature;
import java.security.interfaces.*;
import java.security.spec.DSAPrivateKeySpec;
import java.security.spec.RSAPrivateKeySpec;
import org.bouncycastle.jce.spec.*;
import org.bouncycastle.jce.*;
import java.util.Base64;

class RubyOpenSSL {
	static byte[] DATA = "Sign me!".getBytes();

	public static void main(String[] args) throws Exception {
		java.security.Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
		System.out.println("data: \"" + new String(DATA) + "\"");
		RSAPKCS1v15();
		DSA();
		ECDSA();
	}

	static void RSAPKCS1v15() throws Exception {
		Signature signer = Signature.getInstance("SHA256withRSA", "BC");
		signer.initSign(RSA1024());
		signer.update(DATA);
		out("SHA256withRSA", signer.sign());
	}

	static void DSA() throws Exception {
		Signature signer = Signature.getInstance("SHA256withDSA", "BC");
		signer.initSign(DSA512());
		signer.update(DATA);
		out("SHA256withDSA", signer.sign());
	}

	static void ECDSA() throws Exception {
		Signature signer = Signature.getInstance("SHA256withECDSA", "BC");
		signer.initSign(P256());
		signer.update(DATA);
		out("SHA256withECDSA", signer.sign());
	}

	static RSAPrivateKey RSA1024() throws Exception {
		RSAPrivateKeySpec keySpec = new RSAPrivateKeySpec(
				new BigInteger("CBC2C4B0D440A73ED4FE3E43A01E170603BD67C02DBF9CBF395411A746A0F13AA8D587B0B168A3C44581EC93804F0A41376EBB5384F59CF648C711043BB9FF58D6B6C2CF495AC8DA87CB2C101152C59A9D5CA48B7F43781E2EFF190FDA62868C0A243C8C0E237A02B614999733BD6E3DEFA314DFE979E04EA517F25F14453987", 16),
				new BigInteger("A4A5FCC41AAF27B5C8ECACA97E8FF1F0C542DEBC56FB5790D9A54A228E1AECF2868D0CF9455215CB3A9352F499A0C4DB900C654886CEE587C9A539E5DED15C381EB240CC6A40F5BFA65E8D8B712644976C44CE4CB0F05164E7EB5F138276F5EED5358E4B54B54EBBC4AFF4F22FD7A1D9609D086CE95A074EE0A1DC7BBBECEE91", 16));
		KeyFactory keyFactory = KeyFactory.getInstance("RSA");
		return (RSAPrivateKey)keyFactory.generatePrivate(keySpec);
	}

	static DSAPrivateKey DSA512() throws Exception {
		DSAPrivateKeySpec keySpec = new DSAPrivateKeySpec(
				new BigInteger("046F7C878B62960E92E798EB7890F749EDEC969B", 16),
				new BigInteger("E650781AF1308EBB0C9460EA1ACC6B6EA785461EA8F4E5ADE858136221041DA398864231BF43A44593C3370386F7DEE60E3067BC32758B9E8E992DCC6D39E8BF", 16),
				new BigInteger("982E6FF683AD20C1E036461FB5326AB71A1B2E83", 16),
				new BigInteger("7D1DD170FF7B5DF0AE25D45647BFB4C265E27764B6FB745DD35A81943F4D37442AA88E2DFF94774AA1575340DB914BF9BA0E50B0863463890FE50518022C271A", 16));
		KeyFactory keyFactory = KeyFactory.getInstance("DSA");
		return (DSAPrivateKey)keyFactory.generatePrivate(keySpec);
	}

	static ECPrivateKey P256() throws Exception {
		ECParameterSpec paramSpec = ECNamedCurveTable.getParameterSpec("prime256v1");
		ECPrivateKeySpec keySpec = new ECPrivateKeySpec(
				new BigInteger("80F8F450EA71FD4ED5E3BCB1A4E01BBD146D7430F45AB0B1E9628ADD9A5A11F5", 16),
				paramSpec);
		KeyFactory keyFactory = KeyFactory.getInstance("ECDSA");
		return (ECPrivateKey)keyFactory.generatePrivate(keySpec);
	}

	static void out(String name, byte[] signature) {
		System.out.println(name);
		String base64 = Base64.getEncoder().encodeToString(signature);
		int len = base64.length();
		for (int i = 0; i < len; i += 60)
			System.out.println(base64.substring(i, i + 60 > len ? len : i + 60));
	}
}