KeyPairs.java

package io.fathom.cloud.secrets.services.ca;

import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;

import org.bouncycastle.openssl.PEMReader;
import org.bouncycastle.openssl.PEMWriter;

import com.fathomdb.crypto.bouncycastle.BouncyCastleLoader;
import com.fathomdb.io.IoUtils;

public class KeyPairs {

    public static KeyPair fromPem(String keyData) throws IOException {
        PEMReader r = new PEMReader(new StringReader(keyData), null, BouncyCastleLoader.getName());
        try {
            return (KeyPair) r.readObject();
        } finally {
            IoUtils.safeClose(r);
        }
    }

    public static String toPem(KeyPair keyPair) throws IOException {
        StringWriter writer = new StringWriter();
        PEMWriter pemWriter = new PEMWriter(writer, BouncyCastleLoader.getName());
        try {
            pemWriter.writeObject(keyPair);
            pemWriter.flush();
            return writer.toString();
        } finally {
            IoUtils.safeClose(pemWriter);
        }
    }

    public static KeyPair generateKeyPair(String algorithm, Integer keySize) {
        KeyPairGenerator generator;
        try {
            generator = KeyPairGenerator.getInstance(algorithm);
        } catch (NoSuchAlgorithmException e) {
            throw new IllegalStateException("Error building keypair generator: " + algorithm, e);
        }
        if (keySize != null) {
            generator.initialize(keySize);
        }
        return generator.generateKeyPair();
    }

}