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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 1.4.
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package org.bouncycastle.crypto.tls.test;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.bouncycastle.asn1.pkcs.RSAPrivateKey;
import org.bouncycastle.crypto.digests.SHA256Digest;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.params.RSAPrivateCrtKeyParameters;
import org.bouncycastle.crypto.tls.Certificate;
import org.bouncycastle.crypto.tls.DefaultTlsAgreementCredentials;
import org.bouncycastle.crypto.tls.DefaultTlsEncryptionCredentials;
import org.bouncycastle.crypto.tls.DefaultTlsSignerCredentials;
import org.bouncycastle.crypto.tls.SignatureAndHashAlgorithm;
import org.bouncycastle.crypto.tls.TlsAgreementCredentials;
import org.bouncycastle.crypto.tls.TlsContext;
import org.bouncycastle.crypto.tls.TlsEncryptionCredentials;
import org.bouncycastle.crypto.tls.TlsSignerCredentials;
import org.bouncycastle.crypto.util.PrivateKeyFactory;
import org.bouncycastle.util.encoders.Base64;
import org.bouncycastle.util.encoders.Hex;
import org.bouncycastle.util.io.pem.PemObject;
import org.bouncycastle.util.io.pem.PemReader;

public class TlsTestUtils
{
    static final byte[] rsaCertData = Base64
        .decode("MIICUzCCAf2gAwIBAgIBATANBgkqhkiG9w0BAQQFADCBjzELMAkGA1UEBhMCQVUxKDAmBgNVBAoMH1RoZSBMZWdpb2"
            + "4gb2YgdGhlIEJvdW5jeSBDYXN0bGUxEjAQBgNVBAcMCU1lbGJvdXJuZTERMA8GA1UECAwIVmljdG9yaWExLzAtBgkq"
            + "hkiG9w0BCQEWIGZlZWRiYWNrLWNyeXB0b0Bib3VuY3ljYXN0bGUub3JnMB4XDTEzMDIyNTA2MDIwNVoXDTEzMDIyNT"
            + "A2MDM0NVowgY8xCzAJBgNVBAYTAkFVMSgwJgYDVQQKDB9UaGUgTGVnaW9uIG9mIHRoZSBCb3VuY3kgQ2FzdGxlMRIw"
            + "EAYDVQQHDAlNZWxib3VybmUxETAPBgNVBAgMCFZpY3RvcmlhMS8wLQYJKoZIhvcNAQkBFiBmZWVkYmFjay1jcnlwdG"
            + "9AYm91bmN5Y2FzdGxlLm9yZzBaMA0GCSqGSIb3DQEBAQUAA0kAMEYCQQC0p+RhcFdPFqlwgrIr5YtqKmKXmEGb4Shy"
            + "pL26Ymz66ZAPdqv7EhOdzl3lZWT6srZUMWWgQMYGiHQg4z2R7X7XAgERo0QwQjAOBgNVHQ8BAf8EBAMCBSAwEgYDVR"
            + "0lAQH/BAgwBgYEVR0lADAcBgNVHREBAf8EEjAQgQ50ZXN0QHRlc3QudGVzdDANBgkqhkiG9w0BAQQFAANBAHU55Ncz"
            + "eglREcTg54YLUlGWu2WOYWhit/iM1eeq8Kivro7q98eW52jTuMI3CI5ulqd0hYzshQKQaZ5GDzErMyM=");

    static final byte[] dudRsaCertData = Base64
        .decode("MIICUzCCAf2gAwIBAgIBATANBgkqhkiG9w0BAQQFADCBjzELMAkGA1UEBhMCQVUxKDAmBgNVBAoMH1RoZSBMZWdpb2"
            + "4gb2YgdGhlIEJvdW5jeSBDYXN0bGUxEjAQBgNVBAcMCU1lbGJvdXJuZTERMA8GA1UECAwIVmljdG9yaWExLzAtBgkq"
            + "hkiG9w0BCQEWIGZlZWRiYWNrLWNyeXB0b0Bib3VuY3ljYXN0bGUub3JnMB4XDTEzMDIyNTA1NDcyOFoXDTEzMDIyNT"
            + "A1NDkwOFowgY8xCzAJBgNVBAYTAkFVMSgwJgYDVQQKDB9UaGUgTGVnaW9uIG9mIHRoZSBCb3VuY3kgQ2FzdGxlMRIw"
            + "EAYDVQQHDAlNZWxib3VybmUxETAPBgNVBAgMCFZpY3RvcmlhMS8wLQYJKoZIhvcNAQkBFiBmZWVkYmFjay1jcnlwdG"
            + "9AYm91bmN5Y2FzdGxlLm9yZzBaMA0GCSqGSIb3DQEBAQUAA0kAMEYCQQC0p+RhcFdPFqlwgrIr5YtqKmKXmEGb4Shy"
            + "pL26Ymz66ZAPdqv7EhOdzl3lZWT6srZUMWWgQMYGiHQg4z2R7X7XAgERo0QwQjAOBgNVHQ8BAf8EBAMCAAEwEgYDVR"
            + "0lAQH/BAgwBgYEVR0lADAcBgNVHREBAf8EEjAQgQ50ZXN0QHRlc3QudGVzdDANBgkqhkiG9w0BAQQFAANBAJg55PBS"
            + "weg6obRUKF4FF6fCrWFi6oCYSQ99LWcAeupc5BofW5MstFMhCOaEucuGVqunwT5G7/DweazzCIrSzB0=");

    static String fingerprint(org.bouncycastle.asn1.x509.Certificate c)
        throws IOException
    {
        byte[] der = c.getEncoded();
        byte[] sha1 = sha256DigestOf(der);
        byte[] hexBytes = Hex.encode(sha1);
        String hex = new String(hexBytes, "ASCII").toUpperCase();

        StringBuffer fp = new StringBuffer();
        int i = 0;
        fp.append(hex.substring(i, i + 2));
        while ((i += 2) < hex.length())
        {
            fp.append(':');
            fp.append(hex.substring(i, i + 2));
        }
        return fp.toString();
    }

    static byte[] sha256DigestOf(byte[] input)
    {
        SHA256Digest d = new SHA256Digest();
        d.update(input, 0, input.length);
        byte[] result = new byte[d.getDigestSize()];
        d.doFinal(result, 0);
        return result;
    }

    static TlsAgreementCredentials loadAgreementCredentials(TlsContext context,
        String[] certResources, String keyResource)
        throws IOException
    {
        Certificate certificate = loadCertificateChain(certResources);
        AsymmetricKeyParameter privateKey = loadPrivateKeyResource(keyResource);

        return new DefaultTlsAgreementCredentials(certificate, privateKey);
    }

    static TlsEncryptionCredentials loadEncryptionCredentials(TlsContext context,
        String[] certResources, String keyResource)
        throws IOException
    {
        Certificate certificate = loadCertificateChain(certResources);
        AsymmetricKeyParameter privateKey = loadPrivateKeyResource(keyResource);

        return new DefaultTlsEncryptionCredentials(context, certificate, privateKey);
    }

    static TlsSignerCredentials loadSignerCredentials(TlsContext context, String[] certResources,
        String keyResource, SignatureAndHashAlgorithm signatureAndHashAlgorithm)
        throws IOException
    {
        Certificate certificate = loadCertificateChain(certResources);
        AsymmetricKeyParameter privateKey = loadPrivateKeyResource(keyResource);

        return new DefaultTlsSignerCredentials(context, certificate, privateKey, signatureAndHashAlgorithm);
    }

    static Certificate loadCertificateChain(String[] resources)
        throws IOException
    {
        org.bouncycastle.asn1.x509.Certificate[] chain = new org.bouncycastle.asn1.x509.Certificate[resources.length];
        for (int i = 0; i < resources.length; ++i)
        {
            chain[i] = loadCertificateResource(resources[i]);
        }
        return new Certificate(chain);
    }

    static org.bouncycastle.asn1.x509.Certificate loadCertificateResource(String resource)
        throws IOException
    {
        PemObject pem = loadPemResource(resource);
        if (pem.getType().endsWith("CERTIFICATE"))
        {
            return org.bouncycastle.asn1.x509.Certificate.getInstance(pem.getContent());
        }
        throw new IllegalArgumentException("'resource' doesn't specify a valid certificate");
    }

    static AsymmetricKeyParameter loadPrivateKeyResource(String resource)
        throws IOException
    {
        PemObject pem = loadPemResource(resource);
        if (pem.getType().endsWith("RSA PRIVATE KEY"))
        {
            RSAPrivateKey rsa = RSAPrivateKey.getInstance(pem.getContent());
            return new RSAPrivateCrtKeyParameters(rsa.getModulus(), rsa.getPublicExponent(),
                rsa.getPrivateExponent(), rsa.getPrime1(), rsa.getPrime2(), rsa.getExponent1(),
                rsa.getExponent2(), rsa.getCoefficient());
        }
        if (pem.getType().endsWith("PRIVATE KEY"))
        {
            return PrivateKeyFactory.createKey(pem.getContent());
        }
        throw new IllegalArgumentException("'resource' doesn't specify a valid private key");
    }

    static PemObject loadPemResource(String resource)
        throws IOException
    {
        InputStream s = TlsTestUtils.class.getResourceAsStream(resource);
        PemReader p = new PemReader(new InputStreamReader(s));
        PemObject o = p.readPemObject();
        p.close();
        return o;
    }
}