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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.
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package org.bouncycastle.pkcs.test;

import java.math.BigInteger;
import java.security.Security;

import junit.framework.TestCase;
import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.EncryptedPrivateKeyInfo;
import org.bouncycastle.asn1.pkcs.PBES2Parameters;
import org.bouncycastle.asn1.pkcs.PBKDF2Params;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.pkcs.RSAPrivateKey;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.crypto.util.PBKDFConfig;
import org.bouncycastle.crypto.util.ScryptConfig;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.pkcs.PKCS8EncryptedPrivateKeyInfo;
import org.bouncycastle.pkcs.PKCS8EncryptedPrivateKeyInfoBuilder;
import org.bouncycastle.pkcs.jcajce.JcePKCSPBEInputDecryptorProviderBuilder;
import org.bouncycastle.pkcs.jcajce.JcePKCSPBEOutputEncryptorBuilder;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.encoders.Base64;

public class PKCS8Test
    extends TestCase
{
    private static BigInteger modulus = new BigInteger(
        "b6ce33ccbf839457b0d32487b6c807bca584f85c627466b787fc09d0b1f73d97c9a381eca20e0ba851d317a8964327fa0010de76c" +
            "6c0facb83f13612752d166b49d9ba272c38c9a4ed71a94ea69f7bbdc63d7a5c5d3f3c039223e4ac1bb5d433c6bf01e68364a7ef4f" +
            "061f7cdfba82fa471bb1444b2034e53cc9c3e402a8fa89", 16);

    private static byte[] pkInfo = Base64.decode(
        "MIICdgIBADANBgkqhkiG9w0BAQEFAASCAmAwggJcAgEAAoGBALbOM8y/g5RXsNMkh7bIB7ylhPhcYnRmt4f8CdCx9z2XyaOB7KIOC6hR" +
            "0xeolkMn+gAQ3nbGwPrLg/E2EnUtFmtJ2bonLDjJpO1xqU6mn3u9xj16XF0/PAOSI+SsG7XUM8a/AeaDZKfvTwYffN+6gvpHG7FESyA0" +
            "5TzJw+QCqPqJAgMBAAECgYAMQxCeb0o4LRmjUBP6YriCIugkcK35+NneuT0/TnCzJPdVjGV/CUom5DYwpBJQNuJCFt+VQAe5yuTyzRm3" +
            "2mpicusxKsMHqJRJFWIQ5ztuRehGF1KB+NPze7GxWVB2vRWJQQhlgq/nRsAjWoUfxbFkKBlNPhUnLm1klwBptpqpcQJBAOBiAnrrraBu" +
            "3Lc9B8QtCdEAIr5LYyWYd3jSvyTt04OI8Q3l7zG9omKpdIskGNu7n5RRYixsNXAVCaiHsyHHCO8CQQDQkGdtlH5fQZ2PJVSNZ6RlDhUq" +
            "6RGqajnkXw/sK1GR388FGqc9xTB9Eu1vg7ywlsuWSWpiCe/q+1nGVJufLAQHAkEAyTba5oQGNYJ1J1Txa/i/fs7SWTedd49cQ9spUeJ7" +
            "9M6O7FmvwDlAL52qR0Rdjl6YYhcBJLj8yr/y41CdUML9vQJAYGDqurOtNj2vHrAkg3fKezxnwb2UgUi3WfYn+H4IIr3m/7fSYvQVtSai" +
            "/C5Hat80U0230HhBGzhtwv3kMEj5zwJAViD4ceQRYyC+G2z5fyFz8Ca6sjDB9LwY0YEOFxR+3nqtteJI2vgITl4HrrnTRGuiVSY6pqkX" +
            "hX2DZcWDZMieLA==");

    private static byte[] pkcs8Sha256 = Base64.decode(
    "MIIC9TBvBgkqhkiG9w0BBQ0wYjBBBgkqhkiG9w0BBQwwNAQgsa99yy9MqsJQ+4l5" +
        "SehvabVidNKBoJeqPJDZAPmbKCgCAggAMAwGCCqGSIb3DQIJBQAwHQYJYIZIAWUD" +
        "BAEqBBBAncGTD5Yp0oqVklTgmzt4BIICgDJLy5EF12+l9cjYIRVLcHFc7QE7prBy" +
        "yj+nENvxqPJaVAVo+VVguOPUSGKQAeZnUhpU1kwKa4EyUhA5CvVtTcQ3hd7v769E" +
        "n59EJ2NKFNOmplxbE3QU/Z7g63ECDvu4jsUVjZmWGrzDXwDEkraG5VdtVhIfdFOj" +
        "yR1CEnxLqq5l3qlkCjKFap/UBh6wbsItJJYw4HJ/7fCJtY8xKG9b1hxHiyH2Yhrh" +
        "Pak2P4ukFClg8Kzv92ZbUKSv92C/zrlkUWx7+u7b97YZVd/nL4VLVnQW79YI7ApL" +
        "QHFNZ9Jp3cm3XtddzlJJVWwghF+slvULsGzQ05yMICyCRHEwPAPSXvf6VpNezQ+v" +
        "8mD+lS7IavJRx7S4y2NFzZCLDaZfX32/S4vRv7Q4Ax87YKHqHwLnZRLWn3QimtX5" +
        "oJPsf8Sj0/w31W49c7I3a4rWLAWO3fTVSvH+vQdPUCq9geqatOjiwSnUy6oSP4f3" +
        "vvdMlvNFafWyLwqONM8nKijNSSk8fjJtncvIDBCRYmwuQFmkFBRtCpHNeY43vrCV" +
        "O04x5N6PPTnnp/Ru7xYbrEyO2SQX/JJQV2l/pZgyF4w/2Y3i0hW+dItkoFVPGuY0" +
        "XfBgPlVx5w/72Et8GKh8a5E03IPJOa3J+/vhx9hYc7Hc4AJHsQQwiXco5ybBNZBV" +
        "wteKQwP6XRL5GMWJr4v4fJk0ksZ7sDAIlLWOeZu0jxWSx3VLC6QR9Ij+uMGkkY3t" +
        "nVxJii5qFSnWSH5e2Qk9HJ64a0ossKBFaln8wT/2tryBxa1+YZDYwGrasG4EvKHC" +
        "N0PVvCZ6nreGoWpaBlTolOl7HpbjcsryQ2SMkWNIurrivWKAoqRQ53Q=");


    private static byte[] pkcs8Gost3411 = Base64.decode(
        "MIIC8zBtBgkqhkiG9w0BBQ0wYDA/BgkqhkiG9w0BBQwwMgQgo40hf88LUYklfxUE" +
            "HO0KjJFo52p9lEqfYDDmJJosDpYCAggAMAoGBiqFAwICCgUAMB0GCWCGSAFlAwQB" +
            "KgQQJXNzoxem4QvtoToJbJVt1ASCAoBtcnpMvp/Skip+m8e0A+Hh8BnzoRDkKoeD" +
            "QFuyR1HRfXa6iZ+CT5Bt38kM7shDA1se1uEo5WnDCydmzQ5WdHinMaokryd+3l65" +
            "AszZLrbK56E78820RMTwFevDAXcwhneomCkEg059r+GfO0OLe6YJ1JR88uiPWxJy" +
            "gthltJoefOnK87cG53oOPAmgKkMS0lbd13FeYduo9r2473O80CtTpA0p5GHFHdI8" +
            "9ebu8PWoGez+HR3FU5+m4Qj63spW2F1qblgocywABFqVCWVp/8h4dptQ7754jNmK" +
            "HN4MWgXYb5SdScz8IkE9Cv+Xn0tAW5eqhgYDot4GfbYRqCjup0jnCmgNxFo/TMOS" +
            "H1EMXeFnEEEft/fx8K1jZ1jtfJQRBY1N0jOBBzsMKVgj8GYkFAlOYXziCK+YzYjY" +
            "gmD2/IQ1+VfPnCkT14BqM9KzJidOjMDE9jlMiBhaBzee0qpdCLZ9bPQ0L6s6Urwm" +
            "mR7l1nCvLY5GYRBUC/ZOZf+MiPEpD/Lu+DUv5RgPEDStSXoKqtxvgpsT4upDVpEw" +
            "i4z7TWGpkcOGZJEe8JHEw5rDC15FHm44WoeFhlgLaFhjUD9Ou4CYM3LYT6VwUbmF" +
            "XBBVuKssFbbvOcU1ez4vfx7i8r09R/olVmopsiUBapyLwfck3hlQEYrAJKHQ9HFV" +
            "qYM9tU0OoaZB1qYYmLQPIe99cr66xTmfUkRQaJ2RAhbZQDPTX3Bm4SseEfmrkfuY" +
            "/RzOT5l2cgEOuTmkzhfgxVqyhOBeWfGPWYWtDD2QmQBcAHZbf9XVaoRe7YDRXTG/" +
            "WhEN3fKJaM/Qfif5wwWvHjQb5TWrTyeNNuh4YtXsyQ3PkwOxHrmm"
    );

    // from RFC 7914
    private static byte[] pkcs8Scrypt = Base64.decode(
        "MIHiME0GCSqGSIb3DQEFDTBAMB8GCSsGAQQB2kcECzASBAVNb3VzZQIDEAAAAgEI" +
            "AgEBMB0GCWCGSAFlAwQBKgQQyYmguHMsOwzGMPoyObk/JgSBkJb47EWd5iAqJlyy" +
            "+ni5ftd6gZgOPaLQClL7mEZc2KQay0VhjZm/7MbBUNbqOAXNM6OGebXxVp6sHUAL" +
            "iBGY/Dls7B1TsWeGObE0sS1MXEpuREuloZjcsNVcNXWPlLdZtkSH6uwWzR0PyG/Z" +
            "+ZXfNodZtd/voKlvLOw5B3opGIFaLkbtLZQwMiGtl42AS89lZg=="
    );

    private static byte[] scryptKey = Base64.decode(
        "MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQg4RaNK5CuHY3CXr9f" +
            "/CdVgOhEurMohrQmWbbLZK4ZInyhRANCAARs2WMV6UMlLjLaoc0Dsdnj4Vlffc9T" +
            "t48lJU0RiCzXc280Vg/H5fm1xAP1B7UnIVcBqgDHDcfqWm1h/xSeCHXS"
    );

    public void setUp()
    {
        Security.addProvider(new BouncyCastleProvider());
    }

    public void testSHA256()
        throws Exception
    {
        PKCS8EncryptedPrivateKeyInfo info = new PKCS8EncryptedPrivateKeyInfo(pkcs8Sha256);
        
        PrivateKeyInfo pkInfo = info.decryptPrivateKeyInfo(new JcePKCSPBEInputDecryptorProviderBuilder().setProvider("BC").build("hello".toCharArray()));

        RSAPrivateKey k = RSAPrivateKey.getInstance(pkInfo.parsePrivateKey());

        assertEquals(modulus, k.getModulus());
    }

    public void testGOST3411()
        throws Exception
    {
        PKCS8EncryptedPrivateKeyInfo info = new PKCS8EncryptedPrivateKeyInfo(pkcs8Gost3411);

        PrivateKeyInfo pkInfo = info.decryptPrivateKeyInfo(new JcePKCSPBEInputDecryptorProviderBuilder().setProvider("BC").build("hello".toCharArray()));

        RSAPrivateKey k = RSAPrivateKey.getInstance(pkInfo.parsePrivateKey());

        assertEquals(modulus, k.getModulus());
    }

    public void testScrypt()
        throws Exception
    {
        if (getJvmVersion() < 7)  // runs out of memory
        {
            return;
        }
        
        PKCS8EncryptedPrivateKeyInfo info = new PKCS8EncryptedPrivateKeyInfo(pkcs8Scrypt);

        PrivateKeyInfo pkInfo = info.decryptPrivateKeyInfo(new JcePKCSPBEInputDecryptorProviderBuilder().setProvider("BC").build("Rabbit".toCharArray()));
        
        assertTrue(Arrays.areEqual(scryptKey, pkInfo.getEncoded()));
    }

    public void testSHA256Encryption()
        throws Exception
    {
        PKCS8EncryptedPrivateKeyInfoBuilder bldr = new PKCS8EncryptedPrivateKeyInfoBuilder(pkInfo);

        PKCS8EncryptedPrivateKeyInfo encInfo = bldr.build(
            new JcePKCSPBEOutputEncryptorBuilder(NISTObjectIdentifiers.id_aes256_CBC)
                .setPRF(new AlgorithmIdentifier(PKCSObjectIdentifiers.id_hmacWithSHA256, DERNull.INSTANCE))
                .setProvider("BC")
                .build("hello".toCharArray()));

        EncryptedPrivateKeyInfo encPkInfo = EncryptedPrivateKeyInfo.getInstance(encInfo.getEncoded());

        assertEquals(
            new AlgorithmIdentifier(PKCSObjectIdentifiers.id_hmacWithSHA256, DERNull.INSTANCE),
            PBKDF2Params.getInstance(
                PBES2Parameters.getInstance(encPkInfo.getEncryptionAlgorithm().getParameters())
                    .getKeyDerivationFunc().getParameters())
                .getPrf());

        PrivateKeyInfo pkInfo = encInfo.decryptPrivateKeyInfo(new JcePKCSPBEInputDecryptorProviderBuilder().setProvider("BC").build("hello".toCharArray()));

        RSAPrivateKey k = RSAPrivateKey.getInstance(pkInfo.parsePrivateKey());

        assertEquals(modulus, k.getModulus());
    }

    public void testSHA3_256Encryption()
        throws Exception
    {
        PKCS8EncryptedPrivateKeyInfoBuilder bldr = new PKCS8EncryptedPrivateKeyInfoBuilder(pkInfo);

        PKCS8EncryptedPrivateKeyInfo encInfo = bldr.build(
            new JcePKCSPBEOutputEncryptorBuilder(NISTObjectIdentifiers.id_aes256_CBC)
                .setPRF(new AlgorithmIdentifier(NISTObjectIdentifiers.id_hmacWithSHA3_256, DERNull.INSTANCE))
                .setProvider("BC")
                .build("hello".toCharArray()));

        EncryptedPrivateKeyInfo encPkInfo = EncryptedPrivateKeyInfo.getInstance(encInfo.getEncoded());

        assertEquals(
            new AlgorithmIdentifier(NISTObjectIdentifiers.id_hmacWithSHA3_256, DERNull.INSTANCE),
            PBKDF2Params.getInstance(
                PBES2Parameters.getInstance(encPkInfo.getEncryptionAlgorithm().getParameters())
                    .getKeyDerivationFunc().getParameters())
                .getPrf());

        PrivateKeyInfo pkInfo = encInfo.decryptPrivateKeyInfo(new JcePKCSPBEInputDecryptorProviderBuilder().setProvider("BC").build("hello".toCharArray()));

        RSAPrivateKey k = RSAPrivateKey.getInstance(pkInfo.parsePrivateKey());

        assertEquals(modulus, k.getModulus());
    }

    public void testKWPEncryption()
        throws Exception
    {
        PKCS8EncryptedPrivateKeyInfoBuilder bldr = new PKCS8EncryptedPrivateKeyInfoBuilder(pkInfo);

        PKCS8EncryptedPrivateKeyInfo encInfo = bldr.build(
            new JcePKCSPBEOutputEncryptorBuilder(NISTObjectIdentifiers.id_aes128_wrap_pad)
                .setPRF(new AlgorithmIdentifier(NISTObjectIdentifiers.id_hmacWithSHA3_256, DERNull.INSTANCE))
                .setProvider("BC")
                .build("hello".toCharArray()));

        EncryptedPrivateKeyInfo encPkInfo = EncryptedPrivateKeyInfo.getInstance(encInfo.getEncoded());

        assertEquals(
            new AlgorithmIdentifier(NISTObjectIdentifiers.id_hmacWithSHA3_256, DERNull.INSTANCE),
            PBKDF2Params.getInstance(
                PBES2Parameters.getInstance(encPkInfo.getEncryptionAlgorithm().getParameters())
                    .getKeyDerivationFunc().getParameters())
                .getPrf());

        PrivateKeyInfo pkInfo = encInfo.decryptPrivateKeyInfo(new JcePKCSPBEInputDecryptorProviderBuilder().setProvider("BC").build("hello".toCharArray()));

        RSAPrivateKey k = RSAPrivateKey.getInstance(pkInfo.parsePrivateKey());

        assertEquals(modulus, k.getModulus());
    }

    public void testCCMEncryption()
        throws Exception
    {
        PKCS8EncryptedPrivateKeyInfoBuilder bldr = new PKCS8EncryptedPrivateKeyInfoBuilder(pkInfo);

        PKCS8EncryptedPrivateKeyInfo encInfo = bldr.build(
            new JcePKCSPBEOutputEncryptorBuilder(NISTObjectIdentifiers.id_aes192_CCM)
                .setPRF(new AlgorithmIdentifier(NISTObjectIdentifiers.id_hmacWithSHA3_256, DERNull.INSTANCE))
                .setProvider("BC")
                .build("hello".toCharArray()));

        EncryptedPrivateKeyInfo encPkInfo = EncryptedPrivateKeyInfo.getInstance(encInfo.getEncoded());

        assertEquals(
            new AlgorithmIdentifier(NISTObjectIdentifiers.id_hmacWithSHA3_256, DERNull.INSTANCE),
            PBKDF2Params.getInstance(
                PBES2Parameters.getInstance(encPkInfo.getEncryptionAlgorithm().getParameters())
                    .getKeyDerivationFunc().getParameters())
                .getPrf());

        PrivateKeyInfo pkInfo = encInfo.decryptPrivateKeyInfo(new JcePKCSPBEInputDecryptorProviderBuilder().setProvider("BC").build("hello".toCharArray()));

        RSAPrivateKey k = RSAPrivateKey.getInstance(pkInfo.parsePrivateKey());

        assertEquals(modulus, k.getModulus());
    }

    public void testGCMEncryption()
        throws Exception
    {
        PKCS8EncryptedPrivateKeyInfoBuilder bldr = new PKCS8EncryptedPrivateKeyInfoBuilder(pkInfo);

        PKCS8EncryptedPrivateKeyInfo encInfo = bldr.build(
            new JcePKCSPBEOutputEncryptorBuilder(NISTObjectIdentifiers.id_aes256_GCM)
                .setPRF(new AlgorithmIdentifier(NISTObjectIdentifiers.id_hmacWithSHA3_256, DERNull.INSTANCE))
                .setProvider("BC")
                .build("hello".toCharArray()));

        EncryptedPrivateKeyInfo encPkInfo = EncryptedPrivateKeyInfo.getInstance(encInfo.getEncoded());

        assertEquals(
            new AlgorithmIdentifier(NISTObjectIdentifiers.id_hmacWithSHA3_256, DERNull.INSTANCE),
            PBKDF2Params.getInstance(
                PBES2Parameters.getInstance(encPkInfo.getEncryptionAlgorithm().getParameters())
                    .getKeyDerivationFunc().getParameters())
                .getPrf());

        PrivateKeyInfo pkInfo = encInfo.decryptPrivateKeyInfo(new JcePKCSPBEInputDecryptorProviderBuilder().setProvider("BC").build("hello".toCharArray()));

        RSAPrivateKey k = RSAPrivateKey.getInstance(pkInfo.parsePrivateKey());

        assertEquals(modulus, k.getModulus());
    }

    public void testScryptEncryption()
        throws Exception
    {
        if (getJvmVersion() < 7)      // runs out of memory
        {
            return;
        }

        PKCS8EncryptedPrivateKeyInfoBuilder bldr = new PKCS8EncryptedPrivateKeyInfoBuilder(scryptKey);

        PBKDFConfig scrypt = new ScryptConfig.Builder(1048576, 8, 1)
                                        .withSaltLength(20).build();

        PKCS8EncryptedPrivateKeyInfo encInfo = bldr.build(
            new JcePKCSPBEOutputEncryptorBuilder(scrypt, NISTObjectIdentifiers.id_aes256_CBC)
                .setProvider("BC")
                .build("Rabbit".toCharArray()));

        EncryptedPrivateKeyInfo encPkInfo = EncryptedPrivateKeyInfo.getInstance(encInfo.getEncoded());

        PKCS8EncryptedPrivateKeyInfo info = new PKCS8EncryptedPrivateKeyInfo(encPkInfo);

        PrivateKeyInfo pkInfo = info.decryptPrivateKeyInfo(new JcePKCSPBEInputDecryptorProviderBuilder().setProvider("BC").build("Rabbit".toCharArray()));

        assertTrue(Arrays.areEqual(scryptKey, pkInfo.getEncoded()));
    }

    private static int getJvmVersion()
    {
        String version = System.getProperty("java.version");

        if (version.startsWith("1.7"))
        {
            return 7;
        }
        if (version.startsWith("1.8"))
        {
            return 8;
        }
        if (version.startsWith("1.9"))
        {
            return 9;
        }
        if (version.startsWith("1.1"))
        {
            return 10;
        }

        return -1;
    }
}