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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 to JDK 1.8. 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.cms;

import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.cms.OtherRevocationInfoFormat;
import org.bouncycastle.asn1.cryptopro.CryptoProObjectIdentifiers;
import org.bouncycastle.asn1.eac.EACObjectIdentifiers;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.teletrust.TeleTrusTObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.AttributeCertificate;
import org.bouncycastle.asn1.x509.Certificate;
import org.bouncycastle.asn1.x509.CertificateList;
import org.bouncycastle.asn1.x509.X509ObjectIdentifiers;
import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
import org.bouncycastle.cert.X509AttributeCertificateHolder;
import org.bouncycastle.cert.X509CRLHolder;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.util.CollectionStore;
import org.bouncycastle.util.Store;

class CMSSignedHelper
{
    static final CMSSignedHelper INSTANCE = new CMSSignedHelper();

    private static final Map     encryptionAlgs = new HashMap();
    private static final Map     digestAlgs = new HashMap();
    private static final Map     digestAliases = new HashMap();

    private static void addEntries(ASN1ObjectIdentifier alias, String digest, String encryption)
    {
        digestAlgs.put(alias.getId(), digest);
        encryptionAlgs.put(alias.getId(), encryption);
    }

    static
    {
        addEntries(NISTObjectIdentifiers.dsa_with_sha224, "SHA224", "DSA");
        addEntries(NISTObjectIdentifiers.dsa_with_sha256, "SHA256", "DSA");
        addEntries(NISTObjectIdentifiers.dsa_with_sha384, "SHA384", "DSA");
        addEntries(NISTObjectIdentifiers.dsa_with_sha512, "SHA512", "DSA");
        addEntries(OIWObjectIdentifiers.dsaWithSHA1, "SHA1", "DSA");
        addEntries(OIWObjectIdentifiers.md4WithRSA, "MD4", "RSA");
        addEntries(OIWObjectIdentifiers.md4WithRSAEncryption, "MD4", "RSA");
        addEntries(OIWObjectIdentifiers.md5WithRSA, "MD5", "RSA");
        addEntries(OIWObjectIdentifiers.sha1WithRSA, "SHA1", "RSA");
        addEntries(PKCSObjectIdentifiers.md2WithRSAEncryption, "MD2", "RSA");
        addEntries(PKCSObjectIdentifiers.md4WithRSAEncryption, "MD4", "RSA");
        addEntries(PKCSObjectIdentifiers.md5WithRSAEncryption, "MD5", "RSA");
        addEntries(PKCSObjectIdentifiers.sha1WithRSAEncryption, "SHA1", "RSA");
        addEntries(PKCSObjectIdentifiers.sha224WithRSAEncryption, "SHA224", "RSA");
        addEntries(PKCSObjectIdentifiers.sha256WithRSAEncryption, "SHA256", "RSA");
        addEntries(PKCSObjectIdentifiers.sha384WithRSAEncryption, "SHA384", "RSA");
        addEntries(PKCSObjectIdentifiers.sha512WithRSAEncryption, "SHA512", "RSA");
        addEntries(X9ObjectIdentifiers.ecdsa_with_SHA1, "SHA1", "ECDSA");
        addEntries(X9ObjectIdentifiers.ecdsa_with_SHA224, "SHA224", "ECDSA");
        addEntries(X9ObjectIdentifiers.ecdsa_with_SHA256, "SHA256", "ECDSA");
        addEntries(X9ObjectIdentifiers.ecdsa_with_SHA384, "SHA384", "ECDSA");
        addEntries(X9ObjectIdentifiers.ecdsa_with_SHA512, "SHA512", "ECDSA");
        addEntries(X9ObjectIdentifiers.id_dsa_with_sha1, "SHA1", "DSA");
        addEntries(EACObjectIdentifiers.id_TA_ECDSA_SHA_1, "SHA1", "ECDSA");
        addEntries(EACObjectIdentifiers.id_TA_ECDSA_SHA_224, "SHA224", "ECDSA");
        addEntries(EACObjectIdentifiers.id_TA_ECDSA_SHA_256, "SHA256", "ECDSA");
        addEntries(EACObjectIdentifiers.id_TA_ECDSA_SHA_384, "SHA384", "ECDSA");
        addEntries(EACObjectIdentifiers.id_TA_ECDSA_SHA_512, "SHA512", "ECDSA");
        addEntries(EACObjectIdentifiers.id_TA_RSA_v1_5_SHA_1, "SHA1", "RSA");
        addEntries(EACObjectIdentifiers.id_TA_RSA_v1_5_SHA_256, "SHA256", "RSA");
        addEntries(EACObjectIdentifiers.id_TA_RSA_PSS_SHA_1, "SHA1", "RSAandMGF1");
        addEntries(EACObjectIdentifiers.id_TA_RSA_PSS_SHA_256, "SHA256", "RSAandMGF1");

        encryptionAlgs.put(X9ObjectIdentifiers.id_dsa.getId(), "DSA");
        encryptionAlgs.put(PKCSObjectIdentifiers.rsaEncryption.getId(), "RSA");
        encryptionAlgs.put(TeleTrusTObjectIdentifiers.teleTrusTRSAsignatureAlgorithm, "RSA");
        encryptionAlgs.put(X509ObjectIdentifiers.id_ea_rsa.getId(), "RSA");
        encryptionAlgs.put(CMSSignedDataGenerator.ENCRYPTION_RSA_PSS, "RSAandMGF1");
        encryptionAlgs.put(CryptoProObjectIdentifiers.gostR3410_94.getId(), "GOST3410");
        encryptionAlgs.put(CryptoProObjectIdentifiers.gostR3410_2001.getId(), "ECGOST3410");
        encryptionAlgs.put("1.3.6.1.4.1.5849.1.6.2", "ECGOST3410");
        encryptionAlgs.put("1.3.6.1.4.1.5849.1.1.5", "GOST3410");
        encryptionAlgs.put(CryptoProObjectIdentifiers.gostR3411_94_with_gostR3410_2001.getId(), "ECGOST3410");
        encryptionAlgs.put(CryptoProObjectIdentifiers.gostR3411_94_with_gostR3410_94.getId(), "GOST3410");

        digestAlgs.put(PKCSObjectIdentifiers.md2.getId(), "MD2");
        digestAlgs.put(PKCSObjectIdentifiers.md4.getId(), "MD4");
        digestAlgs.put(PKCSObjectIdentifiers.md5.getId(), "MD5");
        digestAlgs.put(OIWObjectIdentifiers.idSHA1.getId(), "SHA1");
        digestAlgs.put(NISTObjectIdentifiers.id_sha224.getId(), "SHA224");
        digestAlgs.put(NISTObjectIdentifiers.id_sha256.getId(), "SHA256");
        digestAlgs.put(NISTObjectIdentifiers.id_sha384.getId(), "SHA384");
        digestAlgs.put(NISTObjectIdentifiers.id_sha512.getId(), "SHA512");
        digestAlgs.put(TeleTrusTObjectIdentifiers.ripemd128.getId(), "RIPEMD128");
        digestAlgs.put(TeleTrusTObjectIdentifiers.ripemd160.getId(), "RIPEMD160");
        digestAlgs.put(TeleTrusTObjectIdentifiers.ripemd256.getId(), "RIPEMD256");
        digestAlgs.put(CryptoProObjectIdentifiers.gostR3411.getId(),  "GOST3411");
        digestAlgs.put("1.3.6.1.4.1.5849.1.2.1",  "GOST3411");

        digestAliases.put("SHA1", new String[] { "SHA-1" });
        digestAliases.put("SHA224", new String[] { "SHA-224" });
        digestAliases.put("SHA256", new String[] { "SHA-256" });
        digestAliases.put("SHA384", new String[] { "SHA-384" });
        digestAliases.put("SHA512", new String[] { "SHA-512" });
    }


    /**
     * Return the digest encryption algorithm using one of the standard
     * JCA string representations rather the the algorithm identifier (if
     * possible).
     */
    String getEncryptionAlgName(
        String encryptionAlgOID)
    {
        String algName = (String)encryptionAlgs.get(encryptionAlgOID);

        if (algName != null)
        {
            return algName;
        }

        return encryptionAlgOID;
    }

    AlgorithmIdentifier fixAlgID(AlgorithmIdentifier algId)
    {
        if (algId.getParameters() == null)
        {
            return new AlgorithmIdentifier(algId.getAlgorithm(), DERNull.INSTANCE);
        }

        return algId;
    }

    void setSigningEncryptionAlgorithmMapping(ASN1ObjectIdentifier oid, String algorithmName)
    {
        encryptionAlgs.put(oid.getId(), algorithmName);
    }

    void setSigningDigestAlgorithmMapping(ASN1ObjectIdentifier oid, String algorithmName)
    {
        digestAlgs.put(oid.getId(), algorithmName);
    }

    Store getCertificates(ASN1Set certSet)
    {
        if (certSet != null)
        {
            List certList = new ArrayList(certSet.size());

            for (Enumeration en = certSet.getObjects(); en.hasMoreElements();)
            {
                ASN1Primitive obj = ((ASN1Encodable)en.nextElement()).toASN1Primitive();

                if (obj instanceof ASN1Sequence)
                {
                    certList.add(new X509CertificateHolder(Certificate.getInstance(obj)));
                }
            }

            return new CollectionStore(certList);
        }

        return new CollectionStore(new ArrayList());
    }

    Store getAttributeCertificates(ASN1Set certSet)
    {
        if (certSet != null)
        {
            List certList = new ArrayList(certSet.size());

            for (Enumeration en = certSet.getObjects(); en.hasMoreElements();)
            {
                ASN1Primitive obj = ((ASN1Encodable)en.nextElement()).toASN1Primitive();

                if (obj instanceof ASN1TaggedObject)
                {
                    certList.add(new X509AttributeCertificateHolder(AttributeCertificate.getInstance(((ASN1TaggedObject)obj).getObject())));
                }
            }

            return new CollectionStore(certList);
        }

        return new CollectionStore(new ArrayList());
    }

    Store getCRLs(ASN1Set crlSet)
    {
        if (crlSet != null)
        {
            List crlList = new ArrayList(crlSet.size());

            for (Enumeration en = crlSet.getObjects(); en.hasMoreElements();)
            {
                ASN1Primitive obj = ((ASN1Encodable)en.nextElement()).toASN1Primitive();

                if (obj instanceof ASN1Sequence)
                {
                    crlList.add(new X509CRLHolder(CertificateList.getInstance(obj)));
                }
            }

            return new CollectionStore(crlList);
        }

        return new CollectionStore(new ArrayList());
    }

    Store getOtherRevocationInfo(ASN1ObjectIdentifier otherRevocationInfoFormat, ASN1Set crlSet)
    {
        if (crlSet != null)
        {
            List    crlList = new ArrayList(crlSet.size());

            for (Enumeration en = crlSet.getObjects(); en.hasMoreElements();)
            {
                ASN1Primitive obj = ((ASN1Encodable)en.nextElement()).toASN1Primitive();

                if (obj instanceof ASN1TaggedObject)
                {
                    ASN1TaggedObject tObj = ASN1TaggedObject.getInstance(obj);

                    if (tObj.getTagNo() == 1)
                    {
                        OtherRevocationInfoFormat other = OtherRevocationInfoFormat.getInstance(tObj, false);

                        if (otherRevocationInfoFormat.equals(other.getInfoFormat()))
                        {
                            crlList.add(other.getInfo());
                        }
                    }
                }
            }

            return new CollectionStore(crlList);
        }

        return new CollectionStore(new ArrayList());
    }
}




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