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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.
package org.bouncycastle.pkcs.jcajce;
import java.io.OutputStream;
import java.security.Provider;
import java.security.SecureRandom;
import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PBKDF2Params;
import org.bouncycastle.asn1.pkcs.PBMAC1Params;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.jcajce.io.MacOutputStream;
import org.bouncycastle.jcajce.spec.PBKDF2KeySpec;
import org.bouncycastle.jcajce.util.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.util.JcaJceHelper;
import org.bouncycastle.jcajce.util.NamedJcaJceHelper;
import org.bouncycastle.jcajce.util.ProviderJcaJceHelper;
import org.bouncycastle.operator.DefaultMacAlgorithmIdentifierFinder;
import org.bouncycastle.operator.GenericKey;
import org.bouncycastle.operator.MacAlgorithmIdentifierFinder;
import org.bouncycastle.operator.MacCalculator;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.util.BigIntegers;
/**
* A builder for RFC 8018 PBE based MAC calculators.
*
* By default the class uses HMAC-SHA256 as the PRF, with an iteration count of 8192. The default salt length
* is the output size of the MAC being used.
*
*/
public class JcePBMac1CalculatorBuilder
{
public static final AlgorithmIdentifier PRF_SHA224 = new AlgorithmIdentifier(PKCSObjectIdentifiers.id_hmacWithSHA224, DERNull.INSTANCE);
public static final AlgorithmIdentifier PRF_SHA256 = new AlgorithmIdentifier(PKCSObjectIdentifiers.id_hmacWithSHA256, DERNull.INSTANCE);
public static final AlgorithmIdentifier PRF_SHA384 = new AlgorithmIdentifier(PKCSObjectIdentifiers.id_hmacWithSHA384, DERNull.INSTANCE);
public static final AlgorithmIdentifier PRF_SHA512 = new AlgorithmIdentifier(PKCSObjectIdentifiers.id_hmacWithSHA512, DERNull.INSTANCE);
public static final AlgorithmIdentifier PRF_SHA3_224 = new AlgorithmIdentifier(NISTObjectIdentifiers.id_hmacWithSHA3_224);
public static final AlgorithmIdentifier PRF_SHA3_256 = new AlgorithmIdentifier(NISTObjectIdentifiers.id_hmacWithSHA3_256);
public static final AlgorithmIdentifier PRF_SHA3_384 = new AlgorithmIdentifier(NISTObjectIdentifiers.id_hmacWithSHA3_384);
public static final AlgorithmIdentifier PRF_SHA3_512 = new AlgorithmIdentifier(NISTObjectIdentifiers.id_hmacWithSHA3_512);
private static final DefaultMacAlgorithmIdentifierFinder defaultFinder = new DefaultMacAlgorithmIdentifierFinder();
private JcaJceHelper helper = new DefaultJcaJceHelper();
private AlgorithmIdentifier macAlgorithm;
private SecureRandom random;
private int saltLength = -1;
private int iterationCount = 8192;
private int keySize;
private PBKDF2Params pbeParams = null;
private AlgorithmIdentifier prf = PRF_SHA256;
private byte[] salt = null;
/**
* Base constructor - MAC name and key size.
*
* @param macAlgorithm name of the MAC algorithm.
* @param keySize the key size in bits.
*/
public JcePBMac1CalculatorBuilder(String macAlgorithm, int keySize)
{
this(macAlgorithm, keySize, defaultFinder);
}
/**
* Base constructor - MAC name and key size with a custom AlgorithmIdentifier finder for the MAC algorithm.
*
* @param macAlgorithm name of the MAC algorithm.
* @param keySize the key size in bits.
* @param algIdFinder an AlgorithmIdentifier finder containing the specified MAC name.
*/
public JcePBMac1CalculatorBuilder(String macAlgorithm, int keySize, MacAlgorithmIdentifierFinder algIdFinder)
{
this.macAlgorithm = algIdFinder.find(macAlgorithm);
this.keySize = keySize;
}
/**
* Base constructor from an ASN.1 parameter set. See RFC 8108 for details.
*
* @param pbeMacParams the ASN.1 parameters for the MAC calculator we want to create.
*/
public JcePBMac1CalculatorBuilder(PBMAC1Params pbeMacParams)
{
this.macAlgorithm = pbeMacParams.getMessageAuthScheme();
// TODO validate PBE scheme
this.pbeParams = PBKDF2Params.getInstance(pbeMacParams.getKeyDerivationFunc().getParameters());
}
public JcePBMac1CalculatorBuilder setProvider(Provider provider)
{
this.helper = new ProviderJcaJceHelper(provider);
return this;
}
public JcePBMac1CalculatorBuilder setProvider(String providerName)
{
this.helper = new NamedJcaJceHelper(providerName);
return this;
}
JcePBMac1CalculatorBuilder setHelper(JcaJceHelper helper)
{
this.helper = helper;
return this;
}
public JcePBMac1CalculatorBuilder setIterationCount(int iterationCount)
{
this.iterationCount = iterationCount;
return this;
}
/**
* Set the length of the salt in bytes.
* @param saltLength
* @return
*/
public JcePBMac1CalculatorBuilder setSaltLength(int saltLength)
{
this.saltLength = saltLength;
return this;
}
public JcePBMac1CalculatorBuilder setSalt(byte[] salt)
{
this.salt = salt;
return this;
}
public JcePBMac1CalculatorBuilder setRandom(SecureRandom random)
{
this.random = random;
return this;
}
public JcePBMac1CalculatorBuilder setPrf(AlgorithmIdentifier prf)
{
this.prf = prf;
return this;
}
public MacCalculator build(final char[] password)
throws OperatorCreationException
{
if (random == null)
{
random = new SecureRandom();
}
try
{
final Mac mac = helper.createMac(macAlgorithm.getAlgorithm().getId());
if (pbeParams == null)
{
if (salt == null)
{
if (saltLength < 0)
{
saltLength = mac.getMacLength();
}
salt = new byte[saltLength];
random.nextBytes(salt);
}
}
else
{
salt = pbeParams.getSalt();
iterationCount = BigIntegers.intValueExact(pbeParams.getIterationCount());
keySize = BigIntegers.intValueExact(pbeParams.getKeyLength()) * 8;
}
SecretKeyFactory secFact = helper.createSecretKeyFactory("PBKDF2");
final SecretKey key = secFact.generateSecret(new PBKDF2KeySpec(password, salt, iterationCount, keySize, prf));
mac.init(key);
return new MacCalculator()
{
public AlgorithmIdentifier getAlgorithmIdentifier()
{
return new AlgorithmIdentifier(PKCSObjectIdentifiers.id_PBMAC1,
new PBMAC1Params(
new AlgorithmIdentifier(PKCSObjectIdentifiers.id_PBES2, new PBKDF2Params(salt, iterationCount, (keySize + 7) / 8, prf)),
macAlgorithm));
}
public OutputStream getOutputStream()
{
return new MacOutputStream(mac);
}
public byte[] getMac()
{
return mac.doFinal();
}
public GenericKey getKey()
{
return new GenericKey(getAlgorithmIdentifier(), key.getEncoded());
}
};
}
catch (Exception e)
{
throw new OperatorCreationException("unable to create MAC calculator: " + e.getMessage(), e);
}
}
}