org.bouncycastle.pkcs.jcajce.JcePKCSPBEOutputEncryptorBuilder Maven / Gradle / Ivy
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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.Cipher;
import javax.crypto.CipherOutputStream;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.bc.BCObjectIdentifiers;
import org.bouncycastle.asn1.misc.MiscObjectIdentifiers;
import org.bouncycastle.asn1.misc.ScryptParams;
import org.bouncycastle.asn1.pkcs.EncryptionScheme;
import org.bouncycastle.asn1.pkcs.KeyDerivationFunc;
import org.bouncycastle.asn1.pkcs.PBES2Parameters;
import org.bouncycastle.asn1.pkcs.PBKDF2Params;
import org.bouncycastle.asn1.pkcs.PKCS12PBEParams;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.crypto.util.PBKDF2Config;
import org.bouncycastle.crypto.util.PBKDFConfig;
import org.bouncycastle.crypto.util.ScryptConfig;
import org.bouncycastle.jcajce.PKCS12KeyWithParameters;
import org.bouncycastle.jcajce.spec.ScryptKeySpec;
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.DefaultSecretKeySizeProvider;
import org.bouncycastle.operator.GenericKey;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.OutputEncryptor;
import org.bouncycastle.operator.SecretKeySizeProvider;
public class JcePKCSPBEOutputEncryptorBuilder
{
private final PBKDFConfig pbkdf;
private JcaJceHelper helper = new DefaultJcaJceHelper();
private ASN1ObjectIdentifier algorithm;
private ASN1ObjectIdentifier keyEncAlgorithm;
private SecureRandom random;
private SecretKeySizeProvider keySizeProvider = DefaultSecretKeySizeProvider.INSTANCE;
private int iterationCount = 1024;
private PBKDF2Config.Builder pbkdfBuilder = new PBKDF2Config.Builder();
public JcePKCSPBEOutputEncryptorBuilder(ASN1ObjectIdentifier keyEncryptionAlg)
{
this.pbkdf = null;
if (isPKCS12(keyEncryptionAlg))
{
this.algorithm = keyEncryptionAlg;
this.keyEncAlgorithm = keyEncryptionAlg;
}
else
{
this.algorithm = PKCSObjectIdentifiers.id_PBES2;
this.keyEncAlgorithm = keyEncryptionAlg;
}
}
/**
* Constructor allowing different derivation functions such as PBKDF2 and scrypt.
*
* @param pbkdfAlgorithm key derivation algorithm definition to use.
* @param keyEncryptionAlg encryption algorithm to apply the derived key with.
*/
public JcePKCSPBEOutputEncryptorBuilder(PBKDFConfig pbkdfAlgorithm, ASN1ObjectIdentifier keyEncryptionAlg)
{
this.algorithm = PKCSObjectIdentifiers.id_PBES2;
this.pbkdf = pbkdfAlgorithm;
this.keyEncAlgorithm = keyEncryptionAlg;
}
public JcePKCSPBEOutputEncryptorBuilder setProvider(Provider provider)
{
this.helper = new ProviderJcaJceHelper(provider);
return this;
}
public JcePKCSPBEOutputEncryptorBuilder setProvider(String providerName)
{
this.helper = new NamedJcaJceHelper(providerName);
return this;
}
public JcePKCSPBEOutputEncryptorBuilder setRandom(SecureRandom random)
{
this.random = random;
return this;
}
/**
* Set the lookup provider of AlgorithmIdentifier returning key_size_in_bits used to
* handle PKCS5 decryption.
*
* @param keySizeProvider a provider of integer secret key sizes.
* @return the current builder.
*/
public JcePKCSPBEOutputEncryptorBuilder setKeySizeProvider(SecretKeySizeProvider keySizeProvider)
{
this.keySizeProvider = keySizeProvider;
return this;
}
/**
* Set the PRF to use for key generation. By default this is HmacSHA1.
*
* @param prf algorithm id for PRF.
* @return the current builder.
* @throws IllegalStateException if this builder was intialised with a PBKDFDef
*/
public JcePKCSPBEOutputEncryptorBuilder setPRF(AlgorithmIdentifier prf)
{
if (pbkdf != null)
{
throw new IllegalStateException("set PRF count using PBKDFDef");
}
this.pbkdfBuilder.withPRF(prf);
return this;
}
/**
* Set the iteration count for the PBE calculation.
*
* @param iterationCount the iteration count to apply to the key creation.
* @return the current builder.
* @throws IllegalStateException if this builder was intialised with a PBKDFDef
*/
public JcePKCSPBEOutputEncryptorBuilder setIterationCount(int iterationCount)
{
if (pbkdf != null)
{
throw new IllegalStateException("set iteration count using PBKDFDef");
}
this.iterationCount = iterationCount;
this.pbkdfBuilder.withIterationCount(iterationCount);
return this;
}
public OutputEncryptor build(final char[] password)
throws OperatorCreationException
{
final Cipher cipher;
SecretKey key;
if (random == null)
{
random = new SecureRandom();
}
final AlgorithmIdentifier encryptionAlg;
try
{
if (isPKCS12(algorithm))
{
byte[] salt = new byte[20];
random.nextBytes(salt);
cipher = helper.createCipher(algorithm.getId());
cipher.init(Cipher.ENCRYPT_MODE, new PKCS12KeyWithParameters(password, salt, iterationCount));
encryptionAlg = new AlgorithmIdentifier(algorithm, new PKCS12PBEParams(salt, iterationCount));
}
else if (algorithm.equals(PKCSObjectIdentifiers.id_PBES2))
{
PBKDFConfig pbkDef = (pbkdf == null) ? pbkdfBuilder.build() : pbkdf;
if (MiscObjectIdentifiers.id_scrypt.equals(pbkDef.getAlgorithm()))
{
ScryptConfig skdf = (ScryptConfig)pbkDef;
byte[] salt = new byte[skdf.getSaltLength()];
random.nextBytes(salt);
ScryptParams params = new ScryptParams(
salt,
skdf.getCostParameter(),
skdf.getBlockSize(),
skdf.getParallelizationParameter());
SecretKeyFactory keyFact = helper.createSecretKeyFactory("SCRYPT");
key = keyFact.generateSecret(new ScryptKeySpec(password,
salt, skdf.getCostParameter(), skdf.getBlockSize(), skdf.getParallelizationParameter(),
keySizeProvider.getKeySize(new AlgorithmIdentifier(keyEncAlgorithm))));
cipher = helper.createCipher(keyEncAlgorithm.getId());
cipher.init(Cipher.ENCRYPT_MODE, key, random);
PBES2Parameters algParams = new PBES2Parameters(
new KeyDerivationFunc(MiscObjectIdentifiers.id_scrypt, params),
new EncryptionScheme(keyEncAlgorithm, ASN1Primitive.fromByteArray(cipher.getParameters().getEncoded())));
encryptionAlg = new AlgorithmIdentifier(algorithm, algParams);
}
else
{
PBKDF2Config pkdf = (PBKDF2Config)pbkDef;
byte[] salt = new byte[pkdf.getSaltLength()];
random.nextBytes(salt);
SecretKeyFactory keyFact = helper.createSecretKeyFactory(JceUtils.getAlgorithm(pkdf.getPRF().getAlgorithm()));
key = keyFact.generateSecret(new PBEKeySpec(password, salt, pkdf.getIterationCount(),
keySizeProvider.getKeySize(new AlgorithmIdentifier(keyEncAlgorithm))));
cipher = helper.createCipher(keyEncAlgorithm.getId());
cipher.init(Cipher.ENCRYPT_MODE, key, random);
PBES2Parameters algParams = new PBES2Parameters(
new KeyDerivationFunc(PKCSObjectIdentifiers.id_PBKDF2, new PBKDF2Params(salt, pkdf.getIterationCount(), pkdf.getPRF())),
new EncryptionScheme(keyEncAlgorithm, ASN1Primitive.fromByteArray(cipher.getParameters().getEncoded())));
encryptionAlg = new AlgorithmIdentifier(algorithm, algParams);
}
}
else
{
throw new OperatorCreationException("unrecognised algorithm");
}
return new OutputEncryptor()
{
public AlgorithmIdentifier getAlgorithmIdentifier()
{
return encryptionAlg;
}
public OutputStream getOutputStream(OutputStream out)
{
return new CipherOutputStream(out, cipher);
}
public GenericKey getKey()
{
if (isPKCS12(encryptionAlg.getAlgorithm()))
{
return new GenericKey(encryptionAlg, PKCS12PasswordToBytes(password));
}
else
{
return new GenericKey(encryptionAlg, PKCS5PasswordToBytes(password));
}
}
};
}
catch (Exception e)
{
throw new OperatorCreationException("unable to create OutputEncryptor: " + e.getMessage(), e);
}
}
private boolean isPKCS12(ASN1ObjectIdentifier algorithm)
{
return algorithm.on(PKCSObjectIdentifiers.pkcs_12PbeIds)
|| algorithm.on(BCObjectIdentifiers.bc_pbe_sha1_pkcs12)
|| algorithm.on(BCObjectIdentifiers.bc_pbe_sha256_pkcs12);
}
/**
* converts a password to a byte array according to the scheme in
* PKCS5 (ascii, no padding)
*
* @param password a character array representing the password.
* @return a byte array representing the password.
*/
private static byte[] PKCS5PasswordToBytes(
char[] password)
{
if (password != null)
{
byte[] bytes = new byte[password.length];
for (int i = 0; i != bytes.length; i++)
{
bytes[i] = (byte)password[i];
}
return bytes;
}
else
{
return new byte[0];
}
}
/**
* converts a password to a byte array according to the scheme in
* PKCS12 (unicode, big endian, 2 zero pad bytes at the end).
*
* @param password a character array representing the password.
* @return a byte array representing the password.
*/
private static byte[] PKCS12PasswordToBytes(
char[] password)
{
if (password != null && password.length > 0)
{
// +1 for extra 2 pad bytes.
byte[] bytes = new byte[(password.length + 1) * 2];
for (int i = 0; i != password.length; i++)
{
bytes[i * 2] = (byte)(password[i] >>> 8);
bytes[i * 2 + 1] = (byte)password[i];
}
return bytes;
}
else
{
return new byte[0];
}
}
}
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