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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.
package org.bouncycastle.crypto;
import java.math.BigInteger;
import java.security.AccessController;
import java.security.Permission;
import java.security.PrivilegedAction;
import java.security.SecureRandom;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.crypto.params.DHParameters;
import org.bouncycastle.crypto.params.DHValidationParameters;
import org.bouncycastle.crypto.params.DSAParameters;
import org.bouncycastle.crypto.params.DSAValidationParameters;
import org.bouncycastle.util.encoders.Hex;
/**
* Basic registrar class for providing defaults for cryptography services in this module.
*/
public final class CryptoServicesRegistrar
{
private static final Permission CanSetDefaultProperty = new CryptoServicesPermission(CryptoServicesPermission.GLOBAL_CONFIG);
private static final Permission CanSetThreadProperty = new CryptoServicesPermission(CryptoServicesPermission.THREAD_LOCAL_CONFIG);
private static final Permission CanSetDefaultRandom = new CryptoServicesPermission(CryptoServicesPermission.DEFAULT_RANDOM);
private static final ThreadLocal threadProperties = new ThreadLocal();
private static final Map globalProperties = Collections.synchronizedMap(new HashMap());
private static volatile SecureRandom defaultSecureRandom;
static
{
// default domain parameters for DSA and Diffie-Hellman
DSAParameters def512Params = new DSAParameters(
new BigInteger("fca682ce8e12caba26efccf7110e526db078b05edecbcd1eb4a208f3ae1617ae01f35b91a47e6df63413c5e12ed0899bcd132acd50d99151bdc43ee737592e17", 16),
new BigInteger("962eddcc369cba8ebb260ee6b6a126d9346e38c5", 16),
new BigInteger("678471b27a9cf44ee91a49c5147db1a9aaf244f05a434d6486931d2d14271b9e35030b71fd73da179069b32e2935630e1c2062354d0da20a6c416e50be794ca4", 16),
new DSAValidationParameters(Hex.decodeStrict("b869c82b35d70e1b1ff91b28e37a62ecdc34409b"), 123));
DSAParameters def768Params = new DSAParameters(
new BigInteger("e9e642599d355f37c97ffd3567120b8e25c9cd43e927b3a9670fbec5" +
"d890141922d2c3b3ad2480093799869d1e846aab49fab0ad26d2ce6a" +
"22219d470bce7d777d4a21fbe9c270b57f607002f3cef8393694cf45" +
"ee3688c11a8c56ab127a3daf", 16),
new BigInteger("9cdbd84c9f1ac2f38d0f80f42ab952e7338bf511", 16),
new BigInteger("30470ad5a005fb14ce2d9dcd87e38bc7d1b1c5facbaecbe95f190aa7" +
"a31d23c4dbbcbe06174544401a5b2c020965d8c2bd2171d366844577" +
"1f74ba084d2029d83c1c158547f3a9f1a2715be23d51ae4d3e5a1f6a" +
"7064f316933a346d3f529252", 16),
new DSAValidationParameters(Hex.decodeStrict("77d0f8c4dad15eb8c4f2f8d6726cefd96d5bb399"), 263));
DSAParameters def1024Params = new DSAParameters(
new BigInteger("fd7f53811d75122952df4a9c2eece4e7f611b7523cef4400c31e3f80" +
"b6512669455d402251fb593d8d58fabfc5f5ba30f6cb9b556cd7813b" +
"801d346ff26660b76b9950a5a49f9fe8047b1022c24fbba9d7feb7c6" +
"1bf83b57e7c6a8a6150f04fb83f6d3c51ec3023554135a169132f675" +
"f3ae2b61d72aeff22203199dd14801c7", 16),
new BigInteger("9760508f15230bccb292b982a2eb840bf0581cf5", 16),
new BigInteger("f7e1a085d69b3ddecbbcab5c36b857b97994afbbfa3aea82f9574c0b" +
"3d0782675159578ebad4594fe67107108180b449167123e84c281613" +
"b7cf09328cc8a6e13c167a8b547c8d28e0a3ae1e2bb3a675916ea37f" +
"0bfa213562f1fb627a01243bcca4f1bea8519089a883dfe15ae59f06" +
"928b665e807b552564014c3bfecf492a", 16),
new DSAValidationParameters(Hex.decodeStrict("8d5155894229d5e689ee01e6018a237e2cae64cd"), 92));
DSAParameters def2048Params = new DSAParameters(
new BigInteger("95475cf5d93e596c3fcd1d902add02f427f5f3c7210313bb45fb4d5b" +
"b2e5fe1cbd678cd4bbdd84c9836be1f31c0777725aeb6c2fc38b85f4" +
"8076fa76bcd8146cc89a6fb2f706dd719898c2083dc8d896f84062e2" +
"c9c94d137b054a8d8096adb8d51952398eeca852a0af12df83e475aa" +
"65d4ec0c38a9560d5661186ff98b9fc9eb60eee8b030376b236bc73b" +
"e3acdbd74fd61c1d2475fa3077b8f080467881ff7e1ca56fee066d79" +
"506ade51edbb5443a563927dbc4ba520086746175c8885925ebc64c6" +
"147906773496990cb714ec667304e261faee33b3cbdf008e0c3fa906" +
"50d97d3909c9275bf4ac86ffcb3d03e6dfc8ada5934242dd6d3bcca2" +
"a406cb0b", 16),
new BigInteger("f8183668ba5fc5bb06b5981e6d8b795d30b8978d43ca0ec572e37e09939a9773", 16),
new BigInteger("42debb9da5b3d88cc956e08787ec3f3a09bba5f48b889a74aaf53174" +
"aa0fbe7e3c5b8fcd7a53bef563b0e98560328960a9517f4014d3325f" +
"c7962bf1e049370d76d1314a76137e792f3f0db859d095e4a5b93202" +
"4f079ecf2ef09c797452b0770e1350782ed57ddf794979dcef23cb96" +
"f183061965c4ebc93c9c71c56b925955a75f94cccf1449ac43d586d0" +
"beee43251b0b2287349d68de0d144403f13e802f4146d882e057af19" +
"b6f6275c6676c8fa0e3ca2713a3257fd1b27d0639f695e347d8d1cf9" +
"ac819a26ca9b04cb0eb9b7b035988d15bbac65212a55239cfc7e58fa" +
"e38d7250ab9991ffbc97134025fe8ce04c4399ad96569be91a546f49" +
"78693c7a", 16),
new DSAValidationParameters(Hex.decodeStrict("b0b4417601b59cbc9d8ac8f935cadaec4f5fbb2f23785609ae466748d9b5a536"), 497));
localSetGlobalProperty(Property.DSA_DEFAULT_PARAMS, new Object[] { def512Params, def768Params, def1024Params, def2048Params });
localSetGlobalProperty(Property.DH_DEFAULT_PARAMS, new Object[] { toDH(def512Params), toDH(def768Params), toDH(def1024Params), toDH(def2048Params) });
}
private CryptoServicesRegistrar()
{
}
/**
* Return the default source of randomness.
*
* @return the default SecureRandom
* @throws IllegalStateException if no source of randomness has been provided.
*/
public static SecureRandom getSecureRandom()
{
if (defaultSecureRandom == null)
{
return new SecureRandom();
}
return defaultSecureRandom;
}
/**
* Set a default secure random to be used where none is otherwise provided.
*
* @param secureRandom the SecureRandom to use as the default.
*/
public static void setSecureRandom(SecureRandom secureRandom)
{
checkPermission(CanSetDefaultRandom);
defaultSecureRandom = secureRandom;
}
/**
* Return either the passed-in SecureRandom, or if it is null, then the default source of randomness.
*
* @param secureRandom the SecureRandom to use if it is not null.
* @return the SecureRandom parameter if it is not null, or else the default SecureRandom
*/
public static SecureRandom getSecureRandom(SecureRandom secureRandom)
{
return null == secureRandom ? getSecureRandom() : secureRandom;
}
/**
* Return the default value for a particular property if one exists. The look up is done on the thread's local
* configuration first and then on the global configuration in no local configuration exists.
*
* @param property the property to look up.
* @return null if the property is not set, the default value otherwise,
*/
public static Object getProperty(Property property)
{
Object[] values = lookupProperty(property);
if (values != null)
{
return values[0];
}
return null;
}
private static Object[] lookupProperty(Property property)
{
Map properties = (Map)threadProperties.get();
Object[] values;
if (properties == null || !properties.containsKey(property.name))
{
values = (Object[])globalProperties.get(property.name);
}
else
{
values = (Object[])properties.get(property.name);
}
return values;
}
/**
* Return an array representing the current values for a sized property such as DH_DEFAULT_PARAMS or
* DSA_DEFAULT_PARAMS.
*
* @param property the name of the property to look up.
* @param the base type of the array to be returned.
* @return null if the property is not set, an array of the current values otherwise.
*/
public static Object[] getSizedProperty(Property property)
{
Object[] values = lookupProperty(property);
if (values == null)
{
return null;
}
Object[] rv = new Object[values.length];
System.arraycopy(values, 0, rv, 0, rv.length);
return rv;
}
/**
* Return the value for a specific size for a sized property such as DH_DEFAULT_PARAMS or
* DSA_DEFAULT_PARAMS.
*
* @param property the name of the property to look up.
* @param size the size (in bits) of the defining value in the property type.
* @return the current value for the size, null if there is no value set,
*/
public static Object getSizedProperty(Property property, int size)
{
Object[] values = lookupProperty(property);
if (values == null)
{
return null;
}
if (property.type.isAssignableFrom(DHParameters.class))
{
for (int i = 0; i != values.length; i++)
{
DHParameters params = (DHParameters)values[i];
if (params.getP().bitLength() == size)
{
return params;
}
}
}
else if (property.type.isAssignableFrom(DSAParameters.class))
{
for (int i = 0; i != values.length; i++)
{
DSAParameters params = (DSAParameters)values[i];
if (params.getP().bitLength() == size)
{
return params;
}
}
}
return null;
}
/**
* Set the value of the the passed in property on the current thread only. More than
* one value can be passed in for a sized property. If more than one value is provided the
* first value in the argument list becomes the default value.
*
* @param property the name of the property to set.
* @param propertyValue the values to assign to the property.
* @param the base type of the property value.
*/
public static void setThreadProperty(Property property, Object[] propertyValue)
{
checkPermission(CanSetThreadProperty);
if (!property.type.isAssignableFrom(propertyValue[0].getClass()))
{
throw new IllegalArgumentException("Bad property value passed");
}
Object[] rv = new Object[propertyValue.length];
System.arraycopy(propertyValue, 0, rv, 0, rv.length);
localSetThread(property, rv);
}
/**
* Set the value of the the passed in property globally in the JVM. More than
* one value can be passed in for a sized property. If more than one value is provided the
* first value in the argument list becomes the default value.
*
* @param property the name of the property to set.
* @param propertyValue the values to assign to the property.
*/
public static void setGlobalProperty(Property property, Object[] propertyValue)
{
checkPermission(CanSetDefaultProperty);
Object[] rv = new Object[propertyValue.length];
System.arraycopy(propertyValue, 0, rv, 0, rv.length);
localSetGlobalProperty(property, rv);
}
private static void localSetThread(Property property, Object[] propertyValue)
{
Map properties = (Map)threadProperties.get();
if (properties == null)
{
properties = new HashMap();
threadProperties.set(properties);
}
properties.put(property.name, propertyValue);
}
private static void localSetGlobalProperty(Property property, Object[] propertyValue)
{
if (!property.type.isAssignableFrom(propertyValue[0].getClass()))
{
throw new IllegalArgumentException("Bad property value passed");
}
// set the property for the current thread as well to avoid mass confusion
localSetThread(property, propertyValue);
globalProperties.put(property.name, propertyValue);
}
/**
* Clear the global value for the passed in property.
*
* @param property the property to be cleared.
* @param the base type of the property value
* @return an array of T if a value was previously set, null otherwise.
*/
public static Object[] clearGlobalProperty(Property property)
{
checkPermission(CanSetDefaultProperty);
// clear the property for the current thread as well to avoid confusion
localClearThreadProperty(property);
return (Object[])globalProperties.remove(property.name);
}
/**
* Clear the thread local value for the passed in property.
*
* @param property the property to be cleared.
* @param the base type of the property value
* @return an array of T if a value was previously set, null otherwise.
*/
public static Object[] clearThreadProperty(Property property)
{
checkPermission(CanSetThreadProperty);
return localClearThreadProperty(property);
}
private static Object[] localClearThreadProperty(Property property)
{
Map properties = (Map)threadProperties.get();
if (properties == null)
{
properties = new HashMap();
threadProperties.set(properties);
}
return (Object[])properties.remove(property.name);
}
private static void checkPermission(final Permission permission)
{
final SecurityManager securityManager = System.getSecurityManager();
if (securityManager != null)
{
AccessController.doPrivileged(new PrivilegedAction()
{
public Object run()
{
securityManager.checkPermission(permission);
return null;
}
});
}
}
private static DHParameters toDH(DSAParameters dsaParams)
{
int pSize = dsaParams.getP().bitLength();
int m = chooseLowerBound(pSize);
return new DHParameters(dsaParams.getP(), dsaParams.getG(), dsaParams.getQ(), m, 0, null,
new DHValidationParameters(dsaParams.getValidationParameters().getSeed(), dsaParams.getValidationParameters().getCounter()));
}
// based on lower limit of at least 2^{2 * bits_of_security}
private static int chooseLowerBound(int pSize)
{
int m = 160;
if (pSize > 512)
{
if (pSize <= 2048)
{
m = 224;
}
else if (pSize <= 3072)
{
m = 256;
}
else if (pSize <= 7680)
{
m = 384;
}
else
{
m = 512;
}
}
return m;
}
/**
* Available properties that can be set.
*/
public static final class Property
{
/**
* The parameters to be used for processing implicitlyCA X9.62 parameters
*/
public static final Property EC_IMPLICITLY_CA = new Property("ecImplicitlyCA", X9ECParameters.class);
/**
* The default parameters for a particular size of Diffie-Hellman key.This is a sized property.
*/
public static final Property DH_DEFAULT_PARAMS= new Property("dhDefaultParams", DHParameters.class);
/**
* The default parameters for a particular size of DSA key. This is a sized property.
*/
public static final Property DSA_DEFAULT_PARAMS= new Property("dsaDefaultParams", DSAParameters.class);
private final String name;
private final Class type;
private Property(String name, Class type)
{
this.name = name;
this.type = type;
}
}
}
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