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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 1.5 to JDK 1.8. Note: this package includes the NTRU encryption algorithms.

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package org.bouncycastle.jcajce.provider.config;

import java.security.BasicPermission;
import java.security.Permission;
import java.util.StringTokenizer;

import org.bouncycastle.util.Strings;

/**
 * A permission class to define what can be done with the ConfigurableProvider interface.
 * 

* Available permissions are "threadLocalEcImplicitlyCa" and "ecImplicitlyCa" which allow the setting * of the thread local and global ecImplicitlyCa parameters respectively. *

*

* Examples: *

    *
  • ProviderConfigurationPermission("BC"); // enable all permissions
  • *
  • ProviderConfigurationPermission("BC", "threadLocalEcImplicitlyCa"); // enable thread local only
  • *
  • ProviderConfigurationPermission("BC", "ecImplicitlyCa"); // enable global setting only
  • *
  • ProviderConfigurationPermission("BC", "threadLocalEcImplicitlyCa, ecImplicitlyCa"); // enable both explicitly
  • *
*

* Note: permission checks are only enforced if a security manager is present. *

*/ public class ProviderConfigurationPermission extends BasicPermission { private static final int THREAD_LOCAL_EC_IMPLICITLY_CA = 0x01; private static final int EC_IMPLICITLY_CA = 0x02; private static final int THREAD_LOCAL_DH_DEFAULT_PARAMS = 0x04; private static final int DH_DEFAULT_PARAMS = 0x08; private static final int ACCEPTABLE_EC_CURVES = 0x10; private static final int ADDITIONAL_EC_PARAMETERS = 0x20; private static final int ALL = THREAD_LOCAL_EC_IMPLICITLY_CA | EC_IMPLICITLY_CA | THREAD_LOCAL_DH_DEFAULT_PARAMS | DH_DEFAULT_PARAMS | ACCEPTABLE_EC_CURVES | ADDITIONAL_EC_PARAMETERS; private static final String THREAD_LOCAL_EC_IMPLICITLY_CA_STR = "threadlocalecimplicitlyca"; private static final String EC_IMPLICITLY_CA_STR = "ecimplicitlyca"; private static final String THREAD_LOCAL_DH_DEFAULT_PARAMS_STR = "threadlocaldhdefaultparams"; private static final String DH_DEFAULT_PARAMS_STR = "dhdefaultparams"; private static final String ACCEPTABLE_EC_CURVES_STR = "acceptableeccurves"; private static final String ADDITIONAL_EC_PARAMETERS_STR = "additionalecparameters"; private static final String ALL_STR = "all"; private final String actions; private final int permissionMask; public ProviderConfigurationPermission(String name) { super(name); this.actions = "all"; this.permissionMask = ALL; } public ProviderConfigurationPermission(String name, String actions) { super(name, actions); this.actions = actions; this.permissionMask = calculateMask(actions); } private int calculateMask( String actions) { StringTokenizer tok = new StringTokenizer(Strings.toLowerCase(actions), " ,"); int mask = 0; while (tok.hasMoreTokens()) { String s = tok.nextToken(); if (s.equals(THREAD_LOCAL_EC_IMPLICITLY_CA_STR)) { mask |= THREAD_LOCAL_EC_IMPLICITLY_CA; } else if (s.equals(EC_IMPLICITLY_CA_STR)) { mask |= EC_IMPLICITLY_CA; } else if (s.equals(THREAD_LOCAL_DH_DEFAULT_PARAMS_STR)) { mask |= THREAD_LOCAL_DH_DEFAULT_PARAMS; } else if (s.equals(DH_DEFAULT_PARAMS_STR)) { mask |= DH_DEFAULT_PARAMS; } else if (s.equals(ACCEPTABLE_EC_CURVES_STR)) { mask |= ACCEPTABLE_EC_CURVES; } else if (s.equals(ADDITIONAL_EC_PARAMETERS_STR)) { mask |= ADDITIONAL_EC_PARAMETERS; } else if (s.equals(ALL_STR)) { mask |= ALL; } } if (mask == 0) { throw new IllegalArgumentException("unknown permissions passed to mask"); } return mask; } public String getActions() { return actions; } public boolean implies( Permission permission) { if (!(permission instanceof ProviderConfigurationPermission)) { return false; } if (!this.getName().equals(permission.getName())) { return false; } ProviderConfigurationPermission other = (ProviderConfigurationPermission)permission; return (this.permissionMask & other.permissionMask) == other.permissionMask; } public boolean equals( Object obj) { if (obj == this) { return true; } if (obj instanceof ProviderConfigurationPermission) { ProviderConfigurationPermission other = (ProviderConfigurationPermission)obj; return this.permissionMask == other.permissionMask && this.getName().equals(other.getName()); } return false; } public int hashCode() { return this.getName().hashCode() + this.permissionMask; } }




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