Created
September 18, 2017 13:56
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//https://stackoverflow.com/questions/1179672/how-to-avoid-installing-unlimited-strength-jce-policy-files-when-deploying-an | |
private static void removeCryptographyRestrictions() { | |
if (!isRestrictedCryptography()) { | |
return; | |
} | |
try { | |
/* | |
* Do the following, but with reflection to bypass access checks: | |
* | |
* JceSecurity.isRestricted = false; JceSecurity.defaultPolicy.perms.clear(); | |
* JceSecurity.defaultPolicy.add(CryptoAllPermission.INSTANCE); | |
*/ | |
final Class<?> jceSecurity = Class.forName("javax.crypto.JceSecurity"); | |
final Class<?> cryptoPermissions = Class.forName("javax.crypto.CryptoPermissions"); | |
final Class<?> cryptoAllPermission = Class.forName("javax.crypto.CryptoAllPermission"); | |
Field isRestrictedField = jceSecurity.getDeclaredField("isRestricted"); | |
isRestrictedField.setAccessible(true); | |
setFinalStatic(isRestrictedField, true); | |
isRestrictedField.set(null, false); | |
final Field defaultPolicyField = jceSecurity.getDeclaredField("defaultPolicy"); | |
defaultPolicyField.setAccessible(true); | |
final PermissionCollection defaultPolicy = (PermissionCollection) defaultPolicyField.get(null); | |
final Field perms = cryptoPermissions.getDeclaredField("perms"); | |
perms.setAccessible(true); | |
((Map<?, ?>) perms.get(defaultPolicy)).clear(); | |
final Field instance = cryptoAllPermission.getDeclaredField("INSTANCE"); | |
instance.setAccessible(true); | |
defaultPolicy.add((Permission) instance.get(null)); | |
} | |
catch (final Exception e) { | |
e.printStackTrace(); | |
} | |
} |
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