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Added ability to check if crypto restrictions are in place

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Robinson 2023-01-13 00:50:32 +01:00
parent a763c7d468
commit d6a592e10d
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1 changed files with 18 additions and 0 deletions
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src/dorkbox/util/crypto/Crypto.java
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@ -22,6 +22,7 @@ import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;
import java.security.Security;
import java.util.Arrays;
@ -29,6 +30,8 @@ import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import javax.crypto.Cipher;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.PBEParametersGenerator;
import org.bouncycastle.crypto.digests.MD5Digest;
@ -84,6 +87,21 @@ class Crypto {
}
}
/**
* Determines if cryptography restrictions apply.
* Restrictions apply if the value of {@link Cipher#getMaxAllowedKeyLength(String)} returns a value smaller than {@link Integer#MAX_VALUE} if there are any restrictions according to the JavaDoc of the method.
* This method is used with the transform <code>"AES/CBC/PKCS5Padding"</code> as this is an often used algorithm that is <a href="https://docs.oracle.com/javase/8/docs/technotes/guides/security/StandardNames.html#impl">an implementation requirement for Java SE</a>.
*
* @return <code>true</code> if restrictions apply, <code>false</code> otherwise
*/
public static boolean restrictedCryptography() {
try {
return Cipher.getMaxAllowedKeyLength("AES/CBC/PKCS5Padding") < Integer.MAX_VALUE;
} catch (final NoSuchAlgorithmException e) {
throw new IllegalStateException("The transform \"AES/CBC/PKCS5Padding\" is not available (the availability of this algorithm is mandatory for Java SE implementations)", e);
}
}
public static
byte[] hashFileMD5(File file) {