Added ability to check if crypto restrictions are in place
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@ -22,6 +22,7 @@ import java.io.IOException;
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import java.io.InputStream;
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import java.nio.ByteBuffer;
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import java.nio.charset.StandardCharsets;
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import java.security.NoSuchAlgorithmException;
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import java.security.Provider;
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import java.security.Security;
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import java.util.Arrays;
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@ -29,6 +30,8 @@ import java.util.Enumeration;
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import java.util.jar.JarEntry;
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import java.util.jar.JarFile;
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import javax.crypto.Cipher;
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import org.bouncycastle.crypto.Digest;
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import org.bouncycastle.crypto.PBEParametersGenerator;
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import org.bouncycastle.crypto.digests.MD5Digest;
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@ -84,6 +87,21 @@ class Crypto {
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}
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}
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/**
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* Determines if cryptography restrictions apply.
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* 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.
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* 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>.
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*
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* @return <code>true</code> if restrictions apply, <code>false</code> otherwise
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*/
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public static boolean restrictedCryptography() {
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try {
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return Cipher.getMaxAllowedKeyLength("AES/CBC/PKCS5Padding") < Integer.MAX_VALUE;
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} catch (final NoSuchAlgorithmException e) {
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throw new IllegalStateException("The transform \"AES/CBC/PKCS5Padding\" is not available (the availability of this algorithm is mandatory for Java SE implementations)", e);
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}
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}
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public static
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byte[] hashFileMD5(File file) {
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