As we talked about yesterday, the default JDK has a limitation on key size which is bounded by the JCE Jurisdiction Policy.

• Java Cryptography Extension – Check Maximum Allowed Key Size

But actually, Java provides a JCE Patch such that you can remove the restriction on key size.
The patch is called Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files which can be download at Java SE Downloads.

Extract the download file and copy the following 2 files to your JDK which is $JAVA_HOME/jre/lib/security

• local_policy.jar
• US_export_policy.jar

Check the key size and now all algorithms will have unlimited key size restriction.

BLOWFISH              : 2147483647bit
ARCFOUR               : 2147483647bit
PBEWITHMD5ANDDES      : 2147483647bit
RC2                   : 2147483647bit
RSA                   : 2147483647bit
PBEWITHMD5ANDTRIPLEDES: 2147483647bit
PBEWITHSHA1ANDDESEDE  : 2147483647bit
DESEDE                : 2147483647bit
AESWRAP               : 2147483647bit
AES                   : 2147483647bit
DES                   : 2147483647bit
DESEDEWRAP            : 2147483647bit
RSA/ECB/PKCS1PADDING  : 2147483647bit
PBEWITHSHA1ANDRC2_40  : 2147483647bit

Done =)