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POWhy MD5 is required for JCE initialization
 

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    <p>I am experimenting on enabling FIPS 180-3 on my java application. FIPS 180-3 allows only usage of 5 secure [hashes] (http://csrc.nist.gov/publications/fips/fips180-3/fips180-3_final.pdf) , MD5 is not one among them. Hence i am trying to programatically remove MD5 algorithms from the Sun provider. This is the sample code.</p> <hr> <pre><code>public static void main(String[] args) throws Exception { Security.removeProvider("SUN"); Sun sun = new Sun(); sun.remove("MessageDigest.MD5"); //Comment and it will work !!! Security.addProvider(sun); Cipher ciph = Cipher.getInstance("AES"); } </code></pre> <hr> <p>But this is throwing the following exception. If you comment "sun.remove(.." the program works fine. If i remove MD2, instead of MD5 then also it works fine.</p> <p>To me it looks like the jre libs are using MD5 for their signing, but i checked jre/lib/ext/sunjce_provider.jar signer and its using sha1.</p> <p>Any idea why my code is failing with this error?</p> <p>Exception in thread "main" java.lang.ExceptionInInitializerError at javax.crypto.Cipher.getInstance(DashoA13*..) at TestRemoveMD5.main(TestRemoveMD5.java:20)</p> <p>Caused by: java.lang.SecurityException: Cannot set up certs for trusted CAs at javax.crypto.SunJCE_b.(DashoA13*..) ... 3 more</p> <p>Caused by: java.lang.SecurityException: Signature classes have been tampered with at javax.crypto.SunJCE_b.d(DashoA13*..) at javax.crypto.SunJCE_b.c(DashoA13*..) at javax.crypto.SunJCE_b$1.run(DashoA13*..) at java.security.AccessController.doPrivileged(Native Method) ... 4 more</p>
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    1. COHave you removed all certificates from JRE trust store that use MD5 hash?
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    2. COI am using a fresh jdk 1.6
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    3. COThen you have to remove ever certificate using MD5 from the trust store of the JRE.
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