How to use PKCS related classes?

Hi,
I am happening to deal with PKCS7. The client will send me (the server) a PKCS7 envelope and I need to decrypt and/or get data like certificate, etc from the PKCS7 envelope. Are the required/related classes not part of Java API? We use 1.4.2_06. Do I have to use/buy/download any special API to deal with pkcs?
This link http://java.sun.com/products/jce/jce122_providers.html says one needs to buy one of the listed Cryptographic Service Providers. Did any one deal with PKCS? If so what did you use/buy/download? Is there any information on net on how to use those APIs - examples, samplex, documentation, etc?
Thanks in advance for help,
-Pramodh

You can use the BouncyCastle JCE provider to use PKCS7 objects. It is free. David Hook's book "Cryptography in Java" provides numerous examples of how to use the BC libraries with PKCS objects.

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