cmsutil

The cmsutil command-line utility uses the S/MIME Toolkit to perform basic operations, such as encryption and decryption, on Cryptographic Message Syntax (CMS) messages. It performs basic certificate management operations such as encrypting, decrypting, and signing messages. More information on cmsutil can be found at:

http://www.mozilla.org/projects/security/pki/nss/tools/cmsutil.html