|The Open–source PKI Book: A guide to PKIs and Open–source Implementations|
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Rainbow Technologies manufacture a set of cryptographic hardware products and they offer good support for open–source operating systems. One of their products is the CryptoSwift eCommerce Accelerator, which is a hardware crypto accelerator that supports, among others, RSA, DSS, random number generation and secure storage of private keys. For Linux, a binary kernel module is included.
At Rainbow's ISG Labs, one can find performance data and other information relating to benchmarking of the product in common test cases. For open–source applications, a comprehensive study On the performance of Stronghold/Apache+SSL secure web servers, shows significant gains using hardware acceleration.
Interested parties can apply to qualify for a demo card. They need to describe a project that they will be undertaking.
Finally, there is the CryptoSwift Software Development Kit to aid the development of hardware crypto accelerated software.