Version 1.7.22, 2008-11-17
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* Add provider preferences to Algorithm_Factory
* Fix memory leaks in PBE_PKCS5v20 and get_pbe introduced in 1.7.21
* Optimize AES encryption and decryption (about 10% faster)
* Enable SSE2 optimized SHA-1 implementation on Intel Prescott CPUs
* Fix nanoseconds overflow in benchmark code
* Remove Engine::add_engine

