Add evp_cipher perftool

[andrewkdinh]

Summary

Adds a CLI tool evp_cipher that encrypts random data using the specified algorithm.
Runs for 5 seconds and prints the average execution time per encryption.

Fixes openssl/project#1727

Features

• Two modes of operation:
  • evp_isolated: Use EVP API and don't allow shared data between threads
  • evp_shared (default): Use EVP API and allow shared data between threads (i.e. pre-initializing & sharing the EVP_CIPHER_CTX)
• Currently supported algorithms: [AES-128-CBC, AES-256-CBC] (default: AES-128-CBC)
• Configurable number of times to update
• Terse output for easier CI automation (-t)
• Configurable thread count

TODO: Since freeze functionality hasn't been properly added yet (see openssl/project#1726 & openssl/openssl#29433), support for freezing the context store has not been added yet.

Usage

$ ./evp_cipher -h
Usage: evp_cipher [-h] [-t] [-o operation] [-u update-times] [-a algorithm] thread-count
-h - print this help output
-t - terse output
-o operation - mode of operation. One of [evp_isolated, evp_shared] (default: evp_shared)
-u update-times - times to update (default: 1)
-a algorithm - One of: [AES-128-CBC, AES-256-CBC] (default: AES-128-CBC)
thread-count - number of threads

$ ./evp_cipher -a AES-128-CBC -o evp_shared 10 # AES-128-CBC encryption algorithm, evp_shared operation mode, 10 threads
Average time per encryption: 0.202960us

$ ./evp_cipher -a AES-128-CBC -o evp_isolated 10 # now using evp_isolated operation mode
Average time per encryption: 2.418870us

Findings

Initial results showed that evp_isolated mode generally runs about 10x slower than evp_shared mode.