CryptoPkg

UEFI details interfaces between the OS and platform firmware. Several security features were introduced (e.g. Authenticated Variable Service, Driver Signing, etc) starting in UEFI Specification version 2.2 (http://www.uefi.org). These security features highly depend on cryptography, which is implemented in EDK II using CryptoPkg.

https://github.com/tianocore/edk2/tree/master/CryptoPkg

https://github.com/tianocore/edk2/raw/master/CryptoPkg/Library/OpensslLib/OpenSSL-HOWTO.txt

For EDK II branches prior to UDK2017 ... There is a dependency on a specific OpenSSL version for your workspace. Please refer to

<YourWorkSpace>/CryptoPkg/Library/OpensslLib/Patch-HOWTO.txt 

for information on how to download and apply patches required to compile CryptoPkg.