[DRAFT] Alias OpenSSL SECLEVEL directives to ALL

[WillChilds-Klein]

Issues:

Addresses CryptoAlg-2792

Description of changes:

To increase compatibility with OpenSSL's notion of "security levels", this commit aliases all security levels ≤ 3 to AWS-LC's ALL alias. Described here, OpenSSL's security levels ≤ 3 stipulate at most 128 bits of security. Because we don't offer any ciphersuites providing less than 128 bits of security, we enable all ciphersuites in those cases.

Testing:

• CI with reduced CPython patch set

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[samuel40791765]

Just to give some more context, I initially set our default security level to 3 under the same justifications. However, I had to change the value to 0 later on because we don't directly prohibit 512 bit RSA keys like OpenSSL states with Level 1..
This commit has more details: 42cd981