Use new RSA key creation APIs when available #1133
Merged
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We're looking to make the RSA struct in BoringSSL opaque, to unblock a host of improvements around that type. As part of that, we'll need to fix existing callers touching the struct, including Conscrypt.
In principle, OpenSSL already had APIs RSA_set0_* for this, but they are tedious to use. They also don't allow one to make an RSA key without e, but Conscrypt needs to support this. (Unless we can guess e based on n and d because it's almost certainly 3 or 65537.) They also do a weird deferred initialization thing that causes us some problems in BoringSSL.
In an attempt to fix this, we've added new APIs in https://boringssl-review.googlesource.com/c/boringssl/+/59386, including some specifically for Conscrypt's use case.