Unstable OpenSSL strings exposed

[Zash]

LuaSec exposes some OpenSSL strings representing certificate chain validation conditions:

luasec/src/context.c

Line 190 in 4c06287

lua_pushstring(L, X509_verify_cert_error_string(err));

In openssl/openssl@ade0873 one of these were changed, and in a discussion it was said that these strings should not be part of a public API as LuaSec makes them.