openssl: handle NULL in jose_openssl_jwk_from_EC_KEY gracefully #172
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We already check that the
RSA *keyis notNULLinjose_openssl_jwk_from_RSA(), but fail to do so forEC_KEY *keyinjose_openssl_jwk_from_EC_KEY().But
EVP_PKEY_get0_EC_KEY()can returnNULLtoo, e.g., if theEVP_PKEYcomes from an OpenSSL provider that is not creating a keymgmt instance for a public key and the default provider is not loaded1.Instead of crashing inside OpenSSL when we pass a NULL pointer to
EC_KEY_get0_private_key(), detect this case and return gracefully.