SN_aes_256_cbc
cipher = EVP_CIPHER_fetch(app_get0_libctx(), SN_aes_256_cbc, app_get0_propq());
cipher = EVP_CIPHER_fetch(ctx->libctx, SN_aes_256_cbc, ctx->propq);
EVP_add_cipher_alias(SN_aes_256_cbc, "AES256");
EVP_add_cipher_alias(SN_aes_256_cbc, "aes256");