Map OpenSSL only in a server that uses it

Linking OpenSSL cost every pure-serve 2.3 MiB of resident memory, 0.66
MiB of it the process's own (relocated data), though most servers never
reach an https receiver or seal a send. The code that uses OpenSSL (TLS
to https receivers, sealing) is now built as pure-crypto.so beside
pure-serve and exports one table; pure-serve maps it the first time a
wire to an https URL opens or a key is read or a seal wired
(serve/crypto.c), and a missing library is reported at startup. What
needs no OpenSSL, a key's hex and the suite this CPU seals with, stays in
pure-serve.

An idle server: RSS 4,496 -> 2,320 kB, PSS 1,639 -> 881 kB, private
dirty 1,296 -> 864 kB. A static OpenSSL was measured too and is worse
(RSS 3.8 MiB, but 2.3 MiB private: all of its tables relocated). The
checks, https webhooks and sealed sends included, pass unchanged.

1 files changed, 5 insertions, 0 deletions

diff --git a/serve/serve.c b/serve/serve.c
index 4f633ed..5088d8a 100644
--- a/serve/serve.c
+++ b/serve/serve.c
@@ -1754,6 +1754,11 @@ static bool open_wires(Executor *ex, const PureModule *m, const char *const *sen
 
 /* --seal OUTPUT=KEY: that output's sends sealed to the receiver's public key (hex). */
 static bool wire_seals(Executor *ex, const PureModule *m, const char *const *seals, unsigned count) {
+    char error[512];
+    if (count && !pure_seal_ready(error, sizeof(error))) {
+        fprintf(stderr, "--seal: %s\n", error);
+        return false;
+    }
     for (unsigned i = 0; i < count; ++i) {
         const char *equals = strchr(seals[i], '=');
         unsigned char peer[PURE_SEAL_KEY];