Put the links and the crypto they use in link/, a part of their own

libpure-link.a holds them; pure-serve and the M5 harness link it instead
of naming its source files.

1 files changed, 49 insertions, 0 deletions

diff --git a/link/crypto.h b/link/crypto.h
new file mode 100644
index 0000000..53ac785
--- /dev/null
+++ b/link/crypto.h
@@ -0,0 +1,49 @@
+#ifndef PURE_CRYPTO_H
+#define PURE_CRYPTO_H
+#include "seal.h"
+#include "tls.h"
+
+/* What pure-serve asks of OpenSSL, as the table pure-crypto.so exports
+ * (link/crypto-openssl.c). pure-serve maps it, and OpenSSL with it, the
+ * first time a server seals, opens a seal or connects to an https receiver
+ * (link/crypto.c): one that does none of these maps no OpenSSL, 2.3 MiB
+ * less resident and 0.6 MiB less of its own. */
+enum { PURE_CRYPTO_VERSION = 4 };
+
+typedef struct {
+    unsigned version;
+    /* TLS client: the context (verifying against ca_file, or the system's
+     * CAs when NULL), sessions over connected sockets, their reads and
+     * writes (as SSL_read and SSL_write: bytes, or <= 0), and their end. */
+    bool (*tls_start)(const char *ca_file);
+    PureTls *(*tls_open)(const char *host, int fd);
+    int (*tls_read)(PureTls *, void *bytes, int size);
+    int (*tls_write)(PureTls *, const void *bytes, int size);
+    void (*tls_close)(PureTls *);
+    /* Sealing, as link/seal.h says; a sender's sessions in the suite named. */
+    PureSealKey *(*seal_key)(const char *path, char public_hex[2 * PURE_SEAL_KEY + 1], char *error, size_t size);
+    void (*seal_key_free)(PureSealKey *);
+    PureSealer *(*sealer)(const char *suite, const unsigned char peer[PURE_SEAL_KEY], const PureSealKey *own,
+                          unsigned char enc[PURE_SEAL_KEY]);
+    bool (*seal)(PureSealer *, const char *aad, const unsigned char *plain, size_t size, unsigned char *out,
+                 uint64_t *n);
+    void (*sealer_free)(PureSealer *);
+    PureOpener *(*opener)(const PureSealKey *, const char *suite, const unsigned char enc[PURE_SEAL_KEY],
+                          const unsigned char *from);
+    bool (*unseal)(PureOpener *, uint64_t n, const char *aad, const unsigned char *sealed, size_t size,
+                   unsigned char *plain);
+    void (*opener_free)(PureOpener *);
+    /* Links, as link/seal.h says. */
+    bool (*link_secret)(const PureSealKey *, const unsigned char peer[PURE_SEAL_KEY], unsigned char out[32]);
+    bool (*link_derive)(const unsigned char secret[32], const unsigned char *info, size_t info_size, unsigned char *out,
+                        size_t out_size);
+    PureAead *(*aead)(const unsigned char key[PURE_AEAD_KEY]);
+    bool (*aead_seal)(PureAead *, const unsigned char *key, const unsigned char nonce[PURE_AEAD_NONCE],
+                      const unsigned char *aad, size_t aad_size, const unsigned char *plain, size_t size,
+                      unsigned char *out);
+    bool (*aead_open)(PureAead *, const unsigned char *key, const unsigned char nonce[PURE_AEAD_NONCE],
+                      const unsigned char *aad, size_t aad_size, const unsigned char *sealed, size_t size,
+                      unsigned char *plain);
+    void (*aead_free)(PureAead *);
+} PureCrypto;
+#endif