Move encryption into S3 backend.

[bluesky.git] / bluesky / crypto.c

diff --git a/bluesky/crypto.c b/bluesky/crypto.c
index c40c15c..6981f45 100644 (file)
--- a/bluesky/crypto.c
+++ b/bluesky/crypto.c
@@ -7,6 +7,7 @@
  */
 
 #include <stdint.h>
+#include <assert.h>
 #include <errno.h>
 #include <pthread.h>
 #include <glib.h>
@@ -15,8 +16,6 @@
 
 #include "bluesky-private.h"
 
-static int DISABLE_CRYPTO = 1;
-
 /* Cryptographic operations.  The rest of the BlueSky code merely calls into
  * the functions in this file, so this is the only point where we interface
  * with an external cryptographic library. */
@@ -43,14 +42,25 @@ void bluesky_crypt_random_bytes(guchar *buf, gint len)
     gcry_randomize(buf, len, GCRY_STRONG_RANDOM);
 }
 
+/* Hash a string down to an encryption key. */
+void bluesky_crypt_hash_key(const char *keystr, uint8_t *out)
+{
+    guint8 raw_csum[32];
+    gsize csum_len = sizeof(raw_csum);
+
+    assert(CRYPTO_KEY_SIZE == 16);
+
+    GChecksum *csum = g_checksum_new(G_CHECKSUM_SHA256);
+    g_checksum_update(csum, keystr, strlen(keystr));
+    g_checksum_get_digest(csum, raw_csum, &csum_len);
+    g_checksum_free(csum);
+
+    memcpy(out, raw_csum, CRYPTO_KEY_SIZE);
+}
+
 /* Encrypt a data block. */
 BlueSkyRCStr *bluesky_crypt_encrypt(BlueSkyRCStr *in, const uint8_t *key)
 {
-    if (DISABLE_CRYPTO) {
-        bluesky_string_ref(in);
-        return in;
-    }
-
     gcry_error_t status;
     gcry_cipher_hd_t handle;
 
@@ -91,11 +101,6 @@ BlueSkyRCStr *bluesky_crypt_encrypt(BlueSkyRCStr *in, const uint8_t *key)
 /* Decrypt a data block. */
 BlueSkyRCStr *bluesky_crypt_decrypt(BlueSkyRCStr *in, const uint8_t *key)
 {
-    if (DISABLE_CRYPTO) {
-        bluesky_string_ref(in);
-        return in;
-    }
-
     gcry_error_t status;
     gcry_cipher_hd_t handle;