[epiphany/mcatanzaro/nettle-upgrade] Require nettle 3.4

[Michael Catanzaro <mcatanzaro src gnome org>]

commit cbff12fc4af094a40d8d55f7fa604eaf603e7f42
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Tue Dec 4 16:21:51 2018 -0600

    Require nettle 3.4
    
    This version of nettle is present in Ubuntu 18.04, so we can use it now
    and delete some code.

 lib/sync/ephy-sync-crypto.c | 65 ---------------------------------------------
 meson.build                 |  2 +-
 2 files changed, 1 insertion(+), 66 deletions(-)
---
diff --git a/lib/sync/ephy-sync-crypto.c b/lib/sync/ephy-sync-crypto.c
index bfc899cdf..f010aab82 100644
--- a/lib/sync/ephy-sync-crypto.c
+++ b/lib/sync/ephy-sync-crypto.c
@@ -30,9 +30,7 @@
 #include <libsoup/soup.h>
 #include <nettle/aes.h>
 #include <nettle/cbc.h>
-#if (NETTLE_VERSION_MAJOR >= 3 && NETTLE_VERSION_MINOR >= 4)
 #include <nettle/hkdf.h>
-#endif
 #include <nettle/hmac.h>
 #include <string.h>
 
@@ -532,7 +530,6 @@ ephy_sync_crypto_hkdf (const guint8 *in,
                        gsize         info_len,
                        gsize         out_len)
 {
-#if (NETTLE_VERSION_MAJOR >= 3 && NETTLE_VERSION_MINOR >= 4)
   struct hmac_sha256_ctx ctx;
   guint8 *salt;
   guint8 *prk;
@@ -563,68 +560,6 @@ ephy_sync_crypto_hkdf (const guint8 *in,
   g_free (prk);
 
   return out;
-#else
-  char *prk_hex;
-  char *tmp_hex;
-  guint8 *tmp;
-  guint8 *out_full;
-  guint8 *data;
-  guint8 *salt;
-  guint8 *prk;
-  guint8 *out;
-  guint8 counter;
-  gsize data_len;
-  gsize n;
-
-  g_assert (in);
-  g_assert (info);
-
-  /* Salt is an array of hash length zeros. */
-  salt = g_malloc0 (SHA256_DIGEST_SIZE);
-  out = g_malloc (out_len);
-
-  /* Step 1: Extract (https://tools.ietf.org/html/rfc5869) */
-  prk_hex = g_compute_hmac_for_data (G_CHECKSUM_SHA256,
-                                     salt, SHA256_DIGEST_SIZE,
-                                     in, in_len);
-  prk = ephy_sync_utils_decode_hex (prk_hex);
-
-  /* Step 2: Expand (https://tools.ietf.org/html/rfc5869) */
-  counter = 1;
-  n = (out_len + SHA256_DIGEST_SIZE - 1) / SHA256_DIGEST_SIZE;
-  out_full = g_malloc (n * SHA256_DIGEST_SIZE);
-
-  for (gsize i = 0; i < n; i++, counter++) {
-    if (i == 0) {
-      data = ephy_sync_crypto_concat_bytes (info, info_len, &counter, 1, NULL);
-      data_len = info_len + 1;
-    } else {
-      data = ephy_sync_crypto_concat_bytes (out_full + (i - 1) * SHA256_DIGEST_SIZE,
-                                            SHA256_DIGEST_SIZE, info, info_len,
-                                            &counter, 1, NULL);
-      data_len = SHA256_DIGEST_SIZE + info_len + 1;
-    }
-
-    tmp_hex = g_compute_hmac_for_data (G_CHECKSUM_SHA256,
-                                       prk, SHA256_DIGEST_SIZE,
-                                       data, data_len);
-    tmp = ephy_sync_utils_decode_hex (tmp_hex);
-    memcpy (out_full + i * SHA256_DIGEST_SIZE, tmp, SHA256_DIGEST_SIZE);
-
-    g_free (data);
-    g_free (tmp);
-    g_free (tmp_hex);
-  }
-
-  memcpy (out, out_full, out_len);
-
-  g_free (prk_hex);
-  g_free (salt);
-  g_free (prk);
-  g_free (out_full);
-
-  return out;
-#endif
 }
 
 void
diff --git a/meson.build b/meson.build
index f6f5007ce..e85f15513 100644
--- a/meson.build
+++ b/meson.build
@@ -69,7 +69,7 @@ endif
 # of any dependency.
 glib_requirement = '>= 2.56.0'
 gtk_requirement = '>= 3.22.13'
-nettle_requirement = '>= 3.2'
+nettle_requirement = '>= 3.4'
 webkitgtk_requirement = '>= 2.21.92'
 
 cairo_dep = dependency('cairo', version: '>= 1.2')