[librest] Revert "Use HMAC glib implementation instead of rolling our own"

[Christophe Fergeau <teuf src gnome org>]

commit 44a79fd73de5862d2106f5ad9192b566502a7052
Author: Christophe Fergeau <cfergeau redhat com>
Date:   Thu Jun 28 12:33:07 2012 +0200

    Revert "Use HMAC glib implementation instead of rolling our own"
    
    This reverts commit 2a8dac4cc7aeca25b182bb9806ddb1881f2f4994.
    Pushed by mistake...

 configure.ac                    |    2 +-
 rest-extras/flickr-proxy-call.c |    1 +
 rest-extras/lastfm-proxy-call.c |    1 +
 rest/Makefile.am                |    4 +-
 rest/oauth-proxy-call.c         |    6 +-
 rest/oauth2-proxy-call.c        |    1 +
 rest/sha1.c                     |  108 +++++++++++++++++++++++++++++++++++++++
 rest/sha1.h                     |   22 ++++++++
 8 files changed, 140 insertions(+), 5 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 680ade1..f1105ae 100644
--- a/configure.ac
+++ b/configure.ac
@@ -40,7 +40,7 @@ AM_PROG_CC_C_O
 LT_PREREQ([2.2.6])
 LT_INIT([disable-static])
 
-PKG_CHECK_MODULES(GLIB, glib-2.0 >= 2.30)
+PKG_CHECK_MODULES(GLIB, glib-2.0 >= 2.24)
 PKG_CHECK_MODULES(SOUP, libsoup-2.4)
 PKG_CHECK_MODULES(XML, libxml-2.0)
 PKG_CHECK_MODULES(GTHREAD, gthread-2.0)
diff --git a/rest-extras/flickr-proxy-call.c b/rest-extras/flickr-proxy-call.c
index 51881dd..a9bc6f7 100644
--- a/rest-extras/flickr-proxy-call.c
+++ b/rest-extras/flickr-proxy-call.c
@@ -26,6 +26,7 @@
 #include "flickr-proxy-call.h"
 #include "flickr-proxy-private.h"
 #include "rest/rest-proxy-call-private.h"
+#include "rest/sha1.h"
 
 G_DEFINE_TYPE (FlickrProxyCall, flickr_proxy_call, REST_TYPE_PROXY_CALL)
 
diff --git a/rest-extras/lastfm-proxy-call.c b/rest-extras/lastfm-proxy-call.c
index afc7288..5e04038 100644
--- a/rest-extras/lastfm-proxy-call.c
+++ b/rest-extras/lastfm-proxy-call.c
@@ -27,6 +27,7 @@
 #include "lastfm-proxy-call.h"
 #include "lastfm-proxy-private.h"
 #include "rest/rest-proxy-call-private.h"
+#include "rest/sha1.h"
 
 G_DEFINE_TYPE (LastfmProxyCall, lastfm_proxy_call, REST_TYPE_PROXY_CALL)
 
diff --git a/rest/Makefile.am b/rest/Makefile.am
index 35067c5..e8a313f 100644
--- a/rest/Makefile.am
+++ b/rest/Makefile.am
@@ -18,7 +18,9 @@ lib_sources = \
 	oauth-proxy-private.h 		\
 	oauth2-proxy.c			\
 	oauth2-proxy-call.c		\
-	oauth2-proxy-private.h
+	oauth2-proxy-private.h 		\
+	sha1.c				\
+	sha1.h
 lib_headers = \
 	rest-param.h		\
 	rest-params.h		\
diff --git a/rest/oauth-proxy-call.c b/rest/oauth-proxy-call.c
index c9d1ecd..d8cff95 100644
--- a/rest/oauth-proxy-call.c
+++ b/rest/oauth-proxy-call.c
@@ -26,6 +26,7 @@
 #include "oauth-proxy-call.h"
 #include "oauth-proxy-private.h"
 #include "rest-proxy-call-private.h"
+#include "sha1.h"
 
 G_DEFINE_TYPE (OAuthProxyCall, oauth_proxy_call, REST_TYPE_PROXY_CALL)
 
@@ -162,9 +163,8 @@ sign_hmac (OAuthProxy *proxy, RestProxyCall *call, GHashTable *oauth_params)
   /* PLAINTEXT signature value is the HMAC-SHA1 key value */
   key = sign_plaintext (priv);
 
-  signature = g_compute_hmac_for_string (G_CHECKSUM_SHA1,
-                                         (guchar *)key, strlen (key),
-                                         text->str, -1);
+  signature = hmac_sha1 (key, text->str);
+
   g_free (key);
   g_string_free (text, TRUE);
 
diff --git a/rest/oauth2-proxy-call.c b/rest/oauth2-proxy-call.c
index 87ad8f7..f0d441c 100644
--- a/rest/oauth2-proxy-call.c
+++ b/rest/oauth2-proxy-call.c
@@ -27,6 +27,7 @@
 #include "oauth2-proxy-call.h"
 #include "oauth2-proxy-private.h"
 #include "rest-proxy-call-private.h"
+#include "sha1.h"
 
 G_DEFINE_TYPE (OAuth2ProxyCall, oauth2_proxy_call, REST_TYPE_PROXY_CALL)
 
diff --git a/rest/sha1.c b/rest/sha1.c
new file mode 100644
index 0000000..b2f4f0b
--- /dev/null
+++ b/rest/sha1.c
@@ -0,0 +1,108 @@
+/*
+ * librest - RESTful web services access
+ * Copyright (c) 2008, 2009, Intel Corporation.
+ *
+ * Authors: Ross Burton <ross linux intel com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU Lesser General Public License,
+ * version 2.1, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <string.h>
+#include <glib.h>
+#include "sha1.h"
+
+#define SHA1_BLOCK_SIZE 64
+#define SHA1_LENGTH 20
+
+/*
+ * hmac_sha1:
+ * @key: The key
+ * @message: The message
+ *
+ * Given the key and message, compute the HMAC-SHA1 hash and return the base-64
+ * encoding of it.  This is very geared towards OAuth, and as such both key and
+ * message must be NULL-terminated strings, and the result is base-64 encoded.
+ */
+char *
+hmac_sha1 (const char *key, const char *message)
+{
+  GChecksum *checksum;
+  char *real_key;
+  guchar ipad[SHA1_BLOCK_SIZE];
+  guchar opad[SHA1_BLOCK_SIZE];
+  guchar inner[SHA1_LENGTH];
+  guchar digest[SHA1_LENGTH];
+  gsize key_length, inner_length, digest_length;
+  int i;
+
+  g_return_val_if_fail (key, NULL);
+  g_return_val_if_fail (message, NULL);
+
+  checksum = g_checksum_new (G_CHECKSUM_SHA1);
+
+  /* If the key is longer than the block size, hash it first */
+  if (strlen (key) > SHA1_BLOCK_SIZE) {
+    guchar new_key[SHA1_LENGTH];
+
+    key_length = sizeof (new_key);
+
+    g_checksum_update (checksum, (guchar*)key, strlen (key));
+    g_checksum_get_digest (checksum, new_key, &key_length);
+    g_checksum_reset (checksum);
+
+    real_key = g_memdup (new_key, key_length);
+  } else {
+    real_key = g_strdup (key);
+    key_length = strlen (key);
+  }
+
+  /* Sanity check the length */
+  g_assert (key_length <= SHA1_BLOCK_SIZE);
+
+  /* Protect against use of the provided key by NULLing it */
+  key = NULL;
+
+  /* Stage 1 */
+  memset (ipad, 0, sizeof (ipad));
+  memset (opad, 0, sizeof (opad));
+
+  memcpy (ipad, real_key, key_length);
+  memcpy (opad, real_key, key_length);
+
+  /* Stage 2 and 5 */
+  for (i = 0; i < sizeof (ipad); i++) {
+    ipad[i] ^= 0x36;
+    opad[i] ^= 0x5C;
+  }
+
+  /* Stage 3 and 4 */
+  g_checksum_update (checksum, ipad, sizeof (ipad));
+  g_checksum_update (checksum, (guchar*)message, strlen (message));
+  inner_length = sizeof (inner);
+  g_checksum_get_digest (checksum, inner, &inner_length);
+  g_checksum_reset (checksum);
+
+  /* Stage 6 and 7 */
+  g_checksum_update (checksum, opad, sizeof (opad));
+  g_checksum_update (checksum, inner, inner_length);
+
+  digest_length = sizeof (digest);
+  g_checksum_get_digest (checksum, digest, &digest_length);
+
+  g_checksum_free (checksum);
+  g_free (real_key);
+
+  return g_base64_encode (digest, digest_length);
+}
diff --git a/rest/sha1.h b/rest/sha1.h
new file mode 100644
index 0000000..3538e21
--- /dev/null
+++ b/rest/sha1.h
@@ -0,0 +1,22 @@
+/*
+ * librest - RESTful web services access
+ * Copyright (c) 2008, 2009, Intel Corporation.
+ *
+ * Authors: Ross Burton <ross linux intel com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU Lesser General Public License,
+ * version 2.1, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+char * hmac_sha1 (const char *key, const char *message);