replaced md5.[ch] with public domain code in GNet.

git-svn-id: svn://sylpheed.sraoss.jp/sylpheed/trunk@559 ee746299-78ed-0310-b773-934348b2243d

1 files changed, 135 insertions, 0 deletions

diff --git a/libsylph/md5_hmac.c b/libsylph/md5_hmac.c
new file mode 100644
index 00000000..46c0f523
--- /dev/null
+++ b/libsylph/md5_hmac.c
@@ -0,0 +1,135 @@
+/*
+ * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
+ * Copyright (C) 1999-2005 Hiroyuki Yamamoto
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#include <glib.h>
+#include <string.h>
+
+#include "md5.h"
+#include "md5_hmac.h"
+
+/*
+** Function: md5_hmac_get
+** taken from the file rfc2104.txt
+** originally written by Martin Schaaf <mascha@ma-scha.de>
+** rewritten by Hiroyuki Yamamoto <hiro-y@kcn.ne.jp>
+*/
+static SMD5*
+md5_hmac_get(const guchar *text, gint text_len,
+	     const guchar *key, gint key_len)
+{
+	SMD5 *md5;
+	guchar k_ipad[64];    /* inner padding -
+			       * key XORd with ipad
+			       */
+	guchar k_opad[64];    /* outer padding -
+			       * key XORd with opad
+			       */
+	guchar digest[S_GNET_MD5_HASH_LENGTH];
+	gint i;
+
+	/* start out by storing key in pads */
+	memset(k_ipad, 0, sizeof k_ipad);
+	memset(k_opad, 0, sizeof k_opad);
+
+	if (key_len > 64) {
+		/* if key is longer than 64 bytes reset it to key=MD5(key) */
+		SMD5 *tmd5;
+
+		tmd5 = s_gnet_md5_new_incremental();
+		s_gnet_md5_update(tmd5, key, key_len);
+		s_gnet_md5_final(tmd5);
+		memcpy(k_ipad, s_gnet_md5_get_digest(tmd5),
+		       S_GNET_MD5_HASH_LENGTH);
+		memcpy(k_opad, s_gnet_md5_get_digest(tmd5),
+		       S_GNET_MD5_HASH_LENGTH);
+		s_gnet_md5_delete(tmd5);
+	} else {
+		memcpy(k_ipad, key, key_len);
+		memcpy(k_opad, key, key_len);
+	}
+
+	/*
+	 * the HMAC_MD5 transform looks like:
+	 *
+	 * MD5(K XOR opad, MD5(K XOR ipad, text))
+	 *
+	 * where K is an n byte key
+	 * ipad is the byte 0x36 repeated 64 times
+	 * opad is the byte 0x5c repeated 64 times
+	 * and text is the data being protected
+	 */
+
+
+	/* XOR key with ipad and opad values */
+	for (i = 0; i < 64; i++) {
+		k_ipad[i] ^= 0x36;
+		k_opad[i] ^= 0x5c;
+	}
+
+	/*
+	 * perform inner MD5
+	 */
+	md5 = s_gnet_md5_new_incremental();	/* init context for 1st
+						 * pass */
+	s_gnet_md5_update(md5, k_ipad, 64);	/* start with inner pad */
+	s_gnet_md5_update(md5, text, text_len);	/* then text of datagram */
+	s_gnet_md5_final(md5);			/* finish up 1st pass */
+	memcpy(digest, s_gnet_md5_get_digest(md5), S_GNET_MD5_HASH_LENGTH);
+	s_gnet_md5_delete(md5);
+
+	/*
+	 * perform outer MD5
+	 */
+	md5 = s_gnet_md5_new_incremental();	/* init context for 2nd
+						 * pass */
+	s_gnet_md5_update(md5, k_opad, 64);	/* start with outer pad */
+	s_gnet_md5_update(md5, digest, 16);	/* then results of 1st
+						 * hash */
+	s_gnet_md5_final(md5);			/* finish up 2nd pass */
+
+	return md5;
+}
+
+void
+md5_hmac(guchar *digest,
+	 const guchar *text, gint text_len,
+	 const guchar *key, gint key_len)
+{
+	SMD5 *md5;
+
+	md5 = md5_hmac_get(text, text_len, key, key_len);
+	memcpy(digest, s_gnet_md5_get_digest(md5), S_GNET_MD5_HASH_LENGTH);
+	s_gnet_md5_delete(md5);
+}
+
+void
+md5_hex_hmac(gchar *hexdigest,
+	     const guchar *text, gint text_len,
+	     const guchar *key, gint key_len)
+{
+	SMD5 *md5;
+
+	md5 = md5_hmac_get(text, text_len, key, key_len);
+	s_gnet_md5_copy_string(md5, hexdigest);
+	hexdigest[S_GNET_MD5_HASH_LENGTH * 2] = '\0';
+}