Add zook's ZenUtils to SVN

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18010 a1c6a512-1295-4272-9138-f99709370657

utils/zenutils/source/shared/crypt.cpp

@@ -0,0 +1,91 @@
+/* zenutils - Utilities for working with creative firmwares.
+ * Copyright 2007 (c) Rasmus Ry <rasmus.ry{at}gmail.com>
+ *
+ * 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 of the License, 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
+ */
+
+#include "crypt.h"
+#include <stdexcept>
+#include <beecrypt/hmacsha1.h>
+#include <beecrypt/blockmode.h>
+#include <beecrypt/blowfish.h>
+
+
+bool zen::hmac_sha1_calc(const byte* key, size_t keylen, const byte* data,
+                         size_t datalen, byte* sig, size_t* siglen)
+{
+    hmacsha1Param param;
+    if (hmacsha1Setup(&param, key, keylen * 8))
+        return false;
+    if (hmacsha1Update(&param, data, datalen))
+        return false;
+    if (hmacsha1Digest(&param, sig))
+        return false;
+    return true;
+}
+
+bool zen::bf_cbc_encrypt(const byte* key, size_t keylen, byte* data,
+                         size_t datalen, const byte* iv)
+{
+    if (datalen % blowfish.blocksize)
+        throw std::invalid_argument(
+            "The length must be aligned on a 8 byte boundary.");
+
+	blowfishParam param;
+    if (blowfishSetup(&param, key, keylen * 8, ENCRYPT))
+        return false;
+    if (blowfishSetIV(&param, iv))
+        return false;
+
+    byte* plain = new byte[datalen];
+    memcpy(plain, data, datalen);
+
+    unsigned int nblocks = datalen / blowfish.blocksize;
+    if (blockEncryptCBC(&blowfish, &param, (uint32_t*)data, (uint32_t*)plain,
+                        nblocks))
+    {
+        delete [] plain;
+        return false;
+    }
+
+    return true;
+}
+
+bool zen::bf_cbc_decrypt(const byte* key, size_t keylen, byte* data,
+                         size_t datalen, const byte* iv)
+{
+    if (datalen % blowfish.blocksize)
+        throw std::invalid_argument(
+            "The length must be aligned on a 8 byte boundary.");
+
+	blowfishParam param;
+    if (blowfishSetup(&param, key, keylen * 8, ENCRYPT))
+        return false;
+    if (blowfishSetIV(&param, iv))
+        return false;
+
+    byte* cipher = new byte[datalen];
+    memcpy(cipher, data, datalen);
+
+    unsigned int nblocks = datalen / blowfish.blocksize;
+    if (blockDecryptCBC(&blowfish, &param, (uint32_t*)data, (uint32_t*)cipher,
+                        nblocks))
+    {
+        delete [] cipher;
+        return false;
+    }
+
+    return true;
+}