1 files changed, 77 insertions, 0 deletions
diff --git a/src/libzrtpcpp/crypto/gcrypt/gcryptAesCFB.cpp b/src/libzrtpcpp/crypto/gcrypt/gcryptAesCFB.cpp
new file mode 100644
index 0000000..3673619
--- /dev/null
+++ b/src/libzrtpcpp/crypto/gcrypt/gcryptAesCFB.cpp
@@ -0,0 +1,77 @@
+/*
+  Copyright (C) 2006-2007 Werner Dittmann
+
+  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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+
+/** Copyright (C) 2006, 2007
+ *
+ * @author  Werner Dittmann <Werner.Dittmann@t-online.de>
+ */
+
+#include <gcrypt.h>
+#include <libzrtpcpp/crypto/aesCFB.h>
+
+
+extern void initializeGcrypt();
+
+void aesCfbEncrypt(uint8_t* key, int32_t keyLength, uint8_t* IV, uint8_t *data,
+                   int32_t dataLength)
+{
+    gcry_error_t err = 0;
+    int algo;
+
+    initializeGcrypt();
+
+    if (keyLength == 16) {
+        algo = GCRY_CIPHER_AES;
+    }
+    else if (keyLength == 32) {
+        algo = GCRY_CIPHER_AES256;
+    }
+    else {
+	return;
+    }
+    gcry_cipher_hd_t tmp;
+    err = gcry_cipher_open(&tmp, algo, GCRY_CIPHER_MODE_CFB, 0);
+    err = gcry_cipher_setkey(tmp, key, keyLength);
+    err = gcry_cipher_setiv (tmp, IV, AES_BLOCK_SIZE);
+    err = gcry_cipher_encrypt (tmp, data, dataLength, data, dataLength);
+    gcry_cipher_close(tmp);
+}
+
+void aesCfbDecrypt(uint8_t* key, int32_t keyLength, const uint8_t* IV, uint8_t *data,
+                   int32_t dataLength)
+{
+    gcry_error_t err = 0;
+    int algo;
+
+    initializeGcrypt();
+
+    if (keyLength == 16) {
+        algo = GCRY_CIPHER_AES;
+    }
+    else if (keyLength == 32) {
+        algo = GCRY_CIPHER_AES256;
+    }
+    else {
+	return;
+    }
+    gcry_cipher_hd_t tmp;
+    err = gcry_cipher_open(&tmp, algo, GCRY_CIPHER_MODE_CFB, 0);
+    err = gcry_cipher_setkey(tmp, key, keyLength);
+    err = gcry_cipher_setiv (tmp, IV, AES_BLOCK_SIZE);
+    err = gcry_cipher_decrypt (tmp, data, dataLength, data, dataLength);
+    gcry_cipher_close(tmp);
+}