Beginning of a crypto/ subsystem from Max Neklyudov

1 files changed, 168 insertions, 0 deletions

diff --git a/nuttx/crypto/cryptodev.c b/nuttx/crypto/cryptodev.c
new file mode 100644
index 000000000..486d43baf
--- /dev/null
+++ b/nuttx/crypto/cryptodev.c
@@ -0,0 +1,168 @@
+/****************************************************************************
+ * crypto/cryptodev.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdbool.h>
+#include <string.h>
+#include <poll.h>
+#include <errno.h>
+
+#include <nuttx/fs/fs.h>
+
+#include <crypto/crypto.h>
+#include <crypto/cryptodev.h>
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/* Character driver methods */
+
+static ssize_t cryptodev_read(FAR struct file *filep, FAR char *buffer,
+                              size_t len);
+static ssize_t cryptodev_write(FAR struct file *filep, FAR const char *buffer,
+                               size_t len);
+static int cryptodev_ioctl(FAR struct file *filep, int cmd,
+                           unsigned long arg);
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static const struct file_operations g_cryptodevops =
+{
+  0,                  /* open */
+  0,                  /* close */
+  cryptodev_read,     /* read */
+  cryptodev_write,    /* write */
+  0,                  /* seek */
+  cryptodev_ioctl,    /* ioctl */
+  0,                  /* poll */
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+static ssize_t cryptodev_read(FAR struct file *filep, FAR char *buffer,
+                              size_t len)
+{
+  return -EACCES;
+}
+
+static ssize_t cryptodev_write(FAR struct file *filep, FAR const char *buffer,
+                               size_t len)
+{
+  return -EACCES;
+}
+
+static int cryptodev_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
+{
+  switch(cmd)
+  {
+  case CIOCGSESSION:
+    {
+      struct session_op *ses = (struct session_op*)arg;
+      ses->ses = (uint32_t)ses;
+      return OK;
+    }
+
+  case CIOCFSESSION:
+    {
+      return OK;
+    }
+
+  case CIOCCRYPT:
+    {
+      FAR struct crypt_op *op = (struct crypt_op*)arg;
+      FAR struct session_op *ses = (struct session_op*)op->ses;
+      int encrypt;
+
+      switch (op->op)
+      {
+      case COP_ENCRYPT:
+        encrypt = 1;
+        break;
+
+      case COP_DECRYPT:
+        encrypt = 0;
+        break;
+
+      default:
+        return -EINVAL;
+      }
+
+      switch (ses->cipher)
+      {
+
+#if defined(CONFIG_CRYPTO_AES)
+#  define AES_CYPHER(mode) aes_cypher(op->dst, op->src, op->len, op->iv, ses->key, ses->keylen, mode, encrypt)
+
+      case CRYPTO_AES_ECB:
+        return AES_CYPHER(AES_MODE_ECB);
+
+      case CRYPTO_AES_CBC:
+        return AES_CYPHER(AES_MODE_CBC);
+
+      case CRYPTO_AES_CTR:
+        return AES_CYPHER(AES_MODE_CTR);
+
+#  undef AES_CYPHER
+#endif
+
+      default:
+        return -EINVAL;
+      }
+    }
+
+  default:
+    return -EINVAL;
+  }
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+void devcrypto_register(void)
+{
+  (void)register_driver("/dev/crypto", &g_cryptodevops, 0666, NULL);
+}