Add routines to read and write the encryption module configuration in an
image header.
Signed-off-by: Nigel Cunningham <[email protected]>
kernel/power/encryption.c | 83 +++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 83 insertions(+), 0 deletions(-)
diff --git a/kernel/power/encryption.c b/kernel/power/encryption.c
index d12eb47..1664b82 100644
--- a/kernel/power/encryption.c
+++ b/kernel/power/encryption.c
@@ -316,4 +316,87 @@ static unsigned long suspend_encrypt_sto
(4 + strlen(suspend_encryptor_key) +
strlen(suspend_encryptor_iv)) : 0);
}
+
+/* suspend_encrypt_save_config_info
+ *
+ * Description: Save informaton needed when reloading the image at resume time.
+ * Arguments: Buffer: Pointer to a buffer of size PAGE_SIZE.
+ * Returns: Number of bytes used for saving our data.
+ */
+static int suspend_encrypt_save_config_info(char *buffer)
+{
+ int buf_offset, str_size;
+ str_size = strlen(suspend_encryptor_name);
+ *buffer = (char) str_size;
+ strncpy(buffer + 1, suspend_encryptor_name, str_size + 1);
+ buf_offset = str_size + 2;
+
+ *(buffer + buf_offset) = (char) suspend_encryptor_mode;
+ buf_offset++;
+
+ *(buffer + buf_offset) = (char) suspend_encryptor_save_key_and_iv;
+ buf_offset++;
+
+ if (suspend_encryptor_save_key_and_iv) {
+
+ str_size = strlen(suspend_encryptor_key);
+ *(buffer + buf_offset) = (char) str_size;
+ strncpy(buffer + buf_offset + 1, suspend_encryptor_key, str_size + 1);
+
+ buf_offset+= str_size + 2;
+
+ str_size = strlen(suspend_encryptor_iv);
+ *(buffer + buf_offset) = (char) str_size;
+ strncpy(buffer + buf_offset + 1, suspend_encryptor_iv, str_size + 1);
+
+ buf_offset += str_size + 2;
+ }
+
+ return buf_offset;
+}
+
+/* suspend_encrypt_load_config_info
+ *
+ * Description: Reload information needed for deencrypting the image at
+ * resume time.
+ * Arguments: Buffer: Pointer to the start of the data.
+ * Size: Number of bytes that were saved.
+ */
+static void suspend_encrypt_load_config_info(char *buffer, int size)
+{
+ int buf_offset, str_size;
+
+ str_size = (int) *buffer;
+ strncpy(suspend_encryptor_name, buffer + 1, str_size + 1);
+ buf_offset = str_size + 2;
+
+ suspend_encryptor_mode = (int) *(buffer + buf_offset);
+ buf_offset++;
+
+ suspend_encryptor_save_key_and_iv = (int) *(buffer + buf_offset);
+ buf_offset++;
+
+ if (suspend_encryptor_save_key_and_iv) {
+ str_size = (int) *(buffer + buf_offset);
+ strncpy(suspend_encryptor_key, buffer + buf_offset + 1, str_size + 1);
+
+ buf_offset+= str_size + 2;
+
+ str_size = (int) *(buffer + buf_offset);
+ strncpy(suspend_encryptor_iv, buffer + buf_offset + 1, str_size + 1);
+
+ buf_offset += str_size + 2;
+ } else {
+ *suspend_encryptor_key = 0;
+ *suspend_encryptor_iv = 0;
+ }
+
+ if (buf_offset != size) {
+ printk("Suspend Encryptor config info size mismatch (%d != %d): settings ignored.\n",
+ buf_offset, size);
+ *suspend_encryptor_key = 0;
+ *suspend_encryptor_iv = 0;
+ }
+ return;
+}
--
Nigel Cunningham nigel at suspend2 dot net
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