Add support for decrypting a page being read from the storage.
Signed-off-by: Nigel Cunningham <[email protected]>
kernel/power/encryption.c | 41 +++++++++++++++++++++++++++++++++++++++++
1 files changed, 41 insertions(+), 0 deletions(-)
diff --git a/kernel/power/encryption.c b/kernel/power/encryption.c
index 9b7dd93..cd26e84 100644
--- a/kernel/power/encryption.c
+++ b/kernel/power/encryption.c
@@ -238,3 +238,44 @@ static int suspend_encrypt_rw_init(int r
return 0;
}
+/* suspend_encrypt_read_chunk()
+ *
+ * Description: Retrieve data from later modules and deencrypt it until the
+ * input buffer is filled.
+ * Arguments: Buffer_start: Pointer to a buffer of size PAGE_SIZE.
+ * Sync: Whether the previous module (or core) wants its
+ * data synchronously.
+ * Returns: Zero if successful. Error condition from me or from downstream
+ * on failure.
+ */
+static int suspend_encrypt_read_chunk(struct page *buffer_page, int sync)
+{
+ int ret;
+ char *buffer_start;
+
+ if (!suspend_encryptor_transform)
+ return next_driver->read_chunk(buffer_page, sync);
+
+ /*
+ * All our reads must be synchronous - we can't deencrypt
+ * data that hasn't been read yet.
+ */
+
+ if ((ret = next_driver->read_chunk(
+ virt_to_page(page_buffer), SUSPEND_SYNC)) < 0) {
+ printk("Failed to read an encrypted block.\n");
+ return ret;
+ }
+
+ ret = crypto_cipher_decrypt(suspend_encryptor_transform,
+ suspend_crypt_sg, suspend_crypt_sg, PAGE_SIZE);
+
+ if (ret)
+ printk("Decrypt function returned %d.\n", ret);
+
+ buffer_start = kmap(buffer_page);
+ memcpy(buffer_start, page_buffer, PAGE_SIZE);
+ kunmap(buffer_page);
+ return ret;
+}
+
--
Nigel Cunningham nigel at suspend2 dot net
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