Add the routine that processes pages being written in the image.
Signed-off-by: Nigel Cunningham <[email protected]>
kernel/power/encryption.c | 51 +++++++++++++++++++++++++++++++++++++++++++--
1 files changed, 49 insertions(+), 2 deletions(-)
diff --git a/kernel/power/encryption.c b/kernel/power/encryption.c
index 98b0114..16a275b 100644
--- a/kernel/power/encryption.c
+++ b/kernel/power/encryption.c
@@ -125,11 +125,13 @@ static int suspend_encrypt_rw_prepare(in
return 1;
}
- if (!(suspend_encryptor_transform = crypto_alloc_tfm(suspend_encryptor_name,
- 1 << suspend_encryptor_mode))) {
+ suspend_encryptor_transform = crypto_alloc_tfm(suspend_encryptor_name,
+ 1 << suspend_encryptor_mode);
+ if (!suspend_encryptor_transform) {
printk("Suspend2: Failed to initialise the encryption "
"transform (%s, mode %d).\n",
suspend_encryptor_name, suspend_encryptor_mode);
+ suspend_encryption_ops.disabled = 1;
return 1;
}
@@ -157,3 +159,48 @@ static int suspend_encrypt_rw_prepare(in
return 0;
}
+/* ---- Exported functions ---- */
+
+/* suspend_encrypt_write_chunk()
+ *
+ * Description: Encrypt a page of data, buffering output and passing on
+ * filled pages to the next module in the pipeline.
+ * Arguments: Buffer_page: Pointer to a buffer of size PAGE_SIZE,
+ * containing data to be encrypted.
+ * Returns: 0 on success. Otherwise the error is that returned by later
+ * modules, -ECHILD if we have a broken pipeline or -EIO if
+ * zlib errs.
+ */
+static int suspend_encrypt_write_chunk(struct page *buffer_page)
+{
+ int ret;
+ unsigned int len;
+ u16 len_written;
+ char *buffer_start;
+
+ if (!suspend_encryptor_transform)
+ return next_driver->write_chunk(buffer_page);
+
+ buffer_start = kmap(buffer_page);
+ memcpy(page_buffer, buffer_start, PAGE_SIZE);
+ kunmap(buffer_page);
+
+ bytes_in += PAGE_SIZE;
+
+ len = PAGE_SIZE;
+
+ ret = crypto_cipher_encrypt(suspend_encryptor_transform,
+ suspend_crypt_sg, suspend_crypt_sg, PAGE_SIZE);
+
+ if (ret) {
+ printk("Encryption failed.\n");
+ return -EIO;
+ }
+
+ len_written = (u16) len;
+
+ ret = next_driver->write_chunk(virt_to_page(page_buffer));
+
+ return ret;
+}
+
--
Nigel Cunningham nigel at suspend2 dot net
-
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