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-rw-r--r--fs/ubifs/crypto.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/fs/ubifs/crypto.c b/fs/ubifs/crypto.c
index 25bb2062b8a3..aefa3c30b73b 100644
--- a/fs/ubifs/crypto.c
+++ b/fs/ubifs/crypto.c
@@ -35,6 +35,57 @@ static int ubifs_key_prefix(struct inode *inode, u8 **key)
return sizeof(prefix) - 1;
}
+int ubifs_encrypt(const struct inode *inode, struct ubifs_data_node *dn,
+ unsigned int in_len, unsigned int *out_len, int block)
+{
+ struct ubifs_info *c = inode->i_sb->s_fs_info;
+ void *p = &dn->data;
+ struct page *ret;
+ unsigned int pad_len = round_up(in_len, UBIFS_CIPHER_BLOCK_SIZE);
+
+ ubifs_assert(pad_len <= *out_len);
+ dn->compr_size = cpu_to_le16(in_len);
+
+ /* pad to full block cipher length */
+ if (pad_len != in_len)
+ memset(p + in_len, 0, pad_len - in_len);
+
+ ret = fscrypt_encrypt_page(inode, virt_to_page(&dn->data), pad_len,
+ offset_in_page(&dn->data), block, GFP_NOFS);
+ if (IS_ERR(ret)) {
+ ubifs_err(c, "fscrypt_encrypt_page failed: %ld", PTR_ERR(ret));
+ return PTR_ERR(ret);
+ }
+ *out_len = pad_len;
+
+ return 0;
+}
+
+int ubifs_decrypt(const struct inode *inode, struct ubifs_data_node *dn,
+ unsigned int *out_len, int block)
+{
+ struct ubifs_info *c = inode->i_sb->s_fs_info;
+ int err;
+ unsigned int clen = le16_to_cpu(dn->compr_size);
+ unsigned int dlen = *out_len;
+
+ if (clen <= 0 || clen > UBIFS_BLOCK_SIZE || clen > dlen) {
+ ubifs_err(c, "bad compr_size: %i", clen);
+ return -EINVAL;
+ }
+
+ ubifs_assert(dlen <= UBIFS_BLOCK_SIZE);
+ err = fscrypt_decrypt_page(inode, virt_to_page(&dn->data), dlen,
+ offset_in_page(&dn->data), block);
+ if (err) {
+ ubifs_err(c, "fscrypt_decrypt_page failed: %i", err);
+ return err;
+ }
+ *out_len = clen;
+
+ return 0;
+}
+
struct fscrypt_operations ubifs_crypt_operations = {
.flags = FS_CFLG_INPLACE_ENCRYPTION,
.get_context = ubifs_crypt_get_context,