New on disk format - encryption

1 files changed, 47 insertions, 0 deletions

diff --git a/linux/crypto/blkcipher.c b/linux/crypto/blkcipher.c
new file mode 100644
index 00000000..31f91418
--- /dev/null
+++ b/linux/crypto/blkcipher.c
@@ -0,0 +1,47 @@
+/*
+ * Block chaining cipher operations.
+ *
+ * Generic encrypt/decrypt wrapper for ciphers, handles operations across
+ * multiple page boundaries by using temporary blocks.  In user context,
+ * the kernel is given a chance to schedule us once per page.
+ *
+ * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+#include <crypto/algapi.h>
+#include "internal.h"
+
+static unsigned crypto_blkcipher_ctxsize(struct crypto_alg *alg,
+					 u32 type, u32 mask)
+{
+	return alg->cra_ctxsize;
+}
+
+static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
+{
+	struct blkcipher_tfm *crt = &tfm->crt_blkcipher;
+	struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
+
+	BUG_ON((mask & CRYPTO_ALG_TYPE_MASK) != CRYPTO_ALG_TYPE_MASK);
+
+	crt->setkey	= alg->setkey;
+	crt->encrypt	= alg->encrypt;
+	crt->decrypt	= alg->decrypt;
+	return 0;
+}
+
+const struct crypto_type crypto_blkcipher_type = {
+	.ctxsize	= crypto_blkcipher_ctxsize,
+	.init		= crypto_init_blkcipher_ops,
+};