crypto: drbg - Export CTR DRBG DF functions

Export drbg_ctr_df() derivative function to new module df_sp80090.

Signed-off-by: Harsh Jain <h.jain@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

3 files changed, 82 insertions, 24 deletions

diff --git a/include/crypto/df_sp80090a.h b/include/crypto/df_sp80090a.h
new file mode 100644
index 000000000000..182865538662
--- /dev/null
+++ b/include/crypto/df_sp80090a.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+/*
+ * Copyright Stephan Mueller <smueller@chronox.de>, 2014
+ */
+
+#ifndef _CRYPTO_DF80090A_H
+#define _CRYPTO_DF80090A_H
+
+#include <crypto/internal/cipher.h>
+
+static inline int crypto_drbg_ctr_df_datalen(u8 statelen, u8 blocklen)
+{
+	return statelen +       /* df_data */
+		blocklen +      /* pad */
+		blocklen +      /* iv */
+		statelen + blocklen;  /* temp */
+}
+
+int crypto_drbg_ctr_df(struct crypto_cipher *tfm,
+		       unsigned char *df_data,
+		       size_t bytes_to_return,
+		       struct list_head *seedlist,
+		       u8 blocklen_bytes,
+		       u8 statelen);
+
+#endif /* _CRYPTO_DF80090A_H */
diff --git a/include/crypto/drbg.h b/include/crypto/drbg.h
index af5ad51d3eef..2d42518cbdce 100644
--- a/include/crypto/drbg.h
+++ b/include/crypto/drbg.h
@@ -47,6 +47,7 @@
 #include <linux/module.h>
 #include <linux/crypto.h>
 #include <linux/slab.h>
+#include <crypto/internal/drbg.h>
 #include <crypto/internal/rng.h>
 #include <crypto/rng.h>
 #include <linux/fips.h>
@@ -54,30 +55,6 @@
 #include <linux/list.h>
 #include <linux/workqueue.h>
 
-/*
- * Concatenation Helper and string operation helper
- *
- * SP800-90A requires the concatenation of different data. To avoid copying
- * buffers around or allocate additional memory, the following data structure
- * is used to point to the original memory with its size. In addition, it
- * is used to build a linked list. The linked list defines the concatenation
- * of individual buffers. The order of memory block referenced in that
- * linked list determines the order of concatenation.
- */
-struct drbg_string {
-	const unsigned char *buf;
-	size_t len;
-	struct list_head list;
-};
-
-static inline void drbg_string_fill(struct drbg_string *string,
-				    const unsigned char *buf, size_t len)
-{
-	string->buf = buf;
-	string->len = len;
-	INIT_LIST_HEAD(&string->list);
-}
-
 struct drbg_state;
 typedef uint32_t drbg_flag_t;
 
diff --git a/include/crypto/internal/drbg.h b/include/crypto/internal/drbg.h
new file mode 100644
index 000000000000..371e52dcee6c
--- /dev/null
+++ b/include/crypto/internal/drbg.h
@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+/*
+ * NIST SP800-90A DRBG derivation function
+ *
+ * Copyright (C) 2014, Stephan Mueller <smueller@chronox.de>
+ */
+
+#ifndef _INTERNAL_DRBG_H
+#define _INTERNAL_DRBG_H
+
+/*
+ * Convert an integer into a byte representation of this integer.
+ * The byte representation is big-endian
+ *
+ * @val value to be converted
+ * @buf buffer holding the converted integer -- caller must ensure that
+ *      buffer size is at least 32 bit
+ */
+static inline void drbg_cpu_to_be32(__u32 val, unsigned char *buf)
+{
+	struct s {
+		__be32 conv;
+	};
+	struct s *conversion = (struct s *)buf;
+
+	conversion->conv = cpu_to_be32(val);
+}
+
+/*
+ * Concatenation Helper and string operation helper
+ *
+ * SP800-90A requires the concatenation of different data. To avoid copying
+ * buffers around or allocate additional memory, the following data structure
+ * is used to point to the original memory with its size. In addition, it
+ * is used to build a linked list. The linked list defines the concatenation
+ * of individual buffers. The order of memory block referenced in that
+ * linked list determines the order of concatenation.
+ */
+struct drbg_string {
+	const unsigned char *buf;
+	size_t len;
+	struct list_head list;
+};
+
+static inline void drbg_string_fill(struct drbg_string *string,
+				    const unsigned char *buf, size_t len)
+{
+	string->buf = buf;
+	string->len = len;
+	INIT_LIST_HEAD(&string->list);
+}
+
+#endif //_INTERNAL_DRBG_H