[PATCH 3/9] Move fsverity_descriptor definition to libfsverity.h

[Jes Sorensen <jes.sorensen@gmail.com>]

From: Jes Sorensen <jsorensen@fb.com>

Signed-off-by: Jes Sorensen <jsorensen@fb.com>
---
 cmd_sign.c    | 19 +------------------
 libfsverity.h | 26 +++++++++++++++++++++++++-
 2 files changed, 26 insertions(+), 19 deletions(-)

diff --git a/cmd_sign.c b/cmd_sign.c
index dcc44f8..1792084 100644
--- a/cmd_sign.c
+++ b/cmd_sign.c
@@ -20,26 +20,9 @@
 #include <unistd.h>
 
 #include "commands.h"
-#include "fsverity_uapi.h"
+#include "libfsverity.h"
 #include "hash_algs.h"
 
-/*
- * Merkle tree properties.  The file measurement is the hash of this structure
- * excluding the signature and with the sig_size field set to 0.
- */
-struct fsverity_descriptor {
-	__u8 version;		/* must be 1 */
-	__u8 hash_algorithm;	/* Merkle tree hash algorithm */
-	__u8 log_blocksize;	/* log2 of size of data and tree blocks */
-	__u8 salt_size;		/* size of salt in bytes; 0 if none */
-	__le32 sig_size;	/* size of signature in bytes; 0 if none */
-	__le64 data_size;	/* size of file the Merkle tree is built over */
-	__u8 root_hash[64];	/* Merkle tree root hash */
-	__u8 salt[32];		/* salt prepended to each hashed block */
-	__u8 __reserved[144];	/* must be 0's */
-	__u8 signature[];	/* optional PKCS#7 signature */
-};
-
 /*
  * Format in which verity file measurements are signed.  This is the same as
  * 'struct fsverity_digest', except here some magic bytes are prepended to
diff --git a/libfsverity.h b/libfsverity.h
index ceebae1..396a6ee 100644
--- a/libfsverity.h
+++ b/libfsverity.h
@@ -13,13 +13,14 @@
 
 #include <stddef.h>
 #include <stdint.h>
+#include <linux/types.h>
 
 #define FS_VERITY_HASH_ALG_SHA256       1
 #define FS_VERITY_HASH_ALG_SHA512       2
 
 struct libfsverity_merkle_tree_params {
 	uint16_t version;
-	uint16_t hash_algorithm;
+	uint16_t hash_algorithm;	/* Matches the digest_algorithm type */
 	uint32_t block_size;
 	uint32_t salt_size;
 	const uint8_t *salt;
@@ -27,6 +28,7 @@ struct libfsverity_merkle_tree_params {
 };
 
 struct libfsverity_digest {
+	char magic[8];			/* must be "FSVerity" */
 	uint16_t digest_algorithm;
 	uint16_t digest_size;
 	uint8_t digest[];
@@ -38,4 +40,26 @@ struct libfsverity_signature_params {
 	uint64_t reserved[11];
 };
 
+/*
+ * Merkle tree properties.  The file measurement is the hash of this structure
+ * excluding the signature and with the sig_size field set to 0.
+ */
+struct fsverity_descriptor {
+	uint8_t version;	/* must be 1 */
+	uint8_t hash_algorithm;	/* Merkle tree hash algorithm */
+	uint8_t log_blocksize;	/* log2 of size of data and tree blocks */
+	uint8_t salt_size;	/* size of salt in bytes; 0 if none */
+	__le32 sig_size;	/* size of signature in bytes; 0 if none */
+	__le64 data_size;	/* size of file the Merkle tree is built over */
+	uint8_t root_hash[64];	/* Merkle tree root hash */
+	uint8_t salt[32];	/* salt prepended to each hashed block */
+	uint8_t __reserved[144];/* must be 0's */
+	uint8_t signature[];	/* optional PKCS#7 signature */
+};
+
+int
+libfsverity_compute_digest(int fd,
+			   const struct libfsverity_merkle_tree_params *params,
+			   struct libfsverity_digest **digest_ret);
+
 #endif
-- 
2.24.1