1 files changed, 55 insertions, 0 deletions
diff --git a/fs/btrfs/crypto/hash.c b/fs/btrfs/crypto/hash.c
new file mode 100644
index 00000000000..fb51f6386cb
--- /dev/null
+++ b/fs/btrfs/crypto/hash.c
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/xxhash.h>
+#include <linux/unaligned/access_ok.h>
+#include <linux/types.h>
+#include <u-boot/sha256.h>
+#include <u-boot/crc.h>
+
+static u32 btrfs_crc32c_table[256];
+
+void btrfs_hash_init(void)
+{
+	static int inited = 0;
+
+	if (!inited) {
+		crc32c_init(btrfs_crc32c_table, 0x82F63B78);
+		inited = 1;
+	}
+}
+
+int hash_sha256(const u8 *buf, size_t length, u8 *out)
+{
+	sha256_context ctx;
+
+	sha256_starts(&ctx);
+	sha256_update(&ctx, buf, length);
+	sha256_finish(&ctx, out);
+
+	return 0;
+}
+
+int hash_xxhash(const u8 *buf, size_t length, u8 *out)
+{
+	u64 hash;
+
+	hash = xxh64(buf, length, 0);
+	put_unaligned_le64(hash, out);
+
+	return 0;
+}
+
+int hash_crc32c(const u8 *buf, size_t length, u8 *out)
+{
+	u32 crc;
+
+	crc = crc32c_cal((u32)~0, (char *)buf, length, btrfs_crc32c_table);
+	put_unaligned_le32(~crc, out);
+
+	return 0;
+}
+
+u32 crc32c(u32 seed, const void * data, size_t len)
+{
+	return crc32c_cal(seed, data, len, btrfs_crc32c_table);
+}