diff --git a/Makefile.util.def b/Makefile.util.def
index 3e8ae16f5..4d642a2b6 100644
--- a/Makefile.util.def
+++ b/Makefile.util.def
@@ -79,6 +79,7 @@ library = {
common = grub-core/lib/LzFind.c;
common = grub-core/lib/LzmaEnc.c;
common = grub-core/lib/pbkdf2.c;
+ common = grub-core/lib/crc.c;
common = grub-core/normal/datetime.c;
common = grub-core/normal/misc.c;
common = grub-core/partmap/acorn.c;
diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index ce10ba372..c62d7d12f 100644
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -905,6 +905,7 @@ module = {
module = {
name = btrfs;
common = fs/btrfs.c;
+ common = lib/crc.c;
};
module = {
diff --git a/grub-core/lib/crc.c b/grub-core/lib/crc.c
new file mode 100644
index 000000000..ffc3ef3b5
--- /dev/null
+++ b/grub-core/lib/crc.c
@@ -0,0 +1,75 @@
+/* crc.c - crc function */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2008 Free Software Foundation, Inc.
+ *
+ * GRUB 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see .
+ */
+
+#include
+#include
+
+static grub_uint32_t crc32c_table [256];
+
+static void
+init_crc32c_table (void)
+{
+ auto grub_uint32_t reflect (grub_uint32_t ref, int len);
+ grub_uint32_t reflect (grub_uint32_t ref, int len)
+ {
+ grub_uint32_t result = 0;
+ int i;
+
+ for (i = 1; i <= len; i++)
+ {
+ if (ref & 1)
+ result |= 1 << (len - i);
+ ref >>= 1;
+ }
+
+ return result;
+ }
+
+ grub_uint32_t polynomial = 0x1edc6f41;
+ int i, j;
+
+ for(i = 0; i < 256; i++)
+ {
+ crc32c_table[i] = reflect(i, 8) << 24;
+ for (j = 0; j < 8; j++)
+ crc32c_table[i] = (crc32c_table[i] << 1) ^
+ (crc32c_table[i] & (1 << 31) ? polynomial : 0);
+ crc32c_table[i] = reflect(crc32c_table[i], 32);
+ }
+}
+
+grub_uint32_t
+grub_getcrc32c (grub_uint32_t crc, const void *buf, int size)
+{
+ int i;
+ const grub_uint8_t *data = buf;
+
+ if (! crc32c_table[1])
+ init_crc32c_table ();
+
+ crc^= 0xffffffff;
+
+ for (i = 0; i < size; i++)
+ {
+ crc = (crc >> 8) ^ crc32c_table[(crc & 0xFF) ^ *data];
+ data++;
+ }
+
+ return crc ^ 0xffffffff;
+}
diff --git a/include/grub/lib/crc.h b/include/grub/lib/crc.h
new file mode 100644
index 000000000..c5098a8c3
--- /dev/null
+++ b/include/grub/lib/crc.h
@@ -0,0 +1,25 @@
+/* crc.h - prototypes for crc */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2008 Free Software Foundation, Inc.
+ *
+ * GRUB 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see .
+ */
+
+#ifndef GRUB_CRC_H
+#define GRUB_CRC_H 1
+
+grub_uint32_t grub_getcrc32c (grub_uint32_t crc, const void *buf, int size);
+
+#endif /* ! GRUB_CRC_H */