Restructure codebase move crypto, checksum to top-level, move `split` into donut, move crypto/keys into api/auth

pkg/hash/crc32c/crc32c_intel_linux.go

@@ -0,0 +1,28 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+// Golang project:
+//    https://github.com/golang/go/blob/master/LICENSE
+
+// Using this part of Minio codebase under the license
+// Apache License Version 2.0 with modifications
+
+// Package crc32 implements the 32-bit cyclic redundancy check, or CRC-32,
+// checksum. See http://en.wikipedia.org/wiki/Cyclic_redundancy_check for
+// information.
+
+package crc32c
+
+// #include <stdint.h>
+// uint32_t crc32c_pcl(uint8_t *buf, int32_t len, uint32_t prev_crc);
+import "C"
+import (
+	"unsafe"
+)
+
+func updateCastanagoliPCL(crc uint32, p []byte) uint32 {
+	if len(p) == 0 {
+		return 0
+	}
+	return uint32(C.crc32c_pcl((*C.uint8_t)(unsafe.Pointer(&p[0])), C.int32_t(len(p)), C.uint32_t(crc)))
+}