Fast CRC implementations ported from Intel's efforts

Provides fast CRC32C with PCLMULQDQ instructions in Golang

The white papers on CRC32C calculations with PCLMULQDQ instruction can be
  downloaded from:

http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/crc-iscsi-polynomial-crc32-instruction-paper.pdf
http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/fast-crc-computation-paper.pdf

pkgs/crc32c/crc32c.go

@@ -0,0 +1,23 @@
+// +build linux,amd64
+
+package crc32c
+
+// #include "crc32c.h"
+import "C"
+import (
+	"errors"
+	"unsafe"
+)
+
+func Crc32c(buffer []byte) (uint32, error) {
+	var length = len(buffer)
+	if length == 0 {
+		return 0, errors.New("Invalid input")
+	}
+
+	var cbuf *C.uint8_t
+	cbuf = (*C.uint8_t)(unsafe.Pointer(&buffer[0]))
+	crc := C.crc32c_pcl(cbuf, C.int32_t(length), C.uint32_t(0))
+
+	return uint32(crc), nil
+}