fix(*): Vendored project dependencies

vendor/github.com/pjbgf/sha1cd/cgo/ubc_check.go

@@ -0,0 +1,28 @@
+package cgo
+
+// #include <ubc_check.h>
+// #include <stdlib.h>
+//
+// uint32_t check(const uint32_t W[80])
+// {
+//	 uint32_t ubc_dv_mask[DVMASKSIZE] = {(uint32_t)(0xFFFFFFFF)};
+//   ubc_check(W, ubc_dv_mask);
+//   return ubc_dv_mask[0];
+// }
+import "C"
+import (
+	"fmt"
+	"unsafe"
+)
+
+// CalculateDvMask takes as input an expanded message block and verifies the unavoidable
+// bitconditions for all listed DVs. It returns a dvmask where each bit belonging to a DV
+// is set if all unavoidable bitconditions for that DV have been met.
+// Thus, one needs to do the recompression check for each DV that has its bit set.
+func CalculateDvMask(W []uint32) (uint32, error) {
+	if len(W) < 80 {
+		return 0, fmt.Errorf("invalid input: len(W) must be 80, was %d", len(W))
+	}
+
+	return uint32(C.check((*C.uint32_t)(unsafe.Pointer(&W[0])))), nil
+}