lib: add shaStr

2 files changed, 21 insertions, 0 deletions

diff --git a/lib/hash.go b/lib/hash.go
index 8c8aeef..b636e17 100644
--- a/lib/hash.go
+++ b/lib/hash.go
@@ -21,3 +21,8 @@ func shaRotr(x uint32, n uint) uint32 {
 func shaRotl(x uint32, n uint) uint32 {
 	return (x << n) | (x >> (32 - n))
 }
+
+// Right Shift
+func shaShr(x uint32, n uint) uint32 {
+	return x >> n
+}
diff --git a/lib/hash_test.go b/lib/hash_test.go
new file mode 100644
index 0000000..bde6b3f
--- /dev/null
+++ b/lib/hash_test.go
@@ -0,0 +1,16 @@
+// Copyright © 2022 siddharth <s@ricketyspace.net>
+// SPDX-License-Identifier: ISC
+
+package lib
+
+import (
+	"testing"
+)
+
+func TestShaShr(t *testing.T) {
+	s := uint32(256)
+	sr := shaShr(s, 2)
+	if sr != s>>2 {
+		t.Errorf("shaShr test failed")
+	}
+}