1 files changed, 40 insertions, 0 deletions
diff --git a/pkg/hash/hash.go b/pkg/hash/hash.go
new file mode 100644
index 000000000..4c45ba6e6
--- /dev/null
+++ b/pkg/hash/hash.go
@@ -0,0 +1,40 @@
+// Copyright 2016 syzkaller project authors. All rights reserved.
+// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
+
+package hash
+
+import (
+	"crypto/sha1"
+	"encoding/hex"
+	"fmt"
+)
+
+type Sig [sha1.Size]byte
+
+func Hash(data []byte) Sig {
+	return Sig(sha1.Sum(data))
+}
+
+func String(data []byte) string {
+	sig := Hash(data)
+	return sig.String()
+}
+
+func (sig *Sig) String() string {
+	return hex.EncodeToString((*sig)[:])
+}
+
+func FromString(str string) (Sig, error) {
+	bin, err := hex.DecodeString(str)
+	if err != nil {
+		return Sig{}, fmt.Errorf("failed to decode sig '%v': %v", str, err)
+	}
+	if len(bin) != len(Sig{}) {
+		return Sig{}, fmt.Errorf("failed to decode sig '%v': bad len", str)
+	}
+	var sig Sig
+	for i, v := range bin {
+		sig[i] = v
+	}
+	return sig, err
+}