object/id: Add algorithm

1 files changed, 17 insertions, 0 deletions

diff --git a/object/id/algorithm.go b/object/id/algorithm.go
new file mode 100644
index 00000000..47a1b02a
--- /dev/null
+++ b/object/id/algorithm.go
@@ -0,0 +1,17 @@
+package id
+
+// Algorithm identifies the hash algorithm used for Git object IDs.
+type Algorithm uint8
+
+const (
+	// AlgorithmUnknown identifies an unknown object ID hash algorithm.
+	AlgorithmUknown Algorithm = iota
+
+	// AlgorithmSHA1 identifies the SHA-1 object ID hash algorithm.
+	// This is the default for all versions of Git until Git 3.0.
+	AlgorithmSHA1
+
+	// AlgorithmSHA256 identifies the SHA-256 object ID hash algorithm.
+	// This is the default for Git 3.0 and beyond.
+	AlgorithmSHA256
+)