From a7c90583753453746cf9bd112eb148fe3f23b24f Mon Sep 17 00:00:00 2001
From: Andreas Auernhammer <aead@mail.de>
Date: Tue, 31 Jul 2018 20:15:12 +0200
Subject: [PATCH] crypto: implement Stringer for S3 and SSEC (#6216)

This commit adds a `fmt.Stringer` implementation for
SSE-S3 and SSE-C. The string representation is the
domain used for object key sealing.
See: `ObjectKey.Seal(...)` and `ObjectKey.Unseal(...)`
---
 cmd/crypto/sse.go      |  8 ++++++++
 cmd/crypto/sse_test.go | 31 +++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+)
 create mode 100644 cmd/crypto/sse_test.go

diff --git a/cmd/crypto/sse.go b/cmd/crypto/sse.go
index d1621783f..44415e2cc 100644
--- a/cmd/crypto/sse.go
+++ b/cmd/crypto/sse.go
@@ -65,6 +65,14 @@ const (
 	InsecureSealAlgorithm = "DARE-SHA256"
 )
 
+// String returns the SSE domain as string. For SSE-S3 the
+// domain is "SSE-S3".
+func (s3) String() string { return "SSE-S3" }
+
+// String returns the SSE domain as string. For SSE-C the
+// domain is "SSE-C".
+func (ssec) String() string { return "SSE-C" }
+
 // EncryptSinglePart encrypts an io.Reader which must be the
 // the body of a single-part PUT request.
 func EncryptSinglePart(r io.Reader, key ObjectKey) io.Reader {
diff --git a/cmd/crypto/sse_test.go b/cmd/crypto/sse_test.go
new file mode 100644
index 000000000..2d1ccb64a
--- /dev/null
+++ b/cmd/crypto/sse_test.go
@@ -0,0 +1,31 @@
+// Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 Minio, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package crypto
+
+import "testing"
+
+func TestS3String(t *testing.T) {
+	const Domain = "SSE-S3"
+	if domain := S3.String(); domain != Domain {
+		t.Errorf("S3's string method returns wrong domain: got '%s' - want '%s'", domain, Domain)
+	}
+}
+
+func TestSSECString(t *testing.T) {
+	const Domain = "SSE-C"
+	if domain := SSEC.String(); domain != Domain {
+		t.Errorf("SSEC's string method returns wrong domain: got '%s' - want '%s'", domain, Domain)
+	}
+}