S3 API: Add SSE-C (#7143)

* implement sse-c

* fix Content-Range

* adding tests

* Update s3_sse_c_test.go

* copy sse-c objects

* adding tests

* refactor

* multi reader

* remove extra write header call

* refactor

* SSE-C encrypted objects do not support HTTP Range requests

* robust

* fix server starts

* Update Makefile

* Update Makefile

* ci: remove SSE-C integration tests and workflows; delete test/s3/encryption/

* s3: SSE-C MD5 must be base64 (case-sensitive); fix validation, comparisons, metadata storage; update tests

* minor

* base64

* Update SSE-C_IMPLEMENTATION.md

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* Update weed/s3api/s3api_object_handlers.go

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* Update SSE-C_IMPLEMENTATION.md

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* address comments

* fix test

* fix compilation

---------

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

weed/s3api/s3api_object_handlers_put.go

@@ -190,6 +190,25 @@ func (s3a *S3ApiServer) PutObjectHandler(w http.ResponseWriter, r *http.Request)
 
 func (s3a *S3ApiServer) putToFiler(r *http.Request, uploadUrl string, dataReader io.Reader, destination string, bucket string) (etag string, code s3err.ErrorCode) {
 
+	// Handle SSE-C encryption if requested
+	customerKey, err := ParseSSECHeaders(r)
+	if err != nil {
+		glog.Errorf("SSE-C header validation failed: %v", err)
+		// Use shared error mapping helper
+		errCode := MapSSECErrorToS3Error(err)
+		return "", errCode
+	}
+
+	// Apply SSE-C encryption if customer key is provided
+	if customerKey != nil {
+		encryptedReader, encErr := CreateSSECEncryptedReader(dataReader, customerKey)
+		if encErr != nil {
+			glog.Errorf("Failed to create SSE-C encrypted reader: %v", encErr)
+			return "", s3err.ErrInternalError
+		}
+		dataReader = encryptedReader
+	}
+
 	hash := md5.New()
 	var body = io.TeeReader(dataReader, hash)