fix: invalid checksum on site replication with conforming checksum types (#21535)

cmd/bucket-replication.go

@@ -3797,14 +3797,13 @@ func getCRCMeta(oi ObjectInfo, partNum int, h http.Header) (cs map[string]string
 	meta := make(map[string]string)
 	cs, isMP = oi.decryptChecksums(partNum, h)
 	for k, v := range cs {
-		cksum := hash.NewChecksumString(k, v)
-		if cksum == nil {
+		if k == xhttp.AmzChecksumType {
 			continue
 		}
-		if cksum.Valid() {
-			meta[cksum.Type.Key()] = v
-			meta[xhttp.AmzChecksumType] = cs[xhttp.AmzChecksumType]
-			meta[xhttp.AmzChecksumAlgo] = cksum.Type.String()
+		cktype := hash.ChecksumStringToType(k)
+		if cktype.IsSet() {
+			meta[cktype.Key()] = v
+			meta[xhttp.AmzChecksumAlgo] = cktype.String()
 		}
 	}
 	return meta, isMP

cmd/erasure-multipart.go

@@ -1161,6 +1161,7 @@ func (er erasureObjects) CompleteMultipartUpload(ctx context.Context, bucket str
 				Err:    fmt.Errorf("checksum type mismatch. got %q (%s) expected %q (%s)", checksumType.String(), checksumType.ObjType(), opts.WantChecksum.Type.String(), opts.WantChecksum.Type.ObjType()),
 			}
 		}
+		checksumType |= hash.ChecksumMultipart | hash.ChecksumIncludesMultipart
 	}
 
 	var checksumCombined []byte

cmd/object-multipart-handlers.go

@@ -221,6 +221,10 @@ func (api objectAPIHandlers) NewMultipartUploadHandler(w http.ResponseWriter, r
 		opts.WantChecksum = &hash.Checksum{Type: checksumType}
 	}
 
+	if opts.WantChecksum != nil {
+		opts.WantChecksum.Type |= hash.ChecksumMultipart | hash.ChecksumIncludesMultipart
+	}
+
 	newMultipartUpload := objectAPI.NewMultipartUpload
 
 	res, err := newMultipartUpload(ctx, bucket, object, opts)