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Chris Lu
ff16a90bb0
Apply the same fix as the previous two commits to createMultipartSSECDecryptedReaderDirect: per-chunk SSE-C metadata is validated upfront (IV decode, IV length check, non-negative PartOffset), but the volume-server GET and CreateSSECDecryptedReader- WithOffset wrap fire lazily through lazyMultipartChunkReader. At most one chunk body is live at any time. This is the same eager-open-all-chunks shape that produced #8908's truncated GETs for SSE-S3; SSE-C multipart objects with many chunks were exposed to the same idle-keepalive failure mode under concurrent load. The pre-existing TODO note about CopyObject SSE-C PartOffset handling is preserved verbatim. The wire format on disk is unchanged (same per-chunk metadata, same encrypted bytes); existing SSE-C multipart objects read back identically. After this commit all three multipart SSE read paths (SSE-S3, SSE-KMS, SSE-C) share lazyMultipartChunkReader as their streaming engine.