Implementing checksum validation for single-part and multipart downloads #3641
+161
−20
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Description of changes:
Implemented per-part checksum validation for downloads in TransferManager. Added validateChecksums flag (default: true) to TransferManagerConfiguration. Downloads now validate checksums for both single-part (via file read after download) and multipart transfers (per-part validation). Created GetChecksumFromResult() helper to reduce code duplication. Downloads fail immediately on checksum mismatch.
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