+rKtQ1h3Q==", "X-Minio-Internal-Server-Side-Encryption-Seal-Algorithm": "DAREv2-HMAC-SHA256", "content-type": "application/octet-stream", "etag": "20000f00e2c3709dc94905c6ce31e1cadbd1c064e14acdcd44cf0ac2db777eeedd88d639fcd64de16851ade8b21a9a1a"}, Parts: []ObjectPartInfo{{ETag: "", Number: 1, Size: 3430, ActualSize: 3398}}, Erasure: ErasureInfo{Algorithm: "reedsolomon", DataBlocks: 2, ParityBlocks: 2, BlockSize: 10485760, Index: 3, Distribution: []int{3, 4, 1, 2}, Checksums: []ChecksumInfo{{PartNumber:...

ciphertext  := sealed_chunk_0   ||       sealed_chunk_1   ||       sealed_chunk_2   ||       ...
```

In case of a S3 multi-part operation each part is en/decrypted with the scheme shown in Figure 1. However, for each part an unique secret key is derived from the OEK and the part number using a PRF. So in case of multi-part not the OEK but the output of `PRF(OEK, part_id)` is used as secret key.

#### Cryptographic Primitives

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