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This commit adds two functions for sealing/unsealing the etag (a.k.a. content MD5) in case of SSE single-part upload. Sealing the ETag is neccessary in case of SSE-S3 to preserve the security guarantees. In case of SSE-S3 AWS returns the content-MD5 of the plaintext object as ETag. However, we must not store the MD5 of the plaintext for encrypted objects. Otherwise it becomes possible for an attacker to detect equal/non-equal encrypted objects. Therefore we encrypt the ETag before storing on the backend. But we only need to encrypt the ETag (content-MD5) if the client send it - otherwise the client cannot verify it anyway.