JointPlaintextRange is the plaintext range corresponding to the sum of all "blocks" (complete blocks).

MinUint64 returns the minimum of two uint64 values.

New returns an initialized ContentEnc instance.

ParseHeader - parse "buf" into fileHeader object.

RandomHeader - create new fileHeader object with random Id.

CurrentVersion is the current On-Disk-Format version.

DefaultBS is the default plaintext block size.

DefaultIVBits is the default length of IV, in bits.

ExternalNonce derives a nonce from external sources.

HeaderLen is the total header length.

RandomNonce chooses a random nonce.

ReverseDeterministicNonce chooses a deterministic nonce, suitable for use in reverse mode.

ContentEnc is used to encipher and decipher file content.

FileHeader represents the header stored on each non-empty file.

IntraBlock identifies a part of a file block.

NonceMode determines how nonces are created.