Scenario 1.d. func NewGCMForSSH(cipher *aes.Block) (*GCMWithCounterNonce, error) { g, err := newGCM(&GCM{}, cipher, gcmStandardNonceSize, gcmTagSize) if err != nil { return nil, err } return &GCMWithCounterNonce{g: *g}, nil } type GCMWithCounterNonce struct { g GCM prefixReady bool prefix uint32 startReady bool start uint64 next uint64 } func (g *GCMWithCounterNonce) NonceSize() int { return gcmStandardNonceSize } func (g *GCMWithCounterNonce) Overhead() int { return gcmTagSize } // Seal implements...