integrity

Documentation

Index

• Constants
• func GenerateAndAppend(snapPath string) (err error)
• type IntegrityDataHeader
  • func (integrityDataHeader *IntegrityDataHeader) Decode(input []byte) error
  • func (integrityDataHeader IntegrityDataHeader) Encode() ([]byte, error)

Constants

const (

	// For now that the header only includes a fixed-size string and a fixed-size hash,
	// the header size is always gonna be less than blockSize and will always get aligned
	// to blockSize.
	HeaderSize = 4096
)

Functions

func GenerateAndAppend

func GenerateAndAppend(snapPath string) (err error)

GenerateAndAppend generates integrity data for a snap file and appends them to it. Integrity data are formed from a fixed-size header aligned to blockSize which includes the root hash followed by the generated dm-verity hash data.

Types

type IntegrityDataHeader

type IntegrityDataHeader struct {
	Type     string        `json:"type"`
	Size     uint64        `json:"size,string"`
	DmVerity dmverity.Info `json:"dm-verity"`
}

IntegrityDataHeader gets appended first at the end of a squashfs packed snap before the dm-verity data. Size field includes the header size

func (*IntegrityDataHeader) Decode

func (integrityDataHeader *IntegrityDataHeader) Decode(input []byte) error

Decode unserializes an null-terminated byte array containing JSON data to an IntegrityDataHeader struct.

func (IntegrityDataHeader) Encode

func (integrityDataHeader IntegrityDataHeader) Encode() ([]byte, error)

Encode serializes an IntegrityDataHeader struct to a null terminated json string.