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Index ¶
Constants ¶
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const ( // MerkleTreeBufioSize is a default buffer size to use with bufio.Reader MerkleTreeBufioSize = memory.MiB // 1MB // RecommendedVHDSizeGB is the recommended size in GB for VHDs, which is not a hard limit. RecommendedVHDSizeGB = 128 * memory.GiB // VeritySignature is a value written to dm-verity super-block. VeritySignature = "verity" )
Variables ¶
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var ( ErrSuperBlockReadFailure = errors.New("failed to read dm-verity super block") ErrSuperBlockParseFailure = errors.New("failed to parse dm-verity super block") ErrRootHashReadFailure = errors.New("failed to read dm-verity root hash") ErrNotVeritySuperBlock = errors.New("invalid dm-verity super-block signature") )
Functions ¶
func ComputeAndWriteHashDevice ¶ added in v0.10.0
func ComputeAndWriteHashDevice(r io.ReadSeeker, w io.Writer) error
ComputeAndWriteHashDevice builds merkle tree from a given io.ReadSeeker and writes the result hash device (dm-verity super-block combined with merkle tree) to io.Writer.
func MerkleTree ¶
MerkleTree constructs dm-verity hash-tree for a given io.Reader with a fixed salt (0-byte) and algorithm (sha256).
func NewDMVeritySuperblock ¶
func NewDMVeritySuperblock(size uint64) *dmveritySuperblock
NewDMVeritySuperblock returns a dm-verity superblock for a device with a given size, salt, algorithm and versions are fixed.
Types ¶
type VerityInfo ¶
type VerityInfo struct {
// Offset in blocks on hash device
HashOffsetInBlocks int64
// Set to true, when dm-verity super block is also written on the hash device
SuperBlock bool
RootDigest string
Salt string
Algorithm string
DataBlockSize uint32
HashBlockSize uint32
DataBlocks uint64
Version uint32
}
VerityInfo is minimal exported version of dmveritySuperblock
func ReadDMVerityInfo ¶
func ReadDMVerityInfo(vhdPath string, offsetInBytes int64) (*VerityInfo, error)
ReadDMVerityInfo extracts dm-verity super block information and merkle tree root hash
func ReadDMVerityInfoReader ¶ added in v0.10.0
func ReadDMVerityInfoReader(r io.Reader) (*VerityInfo, error)
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