org.bouncycastle.cert.plants.bc

Class BcSha256MerkleTreeHash

java.lang.Object

org.bouncycastle.cert.plants.bc.BcSha256MerkleTreeHash

All Implemented Interfaces:

MerkleTreeHash

public class BcSha256MerkleTreeHash
extends java.lang.Object
implements MerkleTreeHash

Lightweight SHA-256 implementation of MerkleTreeHash.

A fresh digest is created per call, so a single instance is thread-safe and can be shared (e.g. inside an MTCCertAuth or a MerkleTreeCertificateValidator.ValidationParams used by concurrent validations).

Constructor Summary

Constructors

Constructor and Description
BcSha256MerkleTreeHash()

Method Summary

Modifier and Type	Method and Description
org.bouncycastle.asn1.x509.AlgorithmIdentifier	getAlgorithmIdentifier()
int	getHashSize()
byte[]	hashLeaf(byte[] entry) Hash of a leaf entry: HASH(0x00 || entry).
byte[]	hashNode(byte[] left, byte[] right) Hash of an internal node: HASH(0x01 || left || right).
byte[]	hashRaw(byte[] data) Raw hash with no domain separation prefix: HASH(data).

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BcSha256MerkleTreeHash

public BcSha256MerkleTreeHash()

Method Detail

getAlgorithmIdentifier

public org.bouncycastle.asn1.x509.AlgorithmIdentifier getAlgorithmIdentifier()

Specified by:

getAlgorithmIdentifier in interface MerkleTreeHash

Returns:

the X.509 AlgorithmIdentifier that names this hash function. Used by MerkleTreeCertificateValidator to cross-check the supplied hash against the logHash field of the CA's id-pe-mtcCertificationAuthority extension.

getHashSize

public int getHashSize()

Specified by:

getHashSize in interface MerkleTreeHash

Returns:

the hash output size in bytes

hashLeaf

public byte[] hashLeaf(byte[] entry)

Description copied from interface: MerkleTreeHash

Hash of a leaf entry: HASH(0x00 || entry).

Specified by:

hashLeaf in interface MerkleTreeHash

Parameters:

entry - the raw entry bytes

Returns:

leaf hash

hashNode

public byte[] hashNode(byte[] left,
                       byte[] right)

Description copied from interface: MerkleTreeHash

Hash of an internal node: HASH(0x01 || left || right).

Specified by:

hashNode in interface MerkleTreeHash

Parameters:

left - left child hash

right - right child hash

Returns:

node hash

hashRaw

public byte[] hashRaw(byte[] data)

Description copied from interface: MerkleTreeHash

Raw hash with no domain separation prefix: HASH(data). Used for the subjectPublicKeyInfoHash in a TBSCertificateLogEntry (Section 5.3), which is computed with the log's hash function but without the leaf-node prefix.

Specified by:

hashRaw in interface MerkleTreeHash

Parameters:

data - the input bytes

Returns:

the hash output