Class FileHashHandler

java.lang.Object

lib.pwss.hash.file_hash_handler.FileHashHandler

All Implemented Interfaces:

FileHash

public final class FileHashHandler
extends Object
implements FileHash

The FileHashHandler class provides methods for calculating hash values of a file using various hashing algorithms. This includes SHA-256, SHA-3 (256), and BLAKE2b. It returns the calculated hash values in a structured format.

Field Summary

Fields

Modifier and Type	Field	Description
protected final String	BLAKE_2B_PRINT_PREFIX	Prefix for BLAKE2b hash output.
protected final int	DIGEST_SIZE_BLAKE_2B	Digest size for BLAKE2b algorithm in bytes.
protected final String	ERROR	Error string constant.
protected final String	SHA256_PRINT_PREFIX	Prefix for SHA-256 hash output.
protected final String	SHA3_PRINT_PREFIX	Prefix for SHA3 hash output.

Constructor Summary

Constructors

Constructor	Description
FileHashHandler()	Public Constructor

Method Summary

Modifier and Type	Method	Description
protected final String	bytesToHex(byte[] bytes)	Convert a byte sequence to its hexadecimal string representation.
final String	calculateBlake2bHash(File file)	Calculates the Blake2B Hash of a file
final String	calculateSha256Hash(File file)	Calculates the SHA256 Hash of a file
final String	calculateSha3Hash(File file)	Calculates the SHA3 Hash of a file
final HashForFilesOutput	GetAllHashes(File file)	Calculates hashes of three different algorithms (SHA2,SHA3, BLAKE_2B) of a file

Methods inherited from class Object

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

Methods inherited from interface FileHash

GetAllHashes

Field Details

DIGEST_SIZE_BLAKE_2B

protected final int DIGEST_SIZE_BLAKE_2B

Digest size for BLAKE2b algorithm in bytes.

See Also:

• Constant Field Values

ERROR

protected final String ERROR

Error string constant.

See Also:

• Constant Field Values

SHA256_PRINT_PREFIX

protected final String SHA256_PRINT_PREFIX

Prefix for SHA-256 hash output.

See Also:

• Constant Field Values

SHA3_PRINT_PREFIX

protected final String SHA3_PRINT_PREFIX

Prefix for SHA3 hash output.

See Also:

• Constant Field Values

BLAKE_2B_PRINT_PREFIX

protected final String BLAKE_2B_PRINT_PREFIX

Prefix for BLAKE2b hash output.

See Also:

• Constant Field Values

Constructor Details

FileHashHandler

public FileHashHandler()

Public Constructor

Method Details

calculateSha256Hash

public final String calculateSha256Hash(File file)

Calculates the SHA256 Hash of a file

Specified by:

calculateSha256Hash in interface FileHash

Parameters:

file - to extract hash from

Returns:

A string containing the hexadecimal representation of the bytes in SHA2 Hash

calculateSha3Hash

public final String calculateSha3Hash(File file)

Calculates the SHA3 Hash of a file

Specified by:

calculateSha3Hash in interface FileHash

Parameters:

file - to extract hash from

Returns:

A string containing the hexadecimal representation of the bytes in SHA3 Hash

calculateBlake2bHash

public final String calculateBlake2bHash(File file)

Calculates the Blake2B Hash of a file

Specified by:

calculateBlake2bHash in interface FileHash

Parameters:

file - to extract hash from

Returns:

A string containing the hexadecimal representation of the bytes in a Blake2B Hash

bytesToHex

protected final String bytesToHex(byte[] bytes)

Convert a byte sequence to its hexadecimal string representation. This function takes a bytes object and returns a string containing two hexadecimal digits for each byte in the input, using lowercase letters.

Parameters:

bytes - (bytes): The byte sequence to be converted to hexadecimal.

Returns:

str: A string containing the hexadecimal representation of the bytes.

GetAllHashes

public final HashForFilesOutput GetAllHashes(File file)

Calculates hashes of three different algorithms (SHA2,SHA3, BLAKE_2B) of a file

Parameters:

file - The file to extract hash from

Returns:

A wrapper object containing the file and the three resulting hash strings