gov.nist.secauto.swid.builder.resource

Class HashUtils

java.lang.Object

gov.nist.secauto.swid.builder.resource.HashUtils

public class HashUtils
extends Object

Method Summary

Modifier and Type	Method and Description
static byte[]	hash(HashAlgorithm algorithm, byte[] bytes) Generates a hash value, in the form of an array of bytes, by digesting a provided bytes based on the provided hash algorithm.
static byte[]	hash(HashAlgorithm algorithm, File file) Generates a hash value, in the form of an array of bytes, by digesting a provided input stream based on the provided hash algorithm.
static byte[]	hash(HashAlgorithm algorithm, InputStream is) Generates a hash value, in the form of an array of bytes, by digesting a provided input stream based on the provided hash algorithm.
static byte[]	processDigest(HashAlgorithm algorithm, byte[] mdbytes) Processes the provided hash value, truncating the value based on the width of the provided hash algorithm.
static byte[]	toArray(List<Byte> bytes) Converts a list of bytes into an array of bytes.
static byte[]	toBytes(String hashHexBytes)
static String	toHexString(byte[] bytes) Converts an array of bytes into a hexadecimal string.
static String	toHexString(List<Byte> bytes) Converts an list of bytes into a hexadecimal string.
static List<Byte>	toList(byte[] bytes) Converts an array of bytes into a list of bytes.

Methods inherited from class java.lang.Object

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

Method Detail

toList

public static List<Byte> toList(byte[] bytes)

Converts an array of bytes into a list of bytes.

Parameters:

bytes - the array of bytes to convert

Returns:

a list of bytes

toArray

public static byte[] toArray(List<Byte> bytes)

Converts a list of bytes into an array of bytes.

Parameters:

bytes - a list of bytes

Returns:

the array of bytes to convert

toHexString

public static String toHexString(byte[] bytes)

Converts an array of bytes into a hexadecimal string.

Parameters:

bytes - the array of bytes to convert

Returns:

a hexadecimal string

toHexString

public static String toHexString(List<Byte> bytes)

Converts an list of bytes into a hexadecimal string.

Parameters:

bytes - the list of bytes to convert

Returns:

a hexadecimal string

toBytes

public static byte[] toBytes(String hashHexBytes)

hash

public static byte[] hash(HashAlgorithm algorithm,
                          File file)
                   throws NoSuchAlgorithmException,
                          IOException

Generates a hash value, in the form of an array of bytes, by digesting a provided input stream based on the provided hash algorithm.

Parameters:

algorithm - the hash function to use

file - the file to read bytes from

Returns:

an array of bytes representing a hash value

Throws:

NoSuchAlgorithmException - if the selected hash function is not supported

IOException - if an error occured while reading the input stream

hash

public static byte[] hash(HashAlgorithm algorithm,
                          InputStream is)
                   throws NoSuchAlgorithmException,
                          IOException

Generates a hash value, in the form of an array of bytes, by digesting a provided input stream based on the provided hash algorithm.

Parameters:

algorithm - the hash function to use

is - the input stream to read bytes from

Returns:

an array of bytes representing a hash value

Throws:

NoSuchAlgorithmException - if the selected hash function is not supported

IOException - if an error occured while reading the input stream

hash

public static byte[] hash(HashAlgorithm algorithm,
                          byte[] bytes)
                   throws NoSuchAlgorithmException

Generates a hash value, in the form of an array of bytes, by digesting a provided bytes based on the provided hash algorithm.

Parameters:

algorithm - the hash function to use

bytes - the bytes to digest

Returns:

an array of bytes representing a hash value

Throws:

NoSuchAlgorithmException - if the selected hash function is not supported

processDigest

public static byte[] processDigest(HashAlgorithm algorithm,
                                   byte[] mdbytes)

Processes the provided hash value, truncating the value based on the width of the provided hash algorithm.

Parameters:

algorithm - the hash function to use

mdbytes - the digest bytes to truncate

Returns:

an array of bytes representing a hash value based on the width of the provided hash algorithm