Package com.icodici.crypto.digest

Class Digest

java.lang.Object

com.icodici.crypto.digest.Digest

Direct Known Subclasses:

Crc32, Gost3411_2012_256, HMAC, Sha1, Sha256, Sha3_256, Sha3_384, Sha512, Sha512_256, Syntex1

public abstract class Digest
extends java.lang.Object

Abstract base class for all MAC funtions (sha1, crc32 and so on). Provides utility interface to it. Implementation must provide only #getLength(), #_update(byte[],int,int) and #_digest() methods.

The class provides many utility methods, direct digest calculation, string and stream digest and so on.

Created by sergeych on 07/01/16.

Constructor Summary

Constructors

Constructor	Description
Digest()

Method Summary

Modifier and Type	Method	Description
protected abstract byte[]	_digest()	Override it to calculate and return digest of all processed data.
protected abstract void	_update(byte[] data, int offset, int size)	Override to process sequence of bytes.
java.lang.String	base64Digest()
java.lang.String	base64Digest(byte[] data)
java.lang.String	base64Digest(java.io.InputStream in)
java.lang.String	base64Digest(java.lang.String data)
byte[]	digest()	Calculate and return message digest or return last calculated digest.
byte[]	digest(byte[] data)
byte[]	digest(java.io.InputStream in)
byte[]	digest(java.lang.String data)
protected int	getChunkSize()	The processing chunk size, used in HMAC/PRF implementations.
abstract int	getLength()	Override to provide digest length in bytes.
java.lang.String	hexDigest()
java.lang.String	hexDigest(byte[] data)
java.lang.String	hexDigest(java.io.InputStream in)
java.lang.String	hexDigest(java.lang.String data)
Digest	update(byte[] data)	Update digest using specified data.
void	update(byte[] data, int offset, int length)
Digest	update(int signleByte)	Update disgest with a single byte
Digest	update(java.lang.String data)	Update digest using specified string data, converted to the default encoding (e.g.

Methods inherited from class java.lang.Object

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

Constructor Detail

Digest

public Digest()

Method Detail

_update

protected abstract void _update(byte[] data,
                                int offset,
                                int size)

Override to process sequence of bytes. Is called only if the #_digest() was not called. Inner logic protects from update after digest is calculated.

Parameters:

data - source message

offset - index to start processing from

size - number of bytes to proces

_digest

protected abstract byte[] _digest()

Override it to calculate and return digest of all processed data. It is called only once per instance.

Returns:

digest

getLength

public abstract int getLength()

Override to provide digest length in bytes.

getChunkSize

protected int getChunkSize()

The processing chunk size, used in HMAC/PRF implementations.

Returns:

block size in bytes

update

public void update(byte[] data,
                   int offset,
                   int length)

digest

public byte[] digest()

Calculate and return message digest or return last calculated digest. It is save and effective to call #digest() multiple times. It is not allowed to call any of the update() methods after digest calculation.

Returns:

message digest

update

public Digest update(byte[] data)

Update digest using specified data. Can not be executed after any digest() call.

Parameters:

data -

Returns:

self

update

public Digest update(int signleByte)

Update disgest with a single byte

Parameters:

signleByte -

Returns:

self

update

public Digest update(java.lang.String data)

Update digest using specified string data, converted to the default encoding (e.g. UTF8) Can not be executed after any digest() call.

Parameters:

data - string

Returns:

self

digest

public byte[] digest(byte[] data)

hexDigest

public java.lang.String hexDigest()

hexDigest

public java.lang.String hexDigest(byte[] data)

hexDigest

public java.lang.String hexDigest(java.lang.String data)

base64Digest

public java.lang.String base64Digest(java.lang.String data)

base64Digest

public java.lang.String base64Digest(byte[] data)

base64Digest

public java.lang.String base64Digest()

digest

public byte[] digest(java.lang.String data)

digest

public byte[] digest(java.io.InputStream in)
              throws java.io.IOException

Throws:

java.io.IOException

base64Digest

public java.lang.String base64Digest(java.io.InputStream in)
                              throws java.io.IOException

Throws:

java.io.IOException

hexDigest

public java.lang.String hexDigest(java.io.InputStream in)
                           throws java.io.IOException

Throws:

java.io.IOException