java.lang.Object
- com.authlete.common.util.digest.Digest

All Implemented Interfaces:: Cloneable

public class Digest
extends Object
implements Cloneable

A wrapper class over MessageDigest with many update methods in a fluent style, meaning update methods can be chained.

update methods are provided for all the primitive types and String, and their array types. In addition, updateJson(String) has been available since the version 1.2 which updates the digest with the content of the given JSON. Note that update(String) and updateJson(String) are different.

getInstanceXXX methods (where XXX is a pre-defined algorithm name with hyphens removed) such as getInstanceSHA1() are provided. They won't throw NoSuchAlgorithmException.

 
 // Compute SHA-1 of "Hello, world.".
 // 'digest' will have "2ae01472317d1935a84797ec1983ae243fc6aa28".
 String digest = Digest.getInstanceSHA1()
                 .update("Hello, world.")
                 .digestAsString();

 // Compute SHA-1 of "Hello, world." and get the result as Base64.
 // 'digest' will have "KuAUcjF9GTWoR5fsGYOuJD/Gqig=".
 String digest = Digest.getInstanceSHA1()
                 .update("Hello, world.")
                 .digestAsString(new Base64());

 // Compute SHA-1 of two JSONs.
 // 'result1' and 'result2' will have the same value.
 String json1 = "{ \"key1\":\"value1\", \"key2\":\"value2\" }";
 String json2 = "{ \"key2\":\"value2\", \"key1\":\"value1\" }";
 String result1 = Digest.getInstanceSHA1().updateJson(json1).digestAsString();
 String result2 = Digest.getInstanceSHA1().updateJson(json2).digestAsString();

Since:: 4.23
Author:: Takahiko Kawasaki

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class Digest.Feature
Features to control behaviors.

Constructor Summary

Constructors
Constructor	Description
`Digest(String algorithm)`	Constructor with an algorithm name.
`Digest(String algorithm, String provider)`	Constructor with an algorithm name and a provider.
`Digest(String algorithm, Provider provider)`	Constructor with an algorithm name and a provider.
`Digest(MessageDigest messageDigest)`	Constructor with a `MessageDigest` instance.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static String`	`bytesToHex(byte[] bytes)`	Convert the given byte array to a hex string.
`Object`	`clone()`	Get a clone of this `Digest` instance.
`byte[]`	`digest()`	Complete the hash computation.
`byte[]`	`digest(byte[] input)`	Perform the final update with the given byte array, and then complete the hash computation.
`int`	`digest(byte[] output, int offset, int length)`	Complete the hash computation.
`String`	`digestAsString()`	Complete the hash computation and get the resulting hash value as a hex string.
`String`	`digestAsString(byte[] input)`	Perform the final update with the given byte array, and then complete the hash computation and get the resulting hash value as a hex string.
`String`	`digestAsString(byte[] input, org.apache.commons.codec.BinaryEncoder encoder)`	Perform the final update with the given byte array, and then complete the hash computation and get the resulting hash value as a string.
`String`	`digestAsString(org.apache.commons.codec.BinaryEncoder encoder)`	Complete the hash computation and get the resulting hash value as a string.
`String`	`getAlgorithm()`	Get the algorithm name.
`int`	`getDigestLength()`	Get the length of the digest in bytes.
`static Digest`	`getInstance(String algorithm)`	Create a `Digest` instance with the specified algorithm.
`static Digest`	`getInstance(String algorithm, String provider)`	Create a `Digest` instance with the specified algorithm.
`static Digest`	`getInstance(String algorithm, Provider provider)`	Create a `Digest` instance with the specified algorithm.
`static Digest`	`getInstanceMD2()`	Create a `Digest` instance that implements MD2.
`static Digest`	`getInstanceMD5()`	Create a `Digest` instance that implements MD5.
`static Digest`	`getInstanceSHA1()`	Create a `Digest` instance that implements SHA-1.
`static Digest`	`getInstanceSHA256()`	Create a `Digest` instance that implements SHA-256.
`static Digest`	`getInstanceSHA384()`	Create a `Digest` instance that implements SHA-384.
`static Digest`	`getInstanceSHA512()`	Create a `Digest` instance that implements SHA-512.
`Provider`	`getProvider()`	Get the provider.
`MessageDigest`	`getWrappedMessageDigest()`	Get the wrapped `MessageDigest` instance.
`boolean`	`isEnabled(Digest.Feature feature)`	Check if the specified feature is enabled.
`Digest`	`reset()`	Reset the wrapped `MessageDigest` instance.
`Digest`	`setEnabled(Digest.Feature feature, boolean enabled)`	Enable or disable the specified feature.
`Digest`	`update(boolean input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(boolean[] input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(boolean[] input, int offset, int length)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(byte input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(byte[] input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(byte[] input, int offset, int length)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(char input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(char[] input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(char[] input, int offset, int length)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(double input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(double[] input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(double[] input, int offset, int length)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(float input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(float[] input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(float[] input, int offset, int length)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(int input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(int[] input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(int[] input, int offset, int length)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(long input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(long[] input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(long[] input, int offset, int length)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(short input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(short[] input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(short[] input, int offset, int length)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(Boolean input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(Boolean[] input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(Boolean[] input, int offset, int length)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(Character input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(Character[] input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(Character[] input, int offset, int length)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(Iterable<?> input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(Number number)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(Object input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(Object... input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(String input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(String[] input)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(String[] input, int offset, int length)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`update(ByteBuffer input)`	Update the wrapped `MessageDigest` object with the given input data.
`<TNumber extends Number> Digest`	`update(TNumber[] input)`	Update the wrapped `MessageDigest` object with the given input data.
`<TNumber extends Number> Digest`	`update(TNumber[] input, int offset, int length)`	Update the wrapped `MessageDigest` object with the given input data.
`Digest`	`updateJson(String json)`	Update the wrapped `MessageDigest` object with the given JSON.

Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail
- Digest
```
public Digest(MessageDigest messageDigest)
```
  Constructor with a MessageDigest instance.
  
  Parameters:
  
  messageDigest - A MessageDigest instance wrapped in this Digest instance.
  
  Throws:
  
  IllegalArgumentException - The given argument is null.
- Digest
```
public Digest(String algorithm)
       throws NoSuchAlgorithmException
```
  Constructor with an algorithm name.
  This constructor is equivalent to this(MessageDigest.getInstance(algorithm)).
  
  Parameters:
  
  algorithm - Algorithm name such as "MD5" and "SHA-1".
  
  Throws:
  
  NoSuchAlgorithmException - No provider supports the specified algorithm.
- Digest
```
public Digest(String algorithm,
              String provider)
       throws NoSuchAlgorithmException,
              NoSuchProviderException
```
  Constructor with an algorithm name and a provider.
  This constructor is equivalent to this(MessageDigest.getInstance(algorithm, provider)).
  
  Parameters:
  
  algorithm - Algorithm name such as "MD5" and "SHA-1".
  
  provider - Provider name.
  
  Throws:
  
  NoSuchAlgorithmException - The provider does not support the specified algorithm.
  
  NoSuchProviderException - The specified provider is not registered in the security provider list.
- Digest
```
public Digest(String algorithm,
              Provider provider)
       throws NoSuchAlgorithmException
```
  Constructor with an algorithm name and a provider.
  This constructor is equivalent to this(MessageDigest.getInstance(algorithm, provider)).
  
  Parameters:
  
  algorithm - Algorithm name such as "MD5" and "SHA-1".
  
  provider - Provider.
  
  Throws:
  
  NoSuchAlgorithmException - The provider does not support the specified algorithm.

Method Detail

getInstance
```
public static Digest getInstance(String algorithm)
                          throws NoSuchAlgorithmException
```
Create a Digest instance with the specified algorithm.
This method creates a MessageDigest instance by MessageDigest.getInstance(String) and wraps it in a Digest instance.

Parameters:

algorithm - Algorithm name such as "MD5" and "SHA-1".

Returns:

A Digest instance that implements the specified algorithm.

Throws:

NoSuchAlgorithmException - No provider supports the specified algorithm.

getInstance
```
public static Digest getInstance(String algorithm,
                                 String provider)
                          throws NoSuchAlgorithmException,
                                 NoSuchProviderException
```
Create a Digest instance with the specified algorithm.
This method creates a MessageDigest instance by MessageDigest.getInstance(String, String) and wraps it in a Digest instance.

Parameters:

algorithm - Algorithm name such as "MD5" and "SHA-1".

provider - Provider name.

Returns:

A Digest instance that implements the specified algorithm.

Throws:

NoSuchAlgorithmException - The provider does not support the specified algorithm.

NoSuchProviderException - The specified provider is not registered in the security provider list.

getInstance
```
public static Digest getInstance(String algorithm,
                                 Provider provider)
                          throws NoSuchAlgorithmException
```
Create a Digest instance with the specified algorithm.
This method creates a MessageDigest instance by MessageDigest.getInstance(String, Provider) and wraps it in a Digest instance.

Parameters:

algorithm - Algorithm name such as "MD5" and "SHA-1".

provider - Provider.

Returns:

A Digest instance that implements the specified algorithm.

Throws:

NoSuchAlgorithmException - The provider does not support the specified algorithm.

getInstanceMD2
```
public static Digest getInstanceMD2()
```
Create a Digest instance that implements MD2.

Returns:

A Digest instance that implements MD2.

getInstanceMD5
```
public static Digest getInstanceMD5()
```
Create a Digest instance that implements MD5.

Returns:

A Digest instance that implements MD5.

getInstanceSHA1
```
public static Digest getInstanceSHA1()
```
Create a Digest instance that implements SHA-1.

Returns:

A Digest instance that implements SHA-1.

getInstanceSHA256
```
public static Digest getInstanceSHA256()
```
Create a Digest instance that implements SHA-256.

Returns:

A Digest instance that implements SHA-256.

getInstanceSHA384
```
public static Digest getInstanceSHA384()
```
Create a Digest instance that implements SHA-384.

Returns:

A Digest instance that implements SHA-384.

getInstanceSHA512
```
public static Digest getInstanceSHA512()
```
Create a Digest instance that implements SHA-512.

Returns:

A Digest instance that implements SHA-512.

getAlgorithm
```
public String getAlgorithm()
```
Get the algorithm name.
This method just calls getAlgorithm() of the wrapped MessageDigest instance.

Returns:

Algorithm name.

getDigestLength
```
public int getDigestLength()
```
Get the length of the digest in bytes.
This method just calls getDigestLength() of the wrapped MessageDigest instance.

Returns:

Length of the digest in bytes.

getProvider
```
public Provider getProvider()
```
Get the provider.
This method just calls getProvider() of the wrapped MessageDigest instance.

Returns:

Provider.

getWrappedMessageDigest
```
public MessageDigest getWrappedMessageDigest()
```
Get the wrapped MessageDigest instance.

Returns:

The MessageDigest instance that has been given to the constructor.

clone
```
public Object clone()
             throws CloneNotSupportedException
```
Get a clone of this Digest instance.

Overrides:

clone in class Object

Returns:

A cloned object.

Throws:

CloneNotSupportedException - The implementation does not support clone operation.

digest
```
public byte[] digest()
```
Complete the hash computation. The digest is reset after this call is made.
This method just calls digest() method of the wrapped MessageDigest instance.

Returns:

The resulting hash value.

digest
```
public byte[] digest(byte[] input)
```
Perform the final update with the given byte array, and then complete the hash computation. The digest is reset after this call is made.
This method just calls digest(byte[]) method of the wrapped MessageDigest instance.

Parameters:

input - Byte array used for the last update.

Returns:

The resulting hash value.

digest
```
public int digest(byte[] output,
                  int offset,
                  int length)
           throws DigestException
```
Complete the hash computation. The digest is reset after this call is made.
This method just calls digest(byte[], int, int) method of the wrapped MessageDigest instance.

Parameters:

output - Output buffer for the computed digest.

offset - Offset into the output buffer to begin storing the digest.

length - Number of bytes within the output buffer allotted for the digest.

Returns:

The resulting hash value.

Throws:

DigestException - The digest method of the MessageDigest class failed.

digestAsString
```
public String digestAsString()
```
Complete the hash computation and get the resulting hash value as a hex string. The digest is reset after this call is made.
This method calls digest() method and converts the result to a String object.

Returns:

The result hash value represented in a hex String.

digestAsString
```
public String digestAsString(byte[] input)
```
Perform the final update with the given byte array, and then complete the hash computation and get the resulting hash value as a hex string. The digest is reset after this call is made.
This method calls digest(byte[]) method and converts the result to a String object.

Parameters:

input - Byte array used for the last update.

Returns:

The result hash value represented in a hex String.

digestAsString
```
public String digestAsString(org.apache.commons.codec.BinaryEncoder encoder)
```
Complete the hash computation and get the resulting hash value as a string. The given encoder is used to convert the digest value to a string.
This method is an alias of digestAsString((byte[])null, encoder).

Parameters:

encoder - Encoder to convert a digest value to a byte array whose elements are printable characters. For example, Base64.

Returns:

The result hash value encoded by the encoder.

Throws:

RuntimeException - If the encoder throws EncoderException, a RuntimeException wrapping the EncoderException is thrown.

digestAsString
```
public String digestAsString(byte[] input,
                             org.apache.commons.codec.BinaryEncoder encoder)
```
Perform the final update with the given byte array, and then complete the hash computation and get the resulting hash value as a string. The given encoder is used to convert the digest value to a string.

Parameters:

input - Byte array used for the last update. If null is given, it is just ignored.

encoder - Encoder to convert a digest value to a byte array whose elements are printable characters. For example, Base64.

Returns:

The result hash value encoded by the encoder.

Throws:

IllegalArgumentException - encoder is null.

RuntimeException - If the encoder throws EncoderException, a RuntimeException wrapping the EncoderException is thrown.

reset
```
public Digest reset()
```
Reset the wrapped MessageDigest instance.

Returns:

this object.

update
```
public Digest update(byte input)
```
Update the wrapped MessageDigest object with the given input data.
This method calls update(byte) method of the wrapped MessageDigest instance.

Parameters:

input - Input data.

Returns:

this object.

update
```
public Digest update(byte[] input)
```
Update the wrapped MessageDigest object with the given input data.
This method calls update(byte[]) method of the wrapped MessageDigest instance.

Parameters:

input - Input data.

Returns:

this object.

update
```
public Digest update(byte[] input,
                     int offset,
                     int length)
```
Update the wrapped MessageDigest object with the given input data.
This method calls update(byte[], int, int) method of the wrapped MessageDigest instance.

Parameters:

input - Input data.

offset - The offset to start from in the array.

length - The number of elements to use, starting at offset.

Returns:

this object.

update
```
public Digest update(ByteBuffer input)
```
Update the wrapped MessageDigest object with the given input data.
This method calls update(ByteBuffer) method of the wrapped MessageDigest instance.

Parameters:

input - Input data.

Returns:

this object.

update
```
public Digest update(Boolean input)
```
Update the wrapped MessageDigest object with the given input data.
This method is an alias of update(input.booleanValue()).

Parameters:

input - Input data.

Returns:

this object.

update
```
public Digest update(Boolean[] input)
```
Update the wrapped MessageDigest object with the given input data.
This method is an alias of update(input, 0, input.length).

Parameters:

input - Input data. If null is given, update is not performed.

Returns:

this object.

update
```
public Digest update(Boolean[] input,
                     int offset,
                     int length)
```
Update the wrapped MessageDigest object with the given input data.
This method calls update(Boolean) for each array element which is in the specified range.

Parameters:

input - Input data.

offset - The offset to start from in the array.

length - The number of elements to use, starting at offset.

Returns:

this object.

Throws:

IllegalArgumentException - The range specified by the parameters is invalid.

update
```
public Digest update(boolean input)
```
Update the wrapped MessageDigest object with the given input data.

Parameters:

input - Input data. true results in update((byte)1) and false results in update((byte)0).

Returns:

this object.

update
```
public Digest update(boolean[] input)
```
Update the wrapped MessageDigest object with the given input data.
This method is an alias of update(input, 0, input.length).

Parameters:

input - Input data. If null is given, update is not performed.

Returns:

this object.

update
```
public Digest update(boolean[] input,
                     int offset,
                     int length)
```
Update the wrapped MessageDigest object with the given input data.
This method calls update(boolean) for each array element which is in the specified range.

Parameters:

input - Input data.

offset - The offset to start from in the array.

length - The number of elements to use, starting at offset.

Returns:

this object.

Throws:

IllegalArgumentException - The range specified by the parameters is invalid.

update
```
public Digest update(Character input)
```
Update the wrapped MessageDigest object with the given input data.
This method is an alias of update(input.charValue()).

Parameters:

input - Input data.

Returns:

this object.

update
```
public Digest update(Character[] input)
```
Update the wrapped MessageDigest object with the given input data.
This method is an alias of update(input, 0, input.length).

Parameters:

input - Input data. If null is given, update is not performed.

Returns:

this object.

update
```
public Digest update(Character[] input,
                     int offset,
                     int length)
```
Update the wrapped MessageDigest object with the given input data.
This method calls update(Character) for each array element which is in the specified range.

Parameters:

input - Input data.

offset - The offset to start from in the array.

length - The number of elements to use, starting at offset.

Returns:

this object.

Throws:

IllegalArgumentException - The range specified by the parameters is invalid.

update
```
public Digest update(char input)
```
Update the wrapped MessageDigest object with the given input data.
This method calls update((byte)((input >> 8) & 0xff)) and update(((byte)(input >> 0) & 0xff).

Parameters:

input - Input data.

Returns:

this object.

update
```
public Digest update(char[] input)
```
Update the wrapped MessageDigest object with the given input data.
This method is an alias of update(input, 0, input.length).

Parameters:

input - Input data. If null is given, update is not performed.

Returns:

this object.

update
```
public Digest update(char[] input,
                     int offset,
                     int length)
```
Update the wrapped MessageDigest object with the given input data.
This method calls update(char) for each array element which is in the specified range.

Parameters:

input - Input data.

offset - The offset to start from in the array.

length - The number of elements to use, starting at offset.

Returns:

this object.

Throws:

IllegalArgumentException - The range specified by the parameters is invalid.

update
```
public Digest update(short input)
```
Update the wrapped MessageDigest object with the given input data.
This method calls update((byte)((input >> 8) & 0xff)) and update(((byte)(input >> 0) & 0xff).

Parameters:

input - Input data.

Returns:

this object.

update
```
public Digest update(short[] input)
```
Update the wrapped MessageDigest object with the given input data.
This method is an alias of update(input, 0, input.length).

Parameters:

input - Input data. If null is given, update is not performed.

Returns:

this object.

update
```
public Digest update(short[] input,
                     int offset,
                     int length)
```
Update the wrapped MessageDigest object with the given input data.
This method calls update(short) for each array element which is in the specified range.

Parameters:

input - Input data.

offset - The offset to start from in the array.

length - The number of elements to use, starting at offset.

Returns:

this object.

Throws:

IllegalArgumentException - The range specified by the parameters is invalid.

update
```
public Digest update(int input)
```
Update the wrapped MessageDigest object with the given input data.
This method calls update(byte) for each byte of the 4 bytes from MSB to LSB (from ((input >> 24) & 0xff) to ((input >> 0) & 0xff)).

Parameters:

input - Input data.

Returns:

this object.

update
```
public Digest update(int[] input)
```
Update the wrapped MessageDigest object with the given input data.
This method is an alias of update(input, 0, input.length).

Parameters:

input - Input data. If null is given, update is not performed.

Returns:

this object.

update
```
public Digest update(int[] input,
                     int offset,
                     int length)
```
Update the wrapped MessageDigest object with the given input data.
This method calls update(int) for each array element which is in the specified range.

Parameters:

input - Input data.

offset - The offset to start from in the array.

length - The number of elements to use, starting at offset.

Returns:

this object.

Throws:

IllegalArgumentException - The range specified by the parameters is invalid.

update
```
public Digest update(long input)
```
Update the wrapped MessageDigest object with the given input data.
This method calls update(byte) for each byte of the 8 bytes from MSB to LSB (from ((input >> 54) & 0xff) to ((input >> 0) & 0xff)).

Parameters:

input - Input data.

Returns:

this object.

update
```
public Digest update(long[] input)
```
Update the wrapped MessageDigest object with the given input data.
This method is an alias of update(input, 0, input.length).

Parameters:

input - Input data. If null is given, update is not performed.

Returns:

this object.

update
```
public Digest update(long[] input,
                     int offset,
                     int length)
```
Update the wrapped MessageDigest object with the given input data.
This method calls update(long) for each array element which is in the specified range.

Parameters:

input - Input data.

offset - The offset to start from in the array.

length - The number of elements to use, starting at offset.

Returns:

this object.

Throws:

IllegalArgumentException - The range specified by the parameters is invalid.

update
```
public Digest update(float input)
```
Update the wrapped MessageDigest object with the given input data.
This method converts the given float value to a int by Float.floatToRawIntBits(float) and then passes it to update(int).

Parameters:

input - Input data.

Returns:

this object.

update
```
public Digest update(float[] input)
```
Update the wrapped MessageDigest object with the given input data.
This method is an alias of update(input, 0, input.length).

Parameters:

input - Input data. If null is given, update is not performed.

Returns:

this object.

update
```
public Digest update(float[] input,
                     int offset,
                     int length)
```
Update the wrapped MessageDigest object with the given input data.
This method calls update(float) for each array element which is in the specified range.

Parameters:

input - Input data.

offset - The offset to start from in the array.

length - The number of elements to use, starting at offset.

Returns:

this object.

Throws:

IllegalArgumentException - The range specified by the parameters is invalid.

update
```
public Digest update(double input)
```
Update the wrapped MessageDigest object with the given input data.
This method converts the given double value to a long by Double.doubleToRawLongBits(double) and then passes it to update(long).

Parameters:

input - Input data.

Returns:

this object.

update
```
public Digest update(double[] input)
```
Update the wrapped MessageDigest object with the given input data.
This method is an alias of update(input, 0, input.length).

Parameters:

input - Input data. If null is given, update is not performed.

Returns:

this object.

update
```
public Digest update(double[] input,
                     int offset,
                     int length)
```
Update the wrapped MessageDigest object with the given input data.
This method calls update(double) for each array element which is in the specified range.

Parameters:

input - Input data.

offset - The offset to start from in the array.

length - The number of elements to use, starting at offset.

Returns:

this object.

Throws:

IllegalArgumentException - The range specified by the parameters is invalid.

update

public Digest update(Number number)

Update the wrapped MessageDigest object with the given input data.

This method checks the class of the given instance and calls a corresponding update method.


Class	Executed code
`Byte`	`update(((Byte)number).byteValue())`
`Short`	`update(((Short)number).shortValue())`
`Integer`	`update(((Integer)number).intValue())`
`Long`	`update(((Long)number).longValue())`
`Float`	`update(((Float)number).floatValue())`
`Double`	`update(((Double)number).doubleValue())`
`BigInteger`	`update(((BigInteger)number).toByteArray())`
`BigDecimal`	`update(((BigDecimal)number).toString())`
`AtomicInteger`	`update(((AtomicInteger)number).intValue())`
`AtomicLong`	`update(((AtomicLong)number).longValue())`
Others	Ignored.

Parameters:: number - Input data. If null or none of the above, update is not performed.
Returns:: this object.

update
```
public <TNumber extends Number> Digest update(TNumber[] input)
```
Update the wrapped MessageDigest object with the given input data.
This method is an alias of update(input, 0, input.length).

Type Parameters:

TNumber - The subclass of the Number class.

Parameters:

input - Input data. If null is given, update is not performed.

Returns:

this object.

update
```
public <TNumber extends Number> Digest update(TNumber[] input,
                                              int offset,
                                              int length)
```
Update the wrapped MessageDigest object with the given input data.
This method calls update(Number) for each array element which is in the specified range.

Type Parameters:

TNumber - The subclass of the Number class.

Parameters:

input - Input data.

offset - The offset to start from in the array.

length - The number of elements to use, starting at offset.

Returns:

this object.

Throws:

IllegalArgumentException - The range specified by the parameters is invalid.

update
```
public Digest update(String input)
```
Update the wrapped MessageDigest object with the given input data.
This method converts the given string into bytes with the character set of UTF-8 and then passes the byte array to update(byte[]).

Parameters:

input - Input data. If null is given, update is not performed.

Returns:

this object.

update
```
public Digest update(String[] input)
```
Update the wrapped MessageDigest object with the given input data.
This method is an alias of update(input, 0, input.length).

Parameters:

input - Input data. If null is given, update is not performed.

Returns:

this object.

update
```
public Digest update(String[] input,
                     int offset,
                     int length)
```
Update the wrapped MessageDigest object with the given input data.
This method calls update(String) for each array element which is in the specified range.

Parameters:

input - Input data.

offset - The offset to start from in the array.

length - The number of elements to use, starting at offset.

Returns:

this object.

Throws:

IllegalArgumentException - The range specified by the parameters is invalid.

update
```
public Digest update(Iterable<?> input)
```
Update the wrapped MessageDigest object with the given input data.
This method calls update(Object) for each element.

Parameters:

input - Input data. If null is given, update is not performed. null elements are ignored. Elements of unsupported classes are ignored, too.

Returns:

this object.

update
```
public Digest update(Object... input)
```
Update the wrapped MessageDigest object with the given input data.
This method calls update(Object) for each element.

Parameters:

input - Input data. If null is given, update is not performed. null elements are ignored. Elements of unsupported classes are ignored, too.

Returns:

this object.

update
```
public Digest update(Object input)
```
Update the wrapped MessageDigest object with the given input data.
This method checks the class of the given object and calls a corresponding update method.

Parameters:

input - Input data. If null is given, update is not performed.

Returns:

this object.

updateJson
```
public Digest updateJson(String json)
                  throws IOException
```
Update the wrapped MessageDigest object with the given JSON. This method updates the digest based on the content of the given JSON, and in the respect, this method is different from update(String).
JSONs with the same content, for example, two JSONs below, generate the same digest.
```
 { "key1":"value1", "key2":"value2" }
 { "key1" : "value1" , "key2" : "value2" }
 
```
If Digest.Feature.IGNORE_JSON_OBJECT_ENTRY_WITH_VALUE_NULL is enabled (it is disabled by default), key-value entries with value 'null' are treated as if they did not exist. Therefore, two JSONs below generate the same digest value.
```
 { "key1":"value1", "key2":null }
 { "key1":"value1" }
 
```
If Digest.Feature.SORT_JSON_OBJECT_ENTRY_KEYS is enabled (it is enabled by default), orders of JSON object keys do not matter. Therefore, two JSONs below generate the same digest value.
```
 { "key1":"value1", "key2":"value2" }
 { "key2":"value2", "key1":"value1" }
 
```
Parameters:

json - JSON.

Returns:

this object.

Throws:

IOException - Failed to parse the given JSON.

isEnabled
```
public boolean isEnabled(Digest.Feature feature)
```
Check if the specified feature is enabled.

Parameters:

feature - Feature to check.

Returns:

true if the feature is enabled. Otherwise, false.

setEnabled
```
public Digest setEnabled(Digest.Feature feature,
                         boolean enabled)
```
Enable or disable the specified feature.

Parameters:

feature - Digest.Feature to enable or disable.

enabled - true to enable the feature. false to disable the feature.

Returns:

this object.

bytesToHex
```
public static String bytesToHex(byte[] bytes)
```
Convert the given byte array to a hex string.

Parameters:

bytes - A byte array to convert.

Returns:

A hex string with 0-9 and a-f.

Class Digest

Nested Class Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

Digest

Digest

Digest

Digest

Method Detail

getInstance

getInstance

getInstance

getInstanceMD2

getInstanceMD5

getInstanceSHA1

getInstanceSHA256

getInstanceSHA384

getInstanceSHA512

getAlgorithm

getDigestLength

getProvider

getWrappedMessageDigest

clone

digest

digest

digest

digestAsString

digestAsString

digestAsString

digestAsString

reset

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

update

updateJson

isEnabled

setEnabled

bytesToHex