Module seppiko.commons.utils

Package org.seppiko.commons.utils.crypto

Class SignatureUtil

java.lang.Object

org.seppiko.commons.utils.crypto.SignatureUtil

public class SignatureUtil
extends Object

Signature utility

Author:

Leonard Woo

See Also:

• Java Security Standard Algorithm Names

Method Summary

Modifier and Type	Method	Description
static byte[]	sign(String algorithm, PrivateKey privateKey, byte[] rawData)	Data Signature.
static byte[]	sign(String algorithm, Provider provider, PrivateKey privateKey, byte[] rawData)	Data Signature.
static Signature	signature(String algorithm, Provider provider)	Returns a Signature instance that implements the specified signature algorithm.
static boolean	verify(String algorithm, Provider provider, PublicKey publicKey, byte[] rawData, byte[] signedData)	Data Verification.
static boolean	verify(String algorithm, PublicKey publicKey, byte[] rawData, byte[] signedData)	Data Verification.

Methods inherited from class java.lang.Object

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

Method Details

signature

public static Signature signature(String algorithm,
 Provider provider)
                           throws NoSuchAlgorithmException,
NullPointerException

Returns a Signature instance that implements the specified signature algorithm.

Parameters:

algorithm - the standard name of the algorithm requested.

provider - the provider.

Returns:

the new Signature instance.

Throws:

NoSuchAlgorithmException - if no Provider supports a Signature implementation for the specified algorithm.

NullPointerException - if algorithm is null.

sign

public static byte[] sign(String algorithm,
 PrivateKey privateKey,
 byte[] rawData)
                   throws NoSuchAlgorithmException,
NullPointerException,
InvalidKeyException,
SignatureException

Data Signature.

Parameters:

algorithm - signature algorithm.

privateKey - signature private key.

rawData - data.

Returns:

signed data.

Throws:

NoSuchAlgorithmException - if no Provider supports a Signature implementation for the specified algorithm.

InvalidKeyException - if the key is invalid.

SignatureException - if this signature object is not initialized properly.

NullPointerException - if algorithm is null.

See Also:

• Signature

verify

public static boolean verify(String algorithm,
 PublicKey publicKey,
 byte[] rawData,
 byte[] signedData)
                      throws NoSuchAlgorithmException,
NullPointerException,
InvalidKeyException,
SignatureException

Data Verification.

Parameters:

algorithm - signature algorithm.

publicKey - signature private key.

rawData - data.

signedData - signed data.

Returns:

true is verified.

Throws:

NoSuchAlgorithmException - if no Provider supports a Signature implementation for the specified algorithm.

InvalidKeyException - if the key is invalid.

SignatureException - if this signature object is not initialized properly.

NullPointerException - if algorithm is null.

See Also:

• Signature

sign

public static byte[] sign(String algorithm,
 Provider provider,
 PrivateKey privateKey,
 byte[] rawData)
                   throws NoSuchAlgorithmException,
NullPointerException,
IllegalArgumentException,
InvalidKeyException,
SignatureException

Data Signature.

Parameters:

algorithm - signature algorithm.

provider - the provider.

privateKey - signature private key.

rawData - data.

Returns:

signed data.

Throws:

NoSuchAlgorithmException - if no Provider supports a Signature implementation for the specified algorithm.

InvalidKeyException - if the key is invalid.

SignatureException - if this signature object is not initialized properly.

NullPointerException - if algorithm is null.

IllegalArgumentException

See Also:

• Signature

verify

public static boolean verify(String algorithm,
 Provider provider,
 PublicKey publicKey,
 byte[] rawData,
 byte[] signedData)
                      throws NoSuchAlgorithmException,
NullPointerException,
IllegalArgumentException,
InvalidKeyException,
SignatureException

Data Verification.

Parameters:

algorithm - signature algorithm.

provider - the provider.

publicKey - signature private key.

rawData - data.

signedData - signed data.

Returns:

true is verified.

Throws:

NoSuchAlgorithmException - if no Provider supports a Signature implementation for the specified algorithm.

InvalidKeyException - if the key is invalid.

SignatureException - if this signature object is not initialized properly.

NullPointerException - if algorithm is null.

IllegalArgumentException

See Also:

• Signature