Package com.itextpdf.text.pdf.security

Class PrivateKeySignature

java.lang.Object

com.itextpdf.text.pdf.security.PrivateKeySignature

All Implemented Interfaces:

ExternalSignature

public class PrivateKeySignature
extends Object
implements ExternalSignature

Implementation of the ExternalSignature interface that can be used when you have a PrivateKey object.

Author:

Paulo Soares

Constructor Summary

Constructors

Constructor	Description
PrivateKeySignature(PrivateKey pk, String hashAlgorithm, String provider)	Creates an ExternalSignature instance

Method Summary

Modifier and Type	Method	Description
String	getEncryptionAlgorithm()	Returns the encryption algorithm used for signing.
String	getHashAlgorithm()	Returns the hash algorithm.
byte[]	sign(byte[] b)	Signs it using the encryption algorithm in combination with the digest algorithm.

Methods inherited from class java.lang.Object

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

Constructor Detail

PrivateKeySignature

public PrivateKeySignature(PrivateKey pk,
                           String hashAlgorithm,
                           String provider)

Creates an ExternalSignature instance

Parameters:

pk - a PrivateKey object

hashAlgorithm - the hash algorithm (e.g. "SHA-1", "SHA-256",...)

provider - the security provider (e.g. "BC")

Method Detail

getHashAlgorithm

public String getHashAlgorithm()

Returns the hash algorithm.

Specified by:

getHashAlgorithm in interface ExternalSignature

Returns:

the hash algorithm (e.g. "SHA-1", "SHA-256,...")

See Also:

ExternalSignature.getHashAlgorithm()

getEncryptionAlgorithm

public String getEncryptionAlgorithm()

Returns the encryption algorithm used for signing.

Specified by:

getEncryptionAlgorithm in interface ExternalSignature

Returns:

the encryption algorithm ("RSA" or "DSA")

See Also:

ExternalSignature.getEncryptionAlgorithm()

sign

public byte[] sign(byte[] b)
            throws GeneralSecurityException

Signs it using the encryption algorithm in combination with the digest algorithm.

Specified by:

sign in interface ExternalSignature

Parameters:

message - the message you want to be hashed and signed

Returns:

a signed message digest

Throws:

GeneralSecurityException