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 java.lang.Object
implements ExternalSignature

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

Field Summary

Fields

Modifier and Type	Field	Description
private java.lang.String	encryptionAlgorithm	The encryption algorithm (obtained from the private key)
private java.lang.String	hashAlgorithm	The hash algorithm.
private java.security.PrivateKey	pk	The private key object.
private java.lang.String	provider	The security provider

Constructor Summary

Constructors

Constructor	Description
PrivateKeySignature(java.security.PrivateKey pk, java.lang.String hashAlgorithm, java.lang.String provider)	Creates an ExternalSignature instance

Method Summary

Modifier and Type	Method	Description
java.lang.String	getEncryptionAlgorithm()	Returns the encryption algorithm used for signing.
java.lang.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

Field Detail

pk

private java.security.PrivateKey pk

The private key object.

hashAlgorithm

private java.lang.String hashAlgorithm

The hash algorithm.

encryptionAlgorithm

private java.lang.String encryptionAlgorithm

The encryption algorithm (obtained from the private key)

provider

private java.lang.String provider

The security provider

Constructor Detail

PrivateKeySignature

public PrivateKeySignature(java.security.PrivateKey pk,
                           java.lang.String hashAlgorithm,
                           java.lang.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 java.lang.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 java.lang.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 java.security.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:

java.security.GeneralSecurityException