net.markenwerk.utils.mail.dkim

Class DkimSigner

java.lang.Object

net.markenwerk.utils.mail.dkim.DkimSigner

public class DkimSigner
extends Object

Main class providing a signature according to DKIM RFC 4871.

Since:

1.0.0

Author:

Torsten Krause (tk at markenwerk dot net), Florian Sager

Constructor Summary

Constructors

Constructor and Description
DkimSigner(String signingDomain, String selector, File derFile) Created a new DkimSigner for the given signing domain and selector with the given DER encoded RSA private Key.
DkimSigner(String signingDomain, String selector, InputStream derStream) Created a new DkimSigner for the given signing domain and selector with the given DER encoded RSA private Key.
DkimSigner(String signingDomain, String selector, RSAPrivateKey privateKey) Created a new DkimSigner for the given signing domain and selector with the given RSAPrivateKey.

Method Summary

Modifier and Type	Method and Description
void	addHeaderToSign(String header) Adds a header to the set of headers that will be included in the signature, if present.
Canonicalization	getBodyCanonicalization() Returns the configured Canonicalization to be used for the body.
Canonicalization	getHeaderCanonicalization() Returns the configured Canonicalization to be used for the headers.
String	getIdentity() Returns the configured identity parameter.
boolean	getLengthParam() Returns the configured length parameter.
SigningAlgorithm	getSigningAlgorithm() Returns the configured SigningAlgorithm.
boolean	isCheckDomainKey() Returns whether the domain key should be retrieved and checked.
boolean	isZParam() Returns the configured z parameter.
void	removeHeaderToSign(String header) Removes a header from the set of headers that will be included in the signature, unless it is one of the required headers ('From', 'To', 'Subject').
void	setBodyCanonicalization(Canonicalization canonicalization) Sets the Canonicalization to be used for the body.
void	setCheckDomainKey(boolean checkDomainKey) Sets, whether the domain key should be retrieved and checked.
void	setHeaderCanonicalization(Canonicalization canonicalization) Sets the Canonicalization to be used for the headers.
void	setIdentity(String identity) Sets the identity parameter to be used.
void	setLengthParam(boolean lengthParam) Sets the length parameter to be used.
void	setSigningAlgorithm(SigningAlgorithm signingAlgorithm) Sets the SigningAlgorithm to be used.
void	setZParam(boolean zParam) Sets the z parameter to be used.
protected String	sign(DkimMessage message) Returns the DKIM signature header line.

Methods inherited from class java.lang.Object

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

Constructor Detail

DkimSigner

public DkimSigner(String signingDomain,
                  String selector,
                  RSAPrivateKey privateKey)
           throws DkimException

Created a new DkimSigner for the given signing domain and selector with the given RSAPrivateKey.

Parameters:

signingDomain - The signing domain to be used.

selector - The selector to be used.

privateKey - The RSAPrivateKey to be used to sign DkimMessages.

Throws:

DkimException - If the given signing domain is invalid.

DkimSigner

public DkimSigner(String signingDomain,
                  String selector,
                  File derFile)
           throws IOException,
                  NoSuchAlgorithmException,
                  InvalidKeySpecException,
                  DkimException

Created a new DkimSigner for the given signing domain and selector with the given DER encoded RSA private Key.

Parameters:

signingDomain - The signing domain to be used.

selector - The selector to be used.

derFile - A File that contains the DER encoded RSA private key to be used.

Throws:

IOException - If reading the content of the given File failed.

NoSuchAlgorithmException - If the RSA algorithm is not supported by the current JVM.

InvalidKeySpecException - If the content of the given File couldn't be interpreted as an RSA private key.

DkimException - If the given signing domain is invalid.

DkimSigner

public DkimSigner(String signingDomain,
                  String selector,
                  InputStream derStream)
           throws IOException,
                  NoSuchAlgorithmException,
                  InvalidKeySpecException

Created a new DkimSigner for the given signing domain and selector with the given DER encoded RSA private Key.

Parameters:

signingDomain - The signing domain to be used.

selector - The selector to be used.

derStream - A InputStream that yields the DER encoded RSA private key to be used. The InputStream will be closed after it has been read.

Throws:

IOException - If reading the content of the given InputStream failed.

NoSuchAlgorithmException - If the RSA algorithm is not supported by the current JVM.

InvalidKeySpecException - If the content of the given InputStream couldn't be interpreted as an RSA private key.

DkimException - If the given signing domain is invalid.

Method Detail

getIdentity

public String getIdentity()

Returns the configured identity parameter.

Returns:

The configured identity parameter.

setIdentity

public void setIdentity(String identity)
                 throws DkimException

Sets the identity parameter to be used.

Parameters:

identity - The identity to be used.

Throws:

DkimException - If the given identity parameter doesn't belong to the signing domain of this DkimSigner or an subdomain thereof.

getBodyCanonicalization

public Canonicalization getBodyCanonicalization()

Returns the configured Canonicalization to be used for the body.

Returns:

The configured Canonicalization to be used for the body.

setBodyCanonicalization

public void setBodyCanonicalization(Canonicalization canonicalization)

Sets the Canonicalization to be used for the body.

Parameters:

canonicalization - The Canonicalization to be used for the body.

getHeaderCanonicalization

public Canonicalization getHeaderCanonicalization()

Returns the configured Canonicalization to be used for the headers.

Returns:

The configured Canonicalization to be used for the headers.

setHeaderCanonicalization

public void setHeaderCanonicalization(Canonicalization canonicalization)

Sets the Canonicalization to be used for the headers.

Parameters:

canonicalization - The Canonicalization to be used for the headers.

addHeaderToSign

public void addHeaderToSign(String header)

Adds a header to the set of headers that will be included in the signature, if present.

Parameters:

header - The name of the header.

removeHeaderToSign

public void removeHeaderToSign(String header)

Removes a header from the set of headers that will be included in the signature, unless it is one of the required headers ('From', 'To', 'Subject').

Parameters:

header - The name of the header.

getLengthParam

public boolean getLengthParam()

Returns the configured length parameter.

Returns:

The configured length parameter.

setLengthParam

public void setLengthParam(boolean lengthParam)

Sets the length parameter to be used.

Parameters:

lengthParam - The length parameter to be used.

isZParam

public boolean isZParam()

Returns the configured z parameter.

Returns:

The configured z parameter.

setZParam

public void setZParam(boolean zParam)

Sets the z parameter to be used.

Parameters:

zParam - The z parameter to be used.

getSigningAlgorithm

public SigningAlgorithm getSigningAlgorithm()

Returns the configured SigningAlgorithm.

Returns:

The configured SigningAlgorithm.

setSigningAlgorithm

public void setSigningAlgorithm(SigningAlgorithm signingAlgorithm)
                         throws DkimException

Sets the SigningAlgorithm to be used.

Parameters:

signingAlgorithm - The SigningAlgorithm to be used.

Throws:

DkimException - If either the signing algorithm or the hashing algorithm is not supported by the current JVM or the Signature couldn't be initialized.

isCheckDomainKey

public boolean isCheckDomainKey()

Returns whether the domain key should be retrieved and checked.

Returns:

Whether the domain key should be retrieved and checked.

See Also:

DomainKey.check(String, RSAPrivateKey)

setCheckDomainKey

public void setCheckDomainKey(boolean checkDomainKey)

Sets, whether the domain key should be retrieved and checked.

Parameters:

checkDomainKey - Whether the domain key should be retrieved and checked.

sign

protected String sign(DkimMessage message)
               throws DkimSigningException

Returns the DKIM signature header line.

Parameters:

message - The DkimMessage to sign.

Returns:

The DKIM signature header line

Throws:

DkimSigningException - If the given DkimMessage couldnt't be signed.