net.sf.mmm.crypto.asymmetric.sign

Class SignatureAlgorithm

java.lang.Object

net.sf.mmm.crypto.asymmetric.sign.SignatureAlgorithm

All Implemented Interfaces:

CryptoAlgorithm

public final class SignatureAlgorithm
extends Object
implements CryptoAlgorithm

Little helper to workaround quirks in JCE/JCA for signature algorithm names.

Since:

1.0.0

Field Summary

Fields

Modifier and Type	Field and Description
private String	algorithm
private static Map<String,String>	DIGEST2SIGNATURE_MAP
private String	hashAlgorithm
private static String	SEPARATOR
private static Map<String,String>	SIGNATURE2DIGEST_MAP
private String	signingAlgorithm

Constructor Summary

Constructors

Modifier	Constructor and Description
private	SignatureAlgorithm(String hashAlgorithm, String signingAlgorithm, String algorithm)

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj)
String	getAlgorithm()
String	getHashAlgorithm()
String	getSigningAlgorithm()
private static String	hash2sign(String hashingAlgorithm)
int	hashCode()
boolean	isNoHashing()
static SignatureAlgorithm	of(String algorithm)
static SignatureAlgorithm	of(String hashAlgorithm, String signingAlgorithm)
private static void	register(String digest)
private static void	register(String digest, String signaturePrefix)
private static String	require(String value, String name)
private static String	sign2hash(String signaturePrefix)
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

SEPARATOR

private static final String SEPARATOR

See Also:

Constant Field Values

DIGEST2SIGNATURE_MAP

private static final Map<String,String> DIGEST2SIGNATURE_MAP

SIGNATURE2DIGEST_MAP

private static final Map<String,String> SIGNATURE2DIGEST_MAP

hashAlgorithm

private final String hashAlgorithm

signingAlgorithm

private final String signingAlgorithm

algorithm

private final String algorithm

Constructor Detail

SignatureAlgorithm

private SignatureAlgorithm(String hashAlgorithm,
                           String signingAlgorithm,
                           String algorithm)

Method Detail

register

private static void register(String digest)

register

private static void register(String digest,
                             String signaturePrefix)

require

private static String require(String value,
                              String name)

getAlgorithm

public String getAlgorithm()

Specified by:

getAlgorithm in interface CryptoAlgorithm

Returns:

the name of the underlying algorithm (e.g. "RSA", "NONEwithECDSA", etc.).

See Also:

Key.getAlgorithm(), Signature.getAlgorithm(), MessageDigest.getAlgorithm(), SecureRandom.getAlgorithm(), Cipher.getAlgorithm()

getHashAlgorithm

public String getHashAlgorithm()

Returns:

the hash algorithm to perform of the message payload before signing.

isNoHashing

public boolean isNoHashing()

Returns:

true if hash algorithm is NONE.

getSigningAlgorithm

public String getSigningAlgorithm()

Returns:

the raw signing algorithm (e.g. RSA, DSA, or ECDSA).

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object

of

public static SignatureAlgorithm of(String hashAlgorithm,
                                    String signingAlgorithm)

Parameters:

hashAlgorithm - the getHashAlgorithm().

signingAlgorithm - the getSigningAlgorithm().

Returns:

the SignatureAlgorithm instance.

hash2sign

private static String hash2sign(String hashingAlgorithm)

of

public static SignatureAlgorithm of(String algorithm)

Parameters:

algorithm - the signature algorithm.

Returns:

the SignatureAlgorithm instance.

sign2hash

private static String sign2hash(String signaturePrefix)