org.apache.sshd.common.digest

Class DigestUtils

java.lang.Object

org.apache.sshd.common.digest.DigestUtils

public final class DigestUtils
extends Object

Author:

Apache MINA SSHD Project

Method Summary

Modifier and Type	Method and Description
static boolean	checkSupported(String algorithm)
static <D extends Digest> D	findDigestByAlgorithm(String algo, Comparator<? super String> comp, Collection<? extends D> digests)
static <F extends DigestFactory> F	findFactoryByAlgorithm(String algo, Comparator<? super String> comp, Collection<? extends F> factories)
static String	getFingerPrint(Digest d, byte... buf)
static String	getFingerPrint(Digest d, byte[] buf, int offset, int len)
static String	getFingerPrint(Digest d, String s)
static String	getFingerPrint(Digest d, String s, Charset charset)
static String	getFingerPrint(Factory<? extends Digest> f, byte... buf)
static String	getFingerPrint(Factory<? extends Digest> f, byte[] buf, int offset, int len)
static String	getFingerPrint(Factory<? extends Digest> f, String s)
static String	getFingerPrint(Factory<? extends Digest> f, String s, Charset charset)
static byte[]	getRawFingerprint(Digest d, byte... buf)
static byte[]	getRawFingerprint(Digest d, byte[] buf, int offset, int len)

Methods inherited from class java.lang.Object

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

Method Detail

checkSupported

public static boolean checkSupported(String algorithm)

Parameters:

algorithm - The digest algorithm - never null/empty

Returns:

true if this digest algorithm is supported

See Also:

SecurityUtils.getMessageDigest(String)

findDigestByAlgorithm

public static <D extends Digest> D findDigestByAlgorithm(String algo,
                                                         Comparator<? super String> comp,
                                                         Collection<? extends D> digests)

Type Parameters:

D - The generic type of digest factory

Parameters:

algo - The required algorithm name - ignored if null/empty

comp - The Comparator to use to compare algorithm names

digests - The factories to check - ignored if null/empty

Returns:

The first DigestFactory whose algorithm matches the required one according to the comparator - null if no match found

findFactoryByAlgorithm

public static <F extends DigestFactory> F findFactoryByAlgorithm(String algo,
                                                                 Comparator<? super String> comp,
                                                                 Collection<? extends F> factories)

Type Parameters:

F - The generic type of digest factory

Parameters:

algo - The required algorithm name - ignored if null/empty

comp - The Comparator to use to compare algorithm names

factories - The factories to check - ignored if null/empty

Returns:

The first DigestFactory whose algorithm matches the required one according to the comparator - null if no match found

getFingerPrint

public static String getFingerPrint(Factory<? extends Digest> f,
                                    String s)
                             throws Exception

Parameters:

f - The Factory to create the Digest to use

s - The String to digest - ignored if null/empty, otherwise its UTF-8 representation is used as input for the fingerprint

Returns:

The fingerprint - null if null/empty input

Throws:

Exception - If failed to calculate the digest

See Also:

getFingerPrint(Digest, String, Charset)

getFingerPrint

public static String getFingerPrint(Factory<? extends Digest> f,
                                    String s,
                                    Charset charset)
                             throws Exception

Parameters:

f - The Factory to create the Digest to use

s - The String to digest - ignored if null/empty

charset - The Charset to use in order to convert the string to its byte representation to use as input for the fingerprint

Returns:

The fingerprint - null if null/empty input

Throws:

Exception - If failed to calculate the digest

getFingerPrint

public static String getFingerPrint(Digest d,
                                    String s)
                             throws Exception

Parameters:

d - The Digest to use

s - The String to digest - ignored if null/empty, otherwise its UTF-8 representation is used as input for the fingerprint

Returns:

The fingerprint - null if null/empty input

Throws:

Exception - If failed to calculate the digest

See Also:

getFingerPrint(Digest, String, Charset)

getFingerPrint

public static String getFingerPrint(Digest d,
                                    String s,
                                    Charset charset)
                             throws Exception

Parameters:

d - The Digest to use

s - The String to digest - ignored if null/empty

charset - The Charset to use in order to convert the string to its byte representation to use as input for the fingerprint

Returns:

The fingerprint - null if null/empty input

Throws:

Exception - If failed to calculate the digest

getFingerPrint

public static String getFingerPrint(Factory<? extends Digest> f,
                                    byte... buf)
                             throws Exception

Parameters:

f - The Factory to create the Digest to use

buf - The data buffer to be fingerprint-ed

Returns:

The fingerprint - null if empty data buffer

Throws:

Exception - If failed to calculate the fingerprint

See Also:

getFingerPrint(Factory, byte[], int, int)

getFingerPrint

public static String getFingerPrint(Factory<? extends Digest> f,
                                    byte[] buf,
                                    int offset,
                                    int len)
                             throws Exception

Parameters:

f - The Factory to create the Digest to use

buf - The data buffer to be fingerprint-ed

offset - The offset of the data in the buffer

len - The length of data - ignored if non-positive

Returns:

The fingerprint - null if non-positive length

Throws:

Exception - If failed to calculate the fingerprint

getFingerPrint

public static String getFingerPrint(Digest d,
                                    byte... buf)
                             throws Exception

Parameters:

d - The Digest to use

buf - The data buffer to be fingerprint-ed

Returns:

The fingerprint - null if empty data buffer

Throws:

Exception - If failed to calculate the fingerprint

See Also:

getFingerPrint(Digest, byte[], int, int)

getFingerPrint

public static String getFingerPrint(Digest d,
                                    byte[] buf,
                                    int offset,
                                    int len)
                             throws Exception

Parameters:

d - The Digest to use

buf - The data buffer to be fingerprint-ed

offset - The offset of the data in the buffer

len - The length of data - ignored if non-positive

Returns:

The fingerprint - null if non-positive length

Throws:

Exception - If failed to calculate the fingerprint

See Also:

getRawFingerprint(Digest, byte[], int, int)

getRawFingerprint

public static byte[] getRawFingerprint(Digest d,
                                       byte... buf)
                                throws Exception

Throws:

Exception

getRawFingerprint

public static byte[] getRawFingerprint(Digest d,
                                       byte[] buf,
                                       int offset,
                                       int len)
                                throws Exception

Throws:

Exception