org.apache.sshd.common.signature

Class SignatureDSA

java.lang.Object

org.apache.sshd.common.signature.AbstractSignature

org.apache.sshd.common.signature.SignatureDSA

All Implemented Interfaces:

Signature

public class SignatureDSA
extends AbstractSignature

DSA Signature

Author:

Apache MINA SSHD Project

See Also:

RFC4253 section 6.6

Field Summary

Fields

Modifier and Type	Field and Description
static int	DSA_SIGNATURE_LENGTH
static int	MAX_SIGNATURE_VALUE_LENGTH

Fields inherited from class org.apache.sshd.common.signature.AbstractSignature

signature

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	SignatureDSA(String algorithm)

Method Summary

Modifier and Type	Method and Description
static void	putBigInteger(BigInteger value, byte[] result, int offset)
byte[]	sign() Compute the signature
boolean	verify(byte[] sig) Verify against the given signature

Methods inherited from class org.apache.sshd.common.signature.AbstractSignature

extractEncodedSignature, getAlgorithm, initSigner, initVerifier, toString, update, update

Methods inherited from class java.lang.Object

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

Field Detail

DSA_SIGNATURE_LENGTH

public static final int DSA_SIGNATURE_LENGTH

See Also:

Constant Field Values

MAX_SIGNATURE_VALUE_LENGTH

public static final int MAX_SIGNATURE_VALUE_LENGTH

See Also:

Constant Field Values

Constructor Detail

SignatureDSA

protected SignatureDSA(String algorithm)

Method Detail

sign

public byte[] sign()
            throws Exception

Description copied from interface: Signature

Compute the signature

Returns:

The signature value

Throws:

Exception - If failed to calculate the signature

putBigInteger

public static void putBigInteger(BigInteger value,
                                 byte[] result,
                                 int offset)

verify

public boolean verify(byte[] sig)
               throws Exception

Description copied from interface: Signature

Verify against the given signature

Parameters:

sig - The signed data

Returns:

true if signature is valid

Throws:

Exception - If failed to extract signed data for validation