Package org.apache.hadoop.security.authentication.util

Class Signer

java.lang.Object

org.apache.hadoop.security.authentication.util.Signer

public class Signer
extends java.lang.Object

Signs strings and verifies signed strings using a SHA digest.

Constructor Summary

Constructors

Constructor	Description
Signer(SignerSecretProvider secretProvider)	Creates a Signer instance using the specified SignerSecretProvider.

Method Summary

Modifier and Type	Method	Description
protected void	checkSignatures(java.lang.String rawValue, java.lang.String originalSignature)
protected java.lang.String	computeSignature(byte[] secret, java.lang.String str)	Returns then signature of a string.
java.lang.String	sign(java.lang.String str)	Returns a signed string.
java.lang.String	verifyAndExtract(java.lang.String signedStr)	Verifies a signed string and extracts the original string.

Methods inherited from class java.lang.Object

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

Constructor Detail

Signer

public Signer(SignerSecretProvider secretProvider)

Creates a Signer instance using the specified SignerSecretProvider. The SignerSecretProvider should already be initialized.

Parameters:

secretProvider - The SignerSecretProvider to use

Method Detail

sign

public java.lang.String sign(java.lang.String str)

Returns a signed string.

Parameters:

str - string to sign.

Returns:

the signed string.

verifyAndExtract

public java.lang.String verifyAndExtract(java.lang.String signedStr)
                                  throws SignerException

Verifies a signed string and extracts the original string.

Parameters:

signedStr - the signed string to verify and extract.

Returns:

the extracted original string.

Throws:

SignerException - thrown if the given string is not a signed string or if the signature is invalid.

computeSignature

protected java.lang.String computeSignature(byte[] secret,
                                            java.lang.String str)

Returns then signature of a string.

Parameters:

secret - The secret to use

str - string to sign.

Returns:

the signature for the string.

checkSignatures

protected void checkSignatures(java.lang.String rawValue,
                               java.lang.String originalSignature)
                        throws SignerException

Throws:

SignerException