COSE

Class Sign1Message

java.lang.Object

COSE.Attribute

COSE.Message

COSE.SignCommon

COSE.Sign1Message

public class Sign1Message
extends SignCommon

The Sign1Message class implements the COSE_Sign1 object. This provides for a single signature where the signer is normally implicitly known. SignMessage need to be used in those cases where more than one signature is needed on a content. There is no way to convert a signed message between the two formats.

Create a Sign1Message object for a new message, when processing an existing message use Message.DecodeFromBytes to create the Sign1Message object.

There are examples of using this class:
Simple Example

Author:

jimsch

Field Summary

Fields inherited from class COSE.SignCommon

contextString

Fields inherited from class COSE.Message

emitContent, emitTag, messageTag, rgbContent

Fields inherited from class COSE.Attribute

DO_NOT_SEND, DontSendAttributes, externalData, objDontSend, objProtected, objUnprotected, PROTECTED, ProtectedAttributes, rgbProtected, UNPROTECTED, UnprotectedAttributes

Constructor Summary

Constructors

Constructor and Description
Sign1Message() Create a signed message object for which there will be a leading tag and the content will be included.
Sign1Message(boolean emitTag) Create a signed message object.
Sign1Message(boolean emitTag, boolean emitContent) Create a signed message object for which the emission of the leading tag and content is controlled by the parameters.

Method Summary

Modifier and Type	Method and Description
protected void	DecodeFromCBORObject(com.upokecenter.cbor.CBORObject messageObject) Internal function used in creating a Sign1Message object from a byte string.
protected com.upokecenter.cbor.CBORObject	EncodeCBORObject() Internal function used to create a serialization of a COSE_Sign1 message
void	sign(OneKey key) Create a signature for the message if one does not exist.
boolean	validate(OneKey cnKey) Validate the signature on the message using the passed in key.

Methods inherited from class COSE.Message

DecodeFromBytes, DecodeFromBytes, EncodeToBytes, EncodeToCBORObject, GetContent, HasContent, SetContent, SetContent

Methods inherited from class COSE.Attribute

addAttribute, addAttribute, addAttribute, AddProtected, AddProtected, AddProtected, AddUnprotected, AddUnprotected, AddUnprotected, findAttribute, findAttribute, findAttribute, findAttribute, getDoNotSendAttributes, getExternal, getProtectedAttributes, getUnprotectedAttributes, removeAttribute, removeAttribute, setExternal

Methods inherited from class java.lang.Object

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

Constructor Detail

Sign1Message

public Sign1Message()

Create a signed message object for which there will be a leading tag and the content will be included.

Sign1Message

public Sign1Message(boolean emitTag)

Create a signed message object. Emission of the leading tag is controlled by the parameter.

Parameters:

emitTag - emit leading tag when message is serialized

Sign1Message

public Sign1Message(boolean emitTag,
                    boolean emitContent)

Create a signed message object for which the emission of the leading tag and content is controlled by the parameters.

Parameters:

emitTag - emit leading tag when message is serialized

emitContent - emit the content as part of the message

Since:

COSE 0.9.1

Method Detail

sign

public void sign(OneKey key)
          throws CoseException

Create a signature for the message if one does not exist.

Parameters:

key - key to use to sign the message

Throws:

CoseException - Errors generated by the COSE module

validate

public boolean validate(OneKey cnKey)
                 throws CoseException

Validate the signature on the message using the passed in key.

Parameters:

cnKey - key to use for validation

Returns:

true if the signature validates

Throws:

CoseException - Errors generated by the COSE module

DecodeFromCBORObject

protected void DecodeFromCBORObject(com.upokecenter.cbor.CBORObject messageObject)
                             throws CoseException

Internal function used in creating a Sign1Message object from a byte string.

Specified by:

DecodeFromCBORObject in class Message

Parameters:

messageObject - COSE_Sign1 encoded object.

Throws:

CoseException - Errors generated by the COSE module

EncodeCBORObject

protected com.upokecenter.cbor.CBORObject EncodeCBORObject()
                                                    throws CoseException

Internal function used to create a serialization of a COSE_Sign1 message

Specified by:

EncodeCBORObject in class Message

Returns:

CBOR object which can be encoded.

Throws:

CoseException - Errors generated by the COSE module