io.fusionauth.jwt.ec

Class ECDSASignature

java.lang.Object

io.fusionauth.jwt.ec.ECDSASignature

public class ECDSASignature
extends Object

Handle encoding and decoding an ECDSA signature.

The DER encoded ECDSA signature structure is as follows:

                                                                          s byte array
                                                                                   |
                                                        Length of s byte array     |
                                                                             |     |
                                                          Integer Tag        |     |
                        Sequence Tag                                |        |     |
                                  |                                 |        |     |
 DER Encoded ECDSA Signature:  | 0x30 | lenZ | 0x02 | len(r) | r | 0x02 | len(s) | s
                                          |      |       |     |
         Length of the remaining byte array      |       |     |
                                                 |       |     |
                                        Integer Tag      |     |
                                                         |     |
                                     Length of r byte array    |
                                                               |
 

Author:

Daniel DeGroff

Constructor Summary

Constructors

Constructor and Description
ECDSASignature(byte[] bytes)

Method Summary

Modifier and Type	Method and Description
byte[]	derDecode(Algorithm algorithm) Accept a DER encoded signature and extract the 'r' and the 's' components of the Elliptic signature.
byte[]	derEncode() Accept an ECDSA encoded signature of the 'r' and 's' elliptic components, return these values DER encoded.

Methods inherited from class java.lang.Object

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

Constructor Detail

ECDSASignature

public ECDSASignature(byte[] bytes)

Method Detail

derDecode

public byte[] derDecode(Algorithm algorithm)
                 throws IOException

Accept a DER encoded signature and extract the 'r' and the 's' components of the Elliptic signature.

Parameters:

algorithm - the signature algorithm used

Returns:

a byte array containing the 'r' and the 's' elliptic signature components.

Throws:

IOException - when $%@! gets real.

derEncode

public byte[] derEncode()
                 throws IOException

Accept an ECDSA encoded signature of the 'r' and 's' elliptic components, return these values DER encoded.

Returns:

a DER encoded sequence containing the 'r' and the 's' elliptic signature components

Throws:

IOException - when $%@! gets real.