KeyCertificate (I2P Anonymous Network - Java Documentation

java.lang.Object
- net.i2p.data.DataStructureImpl
- - net.i2p.data.Certificate
  - - net.i2p.data.KeyCertificate

All Implemented Interfaces:

Serializable, DataStructure
```
public class KeyCertificate
extends Certificate
```
This certificate type gets its own class because it's going to be used a lot. Format is: 2 byte sig type, 2 byte crypto type, excess sig data, excess crypto data. The crypto type is assumed to be always 0x0000 (ElG) for now.

Since:

0.9.12

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field	Description
`(package private) static byte[]`	`ECDSA256_PAYLOAD`
`(package private) static byte[]`	`Ed25519_PAYLOAD`
`static KeyCertificate`	`ELG_ECDSA256_CERT`	An immutable ElG/ECDSA-P256 certificate.
`static KeyCertificate`	`ELG_Ed25519_CERT`	An immutable ElG/Ed25519 certificate.
`static int`	`HEADER_LENGTH`

Fields inherited from class net.i2p.data.Certificate
_payload, _type, CERTIFICATE_LENGTH_SIGNED_WITH_HASH, CERTIFICATE_TYPE_HASHCASH, CERTIFICATE_TYPE_HIDDEN, CERTIFICATE_TYPE_KEY, CERTIFICATE_TYPE_MULTIPLE, CERTIFICATE_TYPE_NULL, CERTIFICATE_TYPE_SIGNED, NULL_CERT

Constructor Summary

Constructors
Constructor	Description
`KeyCertificate(byte[] payload)`
`KeyCertificate(SigType type)`	A KeyCertificate with crypto type 0 (ElGamal) and the signature type as specified.
`KeyCertificate(Certificate cert)`	Up-convert a cert to this class
`KeyCertificate(SigningPublicKey spk)`	A KeyCertificate with crypto type 0 (ElGamal) and the signature type and extra data from the given public key.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`getCryptoTypeCode()`
`byte[]`	`getExtraKeyData()`	Signing Key extra data, if any, is first in the array.
`byte[]`	`getExtraSigningKeyData()`	Signing Key extra data, if any.
`SigType`	`getSigType()`
`int`	`getSigTypeCode()`
`KeyCertificate`	`toKeyCertificate()`	Up-convert this to a KeyCertificate
`String`	`toString()`

Methods inherited from class net.i2p.data.Certificate
create, create, equals, getCertificateType, getPayload, hashCode, readBytes, readBytes, setCertificateType, setPayload, size, writeBytes, writeBytes

Methods inherited from class net.i2p.data.DataStructureImpl
calculateHash, fromBase64, fromByteArray, read, toBase64, toByteArray

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - HEADER_LENGTH
```
public static final int HEADER_LENGTH
```
    See Also:
    
    Constant Field Values
  - Ed25519_PAYLOAD
```
static final byte[] Ed25519_PAYLOAD
```
    Since:
    
    0.9.22 pkg private for Certificate.create()
  - ECDSA256_PAYLOAD
```
static final byte[] ECDSA256_PAYLOAD
```
    Since:
    
    0.9.22 pkg private for Certificate.create()
  - ELG_ECDSA256_CERT
```
public static final KeyCertificate ELG_ECDSA256_CERT
```
    An immutable ElG/ECDSA-P256 certificate.
  - ELG_Ed25519_CERT
```
public static final KeyCertificate ELG_Ed25519_CERT
```
    An immutable ElG/Ed25519 certificate.
    
    Since:
    
    0.9.22
- Constructor Detail
  - KeyCertificate
```
public KeyCertificate(byte[] payload)
               throws DataFormatException
```
    Parameters:
    
    payload - 4 bytes minimum if non-null
    
    Throws:
    
    DataFormatException
  - KeyCertificate
```
public KeyCertificate(SigningPublicKey spk)
```
    A KeyCertificate with crypto type 0 (ElGamal) and the signature type and extra data from the given public key.
    
    Parameters:
    
    spk - non-null data non-null
    
    Throws:
    
    IllegalArgumentException
  - KeyCertificate
```
public KeyCertificate(SigType type)
```
    A KeyCertificate with crypto type 0 (ElGamal) and the signature type as specified. Payload is created. If type.getPubkeyLen() is greater than 128, caller MUST fill in the extra key data in the payload.
    
    Parameters:
    
    type - non-null
    
    Throws:
    
    IllegalArgumentException
  - KeyCertificate
```
public KeyCertificate(Certificate cert)
               throws DataFormatException
```
    Up-convert a cert to this class
    
    Parameters:
    
    cert - payload 4 bytes minimum if non-null
    
    Throws:
    
    DataFormatException - if cert type != CERTIFICATE_TYPE_KEY
- Method Detail
  - getSigTypeCode
```
public int getSigTypeCode()
```
    Returns:
    
    -1 if unset
  - getCryptoTypeCode
```
public int getCryptoTypeCode()
```
    Returns:
    
    -1 if unset
  - getSigType
```
public SigType getSigType()
```
    Returns:
    
    null if unset or unknown
  - getExtraKeyData
```
public byte[] getExtraKeyData()
```
    Signing Key extra data, if any, is first in the array. Crypto Key extra data, if any, is second in the array, at offset max(0, getSigType().getPubkeyLen() - 128)
    
    Returns:
    
    null if unset or none
  - getExtraSigningKeyData
```
public byte[] getExtraSigningKeyData()
```
    Signing Key extra data, if any.
    
    Returns:
    
    null if unset or none
    
    Throws:
    
    UnsupportedOperationException - if the sig type is unsupported
  - toKeyCertificate
```
public KeyCertificate toKeyCertificate()
```
    Description copied from class: Certificate
    
    Up-convert this to a KeyCertificate
    
    Overrides:
    
    toKeyCertificate in class Certificate
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Certificate

Class KeyCertificate

Field Summary

Fields inherited from class net.i2p.data.Certificate

Constructor Summary

Method Summary

Methods inherited from class net.i2p.data.Certificate

Methods inherited from class net.i2p.data.DataStructureImpl

Methods inherited from class java.lang.Object

Field Detail

HEADER_LENGTH

Ed25519_PAYLOAD

ECDSA256_PAYLOAD

ELG_ECDSA256_CERT

ELG_Ed25519_CERT

Constructor Detail

KeyCertificate

KeyCertificate

KeyCertificate

KeyCertificate

Method Detail

getSigTypeCode

getCryptoTypeCode

getSigType

getExtraKeyData

getExtraSigningKeyData

toKeyCertificate

toString