ECPublicKeyImpl

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com.licel.jcardsim.crypto
Class ECPublicKeyImpl

java.lang.Object
  extended by com.licel.jcardsim.crypto.KeyImpl
      extended by com.licel.jcardsim.crypto.ECKeyImpl
          extended by com.licel.jcardsim.crypto.ECPublicKeyImpl
All Implemented Interfaces:
KeyWithParameters, ECKey, ECPublicKey, Key, PublicKey
public class ECPublicKeyImpl
extends ECKeyImpl
implements ECPublicKey

Implementation ECPublicKey based on BouncyCastle CryptoAPI

See Also:
ECPublicKey, ECPublicKeyParameters

Field Summary
protected  ByteContainer w
           
 
Fields inherited from class com.licel.jcardsim.crypto.ECKeyImpl
a, b, e1, e2, e3, fp, g, isKInitialized, k, r
 
Fields inherited from class com.licel.jcardsim.crypto.KeyImpl
size, type
 
Constructor Summary
ECPublicKeyImpl(byte keyType, short keySize)
          Construct not-initialized ecc public key
ECPublicKeyImpl(org.bouncycastle.crypto.params.ECPublicKeyParameters params)
          Construct and initialize ecc key with ECPublicKeyParameters.
 
Method Summary
 void clearKey()
          Clears the key and sets its initialized state to false.
 org.bouncycastle.crypto.CipherParameters getParameters()
          Get ECPublicKeyParameters
 short getW(byte[] buffer, short offset)
          Returns the point of the curve comprising the public key in plain text form.
 boolean isInitialized()
          Reports the initialized state of the key.
 void setW(byte[] buffer, short offset, short length)
          Sets the point of the curve comprising the public key.
 
Methods inherited from class com.licel.jcardsim.crypto.ECKeyImpl
getA, getB, getDomainParameters, getField, getG, getK, getKeyGenerationParameters, getR, setA, setB, setFieldF2M, setFieldF2M, setFieldFP, setG, setK, setR
 
Methods inherited from class com.licel.jcardsim.crypto.KeyImpl
getSize, getType
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface javacard.security.Key
getSize, getType
 
Methods inherited from interface javacard.security.ECKey
getA, getB, getField, getG, getK, getR, setA, setB, setFieldF2M, setFieldF2M, setFieldFP, setG, setK, setR
 

Field Detail

w

protected ByteContainer w
Constructor Detail

ECPublicKeyImpl

public ECPublicKeyImpl(byte keyType,
                       short keySize)
Construct not-initialized ecc public key

Parameters:
size - key size it bits
See Also:
KeyBuilder

ECPublicKeyImpl

public ECPublicKeyImpl(org.bouncycastle.crypto.params.ECPublicKeyParameters params)
Construct and initialize ecc key with ECPublicKeyParameters. Use in KeyPairImpl

Parameters:
params - key params from BouncyCastle API
See Also:
KeyPair, ECPublicKeyParameters
Method Detail

setW

public void setW(byte[] buffer,
                 short offset,
                 short length)
          throws CryptoException
Description copied from interface: ECPublicKey
Sets the point of the curve comprising the public key. The point should be specified as an octet string as per ANSI X9.62. A specific implementation need not support the compressed form, but must support the uncompressed form of the point. The plain text data format is big-endian and right-aligned (the least significant bit is the least significant bit of last byte). Input parameter data is copied into the internal representation.

Note:

  • If the key object implements the javacardx.crypto.KeyEncryption interface and the Cipher object specified via setKeyCipher() is not null, the key value is decrypted using the Cipher object.

Specified by:
setW in interface ECPublicKey
Parameters:
buffer - the input buffer
offset - the offset into the input buffer at which the point specification begins
length - the byte length of the point specification
Throws:
CryptoException - with the following reason code:
  • CryptoException.ILLEGAL_VALUE if the input parameter data format is incorrect, or if the input parameter data is inconsistent with the key length, or if input data decryption is required and fails.

getW

public short getW(byte[] buffer,
                  short offset)
           throws CryptoException
Description copied from interface: ECPublicKey
Returns the point of the curve comprising the public key in plain text form. The point is represented as an octet string in compressed or uncompressed forms as per ANSI X9.62. The data format is big-endian and right-aligned (the least significant bit is the least significant bit of last byte).

Specified by:
getW in interface ECPublicKey
Parameters:
buffer - the output buffer
offset - the offset into the output buffer at which the point specification data is to begin
Returns:
the byte length of the point specificiation
Throws:
CryptoException - with the following reason code:
  • CryptoException.UNINITIALIZED_KEY if the point of the curve comprising the public key has not been successfully initialized since the time the initialized state of the key was set to false.
See Also:
Key

isInitialized

public boolean isInitialized()
Description copied from interface: Key
Reports the initialized state of the key. Keys must be initialized before being used.

A Key object sets its initialized state to true only when all the associated Key object parameters have been set at least once since the time the initialized state was set to false.

A newly created Key object sets its initialized state to false. Invocation of the clearKey() method sets the initialized state to false. A key with transient key data sets its initialized state to false on the associated clear events.

Specified by:
isInitialized in interface Key
Overrides:
isInitialized in class ECKeyImpl
Returns:
true if the key has been initialized

clearKey

public void clearKey()
Description copied from interface: Key
Clears the key and sets its initialized state to false.

Specified by:
clearKey in interface Key
Overrides:
clearKey in class ECKeyImpl

getParameters

public org.bouncycastle.crypto.CipherParameters getParameters()
Get ECPublicKeyParameters

Specified by:
getParameters in interface KeyWithParameters
Returns:
parameters for use with BouncyCastle API
See Also:
ECPublicKeyParameters
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