javacard.security
Interface ECPublicKey

All Superinterfaces:

ECKey, Key, PublicKey

public interface ECPublicKey

extends PublicKey, ECKey

The ECPublicKey interface is used to verify signatures on signed data using the ECDSA algorithm and to generate shared secrets using the ECDH algorithm. An implementation of ECPublicKey interface must also implement the ECKey interface methods.

When all components of the key (W, A, B, G, R, Field) are set, the key is initialized and ready for use.

The notation used to describe parameters specific to the EC algorithm is based on the naming conventions established in [IEEE P1363].

Version:

1.0

See Also:

ECPrivateKey

Method Summary

short	getW(byte[] buffer, short offset) Returns the point of the curve comprising the public key in plain text form.
void	setW(byte[] buffer, short offset, short length) Sets the point of the curve comprising the public key.

Methods inherited from interface javacard.security.Key

clearKey, getSize, getType, isInitialized

Methods inherited from interface javacard.security.ECKey

getA, getB, getField, getG, getK, getR, setA, setB, setFieldF2M, setFieldF2M, setFieldFP, setG, setK, setR

Method Detail

setW

public void setW(byte[] buffer,
                 short offset,
                 short length)
          throws CryptoException

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.

Throws:

CryptoException

getW

public short getW(byte[] buffer,
                  short offset)
           throws CryptoException

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).

Throws:

CryptoException