javacard.security
Interface RSAPrivateKey

All Superinterfaces:

Key, PrivateKey

public interface RSAPrivateKey

extends PrivateKey

The RSAPrivateKey class is used to sign data using the RSA algorithm in its modulus/exponent form. It may also be used by the javacardx.crypto.Cipher class to encrypt/decrypt messages.

When both the modulus and exponent of the key are set, the key is initialized and ready for use.

See Also:

RSAPublicKey

Method Summary

short	getExponent(byte[] buffer, short offset) Returns the private exponent value of the key in plain text.
short	getModulus(byte[] buffer, short offset) Returns the modulus value of the key in plain text.
void	setExponent(byte[] buffer, short offset, short length) Sets the private exponent value of the key.
void	setModulus(byte[] buffer, short offset, short length) Sets the modulus value of the key.

Methods inherited from interface javacard.security.Key

clearKey, getSize, getType, isInitialized

Method Detail

getModulus

public short getModulus(byte[] buffer,
                        short offset)

Returns the modulus value of the key in plain text. The data format is big-endian and right-aligned (the least significant bit is the least significant bit of last byte).

setExponent

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

Sets the private exponent value of the key. The plain text data format is big-endian and right-aligned (the least significant bit is the least significant bit of last byte). Input exponent 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 exponent value is decrypted using the Cipher object.

Throws:

CryptoException

getExponent

public short getExponent(byte[] buffer,
                         short offset)

Returns the private exponent value of the key in plain text. The data format is big-endian and right-aligned (the least significant bit is the least significant bit of last byte).

setModulus

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

Sets the modulus value of the key. The plain text data format is big-endian and right-aligned (the least significant bit is the least significant bit of last byte). Input modulus 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 modulus value is decrypted using the Cipher object.

Throws:

CryptoException